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