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Crystallographic curiosities: polymorphism and structures with Z ′ > 1
Author(s) -
Clegg William
Publication year - 2019
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229619008799
Subject(s) - intermolecular force , polymorphism (computer science) , crystal structure , molecule , crystallography , physics , chemistry , quantum mechanics , allele , gene , biochemistry
Polymorphs often have different values of Z ′, the number of independent molecules in the asymmetric unit of the crystal structure. Structures with Z ′ > 1 are a small minority, particularly so for Z ′ > 2, and many are associated with packing problems, disorder and weak intermolecular interactions. These phenomena are fascinating and have important practical implications.