Changeset 2386 for Tutorials/CFXraySingleCrystal
- Timestamp:
- Jul 28, 2016 2:17:19 PM (7 years ago)
- File:
-
- 1 edited
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Tutorials/CFXraySingleCrystal/CFSingleCrystal.htm
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</style> 139 912 <!--[if gte mso 10]> 913 <style> 914 /* Style Definitions */ 915 table.MsoNormalTable 916 {mso-style-name:"Table Normal"; 917 mso-tstyle-rowband-size:0; 918 mso-tstyle-colband-size:0; 919 mso-style-noshow:yes; 920 mso-style-priority:99; 921 mso-style-parent:""; 922 mso-padding-alt:0in 5.4pt 0in 5.4pt; 923 mso-para-margin:0in; 924 mso-para-margin-bottom:.0001pt; 925 mso-pagination:widow-orphan; 926 font-size:10.0pt; 927 font-family:"Calibri",sans-serif;} 928 </style> 929 <![endif]--><!--[if gte mso 9]><xml> 930 <o:shapedefaults v:ext="edit" spidmax="1026"/> 931 </xml><![endif]--><!--[if gte mso 9]><xml> 932 <o:shapelayout v:ext="edit"> 933 <o:idmap v:ext="edit" data="1"/> 934 </o:shapelayout></xml><![endif]--> 140 935 </head> 141 936 142 <body lang=EN-US >937 <body lang=EN-US style='tab-interval:.5in'> 143 938 144 939 <div class=WordSection1> 145 940 146 <h1> Single crystal structure determination and refinement with X-ray data in147 GSAS-II</h1>148 149 <h2> Introduction</h2>941 <h1><span style='mso-fareast-font-family:"Times New Roman"'>Single crystal 942 structure determination and refinement with X-ray data in GSAS-II<o:p></o:p></span></h1> 943 944 <h2><span style='mso-fareast-font-family:"Times New Roman"'>Introduction<o:p></o:p></span></h2> 150 945 151 946 <p class=MsoNormal>In this exercise we will use a set of X-ray single crystal 152 structure factors to solve the structure of dipyridyl disulfide by charge flipping 153 and then refine the structure by least-squares. The structure will be completed 154 by adding the requisite hydrogen atoms and by using anisotropic thermal 155 parameters for the heavier atoms. The structure was originally solved by 156 Raghavan & Seff, Acta Cryst. B33, 386-391 (1977) in the space group P2<sub>1</sub>/c 157 with one disordered pyridine ring with indications that the true space group 158 was P2<sub>1</sub>. It was subsequently reinvestigated by Young (2014 159 .) who 160 found that the true space group was P2<sub>1</sub> with 4 molecules in the 161 asymmetric unit. The data used in the latter analysis is what is used here and 162 is provided as a fcf file obtained after structure analysis by Shelx-97; the 163 structure factors are scaled to those calculated from the structure. We will 164 solve the P 2<sub>1</sub>/c structure first.</p> 947 structure factors to solve the structure of <span class=SpellE>dipyridyl</span> 948 disulfide by charge flipping and then refine the structure by least-squares. 949 The structure will be completed by adding the requisite hydrogen atoms and by 950 using anisotropic thermal parameters for the heavier atoms. The structure was 951 originally solved by <span class=SpellE>Raghavan</span> & <span 952 class=SpellE>Seff</span>, <span class=SpellE>Acta</span> <span class=SpellE>Cryst</span>. 953 B33, 386-391 (1977) in the space group P2<sub>1</sub>/c with one disordered 954 pyridine ring with indications that the true space group was P2<sub>1</sub>. It 955 was subsequently reinvestigated by Young (2014 956 .) who found that the true space 957 group was P2<sub>1</sub> with 4 molecules in the asymmetric unit. The data used 958 in the latter analysis is what is used here and is provided as a <span 959 class=SpellE>fcf</span> file obtained after structure analysis by Shelx-97; 960 the structure factors are scaled to those calculated from the structure. We 961 will solve the P 2<sub>1</sub>/c structure first.</p> 165 962 166 963 <p class=MsoNormal> </p> … … 173 970 already, start GSAS-II</p> 174 971 175 <h2>Step 1. Input phase information</h2> 176 177 <p class=MsoListParagraph style='text-indent:-.25in'>1.<span style='font:7.0pt "Times New Roman"'> 178 </span>Use the <b><span style='font-family:"Calibri",sans-serif'>Data/Add phase</span></b> 179 menu item add a new phase into the current GSAS-II project. A popup window will 180 appear asking for a phase name; I entered <b><span style='font-family:"Calibri",sans-serif'>SS 181 dipyridyl</span></b>; press <b><span style='font-family:"Calibri",sans-serif'>OK</span></b> 182 when done. Select <b><span style='font-family:"Calibri",sans-serif'>Loaded 183 Data/Phases/SS dipyridyl</span></b> from the GSAS-II Data tree window. The 972 <h2><span style='mso-fareast-font-family:"Times New Roman"'>Step 1. Input phase 973 information<o:p></o:p></span></h2> 974 975 <p class=MsoListParagraph style='text-indent:-.25in'>1.<span style='font-size: 976 7.0pt'> </span>Use the <b><span style='font-family: 977 "Calibri",sans-serif'>Data/Add phase</span></b> menu item add a new phase into 978 the current GSAS-II project. A popup window will appear asking for a phase 979 name; I entered <b><span style='font-family:"Calibri",sans-serif'>SS <span 980 class=SpellE>dipyridyl</span></span></b>; press <b><span style='font-family: 981 "Calibri",sans-serif'>OK</span></b> when done. Select <b><span 982 style='font-family:"Calibri",sans-serif'>Loaded Data/Phases/SS <span 983 class=SpellE>dipyridyl</span></span></b> from the GSAS-II Data tree window. The 184 984 General tab for Phase Data will appear.</p> 185 985 186 <p class=MsoListParagraph>< img width=524 height=307 id="Picture 1"187 src="CFSingleCrystal_files/image001.png"></p>188 189 <p class=MsoListParagraph style='text-indent:-.25in'>2.<span style='font :7.0pt "Times New Roman"'> 190 </span>Enter the space group <b><span style='font-family:"Calibri",sans-serif'>P 191 21/c</span></b> (dont forget the space between P & 21/c) & press <b><span 192 s tyle='font-family:"Calibri",sans-serif'>Enter</span></b>. A Space Group193 Information popup window will appear; press <b><span style='font-family:"Calibri",sans-serif'>OK</span></b>. 194 The General window will be refreshed showing only the needed lattice parameters 195 for P 21/c.</p>196 197 <p class=MsoListParagraph>< img width=522 height=361 id="Picture 3"198 src="CFSingleCrystal_files/image002.png"></p>199 200 <p class=MsoListParagraph style='text-indent:-.25in'>3.<span style='font :7.0pt "Times New Roman"'> 201 </span>Enter <b><span style='font-family:"Calibri",sans-serif'>15.8489</span></b>, 202 <b><span style='font-family:"Calibri",sans-serif'>5.5008</span></b>, <b><span 203 style='font-family:"Calibri",sans-serif'>23.118</span></b>, and <b><span986 <p class=MsoListParagraph><span style='mso-no-proof:yes'><img width=524 987 height=307 id="_x0000_i1042" src="CFSingleCrystal_files/image001.png"></span></p> 988 989 <p class=MsoListParagraph style='text-indent:-.25in'>2.<span style='font-size: 990 7.0pt'> </span>Enter the space group <b><span 991 style='font-family:"Calibri",sans-serif'>P 21/c</span></b> (dont forget the 992 space between P & 21/c) & press <b><span style='font-family:"Calibri",sans-serif'>Enter</span></b>. 993 A Space Group Information popup window will appear; press <b><span 994 style='font-family:"Calibri",sans-serif'>OK</span></b>. The General window will 995 be refreshed showing only the needed lattice parameters for P 21/c.</p> 996 997 <p class=MsoListParagraph><span style='mso-no-proof:yes'><img width=522 998 height=361 id="_x0000_i1041" src="CFSingleCrystal_files/image002.png"></span></p> 999 1000 <p class=MsoListParagraph style='text-indent:-.25in'>3.<span style='font-size: 1001 7.0pt'> </span>Enter <b><span style='font-family: 1002 "Calibri",sans-serif'>15.8489</span></b>, <b><span style='font-family:"Calibri",sans-serif'>5.5008</span></b>, 1003 <b><span style='font-family:"Calibri",sans-serif'>23.118</span></b>, and <b><span 204 1004 style='font-family:"Calibri",sans-serif'>96.9160</span></b> for a, b, c and 205 1005 beta, respectively; the unit cell volume will be recalculated at each entry.</p> 206 1006 207 <h2>Step 2. Import structure factors </h2> 1007 <h2><span style='mso-fareast-font-family:"Times New Roman"'>Step 2. Import 1008 structure factors <o:p></o:p></span></h2> 208 1009 209 1010 <p class=MsoNormal>There are two parts to this step: one is to import the data … … 212 1013 <p class=MsoNormal>To do these, do <b><span style='font-family:"Calibri",sans-serif'>Import/Structure 213 1014 factor/from CIF file</span></b> from the main GSAS-II data tree window menu. A 214 file selection dialog will appear; find <b><span style='font-family:"Calibri",sans-serif'>exercises\CF 215 Xray single crystal\S2dipyridyl.fcf</span></b> and press <b><span 216 style='font-family:"Calibri",sans-serif'>Open</span></b>. A popup window asking 217 if this is the file you want; press <b><span style='font-family:"Calibri",sans-serif'>Yes</span></b>. 218 After a pause while the file is read a new popup will appear offering the 219 chance to rename the structure factor set; press <b><span style='font-family: 220 "Calibri",sans-serif'>OK</span></b>. After some time a new popup will appear to 221 Add the new structure factor set to the SS dipyridyl phase. Select the phase 222 and press <b><span style='font-family:"Calibri",sans-serif'>OK</span></b>. The 223 plot will show a rectangular array of circles for the hk0 reflection layer; 1015 file selection dialog will appear; find <b><span style='font-family:"Calibri",sans-serif'>CF 1016 <span class=SpellE>Xray</span> single crystal\data\S2dipyridyl.fcf</span></b> 1017 and press <b><span style='font-family:"Calibri",sans-serif'>Open</span></b>. A 1018 popup window asking if this is the file you want; press <b><span 1019 style='font-family:"Calibri",sans-serif'>Yes</span></b>. After a pause while 1020 the file is read a new popup will appear offering the chance to rename the 1021 structure factor set; press <b><span style='font-family:"Calibri",sans-serif'>OK</span></b>. 1022 After some <span class=GramE>time</span> a new popup will appear to Add the new 1023 structure factor set to the SS <span class=SpellE>dipyridyl</span> phase. 1024 Select the phase and press <b><span style='font-family:"Calibri",sans-serif'>OK</span></b>. 1025 The plot will show a rectangular array of circles for the hk0 reflection layer; 224 1026 select the plot & press <b><span style='font-family:"Calibri",sans-serif'>k</span></b> 225 1027 to get an h0l layer.</p> 226 1028 227 <p class=MsoNormal><img width=480 height=412 id="Picture 2" 228 src="CFSingleCrystal_files/image003.png"></p> 229 230 <p class=MsoNormal>Because the fcf file has both observed and calculated 231 structure factors, the plot shows a small R value for the layer. The observed 232 structure factors are shown as blue rings, the calculated ones as green rings 233 and a small green or red dot may appear at each ring center showing F<sub>o</sub>-F<sub>c</sub>. 234 If the reflection data file had only observed structure factors then only blue 235 rings will be seen. You can explore the plot options in the <b><span 1029 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=480 height=412 1030 id="_x0000_i1040" src="CFSingleCrystal_files/image003.png"></span></p> 1031 1032 <p class=MsoNormal>Because the <span class=SpellE>fcf</span> file has both 1033 observed and calculated structure factors, the plot shows a small R value for 1034 the layer. The observed structure factors are shown as blue rings, the 1035 calculated ones as green rings and a small green or red dot may appear at each 1036 ring center showing <span class=SpellE>F<sub>o</sub></span>-F<sub>c</sub>. If 1037 the reflection data file had only observed structure <span class=GramE>factors</span> 1038 then only blue rings will be seen. You can explore the plot options in the <b><span 236 1039 style='font-family:"Calibri",sans-serif'>K</span></b> box in the plot toolbar.</p> 237 1040 238 <h2>Step 3. Setup for charge flipping</h2> 1041 <h2><span style='mso-fareast-font-family:"Times New Roman"'>Step 3. Setup for 1042 charge flipping<o:p></o:p></span></h2> 239 1043 240 1044 <p class=MsoNormal>To solve (again) this crystal structure we will use charge … … 242 1046 structure without consideration of space group symmetry. To do this it operates 243 1047 on the entire unit cell volume to a selected resolution (usually 0.5Å) using 244 fast fourier transform techniques. This requires a set of structure factors in245 an array of the same dimensions as the density array covering the unit cell 246 (i.e. a box bounded by ~0.5Å resolution). The space group symmetry is applied 247 to the observed structure factors to create a full sphere which is then zero 248 f illed out to the 0.5Å resolution bounded box. To be reasonably assured of249 success, the observed structure factors should extend to ~1Å resolution; we 250 have that here for this example. To begin select <b><span style='font-family: 251 "Calibri",sans-serif'>Phases/SS dipyridyl</span></b> from the GSAS-II data 252 tree; the General tab will be shown</p>253 254 <p class=MsoNormal>< img width=624 height=401 id="Picture 4"255 src="CFSingleCrystal_files/image004.png"></p>1048 fast <span class=SpellE>fourier</span> transform techniques. This requires a 1049 set of structure factors in an array of the same dimensions as the density 1050 array covering the unit cell (i.e. a box bounded by ~0.5Å resolution). The 1051 space group symmetry is applied to the observed structure factors to create a 1052 full sphere which is then zero filled out to the 0.5Å resolution bounded box. 1053 To be reasonably assured of success, the observed structure factors should 1054 extend to ~1Å resolution; we have that here for this example. To begin select <b><span 1055 style='font-family:"Calibri",sans-serif'>Phases/SS <span class=SpellE>dipyridyl</span></span></b> 1056 from the GSAS-II data tree; the General tab will be shown</p> 1057 1058 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=624 height=401 1059 id="_x0000_i1039" src="CFSingleCrystal_files/image004.png"></span></p> 256 1060 257 1061 <p class=MsoNormal>Find the <b><span style='font-family:"Calibri",sans-serif'>Fourier … … 265 1069 data sets for this phase, you can pick more than one and GSAS-II will use a 266 1070 last one in process for assembling the reflection set to use for charge 267 flipping. There are four more settings to consider: 1) kMax controls the upper 268 cutoff for charge flipping; if the density is > k-Max*<span 269 style='font-family:Symbol'>s</span><sub><span style='font-family:Symbol'>r</span></sub> 270 (map standard deviation) then flip the charge. This prevents the Uranium 271 solution sometimes found where all the density is concentrated in a single 272 peak. A useful guide is to use twice the largest atomic number of any element 273 in your structure. For equal atom problems use 12-15; adjust upward for 274 structures with heavy & light atoms. In this case, set <b><span 275 style='font-family:"Calibri",sans-serif'>k-Max</span></b> to <b><span 276 style='font-family:"Calibri",sans-serif'>30.0</span></b> to allow the S atom to 277 appear. 2) k-Factor controls the lower level for charge flipping; if the 278 density is < k-Factor*<span style='font-family:Symbol'>s</span><sub><span 279 style='font-family:Symbol'>r</span></sub> then flip the charge. The default 280 value seems to work pretty well; Id only change it if the charge flipping is 281 having trouble solving the structure. 3) Resolution selects the spacing between 282 map points. 0.5Å is sufficient in most cases. Choosing a smaller value requires 283 more map points (NB: GSAS-II uses the entire unit cell volume for charge 284 flipping) and thus will require more structure factors since the fast fourier 285 algorithm requires the same size arrays in both real space and reciprocal 286 space. This will slow down the charge flip process. 4) Normalizing element 287 selects a form factor to rescale the structure factors thus sharpening the 288 density map. I suggest trying <b><span style='font-family:"Calibri",sans-serif'>None</span></b> 1071 flipping. There are four more settings to consider: 1) <span class=SpellE>kMax</span> 1072 controls the upper cutoff for charge flipping; if the density is > k-Max*<span 1073 style='font-family:Symbol'>s<sub>r</sub></span> (map standard deviation) then 1074 flip the charge. This prevents the Uranium solution sometimes found where all 1075 the density is concentrated in a single peak. A useful guide is to use twice 1076 the largest atomic number of any element in your structure. For equal atom 1077 problems use 12-15; adjust upward for structures with heavy & light atoms. 1078 In this case, set <b><span style='font-family:"Calibri",sans-serif'>k-Max</span></b> 1079 to <b><span style='font-family:"Calibri",sans-serif'>30.0</span></b> to allow 1080 the S atom to appear. 2) k-Factor controls the lower level for charge flipping; 1081 if the density is < k-Factor*<span style='font-family:Symbol'>s<sub>r</sub></span> 1082 then flip the charge. The default value seems to work pretty well; Id only 1083 change it if the charge flipping is having trouble solving the structure. 3) 1084 Resolution selects the spacing between map points. 0.5Å is sufficient in most 1085 cases. Choosing a smaller value requires more map points (NB: GSAS-II uses the 1086 entire unit cell volume for charge flipping) and thus will require more 1087 structure factors since the fast <span class=SpellE>fourier</span> algorithm 1088 requires the same size arrays in both real space and reciprocal space. This 1089 will slow down the charge flip process. 4) Normalizing element selects a form 1090 factor to rescale the structure factors thus sharpening the density map. I 1091 suggest trying <b><span style='font-family:"Calibri",sans-serif'>None</span></b> 289 1092 first, otherwise select a representative element (really doesnt matter which).</p> 290 1093 291 <h2 style='page-break-after:avoid'>Step 4. Charge flipping</h2> 1094 <h2 style='page-break-after:avoid'><span style='mso-fareast-font-family:"Times New Roman"'>Step 1095 4. Charge flipping<o:p></o:p></span></h2> 292 1096 293 1097 <p class=MsoNormal>With the controls all set you can now do charge flipping; … … 295 1099 tab do <b><span style='font-family:"Calibri",sans-serif'>Compute/Charge 296 1100 flipping</span></b>. A progress bar popup will appear showing the residual 297 between the observed structure factors and those obtained from the inverse 298 fourier transform of the last flipped density map. It should quickly decrease 299 to the ~20% range and level out indicating a good charge flip solution. When it 300 has reached this, press <b><span style='font-family:"Calibri",sans-serif'>Cancel</span></b> 301 to stop the process.</p>302 303 <p class=MsoNormal>< img width=366 height=180 id="Picture 6"304 src="CFSingleCrystal_files/image005.png"></p>1101 between the observed structure factors and those obtained from the inverse <span 1102 class=SpellE>fourier</span> transform of the last flipped density map. It 1103 should quickly decrease to the ~20% range and level out indicating a good 1104 charge flip solution. When it has reached this, press <b><span 1105 style='font-family:"Calibri",sans-serif'>Cancel</span></b> to stop the process.</p> 1106 1107 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=366 height=180 1108 id="_x0000_i1038" src="CFSingleCrystal_files/image005.png"></span></p> 305 1109 306 1110 <p class=MsoNormal>The console window will show something like</p> 307 1111 308 <p class=MsoNormal>< img width=624 height=166 id="Picture 7"309 src="CFSingleCrystal_files/image006.png"></p>1112 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=624 height=166 1113 id="_x0000_i1037" src="CFSingleCrystal_files/image006.png"></span></p> 310 1114 311 1115 <p class=MsoNormal>There may be a pause at <b><span style='font-family:"Calibri",sans-serif'>Begin 312 fourier map search</span></b> before it finishes. Provided is a summary of the 313 charge flip calculation (time, map size, density range & structure factor 314 residual). The map offset is discovered by an analysis of the reflection phases 315 with respect to how they should be distributed for your chosen space group. 316 These offsets are then applied to shift the map so that the symmetry elements 317 are properly located in the unit cell. The quality of this fit (chi**2) is 318 given. This process is not necessarily perfect; you are given an opportunity to 319 hand-tune the offset. Finally the number of peaks found in the map is listed, 320 the structure is drawn (Ive made the view down the b-axis)</p> 321 322 <p class=MsoNormal><img width=478 height=402 id="Picture 11" 323 src="CFSingleCrystal_files/image007.jpg"></p> 324 325 <p class=MsoNormal> and the Phase data window will show the map peaks tab</p> 326 327 <p class=MsoNormal><img width=500 height=300 id="Picture 12" 328 src="CFSingleCrystal_files/image008.png"></p> 1116 <span class=SpellE>fourier</span> map search</span></b> before it finishes. 1117 Provided is a summary of the charge flip calculation (time, map size, density 1118 range & structure factor residual). The map offset is discovered by an 1119 analysis of the reflection phases with respect to how they should be 1120 distributed for your chosen space group. These offsets are then applied to 1121 shift the map so that the symmetry elements are properly located in the unit 1122 cell. The quality of this fit (chi**2) is given. This process is not 1123 necessarily perfect; you are given an opportunity to hand-tune the offset. <span 1124 class=GramE>Finally</span> the number of peaks found in the map is listed, the 1125 structure is drawn (Ive made the view down the b-axis)</p> 1126 1127 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=478 height=402 1128 id="_x0000_i1036" src="CFSingleCrystal_files/image007.jpg"></span></p> 1129 1130 <p class=MsoNormal> and the Phase data window will show the map peaks tab</p> 1131 1132 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=500 height=300 1133 id="_x0000_i1035" src="CFSingleCrystal_files/image008.png"></span></p> 329 1134 330 1135 <p class=MsoNormal>These are listed in order of magnitude; a double click on 331 1136 any of the table headings will sort the list according to that parameter. My 332 list has 112 entries; dipyridyl disulfide has 14 C & S atoms so this list333 is appropriate for 8 molecules in the unit cell and thus all atoms were found334 in this charge flipping result.</p>1137 list has 112 entries; <span class=SpellE>dipyridyl</span> disulfide has 14 C 1138 & S atoms so this list is appropriate for 8 molecules in the unit cell and 1139 thus all atoms were found in this charge flipping result.</p> 335 1140 336 1141 <p class=MsoNormal>If all went well then the drawing should nicely show all the … … 371 1176 style='font-family:"Calibri",sans-serif'>Compute/Search map</span></b>.</p> 372 1177 373 <h2>Step 5. Extract solution and make molecules</h2> 1178 <h2><span style='mso-fareast-font-family:"Times New Roman"'>Step 5. Extract 1179 solution and make molecules<o:p></o:p></span></h2> 374 1180 375 1181 <p class=MsoNormal>Assuming that the map & peak positions are properly … … 387 1193 according to their position in the magnitude column.</p> 388 1194 389 <p class=MsoNormal>< img width=624 height=267 id="Picture 13"390 src="CFSingleCrystal_files/image009.png"></p>1195 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=624 height=267 1196 id="_x0000_i1034" src="CFSingleCrystal_files/image009.png"></span></p> 391 1197 392 1198 <p class=MsoNormal>The drawing will show white balls at the atom positions 393 1199 scattered over several molecules.</p> 394 1200 395 <p class=MsoNormal>< img width=474 height=409 id="Picture 14"396 src="CFSingleCrystal_files/image010.jpg"></p>1201 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=474 height=409 1202 id="_x0000_i1033" src="CFSingleCrystal_files/image010.jpg"></span></p> 397 1203 398 1204 <p class=MsoNormal>Notice that 4 atoms have magnitudes ~90+, these are the S … … 404 1210 style='font-family:"Calibri",sans-serif'>OK</span></b>; a Periodic Table will 405 1211 appear. Select <b><span style='font-family:"Calibri",sans-serif'>S</span></b>; 406 the atoms will be renames and their Type changed to S. Next select the407 remaining H atoms (a quick way it to double LB click the <b><span1212 the atoms will be <span class=GramE>renames</span> and their Type changed to S. 1213 Next select the remaining H atoms (a quick way it to double LB click the <b><span 408 1214 style='font-family:"Calibri",sans-serif'>Type</span></b> column heading and 409 1215 select <b><span style='font-family:"Calibri",sans-serif'>H</span></b> from the … … 414 1220 change (you may have to wiggle it a bit to force the update).</p> 415 1221 416 <p class=MsoNormal>< img width=480 height=390 id="Picture 17"417 src="CFSingleCrystal_files/image011.jpg"></p>1222 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=480 height=390 1223 id="_x0000_i1032" src="CFSingleCrystal_files/image011.jpg"></span></p> 418 1224 419 1225 <p class=MsoNormal>Notice that the atoms are scattered over several molecules; … … 428 1234 bonds are found.</p> 429 1235 430 <p class=MsoNormal>< img width=265 height=223 id="Picture 16"431 src="CFSingleCrystal_files/image012.png"></p>1236 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=265 height=223 1237 id="_x0000_i1031" src="CFSingleCrystal_files/image012.png"></span> </p> 432 1238 433 1239 <p class=MsoNormal>Press <b><span style='font-family:"Calibri",sans-serif'>OK</span></b>; 434 atoms will be collected into a well positioned group, but others are not. Next 435 select one of the unassembled atoms (I chose a C-atom in a nearby SS-dipyridyl) 436 and do <b><span style='font-family:"Calibri",sans-serif'>Edit/Assemble molecule</span></b>; 437 there will be two nicely assembled SS-dipyridyls.</p> 438 439 <p class=MsoNormal><img width=480 height=384 id="Picture 5" 440 src="CFSingleCrystal_files/image013.jpg"></p> 1240 atoms will be collected into a <span class=SpellE>well positioned</span> group, 1241 but others are not. Next select one of the unassembled atoms (I chose a C-atom 1242 in a nearby SS-<span class=SpellE>dipyridyl</span>) and do <b><span 1243 style='font-family:"Calibri",sans-serif'>Edit/Assemble molecule</span></b>; 1244 there will be two nicely assembled SS-<span class=SpellE>dipyridyls</span>.</p> 1245 1246 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=480 height=384 1247 id="_x0000_i1030" src="CFSingleCrystal_files/image013.jpg"></span></p> 441 1248 442 1249 <p class=MsoNormal>You should probably save this project as it contains your 443 1250 solved crystal structure.</p> 444 1251 445 <h2>Step 6. Initial refinement</h2> 1252 <h2><span style='mso-fareast-font-family:"Times New Roman"'>Step 6. Initial 1253 refinement<o:p></o:p></span></h2> 446 1254 447 1255 <p class=MsoNormal>Since we now have a structural model, we can do the initial 448 structure refinement. By default this will only refine the scale factor; do <b><span449 style='font-family:"Calibri",sans-serif'>Calculate/Refine</span></b> from the 450 main GSAS-II data tree window. Convergence will quickly occur with Rw ~35%. 451 More useful is to refine the atom positions and isotropic thermal parameters. 452 Select the <b><span style='font-family:"Calibri",sans-serif'>Atoms</span></b>1256 structure refinement. By <span class=GramE>default</span> this will only refine 1257 the scale factor; do <b><span style='font-family:"Calibri",sans-serif'>Calculate/Refine</span></b> 1258 from the main GSAS-II data tree window. Convergence will quickly occur with <span 1259 class=SpellE>Rw</span> ~35%. More useful is to refine the atom positions and 1260 isotropic thermal parameters. Select the <b><span style='font-family:"Calibri",sans-serif'>Atoms</span></b> 453 1261 tab from the Phase window. Then LB double click the <b><span style='font-family: 454 1262 "Calibri",sans-serif'>refine</span></b> column heading; a popup window will … … 459 1267 style='font-family:"Calibri",sans-serif'>XU</span></b> for each atom in the 460 1268 refine column. Then do <b><span style='font-family:"Calibri",sans-serif'>Calculate/Refine</span></b> 461 (twice to get convergence) and the Rw ~12%.</p> 462 463 <h2>Step 7. Determine C/N choice</h2> 1269 (twice to get convergence) and the <span class=SpellE>Rw</span> ~12%.</p> 1270 1271 <h2><span style='mso-fareast-font-family:"Times New Roman"'>Step 7. Determine 1272 C/N choice<o:p></o:p></span></h2> 464 1273 465 1274 <p class=MsoNormal>We know from the chemistry that the N atom is in the 2 466 position of the pyridine ring, i.e. next to the point of attachment to the S-atom.467 However, we dont know which one that is and we have 8 atoms of which 4 are C 468 a nd 4 are N.</p>1275 position of the pyridine ring, i.e. next to the point of attachment to the 1276 S-atom. However, we dont know which one that is and we have 8 atoms of which 4 1277 are C and 4 are N.</p> 469 1278 470 1279 <p class=MsoNormal>To work out the C/N problem above we need the atoms to be in … … 487 1296 <p class=MsoNormal> </p> 488 1297 489 <p class=MsoNormal>< img width=474 height=386 id="Picture 9"490 src="CFSingleCrystal_files/image014.jpg"></p>1298 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=474 height=386 1299 id="_x0000_i1029" src="CFSingleCrystal_files/image014.jpg"></span></p> 491 1300 492 1301 <p class=MsoNormal>Now go to the <b><span style='font-family:"Calibri",sans-serif'>Atoms</span></b> 493 tab. If you look carefully, you can see that the atoms in each SS-dipyridyl are 494 grouped together in the table but they are not in chemically sensible order. 495 The atoms can be reordered by selecting one row with the <b><span 496 style='font-family:"Calibri",sans-serif'>Alt</span></b> key down (the status 497 line will tell which atom is selected to move) and then with the <b><span 498 style='font-family:"Calibri",sans-serif'>Alt</span></b> key still down pick a 499 row below where you want to insert it. I ordered them so each S-atom was 500 followed by the C-atoms in order around the ring; my list looked like (I show 501 just the 1<sup>st</sup> SS dipyridyl molecule)</p> 502 503 <p class=MsoNormal><img width=624 height=408 id="Picture 10" 504 src="CFSingleCrystal_files/image015.png"></p> 1302 tab. If you look carefully, you can see that the atoms in each SS-<span 1303 class=SpellE>dipyridyl</span> are grouped together in the table but they are 1304 not in chemically sensible order. The atoms can be reordered by selecting one 1305 row with the <b><span style='font-family:"Calibri",sans-serif'>Alt</span></b> 1306 key down (the status line will tell which atom is selected to move) and then 1307 with the <b><span style='font-family:"Calibri",sans-serif'>Alt</span></b> key 1308 still down pick a row below where you want to insert it. I ordered them so each 1309 S-atom was followed by the C-atoms in order around the ring; my list looked 1310 like (I show just the 1<sup>st</sup> SS <span class=SpellE>dipyridyl</span> 1311 molecule)</p> 1312 1313 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=624 height=408 1314 id="_x0000_i1028" src="CFSingleCrystal_files/image015.png"></span></p> 505 1315 506 1316 <p class=MsoNormal>Once you have reordered the atoms to your satisfaction they … … 518 1328 <b><span style='font-family:"Calibri",sans-serif'>X</span></b> & <b><span 519 1329 style='font-family:"Calibri",sans-serif'>U</span></b> for these. Do <b><span 520 style='font-family:"Calibri",sans-serif'>Calculate/Refine</span></b>; the Rw 521 will drop to ~10% and 4 of the atom <b><span style='font-family:"Calibri",sans-serif'>frac</span></b> 522 values will be ~1.25 while the others are ~1.0. The former are N-atoms and the 523 latter are C-atoms. Change the <b><span style='font-family:"Calibri",sans-serif'>Type</span></b> 1330 style='font-family:"Calibri",sans-serif'>Calculate/Refine</span></b>; the <span 1331 class=SpellE>Rw</span> will drop to ~10% and 4 of the atom <span class=SpellE><b><span 1332 style='font-family:"Calibri",sans-serif'>frac</span></b></span> values will be 1333 ~1.25 while the others are ~1.0. The former are N-atoms and the latter are 1334 C-atoms. Change the <b><span style='font-family:"Calibri",sans-serif'>Type</span></b> 524 1335 for the N-atoms and repeat <b><span style='font-family:"Calibri",sans-serif'>Calculate/Refine</span></b>; 525 the Rw will be high to start, but immediately fall to ~10%. In the Atom table 526 all 8 refined frac values are be now ~1.0. To finish this part of the 527 refinement, set all <b><span style='font-family:"Calibri",sans-serif'>frac</span></b> 528 values to <b><span style='font-family:"Calibri",sans-serif'>1.0</span></b> and 529 all refine flags to <b><span style='font-family:"Calibri",sans-serif'>XU</span></b>. 530 Do <b><span style='font-family:"Calibri",sans-serif'>Calculate/Refine</span></b>; 531 the final Rw ~10.5%</p> 532 533 <h2>Step 8. Anisotropic thermal motion refinement</h2> 1336 the <span class=SpellE>Rw</span> will be high to start, but immediately fall to 1337 ~10%. In the Atom table all 8 refined <span class=SpellE>frac</span> values are 1338 be now ~1.0. To finish this part of the refinement, set all <span class=SpellE><b><span 1339 style='font-family:"Calibri",sans-serif'>frac</span></b></span> values to <b><span 1340 style='font-family:"Calibri",sans-serif'>1.0</span></b> and all refine flags to 1341 <b><span style='font-family:"Calibri",sans-serif'>XU</span></b>. Do <b><span 1342 style='font-family:"Calibri",sans-serif'>Calculate/Refine</span></b>; the final 1343 <span class=SpellE>Rw</span> ~10.5%</p> 1344 1345 <h2><span style='mso-fareast-font-family:"Times New Roman"'>Step 8. Anisotropic 1346 thermal motion refinement<o:p></o:p></span></h2> 534 1347 535 1348 <p class=MsoNormal>Given reasonable measured structure factors one can improve 536 a crystal model by using anisotropic thermal motion models for all the 537 nonhydrogen atoms. To convert all the atoms here select the Atoms tab and then 538 do a double LB click on the I/A column heading. Select Anisotropic from the 539 popup and press OK; the Atom table will be redrawn with Uij values equivalent 540 to the corresponding Uiso (now hidden). Do <b><span style='font-family:"Calibri",sans-serif'>Calculate/Refine</span></b>; 541 the final Rw ~8.2%</p> 542 543 <h2 style='page-break-after:avoid'>Step 9. H-atom placement & final 544 refinement</h2> 545 546 <p class=MsoNormal>This structure can be completed by adding the 4 H-atoms per 547 pyridine ring (16 in all). One could do this (painfully) by hand by looking for 548 them in <span style='font-family:Symbol'>D</span>F maps, but it is simpler to just 549 place them knowing the bonding chemistry of the rings. To start this select the 550 <b><span style='font-family:"Calibri",sans-serif'>Atoms</span></b> tab for the 551 phase. Then select the C-atoms by a double LB click on the <b><span 1349 a crystal model by using anisotropic thermal motion models for all the <span 1350 class=SpellE>nonhydrogen</span> atoms. To convert all the atoms here select the 1351 Atoms tab and then do a double LB click on the I/A column heading. Select 1352 Anisotropic from the popup and press OK; the Atom table will be redrawn with <span 1353 class=SpellE>Uij</span> values equivalent to the corresponding <span 1354 class=SpellE>Uiso</span> (now hidden). Do <b><span style='font-family:"Calibri",sans-serif'>Calculate/Refine</span></b>; 1355 the final <span class=SpellE>Rw</span> ~8.2%</p> 1356 1357 <h2 style='page-break-after:avoid'><span style='mso-fareast-font-family:"Times New Roman"'>Step 1358 9. H-atom placement & final refinement<o:p></o:p></span></h2> 1359 1360 <p class=MsoNormal>This structure can be completed by adding the 4 H-atoms per pyridine 1361 ring (16 in all). One could do this (painfully) by hand by looking for them in <span 1362 style='font-family:Symbol'>D</span>F maps, but it is simpler to just place them 1363 knowing the bonding chemistry of the rings. To start <span class=GramE>this</span> 1364 select the <b><span style='font-family:"Calibri",sans-serif'>Atoms</span></b> 1365 tab for the phase. Then select the C-atoms by a double LB click on the <b><span 552 1366 style='font-family:"Calibri",sans-serif'>Type</span></b> column heading and 553 1367 select <b><span style='font-family:"Calibri",sans-serif'>C</span></b> from the … … 559 1373 popup will appear</p> 560 1374 561 <p class=MsoNormal>< img width=400 height=485 id="Picture 8"562 src="CFSingleCrystal_files/image016.png"></p>1375 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=400 height=485 1376 id="_x0000_i1027" src="CFSingleCrystal_files/image016.png"></span></p> 563 1377 564 1378 <p class=MsoNormal>This is the hydrogen add control; it shows both the expected … … 566 1380 determine the geometry of the C-H bond. Check to make sure that 4 H-atoms will 567 1381 be added for each ring. Note that C2, C9, C16 & C23 will not have an H-atom 568 added as these are the S-atom attachment points in SS- dipyridyl. Press <b><span569 style='font-family:"Calibri",sans-serif'>Ok</span></b>; the H-atoms will be570 inserted immediately after the corresponding C-atoms and the drawing is updated 571 showing van der Waals spheres for all atoms.</p>572 573 <p class=MsoNormal>< img width=624 height=396 id="Picture 15"574 src="CFSingleCrystal_files/image017.png"></p>1382 added as these are the S-atom attachment points in SS-<span class=SpellE>dipyridyl</span>. 1383 Press <b><span style='font-family:"Calibri",sans-serif'>Ok</span></b>; the 1384 H-atoms will be inserted immediately after the corresponding C-atoms and the 1385 drawing is updated showing van der Waals spheres for all atoms.</p> 1386 1387 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=624 height=396 1388 id="_x0000_i1026" src="CFSingleCrystal_files/image017.png"></span></p> 575 1389 576 1390 <p class=MsoNormal> </p> 577 1391 578 <p class=MsoNormal>< img width=483 height=394 id="Picture 18"579 src="CFSingleCrystal_files/image018.jpg"></p>1392 <p class=MsoNormal><span style='mso-no-proof:yes'><img width=483 height=394 1393 id="_x0000_i1025" src="CFSingleCrystal_files/image018.jpg"></span></p> 580 1394 581 1395 <p class=MsoNormal>Next, do <b><span style='font-family:"Calibri",sans-serif'>Calculate/Refine</span></b>; 582 there will be an immediate drop in Rw ~3.2%. Note that we did not refine the 583 H-atom positions or thermal parameters. The H-atom insertion process retains 584 the mechanisms for creating them in the first place and these tools can be used 585 to move them to reflect the changes in the C-atom parameters thus forcing them 586 to ride on the C-atoms. Do <b><span style='font-family:"Calibri",sans-serif'>Edit/Update 587 H atoms</span></b>; the H-atom positions & Uisos will be revised. Repeat <b><span 1396 there will be an immediate drop in <span class=SpellE>Rw</span> ~3.2%. Note 1397 that we did not refine the H-atom positions or thermal parameters. The H-atom 1398 insertion process retains the mechanisms for creating them in the first place 1399 and these tools can be used to move them to reflect the changes in the C-atom 1400 parameters thus forcing them to ride on the C-atoms. Do <b><span 1401 style='font-family:"Calibri",sans-serif'>Edit/Update H atoms</span></b>; the 1402 H-atom positions & <span class=SpellE>Uisos</span> will be revised. Repeat <b><span 588 1403 style='font-family:"Calibri",sans-serif'>Calculate/Refine</span></b>; there 589 will be a slight improvement in Rw. Repeat these two steps (twice); Rw should 590 not change on the last round. This completes the refinement of the SS-dipyridyl 1404 will be a slight improvement in <span class=SpellE>Rw</span>. Repeat these two 1405 steps (twice); <span class=SpellE>Rw</span> should not change on the last 1406 round. This completes the refinement of the SS-<span class=SpellE>dipyridyl</span> 591 1407 structure. You can generate a final <span style='font-family:Symbol'>D</span>F 592 1408 map from the <b><span style='font-family:"Calibri",sans-serif'>General</span></b>
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