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EPR Study of Ligand Effects in Spin Triads of Bis(o-Semiquinonato)Copper(II) Complexes

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Abstract

We report the X-band (9 GHz) electron paramagnetic resonance (EPR) study of series of bis(o-semiquinonato)copper(II) complexes with different ligands. It was found previously, that exchange interactions in spin triads of these compounds are very sensitive to the structure of the ligand coordinated to the central copper(II) ion. Ligand moderates the copper–radical and radical–radical exchange interactions and strongly changes the magnetic properties of the compound. Depending on a ligand, ferromagnetic or antiferromagnetic character of exchange dominates in the system. The EPR study of these complexes allowed us to obtain information on zero-field splitting parameters and their distributions in the studied compounds. The EPR results compliment previously obtained spectroscopic data on these compounds and suggest the pronounced plasticity of the clusters manifested in the broad distributions of their rhombicity parameters.

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Acknowledgments

We are very thankful to Dr. Galina V. Romanenko (International Topographic Center, Novosibirsk, Russia) for fruitful discussions on the X-ray structures of the studied complexes. This work was supported by the Russian Foundation for Basic Research (nr. 08-03-00326), the Council under the Russian Federation president (MK-60.2008.3), the Alexander von Humboldt Foundation (M.F.), the Grant for the Leading Scientific Schools (NSh-3604.2008.3), the Russian Science Support Foundation and the Program of Presidium, Russian Academy of Sciences (nr. 18.13). Federal Agency for Science and Innovations (No. 02.513.12.3098) and Federal Agency for Education (No. P 1144)

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Authors and Affiliations

  1. Laboratory of Magnetic and Spin Phenomena, International Tomography Center SB RAS, Institutskaya str. 3a, 630090, Novosibirsk, Russia

    Sergey L. Veber, Matvey V. Fedin, Renad Z. Sagdeev & Elena G. Bagryanskaya

  2. Novosibirsk State University, Pirogova str. 2, 630090, Novosibirsk, Russia

    Sergey L. Veber

  3. Laboratory of Multispin Coordination Compounds, International Tomography Center SB RAS, Institutskaya str. 3a, 630090, Novosibirsk, Russia

    Sergey V. Fokin & Victor I. Ovcharenko

Authors
  1. Sergey L. Veber
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  2. Matvey V. Fedin
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  3. Sergey V. Fokin
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  4. Renad Z. Sagdeev
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  5. Victor I. Ovcharenko
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  6. Elena G. Bagryanskaya
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Correspondence to Matvey V. Fedin.

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Veber, S.L., Fedin, M.V., Fokin, S.V. et al. EPR Study of Ligand Effects in Spin Triads of Bis(o-Semiquinonato)Copper(II) Complexes. Appl Magn Reson 37, 693–701 (2010). https://doi.org/10.1007/s00723-009-0087-2

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  • DOI: https://doi.org/10.1007/s00723-009-0087-2

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