Abstract
Photoresponsive low-molecular-weight gel, a class of fascinating soft material, draws increasing attention due to their versatile applications. Herein, three azobenzene derivatives (A1-3) containing urea moiety and various alkyl chains were synthesized directly as organic gelators. They displayed satisfactory gelation capacity in plenty of solvents. Benefitting from the various configurations and/or polarities of trans-/cis-azobenzene, which may break the balance of the cooperation of various non-covalent interactions, the gel prepared by A2 in DMSO underwent reversible gel-sol transition with light irradiation at different wavelengths. Moreover, the tunable fluorescence intensity of dyes was achieved by this photoswitchable gel-sol system.
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