Sun Bing, Liu Xiao-Fei, Li Xiang-Yang, Cao Yang, Yan Ze, Fu Lin, Tang Nujiang, Wang Qiang, Shao Xiangfeng, Yang Dezheng, Zhang Hao-Li
State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Special Function Materials and Structure Design, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China.
Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, P. R. China.
Angew Chem Int Ed Engl. 2020 Jan 2;59(1):203-208. doi: 10.1002/anie.201910701. Epub 2019 Nov 19.
Two-dimensional (2D) hybrid perovskites have shown many attractive properties associated with their soft lattices and multiple quantum well structure. Herein, we report the synthesis and characterization of two new multifunctional 2D hybrid perovskites, (PED)CuCl and (BED) CuCl , which show reversible thermochromic behavior, dramatic temperature-dependent conductivity change, and strong ferromagnetism. Upon temperature change, the (PED)CuCl and (BED) CuCl crystals exhibit a reversible color change between yellow and red-brown. The associated structural changes were monitored by in situ temperature-dependent powder X-ray diffraction (PXRD). The (BED) CuCl exhibits superior thermal stability, with a thermochromic working temperature up to 443 K. The conductivity of (BED) CuCl changes over six orders of magnitude upon temperature change. The 2D perovskites exhibit ferromagnetic properties with Curie temperatures around 13 K.
二维（2D）杂化钙钛矿因其柔软的晶格和多量子阱结构展现出许多吸引人的特性。在此，我们报告了两种新型多功能二维杂化钙钛矿（PED）CuCl和（BED）CuCl的合成与表征，它们表现出可逆热致变色行为、显著的温度依赖性电导率变化以及强铁磁性。随着温度变化，（PED）CuCl和（BED）CuCl晶体在黄色和红棕色之间呈现可逆颜色变化。通过原位变温粉末X射线衍射（PXRD）监测相关的结构变化。（BED）CuCl表现出优异的热稳定性，热致变色工作温度高达443K。（BED）CuCl的电导率随温度变化超过六个数量级。这些二维钙钛矿表现出铁磁特性，居里温度约为13K。
