Polymorphism and phase transition behavior of 6,6'-bis(chloromethyl)-1,1',4,4'-tetramethyl-3,3'-(p-phenylenedimethylene)bis(piperazine-2,5-dione).
作者： Nathan W. Polaske , Gary S. Nichol , Bogdan Olenyuk
DOI: 10.1107/S0108270109024457
关键词:
摘要: A crystallographic investigation of the title compound, C22H28Cl2N4O4, using crystals obtained under different crystallization conditions, revealed presence two distinct polymorphic forms. The molecular conformation in polymorphs is very different: one adopts a `C' shape, whereas other an `S' shape. In latter, molecule lies across twofold axis. `S'-shaped polymorph undergoes reversible orthorhombic-to-monoclinic phase transition on cooling, structure `C'-shaped temperature insensitive.
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