Binuclear manganese(III) complexes of an unsymmetric pyrazolate-based compartmental ligand with hard donor set

Abstract: The synthesis, crystal structure and magnetic properties of manganese(III) binuclear complexes [MnIII 2(L–3Н)2(CH3ОH)4]·2CH3ОH (1) and [MnIII 2(L–3Н)2(Py)4]·2Py (2) (L =3-[(1E)-N-hydroxyethanimidoyl]-4-methyl-1H-pyrazole-5-carboxylic acid) are reported. The ligand contains two distinct donor compartments formed by the pyrazolate-N and the oxime or the carboxylic groups. The complexes were characterized by X-ray single crystal diffraction, revealing that both 1 and 2 consist of dinuclear units in which the two metal ions are linked by double pyrazolate bridges with a planar {Mn2N4} core. Cryomagnetic measurements show antiferromagnetic interaction with g =1.99, J =−3.6cm−1, Θ =−2.02K for 1 and g =2.00, J =−3.7cm−1, Θ =1.43K for 2. [ABSTRACT FROM AUTHOR]