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Motional heterogeneity and polymorphism of bisphenol‐A diacetate
Author(s) -
Casarini Daniele,
Harris Robin K.,
Kenwright Alan M.
Publication year - 1993
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260310605
Subject(s) - chemistry , crystallography , molecule , magic angle spinning , diffraction , polymorphism (computer science) , phenylene , solid state nuclear magnetic resonance , powder diffraction , bisphenol , single crystal , nuclear magnetic resonance spectroscopy , stereochemistry , polymer , nuclear magnetic resonance , organic chemistry , optics , biochemistry , physics , epoxy , genotype , gene
Two polymorphs of bisphenol‐A diacetate [2,2‐bis(p‐acetoxyphenyl)propane] were characterized by solid‐state 13 C cross‐polarization magic‐angle spinning NMR, X‐ray powder diffraction and differential scanning calorimetic measurements. The structure of one polymorph was determined by single‐crystal x‐ray diffraction methods, and shown to have two molecules in the asymmetric unit. The two polymorphs show markedly different molecular mobilities, as reflected in variable‐temperature solid‐state NMR measurements, with one polymorph exhibiting motional heterogeneity in the flipping of the phenylene rings.