Transferência de energia entre corantes catiônicos em sistemas homogêneos

Abstract

Recebido em 2/8/02; aceito em 12/12/02 ENERGY TRANSFER BETWEEN CATIONIC DYES IN HOMOGENEOUS SYSTEMS. In this work, the energy transfer by dipole-dipole interaction between cationic dyes in n-alcohols (methanol, ethanol, 1-propanol and 1-butanol) is studied by time resolved and steady state fluorescence measurements. The critical radii of energy transfer were determined by three independent methods; the spectral overlap, fluorescence decay profiles, and relative intensity measurements. In all solvents, R 0 values of the dye pairs obtained from spectral overlap were between 40 to 90 Å. Steady state and time resolved fluorescence measurements resulted in values of R 0 in the range of 50-80 Å, with good correlation of values.