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Photostimulated electron transfer and its action on paramagnetism of Sp3Cr(C2O4)3 single crystals

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Abstract

The effect of irradiation by ultraviolet light on the effective magnetic moment of a paramagnetic single crystal based on photochrome spiropyran (Sp) and chromium oxalates Sp3Cr(C2O4)3 molecules is detected. It is shown that the deviation of the temperature dependence of the magnetic moment from the Curie law is caused not by the exchange interaction, but by electron redistribution between Cr3+ and Cr4+ ions and spiropyran molecules Sp0 and Sp+. Analysis of the angular dependence of EPR spectra makes it possible to determine the contribution of Cr3+ ions to the magnetic properties of the crystals and to determine the crystal field parameters D = 0.619 cm−1 and E = 0.024 cm−1. Irradiation of hydrated samples by ultraviolet light leads to intensity redistribution of EPR lines attributed to Cr3+ and Sp0. Thermally stimulated paramagnetism of triplet states of spiropyran ions Sp+ and the SpI salt is observed.

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Authors and Affiliations

  1. Institute of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    R. B. Morgunov, F. B. Mushenok, S. M. Aldoshin & N. A. Sanina

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  1. R. B. Morgunov
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  2. F. B. Mushenok
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  3. S. M. Aldoshin
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  4. N. A. Sanina
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Correspondence to R. B. Morgunov.

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Original Russian Text © R.B. Morgunov, F.B. Mushenok, S.M. Aldoshin, N.A. Sanina, 2009, published in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2009, Vol. 136, No. 4, pp. 775–784.

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Morgunov, R.B., Mushenok, F.B., Aldoshin, S.M. et al. Photostimulated electron transfer and its action on paramagnetism of Sp3Cr(C2O4)3 single crystals. J. Exp. Theor. Phys. 109, 667–675 (2009). https://doi.org/10.1134/S1063776109100136

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  • DOI: https://doi.org/10.1134/S1063776109100136

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