摘要
用红外光谱和差示扫描量热法(DSC)研究了具有钙钛矿型层结构标题配合物的固-固相变。在340K处发现一个新的相变。实验证明了结构相变与烷基铵链动力学和氢键有关。在374K的主相变主要来源于烷基铵链构象的有序-无序变化,该变化可能与NH_3极性头的重定向运动偶合。在高温相在烷基铵链中产生了GTG+GTG’和GG以及临近端甲基的TG结构,因而形成了构象完全无序态。
The solid-solid phase transitions in the perovskite-type layer title compound have been studied by infrared spectroscopy and DSC method. The new phase transition at 340K was found. A temperature dependence study of the infrared spectra provides the evidence of occurence of structural phase transition related to the dynamics of the alkylammonium ions and hydrogen bonds. The transition at 374K corresponds to reofientational motions of the NH_3 polar heads. The GTG or GTG' and TG defects near CH_3 group appear in the high temperature disordered phase.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1992年第4期23-27,66,共6页
Spectroscopy and Spectral Analysis
关键词
红外光谱
相变
钴配合物
C16CO
Infrared spectroscopy Phase transition Order-disorder Molecular conformation Bis (n-hexadecylammonium) tetrachlorocolbate
