Abstract
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 spectral properties. The ethylenic double bond between the furyl and benzothiazolyl moiety caused a bathochromic shift in the longwave absorption maxima of 1927–3182 cm− 1 as well as a bathochromic shift in the fluorescence maxima of 2646–3338 cm− 1. For substituted 2‐(2‐furyl)benzothiazoles a linear relationship between solvent polarity and Stokes shift was observed. This group of compounds exhibited higher relative fluorescence quantum efficiency than their vinylogues. The most fluorescent compound among them was 2‐(5‐phenyl‐2‐furyl)benzothiazole.
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