Singlet-excitation migration in pure liquid methyl- and ethylnaphthalenes.

概要

論文の詳細を見る
The fluorescence quenching of solvent molecules and solute molecules was studied in the alkylnaphthalene solvents. The singlet-excited states of the solvent molecules were quenched by 1,4-bis(trichloromethyl)benzene with the rate parameter of 2.8×1010 mol−1 dm3 s−1 at 45 °C. This rate parameter is twelve times as great as that of the solute, dibenz[a,c]anthracene, in the solvent, 1-methylnaphthalene. The diffusion constant of the excitation migration of the solvent molecule is calculated to be larger (0.35×10−4 cm2 s−1 at 45 °C) than that (0.03×10−4 cm2 s−1) of the solute. The temperature coefficient (22 kJ/mol) of the excitation migration is too small to explain the migration mechanism on the hypothesis of the "successive association-dissociation reaction of excimer" proposed by Birks. The presence of a short-range exciton in the liquid is likely.
公益社団法人日本化学会の論文