Green Synthesis, Physicochemical and Polarity Studies of Some Novel Biologically Active Donor Acceptor Chromophores (original) (raw)

2014, Asian Journal of Chemistry

Donor acceptor conjugated chromophores are defined the chromophores which have an electron donor group (D) and an electron accepter (A) group that exhibit intramolecular charge transfer through the π 1,2. The compounds which have end-capped with electron donating and accepting group arranged in either symmetrical A-π-A, D-π-D or asymmetrical A-π-D are known as chromophore orientations 3. The molecules having the donor acceptor conjugated framework have been largely investigated for optical-electrical applications from photophysical studies such as nonlinear optical properties 4 , photonic materials 5 , devices 6 , optical limiting 7 , electrochemical sensing 8 , light-emitting devices 9 , langmuir film 10 and solar cell materials 11. Chalcones are one of the compounds which have donor acceptor framework. Several reactions were reported for the synthesis of donor acceptor chromophores 12. However, aldol condensation is one of the most important reactions for the formation of donor acceptor chromophores by the nucleophilic addition reaction 13. Various synthetic methods have been reported so far, such as refluxing in an organic solvent 14 , the solvent-free solid-phase reaction 15 , ultrasonication 16 , photosen