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Polymorphism of trans-1,4-Cyclohexanediol: Conformational Isomorphism

机译:反式1,4-环己二醇的多态性:构象同构

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In this work, an investigation on the polymorphism of trans-1,4-cyclohexanediol is performed. Polymorph screening is carried out by crystallization from solutions, by sublimation, and by cooling the melt, and a combined approach using differential scanning calorimetry, polarized light thermomicroscopy, and X-ray diffraction is employed in the results interpretation. Three solid forms, I, II, and III (Steiner et al.J. Chem. Soc., Perkin Trans. 2 1998, 371-377), are identified, I and II, for the first time, and their relative stability established. The crystal structure of polymorph 11 is resolved by single crystal X-ray diffraction: a monoclinic P2(1)/a space group Structure. This polymorph, as polymorph III (Steiner et al. J. Chem. Soc., Perkn Trans. 2 1998, 371-377), exhibits Unusual conformational isomorphism, that is, the coexistence of the biequatorial and the biaxial conformers in the same crystal structure.
机译:在这项工作中,对反式1,4-环己二醇的多态性进行了研究。多晶型物的筛选是通过从溶液中结晶,升华和冷却熔体来进行的,在结果解释中采用了使用差示扫描量热法,偏振光热显微镜和X射线衍射的组合方法。首次鉴定了三种固体形式I,II和III(Steiner等人,J.Chem.Soc。,Perkin Trans.2 1998,371-377),并确定了它们的相对稳定性。多晶型物11的晶体结构通过单晶X射线衍射解析:单斜晶P2(1)/空间群结构。这种多晶型物作为多晶型物III(Steiner et al.J.Chem.Soc。,Perkn Trans.2 1998,371-377),表现出异常的构象同构,即在同一个晶体中双正交和双轴构象异构体共存结构体。

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