Abstract: The development of smart technology is a ubiquitous trend in modern society. As they are the basis of this smart technology revolution, smart materials are the focus of much recent research. Thermochromic materials are smart materials that change their color in response to a change in external temperature. They are used in diverse applications such as smart windows, temperature sensing, anti-counterfeiting, smart textiles and color-changing paints, among many others. Several types of thermochromic materials exist. Thermochromic transition metal comp-lexes have several properties that make them attractive for application development. These include lower color-changing temperatures, distinct color changes and unique electron transfer characteristics. The early work on thermochromic transition metal complexes focused on determining their structures and the thermochromic mechanisms. Application development was limited because of intrinsic shortcomings, such as low molar extinction coefficients and the need for solvents. In the last decade, the number of applications of thermochromic transition metal complexes has increased substantially. This is a result of advances in the use of ionic liquids, new ligands, and the integration of transition metal complexes into composites with other functional materials. Despite this progress, reviews of this area are rare. To properly design smart thermochromic materials for specific applications, a deep understanding of the color-changing mechanism is needed. This article first describes the color-changing mechanisms of thermochromic transition metal complexes, primarily geometry changes, ligand changes and spin crossover. The article next summarizes recent progress on the applications of these complexes in temperature sensing, smart windows and other fields, and then concludes with comments on the direction of future research.
通讯作者:
* 杨帅军,济南大学讲师、硕士研究生导师。于四川大学获学士及博士学位,之后到中国香港中文大学从事博士后研究工作,现就职于济南大学智能材料与工程研究院。主要从事刺激响应型功能材料的开发与应用。作为第一或通信作者在Journal of the American Chemical Society、Angewandte Chemie International Edition等国际期刊上发表论文6篇。ism_yangsj@ujn.edu.cn 蒋绪川,济南大学教授、博士研究生导师,智能材料与工程研究院院长,国家“千人计划”学者。2001年博士毕业于中国科技大学。主要从事光、热、电、磁等外界刺激响应型无机功能材料的研究,作为第一或通信作者发表SCI论文及专著章节160余篇,被引次数超过8 000次。ism_jiangxc@ujn.edu.cn
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