Crystal Structure, Thermal Decomposition Behavior, and Order-Disorder Transition of the Guest Component of Concomitant Pseudodimorphic Clathrates between 2,2'-Bis(9-hydroxy-9-fluorenyl)biphenyl Host and Chloroform Guest

Omay Sumarna; Jurgen Seidel; Edwin Weber; Wilhelm Seichter; Bakhtiyar T. Ibragimov; Kayrat M. Beketov

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Crystal Structure, Thermal Decomposition Behavior, and Order-Disorder Transition of the Guest Component of Concomitant Pseudodimorphic Clathrates between 2,2'-Bis(9-hydroxy-9-fluorenyl)biphenyl Host and Chloroform Guest

机译：2,2'-双（9-羟基-9-芴基）联苯主体和氯仿客体之间伴随的伪双晶包合物的客体组分的晶体结构，热分解行为和有序无序跃迁

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Two clathrates between the 2,2'-bis(9-hydroxy-9-fluorenyl)biphenyl host and chloroform guest, having 1:2 (α-phase) and 1:1 (β-phase) stoichiometries, have been obtained in the same vial by fast evaporation of a supersaturated solution in chloroform. The structures of the pseudodimorphs were determined by single-crystal X-ray diffraction. Their thermal properties were studied by using combined thermogravimetry-differential scanning calorimetry (TG-DSC), variable temperature X-ray powder diffraction in the temperature interval 20-250 ℃, and DSC in the low-temperature interval from -140 to 20 ℃. The thermal decomposition behavior of the α- and β-phase pseudodimorphs, a difference in the desolvation onset temperatures, as well as an occurrence of endothermic peaks in the low-temperature DSC curves (order-disorder transition of the guest component) have been explained on the basis of the structural data.

机译：在2,2'-双（9-羟基-9-芴基）联苯主体和氯仿客体之间获得了两个包合物，它们的化学计量比为1：2（α相）和1：1（β相）。通过快速蒸发氯仿中的过饱和溶液来获得相同的样品瓶。伪双晶的结构通过单晶X射线衍射确定。通过热重-差示扫描量热法（TG-DSC），20-250℃温度区间的变温X射线粉末衍射和-140-20℃低温区间的DSC，研究了它们的热性能。已解释了α相和β相伪双晶的热分解行为，去溶剂化温度的差异以及低温DSC曲线中吸热峰的出现（客体组分的有序无序转变）根据结构数据。

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《Crystal growth & design》 |2003年第4期|共6页
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Omay Sumarna; Jurgen Seidel; Edwin Weber; Wilhelm Seichter; Bakhtiyar T. Ibragimov; Kayrat M. Beketov;
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Crystal Structure, Thermal Decomposition Behavior, and Order-Disorder Transition of the Guest Component of Concomitant Pseudodimorphic Clathrates between 2,2'-Bis(9-hydroxy-9-fluorenyl)biphenyl Host and Chloroform Guest

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