Determination of Kamlet-Abboud-Taft solvatochromic parameters in some green solvent mixtures

The solvatochromism is a simple and suitable method to study solvent-solute interactions (special and nonspecial interactions). Structural and intermolecular interactions of solvatochromic indicators Reichardt’s dye (RD), 4-nitroaniline (PNA) and N,N-Dimethyl-4-nitroanilin (DMNA) were investigated in the green solvent mixtures of N-Formylmorpholin with water, ethanol, 1-propanol and 2-propanol. The solvatochromic parameters (α, hydrogen -bond donor acidity; β, hydrogen-bond acceptor basicity; π*, dipolarity/polarizability; ET(30), Reichardt’s polarity parameter) were determined in these mixtures at 298 K using UV/Vis spectrophotometric method. Finally, the variation of Kamlet-Abboud-Taft (KAT) parameters of the solvatocoromic dyes by changing the solvent percentage are discussed.