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Absorptions and Fluorescence Properties of Some Substituted 2-Furylbenzothiazoles and Their Vinylogues in Different Solvents

Absorption and fluorescence emission spectra of six substituted 2-(2-furyl)benzothiazoles and their vinylogues have been studied in different solvents at room temperature. It was found that both, the kind of the substituent and the solvent polarity influenced the changes of the spectral properties. The ethylenic double bond between the furyl and benzothiazolyl moiety exhibits a bathochromic shift of the longwave absorption maxima for 1927-3182 cm-1 as well as a bathochromic shift of the fluorescence maxima for 2646-3338 cm-1. For substituted 2-(2-furyl)benzothiazoles a linear relationship of solvent polarity against Stokes shifts was observed. This group of compounds exhibits higher relative fluorescence quantum efficiency than their vinylogues. The most fluorescent compound among them is 2-(5-phenyl-2-furyl)benzothiazole.

benzothiazole ; fluorescence ; quantum efficiency

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