Magnetic field effect on ion pair dynamics upon bimolecular photoinduced electron transfer in solution

Feskov, Serguei V.; Rogozina, Marina V.; Ivanov, Anatoly I.; Aster, Alexander; Koch, Marius; Vauthey, Eric

doi:10.1063/1.5064802

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Title		Magnetic field effect on ion pair dynamics upon bimolecular photoinduced electron transfer in solution
Authors		Feskov, Serguei V. Rogozina, Marina V. Ivanov, Anatoly I. Aster, Alexander Koch, Marius Vauthey, Eric
Published in		The Journal of chemical physics. 2019, vol. 150, no. 2, 024501
Abstract		The dynamics of the ion pairs produced upon fluorescence quenching of the electron donor 9,10-dimethylanthracene (DMeA) by phthalonitrile have been investigated in acetonitrile and tetrahydrofuran using transient absorption spectroscopy. Charge recombination to both the neutral ground state and the triplet excited state of DMeA is observed in both solvents. The relative efficiency of the triplet recombination pathway decreases substantially in the presence of an external magnetic field. These results were analyzed theoretically within the differential encounter theory, with the spin conversion of the geminate ion pairs described as a coherent process driven by the hyperfine interaction. The early temporal evolution of ion pair and triplet state populations with and without magnetic field could be well reproduced in acetonitrile, but not in tetrahydrofuran where fluores- cence quenching involves the formation of an exciplex. A description of the spin conversion in terms of rates, i.e., incoherent spin transitions, leads to an overestimation of the magnetic field effect.
Identifiers		DOI: 10.1063/1.5064802
Full text		Article (Published version) (1.1 MB) - Free access Other version: http://aip.scitation.org/doi/10.1063/1.5064802
Structures		Faculté des sciences / Section de chimie et biochimie / Département de chimie physique
Research group		Groupe Vauthey
Project		Swiss National Science Foundation: 200020_165890
Citation (ISO format)		FESKOV, Serguei V. et al. Magnetic field effect on ion pair dynamics upon bimolecular photoinduced electron transfer in solution. In: Journal of Chemical Physics, 2019, vol. 150, n° 2, p. 024501. doi: 10.1063/1.5064802 https://archive-ouverte.unige.ch/unige:114615