Abstract
Red emitting coumarin-carbazole chalcones of the D- π –A and D–π–A–π–D type were synthesized with the coumarin core as acceptor and carbazole with anchoring carboxylic group at the end of N-alkyl chain as donor. The introduction of extra donor on the coumarin core led to bathochromic shift. Further, the BF2 complexation of the synthesized chalcones led to emission in red region due to efficient increase in the electron attracting capacity of coumarin acceptor. A strong emission solvatochromism than absorption was observed for the studied dyes which is well understood with the help of the multi-linear regression analysis. The frontier molecular orbital analysis of the dyes suggest strong intramolecular charge transfer characteristics. Viscosity induced emission enhancement was observed for all dyes in polar-protic (ethanol: PEG 400) solvent mixtures. As the dyes 6 and 8 emit at 612 nm and 647 nm in polar solvents these can be used as red emitting fluorescent molecular rotors.
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