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zcf200300木虫 (小有名气)
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[求助]
求助B类错误
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请教各位大侠,cif检查时出现此B类错误该怎样解决,因文章发表在即,望大侠们不吝赐教。 PLAT601_ALERT_2_B Structure Contains Solvent Accessible VOIDS of . 168 A**3 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. |
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