溴甲酚紫-镧系复配物的制备及热致变色性能

Synthesis and Thermochromic Properties of Bromocresol Purple-Lanthanide Series Composite Materials

以溴甲酚紫为发色剂,镧系稀土金属离子(La3+、Ce3+和Nd3+等)为显色剂,在固化的溶剂环境下,制得一系列镧系复配物可逆热致变色材料。利用DSC检测热变色过程的可逆性及其能量变化,分析了显色剂的种类及用量、双显色剂的配比、溶剂的种类及用量对镧系复配物热致变色性能的影响。FTIR和UV-Vis测试结果表明,该材料的热致变色机理为溴甲酚紫的内酯环结构与醌式结构之间的相互转变,即分子间的电子得失。

A series of thermochromic composite materials made of bromocresol purple （BCP） and lanthanide series metal ions were synthesized. Effects of the sort, and the ratio of solvent and delomorphic reagent on the thermochromism were discussed. The thermochromic composites were characterized by FTIR,UV-Vis and DSC spectra. At room temperature, quinonoid BCP is coordinated with lanthanide series metal ions. After warming, the complex is separated, and lactone ring structure is recurring on BCP. As a result, the color inversion can be realized with temperature variation. The thermochromic mechanism of composites was summarized for electron gain or loss among the molecules.