Phase Transition Originating from Order-Disorder Transformations of Carboxy Oxygen Atoms Coupled with Dynamic Proton Motions in [PhCH<sub>2</sub>NH(CH<sub>3</sub>)<sub>2</sub>]<sub>2</sub>C<sub>2</sub>O<sub>4</sub>⋅H<sub>2</sub>C<sub>2</sub>O<sub>4</sub>
作者:Yuanyuan Tang、Chengmin Ji、Zhihua Sun、Shuquan Zhang、Tianliang Chen、Junhua Luo
DOI:10.1002/asia.201402132
日期:2014.7
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
一种新的分子相变材料,[的PhCH 2 NH(CH 3)2 ] 2 c ^ 2 Ò 4 ⋅H 2 c ^ 2 Ò 4已经成功合成了在151.6 K处经历可逆相变的,。差示扫描量热法(DSC),比热容和电介质测量结果证实了其可逆的相变,并具有15.1 K的大热滞后,表明相变是典型的一阶。可变温度单晶X射线衍射分析表明,羧基氧原子的无序转变会诱导结构相变。发现草酸单元的轻微重新取向伴随着低温下羧基氧原子的排序。的氘化类似物的DSC测量结果是到的不同1,表明氢键质子动态运动还有助于相变。