Add time:07/14/2019         Source:sciencedirect.com

An efficient Amberlite IRA-400 Cl basic anion exchange resin mediated multicomponent reaction of 2-hydroxybenzaldehydes, 1, 3-diketone and nucleophiles under neat condition afforded a number of fluorescent 4H-chromene derivatives in excellent yield. The structure of the synthesized compounds 4k and 4u were confirmed from single crystal XRD studies. 4H-Among the chromene derivatives, compound 4v synthesized from 4-diethylamino substituted 2-hydroxybenzaldehyde with dimedone and 2-hydroxynaphthaquinone has been found best florescent material. Photophysical properties such as solvatochromic effect, absorption, emission, Stocks shift and quantum yield of the selected compounds have been evaluated. The emission properties of the synthesized compounds suggested that these are a class of blue emissive fluorescent materials.

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