标题:Phase Transition Originating from Order-Disorder Transformations of Carboxy Oxygen Atoms Coupled with Dynamic Proton Motions in [PhCH2NH(CH3)(2)](2)C2O4 center dot H2C2O4
作者:Tang, Yuanyuan; Ji, Chengmin; Sun, Zhihua; Zhang, Shuquan; Chen, Tianliang; Luo, Junhua
作者机构:[Tang, Yuanyuan; Luo, Junhua] Fuzhou Univ, Coll Chem & Chem Engn, Fuzhou 350108, Peoples R China.; [Tang, Yuanyuan; Ji, Chengmin; Sun, Zhihua; Zhang 更多
通讯作者:Luo, J
通讯作者地址:[Luo, JH]Fuzhou Univ, Coll Chem & Chem Engn, Fuzhou 350108, Peoples R China.
来源:CHEMISTRY-AN ASIAN JOURNAL
出版年:2014
卷:9
期:7
页码:1771-1776
DOI:10.1002/asia.201402132
关键词:crystal growth; isotope effects; order-disorder; oxalic acid; phase; transitions
摘要:A new molecular phase transition material, [PhCH2NH(CH3)(2)](2)C2O4 center dot H2C2O4, which undergoes a reversible phase transition at 151.6 K, has been successfully synthesized. Differential scanning calorimetry (DSC), specific heat capacity, and dielectric measurements confirm its reversible phase transition with a large thermal hysteresis of 15.1 K, demonstrating that the phase transition is typical first order. Variable-temperature single-crystal X-ray diffraction analyses reveal that the order-disorder transformations of carboxy oxygen atoms induce the structural phase transition. A slight reorientation of the oxalic acid unit is discovered to accompany the ordering of carboxy oxygen atoms at low temperature. The DSC measurement result of the deuterated analog is different to that of 1, indicating that proton dynamic motions in hydrogen bonds also contribute to the phase transition.
收录类别:EI;SCOPUS;SCIE
WOS核心被引频次:21
Scopus被引频次:21
资源类型:期刊论文
原文链接:https://www.scopus.com/inward/record.uri?eid=2-s2.0-84903277222&doi=10.1002%2fasia.201402132&partnerID=40&md5=7e49f94403348b0f85674374a17b91d8
TOP