Singlet-triplet Fission of Carotenoid Excitation in the Purple Phototrophic Bacteria Thermochromatium tepidum.

I B Klenina, A A Gryaznov, Z K Makhneva, I I Proskuryakov

Journal: Doklady. Biochemistry and biophysics 2019;485(1):135-137

PMID: 31201634

Abstract

Singlet fission of carotenoid excitation is studied in purple phototrophic bacterium Thermochromatium tepidum. Using time-resolved EPR and magnetic field-induced modulation of fluorescence yield it is shown that the concept of intramolecular excitation fission developed in a number of publications is not supported by the experimental results. The obtained data favor intermolecular fission mechanism involving two carotenoid molecules.

Address: IBBP RAS, 142290, Pushchino, Moscow oblast, Russia.; IBBP RAS, 142290, Pushchino, Moscow oblast, Russia. [email protected].

DOI: 10.1134/S1607672919020169

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https://dx.doi.org/10.1134/S1607672919020169

MeSH Terms: Carotenoids, Chromatiaceae, Electron Spin Resonance Spectroscopy, Fluorescence