Reversible Phase Transition Triggered by Order–Disorder Transformation of Carboxyl Oxygen Atoms Coupled with Distinct Reorientations in [HN(C4H9)3](fumrate)0.5·(fumaric acid)0.5

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• 作者：Muhammad Adnan Asghar ; Zhihua Sun ; Tariq Khan ; Chengmin Ji ; Shuquan Zhang ; Sijie Liu ; Lina Li ; Sangen Zhao ; Junhua Luo
• 刊名：Crystal Growth & Design
• 出版年：2016
• 出版时间：February 3, 2016
• 年：2016
• 卷：16
• 期：2
• 页码：895-899
• 全文大小：370K
• ISSN：1528-7505

文摘

A new reversible molecular phase transition material [HN(C₄H₉)₃](fumrate)_0.5·(fumaric acid)_0.5 (1) has been successfully synthesized. Differential scanning calorimetry measurement shows a pair of reversible peaks at 181.9 and 178 K on heating and cooling modes, respectively. The large thermal hysteresis of ～3.9 K discloses its reversible first-order structural phase transition. Specific heat capacity and dielectric constant measurements around T_c further confirm its phase transition behaviors. The detailed structural analyses of 1 at variable temperatures reveal that its structural phase transition is mainly accomplished by the order–disorder transformations of carboxyl oxygen atoms and distinct reorientations among cations and anion-acid infinite sheets together with proton-dynamic motion. All these results open a new way to construct potential phase transition materials through the selection of flexible aliphatic cations with simple carboxyl-based anions.