Add time:08/22/2019         Source:sciencedirect.com

Energy transfer from 3,5-Xylenol (cas 108-68-9) to 2,6-diphenylpyridine (DPP) in a very dilute solution of the molecules in solvents of different viscosity, from 0.29 to 4.30 Cp, at 300 K is discussed. Excited xylenol does not form an exciplex with DPP. Non-radiative deactivation of the excited state of the xylenol proceeds through dissipation of excitational energy from the S1 state of xylenol to the S1 state of DPP. A suitable relation that takes into account the low concentrations of 3,5-xylenol and DPP in different solvents has been used to calculate the energy transfer quantum efficiency, fXY. In non-polar or polar solvents, the non-radiative part of energy transfer efficiency increases and the radiative part decreases as the concentration of DPP is increased. The non-radiative energy transfer rate constant, KXY, for the system of xylenol and DPP in solvents of different viscosity gradually decreases with increasing viscosity of the medium. In all solvents, the value of KXY, is larger than the collisional diffusion controlled rate and the Förster critical transfer distance, RO, is much greater than the collisional separation distance rX + rY, the sum of the radii of xylenol (X) and DPP (Y) molecules. It is suggested that a diffusion-assisted long range dipole-dipole interaction is mainly responsible for energy transfer from xylenol to DPP. The efficiency of energy migration is negligibly small.

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