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Dual Visible Light‐Triggered Photoswitch of a Diarylethene Supramolecular Assembly with Cucurbit[8]uril
Author(s) -
Liu Guoxing,
Zhang YingMing,
Wang Conghui,
Liu Yu
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201703562
Subject(s) - photoswitch , diarylethene , photochromism , cucurbituril , supramolecular chemistry , dual (grammatical number) , photochemistry , chemistry , materials science , organic chemistry , molecule , art , literature
Research on photochromic molecules switched by visible light is of particular interest for their application in bioimaging and stimuli‐responsive materials. Here, a photoswitchable supramolecular assembly comprised of monocharged bispyridinium‐modified diarylethenes (DAEs) and cucurbit[8]uril (CB[8]) has been constructed, which exhibits reversible photochromic behaviour with visible light in both directions. The transformation of CB[8] not only prompts the DAEs to form charge‐transfer complexes, but also restricts its intramolecular rotation to enhance fluorescence emission. In this CB[8]‐containing supramolecular system, the π‐conjugation is extended and its absorption is bathochromically shifted for visible light‐driven cyclization of DAEs. Meanwhile, the fluorescence of the supramolecular assembly can also be reversibly modulated by visible light. These findings may furnish a new strategy for the development of visible light‐driven fluorescent biomaterials and molecular machines.