Abstract
Using the method of flash photolysis, the effect of deuteration of a solvent on the kinetics of triplet-triplet annihilation is studied on the example of Mg-phthalocyanine (Mg-Phc) in methanol-h 4 and methanol-d 4 at ∼298 K. The time and concentration kinetic dependences are different in different solvents, which cannot be explained only by the difference in the viscosity of the latter. The experimental data are analyzed based on consideration of the triplet-triplet annihilation mechanism via the formation of triplet-triplet complexes from molecules in a triplet state. It is established that in methanol-d 4 the constants of the rates of monomolecular deactivation of the triplet state and of the decomposition of the complexes is 1.5–2 times smaller than in methanol-h 4. The effect of deuteration is explained by the decrease in the rate of dipole-dipole energy transfer from the triplet state of the pigment to the solvent molecules in deuteration.
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Sapunov, V.V. Kinetics of Triplet-Triplet Annihilation of Mg-Phthalocyanine in Methanol and Deuteromethanol. Journal of Applied Spectroscopy 69, 831–835 (2002). https://doi.org/10.1023/A:1022450101641
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DOI: https://doi.org/10.1023/A:1022450101641