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Abstract <p>Structures of new heterospin cobalt(II) hexafluoroacetylacetonate complexes (Co(hfac)<sub>2</sub>) with stable nitronylnitroxyl radicals containing 1-methyl-3-trifluoromethyl- (L<sup>1</sup>), 1-ethyl-3-trifluoromethyl- (L<sup>2</sup>), or 1-ethyl-5-trifluoromethylpyrazol-4-yl substituents (L<sup>3</sup>) are considered. It is shown that the interaction of Co(hfac)<sub>2</sub> with L<sup>1</sup> and L<sup>2</sup> yields a new type of heterospin complexes with the [Co(hfac)<sub>2</sub>(L)<sub>2</sub>] stoichiometry, where L is coordinated by the oxygen atom of the nitronyl nitroxide fragment. The interaction with L<sup>3</sup> yields a dimeric complex [Co(hfac)<sub>2</sub>(L<sup>3</sup>)]<sub>2</sub> with paramagnetic ligands performing a bidentate-bridging function due to the coordination of imine N atoms of the pyrazole ring and O atoms of the paramagnetic moiety. Magnetic behavior of [Co(hfac)<sub>2</sub>(L)<sub>2</sub>] complexes indicates an antiferromagnetic interaction between the cobalt ion and coordinated nitronyl-nitroxide groups.</p>

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Co(II) Complexes with CF3 Derivatives of Pyrazolyl Substituted Nitronilnitroxyls

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • S. V. Fokin,
  • G. V. Romanenko,
  • K. A. Smirnova,
  • A. S. Bogomyakov,
  • A. A. Serykh,
  • E. V. Tretyakov

摘要

Abstract

Structures of new heterospin cobalt(II) hexafluoroacetylacetonate complexes (Co(hfac)2) with stable nitronylnitroxyl radicals containing 1-methyl-3-trifluoromethyl- (L1), 1-ethyl-3-trifluoromethyl- (L2), or 1-ethyl-5-trifluoromethylpyrazol-4-yl substituents (L3) are considered. It is shown that the interaction of Co(hfac)2 with L1 and L2 yields a new type of heterospin complexes with the [Co(hfac)2(L)2] stoichiometry, where L is coordinated by the oxygen atom of the nitronyl nitroxide fragment. The interaction with L3 yields a dimeric complex [Co(hfac)2(L3)]2 with paramagnetic ligands performing a bidentate-bridging function due to the coordination of imine N atoms of the pyrazole ring and O atoms of the paramagnetic moiety. Magnetic behavior of [Co(hfac)2(L)2] complexes indicates an antiferromagnetic interaction between the cobalt ion and coordinated nitronyl-nitroxide groups.