Journal
DYES AND PIGMENTS
Volume 101, Issue -, Pages 164-171Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2013.09.043
Keywords
Iminocoumarin; Methoxycoumarin; Fluorescence; Aggregation-induced emission (AIE); Crystallization-enhanced emission (CEE); Fluorescent fiber
Funding
- French Ministry of Foreign and European Affairs
- Ministry of Higher Education, Scientific Research and Technology in Tunisia
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The fluorescence properties of four methoxy derivatives of 3-cyano-2-(N-ethoxycarbonyl)iminocoumarin, differing by the position and number of the methoxy substituents, were investigated. The 8-methoxy-iminocoumarin derivative was virtually non-fluorescent. The 7-methoxy-iminocoumarin derivative was only weakly fluorescent both in solution and in the solid state. The 6-methoxy-iminocoumarin derivative was poorly fluorescent in every solvent investigated, but it showed high photoluminescence in the solid state. To our knowledge, this is the first example of crystallization-enhanced emission (CEE) in the iminocoumarin series. The mechanism probably encompasses restricted rotation and favorable molecular packing. Moreover, this compound spontaneously crystallized as long microfibers. The 5,7-dimethoxy-iminocoumarin derivative exhibited good fluorescence in very polar solvents and was intensely luminescent in the crystalline state. The last two substitution patterns, 6-methoxy and 5,7-dimethoxy, could be of high interest for the design of new fluorescent materials. (C) 2013 Elsevier Ltd. All rights reserved.
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