Crystal structure and phase transition of 2-methoxyanilinium perchlorate-18-crown-6  

作　　者：Wei-Qiang Liao Qin-Qin Zhou Peng-Fei Li Yi Zhang 

机构地区：[1]Ordered Matter Science Research Center,College of Chemistry and Chemical Engineering,Southeast University

出　　处：《Chinese Chemical Letters》2014年第5期723-726,共4页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 21101025)

摘　　要：A new phase transition compound,2-methoxyanilinium perchlorate-18-crown-6（1） {（oCH3OC6H4NH3）＋（18-crown-6） ClO4 },has been synthesized and separated as crystals.Differential scanning calorimetry（DSC） measurements show a pair of sharp peaks at 225 K（heating） and 210 K（cooling）,indicating the phase transition is first-order.Dielectric anomalies observed at 225 K（heating）and 210 K（cooling） further confirm the phase transition.The crystal structures determined at 298 K and123 K are both triclinic in P 1.The most distinct difference between room-temperature and lowtemperature structures is the order–disorder transition of the host 18-crown-6 molecule,which is the driving force of the phase transition.A new phase transition compound,2-methoxyanilinium perchlorate-18-crown-6（1） {（oCH3OC6H4NH3）＋（18-crown-6） ClO4 },has been synthesized and separated as crystals.Differential scanning calorimetry（DSC） measurements show a pair of sharp peaks at 225 K（heating） and 210 K（cooling）,indicating the phase transition is first-order.Dielectric anomalies observed at 225 K（heating）and 210 K（cooling） further confirm the phase transition.The crystal structures determined at 298 K and123 K are both triclinic in P 1.The most distinct difference between room-temperature and lowtemperature structures is the order–disorder transition of the host 18-crown-6 molecule,which is the driving force of the phase transition.

关 键 词：Phase transition Dielectric Crystal structure Host molecule 

分 类 号：O621.13[理学—有机化学]