Motional heterogeneity and polymorphism of bisphenol-A diacetate

✍ Scribed by Daniele Casarini; Robin K. Harris; Alan M. Kenwright

• Book ID: 102951476
• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 653 KB
• Volume: 31
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.1260310605

✦ Synopsis

Abstract

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.