Abstract
Reactions of Ni(II) and Mn(II) hexafluoroacetylacetonates with pyrazole-containing nitronylnitroxyl radicals (L) result in dimeric heterospin complexes [M(hfac)2L]2or [M(hfac)2L]2· C6H6. The paramagnetic ligands in the centrosymmetric binuclear molecules function as a bridge, with the nitroxyl O atom being bound to one metal and the imine N atom of the pyrazole ring to the other metal atom. The metal environment is a cis-octahedron with short M–ONOdistances, which specifies a strong antiferromagnetic interaction between the lone electrons of paramagnetic centers in M–O•–N< exchange clusters.
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Romanenko, G.V., Fokin, S.V., Vasilevskii, S.F. et al. Dimeric Complexes of Manganese(II) and Nickel(II) Hexafluoroacetylacetonates with Pyrazole-Containing Nitronylnitroxyl Radicals. Russian Journal of Coordination Chemistry 27, 360–367 (2001). https://doi.org/10.1023/A:1011354314831
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DOI: https://doi.org/10.1023/A:1011354314831