A new class of crystalline X-ray induced photochromic materials assembled from anion-directed folding of a flexible cation  

作　　者：Hong-Jin Liao Zhu Zhuo Qing Li Yoshihito Shiota Jonathan P.Hill Katsuhiko Ariga Zi-Xiu Lu Lu-Yao Liu Zi-Ang Nan Wei Wang You-Gui Huang 

机构地区：[1]CAS Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Provincial Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China [2]College of Chemistry and Materials Science,Fujian Normal University,Fuzhou 350007,China [3]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials,Xiamen Institute of Rare Earth Materials,Haixi Institutes,Chinese Academy of Sciences,Xiamen 361021,China [4]Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350108,China [5]Institute for Materials Chemistry and Engineering,Kyushu University,Fukuoka 819-0395,Japan [6]World Premier International(WPI)Center for Materials Nanoarchitectonics(MANA),National Institute for Materials Science(NIMS),Ibaraki 305-0044,Japan

出　　处：《Chinese Chemical Letters》2024年第8期554-557,共4页中国化学快报（英文版）

基　　金：supported by National Natural Science Foundation of China(No.92261109);Natural Science Foundation of Fujian Province(No.2020J05080);Project Funded by China Postdoctoral Science Foundation(No.2023M733496);Natural Science Foundation of Xiamen(No.3502Z20206080);Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(No.2021ZR110);Recruitment Program of Global Youth Experts,Youth Innovation Promotion Association CAS(No.2021302).

摘　　要：Electron-deficient viologens are widely used as ligands or structure-directing agents(SDAs)to synthesize crystalline X-ray induced photochromic materials.Here,a new rational strategy of anion-directed fold-ing a flexible cation(H_(2)imb)^(2+)((H_(2)imb)^(2+)=di-protonated 2,3-bis(imidazolin-2-yl)-2,3-dimethylbutane)has been developed.Electron-donating Cl−and(ZnCl4)2−are used to direct folding a flexible electron-deficient(H_(2)imb)^(2+)cation.Three complexes(H_(2)imb)(NO_(3))2(1),(H_(2)imb)Cl2·H_(2)O(2),and(H_(2)imb)ZnCl4(3)have been synthesized in which(H_(2)imb)^(2+)crystallize in an anti-conformation,88.8°-gauche,and 51.8°-gauche,respectively.In contrary to X-ray silent complex 1,X-ray induced photochromism has been achieved in both complex 2 and 3.An intermolecular charge-transfer mechanism has been elucidated and the anion directed folding of(H_(2)imb)^(2+)has been validated to be critical to yield colored long-lived charge-separated states.

关 键 词：Supramolecular Photochromic X-ray induced Anion-directed folding Electron-deficient viologens 

分 类 号：TB34[一般工业技术—材料科学与工程]