Abstract
The UV–vis and fluorescence spectra of four monoazo dye derivatives were investigated in the solvents with different polarities. Characterization of UV–vis electronic bands is specified by calculating charge transfer energy (ECT) and ionization potential (Ip). The solvent effects on the absorption and fluorescence band maxima (νmax) were discussed using the solvent parameters. The magnitude and characteristics of the solute–solvent interactions were determined with multiple linear regression analysis. The π–π* transitions of monoazo derivatives are mainly controlled by global interaction, which is induction-dispersive and orientation interactions.
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