Discovery of a new polymorphic phase of ortho-bromobenzophenone

Abstract We present the first experimental spectroscopy and calorimetry proof of the existence of polymorphism in ortho-bromobenzophenone (2BrBP). The crystallization and melting processes of the two polymorphic phases were monitored by infrared spectroscopy. The crystallization of the metastable phase occurs in the supercooled region at 245 K upon heating of the glassy 2BrBP. The metastable phase melts below the stable phase, i.e. at 301.0 K. After melting of the metastable phase it is transformed into a stable phase at room temperature. The stable polymorph melts at 316.5 K.