Magnetic Resonance in Chemistry p. 540 - 547 (1993)
Update date:2022-08-11
Topics:
Casarini, Daniele
Harris, Robin K.
Kenwright, Alan M.
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 calorimetric 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.KEY WORDS: (13)C NMR; (13)C CP MAS; Motional heterogeneity; Polymorphism; Bisphenol-A diacetate
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