Br···Br and Br···H Interactions in Action: Polymorphism, Hopping, and Twinning in 1,2,4,5-Tetrabromobenzene

doi:10.1021/CM991123P

Paper

Br···Br and Br···H Interactions in Action: Polymorphism, Hopping, and Twinning in 1,2,4,5-Tetrabromobenzene

Published Jan 22, 2000 · H. Lieberman, R. Davey, D. Newsham

Chemistry of Materials

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100

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Abstract

The nature and importance of nonbonded halogen−halogen and halogen−hydrogen interactions in molecular crystals continues to attract significant attention. Here, we report the manifestation of such interactions in the twinning and polymorphism of 1,2,4,5-tetrabromobenzene. A combination of molecular modeling and experimental studies using DSC, hot stage optical microscopy, and in situ powder X-ray diffraction is used to explore the mechanism of phase transition and understand the basis of twin formation in this material. The propensity to twin, the observed polymorphism, and the fact that crystals hop as they transform are all consequences of Br···Br and Br···H interactions.

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Study Snapshot

BrBr and BrH interactions in 1,2,4,5-tetrabromobenzene lead to twin formation, polymorphism, and crystal hopping during transformation, highlighting the importance of these interactions in molecular crystals.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

Br···Br and Br···H Interactions in Action: Polymorphism, Hopping, and Twinning in 1,2,4,5-Tetrabromobenzene

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