Photophysical properties and estimation of ground and excited state dipole moments of 7-diethylamino and 7-diethylamino-4-methyl coumarin dyes from absorption and emission spectra

The absorption and fluorescence spectra of the 7-diethylamino-4-methyl coumarin (DAMC) in ethanol-water (1:9 v/v) solution at varying pH values were investigated. The interaction between DAMC and bovine serum albumin (BSA) was investigated by fluorescence spectroscopy. The Stern-Volmer quenching constant, the quenching rate constant of the bimolecular reaction (kq), the binding constant, and number of binding sites are mentioned but not calculated in the paper. Moreover, in a preliminary pharmacological study, DAMC not only remarkably increased cellular apoptosis in a concentration-dependent manner but also clearly induced A549 cell cycle arrest. Thus, these coumarin derivatives merit investigation as novel potential antitumor agents with further structural modification to produce an optimal lead compound and elucidate the detailed pharmacological mechanism.

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