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ÄÄλ¸ßÊÖ°ï°ï棬±à¼ÒªÇó¾«ÐÞ£¬¸Ð¼¤²»¾¡£¡ÏÂÃæÊÇÒâ¼û£º 165_ALERT_3_C Nr. of Status R Flagged Non-Hydrogen Atoms ..... 2 The two atoms concerned are the Cl-atoms of the solvent. You can see this in the CIF coordinates list. The problem is that apparently you forgot an AFIX 0 after the preceding H-atom, so the Cl atoms are riding on C3. WIth this included, the Cl-atoms moved a lot and R dropped to 0.067, so unfortunately the structure had not converged before the mistake occurred. So a correct refinement is required. A structure with an R-factor > 0.070 is not really acceptable unless there are special circumstances, which must be documented. There are no such remarks in exptl_refinement. However, examination of an ORTEP view and the CIF U's shows that the solvent atoms have hugely elongated ellipsoids, suggesting untreated disorder. In addition, the C-Cl distances are about 1.54, which is WAY too short, and the angle is quite large. The disorder should be modelled by splitting the positions of the Cl and C atoms to give two reverse orientations of the solvent molecule. Refinement of this model should give a much reduced R factor and lower residual electron density. An extinction correction might also be required. A test refinement like this gave R = 0.053 with residual electron density down to 0.26. No restraints were used, but the dimensions of the solvent were much better. ÄÄλ¸ßÊÖÁ˽âµÄÄÜÁô¸öÓÊÏä°ï¸ö棬лл£¡ |
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