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yangdeliangÒø³æ (СÓÐÃûÆø)
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ÇóÖúActa EµÄÒ»¸öCÀà´íÎó
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Regarding voids in the structure, larger than 40 Ang**3, CheckCif explains: -------------------------------------------------------------------------------- PLAT601 Type_2 Test for (Unreported) solvent accessible voids -------------------------------------------------------------------------------- Crystal structures in general do not contain large solvent accessible voids in the lattice. Most structures lose their long-range ordering when solvent molecules leave the crystal. Only when the remaining network is strongly bonded (e.g. zeolites and some hydrogen bonded networks) the crystal structure may survive. Residual voids in a structure may indicate the omission of (disordered) density from the model. Disordered density may go undetected when smeared since peak search programs are not designed to locate maxima on density ridges. The presence or absence of residual density in the void may be verified on a printed/plotted difference Fourier map or with PLATON/SQUEEZE. Voids of 40 Ang**3 may accommodate H2O. Small molecules such as Tetrahydrofuran have typical volumes in the 100 to 200 Ang**3 range. This test reports the volume of the largest solvent accessible void in the structure. A paper reporting a crystal structure with a significant solvent accessible void should at the least discuss the issue. A CheckCif test in your structure detects "PLAT601_ALERT_2_C Structure Contains Solvent Accessible VOIDS of 78 A**3 " Please, discuss/explain. ÕâÊÇÎÒͶµÄActa EµÄÒ»¸öCÀà´íÎó£¬ÉÏÃæÊÇÉó¸åÈ˵ÄÎÊÌ⣬ÄÄλ¸ßÊÖÄܰïÎһشðһϠ|
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2Â¥2011-07-26 12:31:39
yangdeliang
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