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Heterospin complexes based on cobalt semiquinolate with nitroxides

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Abstract

Heterospin complexes based on cobalt semiquinolate with stable nitroxides of composition [Co(SQ)2(NIT)2]·8CH2Cl2, [Co(SQ)2(NIT)2]·4MeCN, [Co(SQ)2(IN)2]·5Me2CO, [Co(SQ)2(IN)2]·4MeCN, and [Co(SQ)2(IN)2]·2CH2Cl2·C6H14, where SQ is 3,6-di-tert-butyl-o-benzosemiquinolate, NIT is 4,4,5,5-tetramethyl-2-(1-methyl-1H-imidazol-5-yl)-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl, and IN is the imine analog of NIT, viz., 4,4,5,5-tetramethyl-2-(1-methyl-1H-imidazol-5-yl)-4,5-dihydro-1H-imidazole-1-oxyl, were synthesized. The characteristic feature of these compounds is that they contain two different types of paramagnetic organic ligands. The X-ray diffraction study showed that the solid phases of the complexes have a molecular structure. According to the data from thermomagnetic analysis (2–350 K), all complexes exhibit effects of valence tautomerism at ∼20 °C. It was found that incorporated solvent molecules have an effect on the magnetic anomaly temperature.

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Authors and Affiliations

  1. International Tomography Center, Siberian Branch of the Russian Academy of Sciences, 3a ul. Institutskaya, 630090, Novosibirsk, Russian Federation

    E. Yu. Fursova, O. V. Kuznetsova, E. V. Tretyakov, G. V. Romanenko, A. S. Bogomyakov, V. I. Ovcharenko & R. Z. Sagdeev

  2. G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 ul. Tropinina, 603950, Nizhny Novgorod, Russian Federation

    V. K. Cherkasov, M. P. Bubnov & G. A. Abakumov

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  1. E. Yu. Fursova
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  2. O. V. Kuznetsova
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  3. E. V. Tretyakov
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Dedicated to Academician V. N. Charushin on the occasion of his 60th birthday.

Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 791–797, May, 2011.

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Fursova, E.Y., Kuznetsova, O.V., Tretyakov, E.V. et al. Heterospin complexes based on cobalt semiquinolate with nitroxides. Russ Chem Bull 60, 809–815 (2011). https://doi.org/10.1007/s11172-011-0129-4

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