Abstract
The electron spin echo (ESE) technique is applied to determine the spin relaxation times of long-lived light-induced radicals and short-term spin-correlated radical pairs (SCRPs) formed by the laser flash of a composite consisting of [6,6]-phenyl-C61-butyric acid methyl ether (PCBM) and poly-(3-hexylthiophene) (P3HT) at 80 K. The ESE signal dependences recorded to measure the longitudinal relaxation times of P3HT+/PCBM− SCRPs and the free P3HT+ radical are fitted by the exp(-(t/T 1)0.6) dependence with T 1 values lying in the microsecond time scale. The difference in the transverse spin relaxation times of the P3HT+/PCBM− radical paira appeared after selective and non-selective echo-detected EPR spectrum excitation is explained by the instantaneous diffusion model. Based on the model, the magnetic interaction energy between the electron spins in P3HT+/PCBM− SCRPs is estimated; E/ħ ∼ 106 s−1.
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Original Russian Text © 2014 M. N. Uvarov, A. G. Popov, E. A. Lukina, L. V. Kulik.
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Translated from Zhurnal Strukturnoi Khimii, Vol. 55, No. 4, pp. 679–685, July–August, 2014.
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Uvarov, M.N., Popov, A.G., Lukina, E.A. et al. Spin relaxation and structure of light-induced spin-correlated PCBM−/P3HT+ radical pairs. J Struct Chem 55, 644–650 (2014). https://doi.org/10.1134/S0022476614040088
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DOI: https://doi.org/10.1134/S0022476614040088