Polymorphism and phase transition behavior of 6,6'-bis(chloromethyl)-1,1',4,4'-tetramethyl-3,3'-(p-phenylenedimethylene)bis(piperazine-2,5-dione).
Polymorphism and phase transition behavior of 6,6'-bis(chloromethyl)-1,1',4,4'-tetramethyl-3,3'-(p-phenylenedimethylene)bis(piperazine-2,5-dione).
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6,6-双(氯甲基)-1,1,4,4-四甲基-3,3-(对亚苯基)双(哌嗪-2,5-二酮)的多晶型和相变行为。
DOI：
10.1107/s0108270109024457
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Olenyuk,Bogdan
中科院分区：
文献类型：
--
作者：
Polaske,NathanW;Nichol,GaryS;Olenyuk,Bogdan
A crystallographic investigation of the title compound, C22H28Cl2N4O4, using crystals obtained under different crystallization conditions, revealed the presence of two distinct polymorphic forms. The molecular conformation in the two polymorphs is very different: one adopts a `C' shape, whereas the other adopts an `S' shape. In the latter, the molecule lies across a crystallographic twofold axis. The `S'-shaped polymorph undergoes a reversible orthorhombic-to-monoclinic phase transition on cooling, whereas the structure of the `C'-shaped polymorph is temperature insensitive.
