Abstract
A new class of 5-aryl-3-((E)-3-phenylallylidene)-2(3H)-furanones (3a-f) derivatives was synthesised and thoroughly characterised using 1H NMR, FT-IR, and elemental analysis. The absorption and emission spectra of prepared compounds (3a-f) have been conducted in ten different solvents with different polarities. The emission spectra for all synthesized derivatives are the same in shape, with a large red shift being recorded with increasing solvent polarity. Additionally, the quantum yield decreases more than 20-fold from toluene to water. Due to the resonance structures of such derivatives, the electronegative oxygen atom in the unsaturated carbonyl fragment can form hydrogen bonds with protic solvents.
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