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Influence of Internal Heavy Atom Effect on the Deactivation of Triplet States in the Presence of Molecular Oxygen
Abstract
The influence of internal heavy atom еffect on the deactivation of triplet states in the presence of molecular oxygen for free bases and metal complexes of porphyrins with Mg(II), Zn(II), Pd(II), and Pt(II) ions in several solvents has been systematically studied. The experiments used laser photolysis techniques and direct measurement of the phosphorescence lifetime for metal complexes with heavy Pd(II) and Pt(II) ions at 293 K and atmospheric oxygen concentration in solution. The results obtained are compared with previously published data on laser photolysis of porphyrin metal complexes, and their partial discrepancy is established. The data obtained are discussed together with the results of the study of analogous compounds in degassed solutions. It has been established that the lifetime of the triplet states of metalloporphyrins at atmospheric oxygen concentration and in deoxygenated solutions is significantly affected by the effect of the internal heavy atom. It has been demonstrated that for triplet states, the polarity of the solvents used, as well as structural features of the compounds under study, have a significant effect.
About the Authors
A. S. Starukhin
B.I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Belarus
Belarus
Minsk
A. Yu. Panarin
SSPA “Optics, Optoelectronics, and Laser Technology”
Belarus
Belarus
Minsk
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Review
For citations:
Starukhin A.S., Panarin A.Yu. Influence of Internal Heavy Atom Effect on the Deactivation of Triplet States in the Presence of Molecular Oxygen. Zhurnal Prikladnoii Spektroskopii. 2023;90(5):747-753. (In Russ.)
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