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hanbao

银虫 (小有名气)

[交流] 请教空间群导致“chiral inversion”的问题?

看到有文章讲到,有些空间群会导致“chiral inversion”,所以不适合含手性的晶体,请问是指这类空间群不适合手性分子的晶体吗,
谢谢!
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hanbao

银虫 (小有名气)

原话是这样的:“ For each of the space groups shown, the table also shows whether or not any of the space group operations of the symmetry group result in a chiral inversion of molecules containing a chiral center. If a crystalline powder is known to be enantiomerically pure, space groups generating a chiral inversion can be excluded in the search for structure solutions. However, if a crystalline powder is know to be a racemate, the search for structure solutions should be concentrated on space groups that generate chiral inversions. ”
表如下:
Space group Chiral Inversion Frequency
P21/c Yes 35.9%
P-1 Yes 13.7%
P212121 No 11.6%
P21 No 6.7%
C2/c Yes 6.6%
Pbca Yes 4.3%
Pnma Yes 1.9%
Pna21 Yes 1.8%
Pbcn Yes 1.2%
P1 No 1.0%
Cc Yes 0.9%
C2 No 0.9%
Pca21 Yes 0.8%
P21/m Yes 0.8%
C2/m Yes 0.6%
P21212 No 0.6%
P2/c Yes 0.5%
那么是指如果分子含有手性中心的话,可导致“chiral inversion”的那些空间群就可以不用去考虑吗。
2楼2008-05-23 13:16:32
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