Abstract
The photophysical and spectral characteristics of two unsaturated carbonyl compounds, a chalcone and a cinnamylideneacetophenone, were systematically analyzed using various analytical techniques such as IR, 1H and 13C NMR spectroscopy, ESI mass spectrometry, absorption and emission spectra. Dimethylamino and ethoxy substituents were purposefully introduced into appropriate positions of the aromatic rings on the studied structures in order to results in highly fluorescent compounds. Both compounds showed bright visible-light emission upon ultraviolet light excitation, in which the cinnamylideneacetophenone derivative in dimethyl sulfoxide was found to emit in the red at 612 nm with a substantial Stoke shift of 6335 cm−1. The solvent effect on the photophysical properties, such as absorption, emission, and Stokes shift, was investigated and the results were compared to evaluate the impact of extended π-conjugation. The experimental findings are consistent with the theoretical results calculated by using time-dependent density functional theory.
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