Abstract
An efficient Amberlite resin catalyzed one-pot, multicomponent reaction of 1,2-phenylenediamine, 2-hydroxynaphthalene-1,4-dione, 2-hydroxy benzaldehydes, and 1,3-diketones in EtOH/H2O (1/1, v/v) as solvent to obtain the fluorescent 4H-chromenes and benzo[a]chromenophenazines has been achieved. The structure of compounds 5 g and 6e were confirmed from single crystal XRD analysis. Photophysical properties such as solvatochromism, absorption, emission, Stocks shift and quantum yield have been evaluated. The emission spectra suggested that these are blue emissive fluorescent compounds. Further, 4H-chromenes and benzo[a]chromenophenazines act as fluorescent chemosensor for the detection of metal-ions. Among the screened compounds, 4H-chromene derivative 5a and benzo[a]chromenophenazine 6a have been found to be good metal ion sensors for the detection of Fe3+ and Cu2+ ions.
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