Fluorescence emission modulation in cyanido-bridged Fe(Ⅱ)spin crossover coordination polymers  

作　　者：Xue-Ru Wu Zhi-Kun Liu Min Zeng Ming-Xing Chen Jun Tao Shu-Qi Wu Hui-Zhong Kou 

机构地区：[1]Department of Chemistry,Tsinghua University,Beijing 100084,China [2]Key Laboratory of Cluster Science of Ministry of Education,School of Chemistry and Chemical Engineering,Liangxiang Campus,Beijing Institute of Technology,Beijing 102488,China [3]Analytical Instrumentation Center,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China [4]Institute for Materials Chemistry and Engineering&IRCCS,Kyushu University,744 Motooka,Nishi-ku,Fukuoka 819-0395,Japan

出　　处：《Science China Chemistry》2022年第8期1569-1576,共8页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(21771115,21971142)。

摘　　要：Synergistic fluorescent spin crossover(SCO)bifunctional molecular materials have novel applications in the molecule-based magneto-optical switches.Herein,we report two novel three-dimensional(3D)Hofmann-type fluorescent SCO complexes[Fe^(II)-(tppe)MI(CN)_(2)]ClO_(4)·nSolv(tppe=tetra-(4-pyridylphenyl)ethene,M=Ag(tppe-Ag),Au(tppe-Au)).Both complexes show one-step abrupt SCO with the transition temperature of 230 K for tppe-Ag,and 245 K for tppe-Au accompanied by a color change from red to light yellow.The SCO process is confirmed by the variable-temperature single-crystal X-ray diffraction analysis on tppe-Ag.For the first time,the abnormal increase in emission intensity and concomitant large bathochromic shifts in the fluorescence spectra during the SCO process are realized in the 3D Hofmann-type coordination polymers expanded by the tetradentate tppe ligand.Moreover,tppe-Ag exhibits the unprecedented fluorescence emission from green to the edge of yellow.

关 键 词：FLUORESCENCE spin crossover multifunctional materials coordination polymers synergetic effect 

分 类 号：O641.4[理学—物理化学] O657.3[理学—化学]