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

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

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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(H2imb)2+((H2imb)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(H2imb)2+cation.Three complexes(H2imb)(NO3)2(1),(H2imb)Cl2·H2O(2),and(H2imb)ZnCl4(3)have been synthesized in which(H2imb)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(H2imb)2+has been validated to be critical to yield colored long-lived charge-separated states.

SupramolecularPhotochromicX-ray inducedAnion-directed foldingElectron-deficient viologens

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

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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

College of Chemistry and Materials Science,Fujian Normal University,Fuzhou 350007,China

Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials,Xiamen Institute of Rare Earth Materials,Haixi Institutes,Chinese Academy of Sciences,Xiamen 361021,China

Fujian Science & T

Institute for Materials Chemistry and Engineering,Kyushu University,Fukuoka 819-0395,Japan

World Premier International(WPI)Center for Materials Nanoarchitectonics(MANA),National Institute for Materials Science(NIMS),Ibaraki 305-0044,Japan

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2024

10.1016/j.cclet.2023.109052

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(8)