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Pure Appl. Chem., 2001, Vol. 73, No. 3, pp. 405-409

Dynamic solvatochromism in solvent mixtures

Diana E. Wetzler1, Carlos Chesta2, Roberto Fernández-Prini1,3 and Pedro F. Aramendía1*

1 INQUIMAE, DQIAQF, FCEN, Universidad de Buenos Aires, C. Universitaria, 1428 Buenos Aires, Argentina
2 Dept de Química, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Argentina
3 Unidad de Actividad Química, CNEA, Libertador 8250 1428 Buenos Aires, Argentina

Abstract: Solvatochromism and thermochromism of 4-aminophthalimide and 4-amino-N-methylphthalimide were studied by absorption and steady-state and time-resolved emission spectroscopy in solvent mixtures of toluene­ethanol and toluene­acetonitrile at different temperatures. Emission spectra shift to the red upon addition of a polar solvent (PS) to toluene. Solvent mixtures show a much greater thermochromic shift to the blue in emission than the neat solvents. This is explained by the decrease in temperature of the exothermic association of the polar solvent to the excited state. Emission spectra are time dependent in solvent mixtures in the ns timescale. The time evolution of this emission is interpreted on the basis of the different solvation of the ground state and the emitting excited state. Stern­Volmer plots are obtained for the dependence of the spectral-shift characteristic time with [PS].