Dipole moments of phenalenone dyes determined in liquid and polymer polar media

Abstract

Dipole moments of the three phenalenone dyes (6-amino-1-phenalenone, 2-chloro-6-(3-methylamino)-1-phenalenone, 2-chloro-6-(3-hydroxypropylamino)-1-phenalenone) have been determined experimentally by means of a solvatochromic method and Bakshiev's, Kawski-Chamma-Viallet's theoretical approach with a use of liquid solvents and polyurethane polymer matrices of different polarity. The excited states of phenalenone dye molecules are found to be more polar than the ground ones. The values of dipole moments vary in a dependence on the substituents in the phenalenone dye molecules. The comparative analysis shows a good correlation between the calculated dye parameters, obtained with a use of liquid and polymer media.