离子液体在热致变色材料中的应用

 含有大量羟基的离子液体可以与镍(II)金属配合物发生配位反应,含有二者的溶液具有热致变色性质。这种新型的热致变色体系,只需要普通太阳光的热量就能驱动变色,具有变色灵敏、环境友好等特点。这种热致变色体系在与高分子材料聚偏氟乙烯(PVDF)形成复合物后,仍然具有优良的热致变色特性,且这种复合物可以由不同的镍(II)金属配合物组成。另外,这种热致变色体系还可以通过引入额外的氯离子,使体系在温度低于0℃以下时有颜色变化响应,体系转变为冷致变色体系。本文介绍几种基于羟烷基咪唑类和基于季铵盐的深共熔溶剂类离子液体,分别与镍(II)金属配合物所组成的热致/冷致变色体系及相关基础研究和复合膜应用研究工作。

Application of ionic liquids in thermochromic materials

Because of existence of abundant hydroxyl groups, both of hydroxyly-3-methylimidazolium cation based ionic liquids and deep eutectic solvent can react with the Ni(II) complexes showing thermochromism. This novel thermochromic system can be driven by the solar heat, and are sensible and environmentally friendly. The ILs-Ni(II)-complex-PVDF composite films are thermochromic with different nickel complexes. Cryo-solvatochromism in response to cooling from room temperature to well below 0℃ can be achieved in a 1-hydroxylalkyl-3-methylimidazolium cation based ionic liquid, containing a Ni(II) complex and excess 1-butyl-3-methylimidazolium chloride. This review presents the recent fundamental and application work on a number of thermochromic and cryochromic systems based on Ni(II) complex and Ionic liquids, including the 1-hydroxylalkyl-3-methylimidazolium cation based ionic liquids and deep eutectic solvent.