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EPR investigation of the spin-spin interactions in a Cu(II)-Gd(III)-Fe(III) heterospin system

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Abstract

The spin-spin interactions in a system that contains three different spin carriers, [{LCu}Gd(H2O)3×{Fe(CN)6}] n ·4nH2O (1) [L2−, N,N-propylenedi(3-methoxysalicylideneiminato)], were investigated by electron paramagnetic resonance spectroscopy. Additional information was obtained by analyzing the discrete heterobinuclear system [LCu(OH2)Gd(O2NO)3] (2), which contains the Cu(II)-Gd(III) pair also existing in the structure of 1, and the compounds [{LCu}Gd(H2O)3{Co(CN)6}] n ·3.5nH2O and [{LCu}La(H2O)3×{Fe(CN)6}] n ·4nH2O, which are isostructural with 1 and in which the paramagnetic low-spin Fe(III) and Gd(III) ions were replaced by diamagnetic low-spin Co(III) and La(III), respectively. The investigations were carried out in the temperature range of 293–4 K in both X- and Q-bands and also using a dual-mode X-band. The experimental spectra of the Cu(II)-Gd(III) pairs in 2 were interpreted as the sum of spectra of the ground spin state with total S = 4 and the excited state with S = 3 appearing due to the ferromagnetic exchange interaction between Cu(II) and Gd(III) ions. By fitting the experimental and simulated spectra, the zero-field splitting parameters of the Gd(III) ion are estimated and it is shown that no influence of the anisotropic interaction is detected. The magnetic properties of 1 are discussed from the perspective of the interaction of the Cu(II)-Gd(III) binuclear fragments with the Fe(III) ions.

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Authors and Affiliations

  1. Zavoisky Physical-Technical Institute, Russian Academy of Sciences, Kazan, Russian Federation

    A. Sukhanov, R. Galeev, L. Mingalieva & Violeta K. Voronkova

  2. Inorganic Chemistry Laboratory, Faculty of Chemistry, University of Bucharest, Bucharest, Romania

    R. Gheorghe & M. Andruh

  3. Kazan Physical-Technical Institute, Russian Academy of Sciences, Sibirsky trakt 10/7, 420029, Kazan, Russian Federation

    Violeta K. Voronkova

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  1. A. Sukhanov
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  2. R. Galeev
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  3. L. Mingalieva
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  4. Violeta K. Voronkova
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  5. R. Gheorghe
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  6. M. Andruh
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Correspondence to Violeta K. Voronkova.

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Sukhanov, A., Galeev, R., Mingalieva, L. et al. EPR investigation of the spin-spin interactions in a Cu(II)-Gd(III)-Fe(III) heterospin system. Appl Magn Reson 35, 613–623 (2009). https://doi.org/10.1007/s00723-009-0190-4

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  • DOI: https://doi.org/10.1007/s00723-009-0190-4

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