层状杂合物(C_(12)H_(25)NH3)_2CoCl_4晶体相变的结构  

Structures of the phase transition in layered-type hybrid(C_(12)H_(25)NH_3)_2CoCl_4

作　　者：郭丽玲[1] 刘韩星[1] 

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,湖北武汉430070

出　　处：《华中科技大学学报（自然科学版）》2008年第9期98-101,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金重大资助项目(90206047);湖北省自然科学基金资助项目(2006ABA306)

摘　　要：用不同温度下的X射线衍射谱和红外谱对（C12H25NH3）2CoCl4晶体的相变结构进行了表征，结果显示：相变温度在98～145℃之间，且相变是可逆的；相变前后晶体都为层状结构，无机层在相变前后保持相对稳定，但有机链的构象发生了变化，即链中的C—C键发生了从全反式键到旁式键的变化，致使高温相层间距比低温相增大．根据实测得的高温相下层间距大小，认为该晶体高温相下有机链最可能的构象为全旁式构象．The structures of the phase transition in layered-type hybrid （Cl2H25NH3）2CoCl4 were investigated by X-ray diffraction （XRD） and infrared spectra at different temperatures. The results demonstrate that the phase transition occurred in a range of 98-145℃ and the transition is reversi- ble. The hybrid keeps a layered structure whenever it is in the high or the low temperature phase. When the phase transition occurs, the inorganic frames were relatively stable but the comformation of organic chains change. The C--C bonds change from all-trans into gauche ones and this results in the increasing of the interlayer distance. According to the interlayer distance data obtained from XRD, it is proposed that all-gauche conformation is the most probable conformation in high temperature phase.

关 键 词：有机-无机杂合物 量子阱 层状结构 层间距 相变 构象 

分 类 号：TB34[一般工业技术—材料科学与工程]