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Spin transition in the molecular heterospin complex of Cu(hfac)2 with 4,4,5,5-tetramethyl-2-(1-methylpyrazol-5-yl)-4,5-dihydroimidazole-1-oxyl 3-oxide

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Abstract

The synthesis, structure, and magnetic properties of the products of the reaction for Cu(hfac)2 (hfac is hexafluoroacetylacetonate) with spin-labeled nitronyl nitroxides 4,4,5,5-tetramethyl-2-(1-R-1H-pyrazol-5-yl)-3-imidazoline-1-oxyl 3-oxides L5/R (R = Me, Et, Pr, Bu), viz., binuclear complex [Cu(hfac)2L5/Me]2 and chain polymer complexes [Cu(hfac)2L5/R]n, are described. The polymer heterospin chains are built according to “head-to-head” (R = Me, Et, Pr, Bu) and “head-to-tail” (R = Pr, Bu) motifs. Compound [Cu(hfac)2L5/Me]2 is characterized by the ability to reveal the reversible effect of thermally induced spin transition at a temperature about 75 K (without hysteresis). In the set of heterospin CuII compounds with spin-labeled pyrazoles, this is the earlier unknown example of a molecular complex exhibiting a similar magnetic anomaly.

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Authors and Affiliations

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

    S. V. Fokin, E. T. Kostina, E. V. Tret’yakov, G. V. Romanenko, A. S. Bogomyakov, R. Z. Sagdeev & V. I. Ovcharenko

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  1. S. V. Fokin
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  2. E. T. Kostina
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  3. E. V. Tret’yakov
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  4. G. V. Romanenko
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  5. A. S. Bogomyakov
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  6. R. Z. Sagdeev
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  7. V. I. Ovcharenko
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Correspondence to S. V. Fokin.

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Dedicated to the Academician of the Russian Academy of Sciences I. P. Beletskaya on the occasion of her birthday.

Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 0660–0670, March, 2013.

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Fokin, S.V., Kostina, E.T., Tret’yakov, E.V. et al. Spin transition in the molecular heterospin complex of Cu(hfac)2 with 4,4,5,5-tetramethyl-2-(1-methylpyrazol-5-yl)-4,5-dihydroimidazole-1-oxyl 3-oxide. Russ Chem Bull 62, 661–671 (2013). https://doi.org/10.1007/s11172-013-0089-y

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  • DOI: https://doi.org/10.1007/s11172-013-0089-y

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