The Internal Heavy Atom Effect on the Deactivation of Triplet States of Porphyrins in the Presence of Molecular Oxygen

The internal heavy atom effect on the deactivation of triplet states of free porphyrin bases and their metal complexes with Mg(II), Zn(II), Pd(II), and Pt(II) ions in several solvents containing molecular oxygen has been systematically studied. The experiments used laser photolysis techniques and di...

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Published inJournal of applied spectroscopy Vol. 90; no. 5; pp. 1037 - 1042
Main Authors Starukhin, A. S., Panarin, A. Yu
Format Journal Article
LanguageEnglish
Published New York Springer US 01.11.2023
Springer Nature B.V
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Abstract The internal heavy atom effect on the deactivation of triplet states of free porphyrin bases and their metal complexes with Mg(II), Zn(II), Pd(II), and Pt(II) ions in several solvents containing molecular oxygen has been systematically studied. The experiments used laser photolysis techniques and direct measurement of the phosphorescence lifetime of the 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 the laser photolysis of porphyrin metal complexes and a partial discrepancy was found. These data are discussed together with the results of a study of similar compounds in degassed solutions. The triplet state lifetimes of metalloporphyrins at atmospheric oxygen concentration and in deoxygenated solutions were found to be subject to the internal heavy atom effect. The polarity of the solvents used and structural features of the compounds studied were also found to have a significant effect on the triplet states of these porphyrins.
AbstractList The internal heavy atom effect on the deactivation of triplet states of free porphyrin bases and their metal complexes with Mg(II), Zn(II), Pd(II), and Pt(II) ions in several solvents containing molecular oxygen has been systematically studied. The experiments used laser photolysis techniques and direct measurement of the phosphorescence lifetime of the 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 the laser photolysis of porphyrin metal complexes and a partial discrepancy was found. These data are discussed together with the results of a study of similar compounds in degassed solutions. The triplet state lifetimes of metalloporphyrins at atmospheric oxygen concentration and in deoxygenated solutions were found to be subject to the internal heavy atom effect. The polarity of the solvents used and structural features of the compounds studied were also found to have a significant effect on the triplet states of these porphyrins.
Author Starukhin, A. S.
Panarin, A. Yu
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Keywords laser photolysis
phosphorescence lifetimes in different solvents
porphyrin free bases and metalloporphyrins with different types of metal ions
triplet state lifetimes
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Snippet The internal heavy atom effect on the deactivation of triplet states of free porphyrin bases and their metal complexes with Mg(II), Zn(II), Pd(II), and Pt(II)...
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SubjectTerms Analytical Chemistry
Atomic energy levels
Atomic/Molecular Structure and Spectra
Base metal
Coordination compounds
Deactivation
Deoxygenation
Oxygen
Palladium
Phosphorescence
Photolysis
Physics
Physics and Astronomy
Platinum
Porphyrins
Solvents
Zinc
Title The Internal Heavy Atom Effect on the Deactivation of Triplet States of Porphyrins in the Presence of Molecular Oxygen
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