Raosaheb S. Patil, A. Patil, V. Patil
Jun 1, 2019
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Influential Citations
6
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Journal
Journal of Luminescence
Abstract
Abstract Herein we report a simple and convenient, base promoted synthetic method for preparation of (Z)-2-(2-phenyl-4H-benzo[4,5]thiazolo[3,2-a]pyrimidin-4-ylidene)acetonitrile derivatives. The reactions involve ring transformation of 2H-pyran-3-carbonitriles 1 with 2-aminobenzthazole 2 using Cs2CO3 at room temperature. Absorption and emission properties of synthesized compounds were investigated in solvents of varying polarity. It was found that for all studied compounds no distinguishable behaviour was observed for absorption in different solvents whereas some notable changes were observed in emission fluorescence spectras. Solvent dependent spectral properties of compounds were investigated using Lippert-Mataga plot. A rational relationship is examined between fluorescence quantum efficiencies and calculated HOMO energies.