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dzychem

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±¾ÈËÓÐÁ½¸ö¾§Ì壬½âÎöÍêÁËÒÔºóflack²ÎÊý·Ö±ðÊÇ0.691(18)ºÍ0.50(2)£¬platon¼ì²â±¨¸æÓÐCÀàÌáʾ£¬·Ö±ðÊÇ£º
£¨1£©STRVA01_ALERT_4_C Flack test results are ambiguous.
       From the CIF: _refine_ls_abs_structure_Flack 0.691
       From the CIF: _refine_ls_abs_structure_Flack_su 0.018
£¨2£©STRVA01_ALERT_4_C Flack test results are ambiguous.
       From the CIF: _refine_ls_abs_structure_Flack 0.500
       From the CIF: _refine_ls_abs_structure_Flack_su 0.020

µ«Éó¸åÈËÌá³öÁËÈçÏÂÒâ¼û£º
In the Cc  non-centrosymmetric space group with heavy atom like Pb, one should
expect to be able to determine reliably the absolute structure, which is not the
case in this manuscript. In both structures, the value of the Flack parameter is
0.69 and 0.50 respectively with a rather large su. This large su is certainly
related to the merging of reflections in the 2/m point group which is incorrect.
The data should have been merged in the 2 point group.
In any case, the compounds are obviously twinned by inversion and this important
characteristic has been completely missed by the authors.

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clarkyze

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dzychem(½ð±Ò+1):лл£¡ 2010-06-13 17:37:21
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dzychem

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Originally posted by clarkyze at 2010-06-13 13:03:10:
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