The fluorescence characteristics, φf and τf, for two molecular forms of rhodamine B, RB± and RBH+, have been measured in a number of solvents selected for their hydrogen donor and/or acceptor properties, dielectric constant, viscosity, etc. The activation energies Ea calculated from the temperature dependence of φf are also solvent dependent. The results do not agree with the internal conversion mechanism suggested by Drexhage based on rotational motion of the diethylamino group. No single mechanism seems to be valid for both molecular forms. Two likely mechanisms are suggested. © 1986.
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