Dimeric Complexes of Manganese(II) and Nickel(II) Hexafluoroacetylacetonates with Pyrazole-Containing Nitronylnitroxyl Radicals

摘要: 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 the centrosymmetric binuclear molecules function as a bridge, nitroxyl O atom being bound to one metal imine N pyrazole ring other atom. environment is cis-octahedron short M–ONOdistances, which specifies strong antiferromagnetic interaction between lone electrons centers M–O•–N< exchange clusters.