Bridging ability of a novel polydentate ligand (H₂L) comprising an oxime function. Structures of a mononuclear precursor [NiL] and a dinuclear Cu^II₂ complex. Magnetic properties of mononuclear (Ni^II and Cu^II), dinuclear (Cu^II₂, Ni^II₂, Ni^IICu^II and Cu^IICr^III) and trinuclear (Cu^II₃, Cu^IIMn^IICu^II and Cu^IIZn^IICu^II) complexes ‡

Abstract

A novel non-symmetrical polydentate Schiff base ligand 3-({2-[ (1-methyl-3-oxobut-1-enyl)amino]ethyl}imino)butan-2-one oxime (H₂L) comprising an oxime function among various donor sites yields neutral [Ni^IIL] and [Cu^IIL] complexes. The structural determination of [NiL] confirms the deprotonation of the oxime function. The deprotonated oxime oxygen atom can react with auxiliary complexes to give homo- and hetero-di- and tri-nuclear entities. The structural determination of a homodinuclear copper complex clearly shows the presence of the expected oxime bridge, along with an unexpected ketonic bridge between the two copper centres leading to a Cu[O,NO]Cu core. A moderate antiferromagnetic interaction is present in the di- and tri-nuclear copper complexes. A similar interaction is also observed in the heteronuclear complexes (Cu^IINi^II and Cu^IIMn^II) and, more surprisingly, in the heterodinuclear Cu^IICr^III entity. A generalization of the Cu[O,NO]Cu structure leads to a justification of these magnetic properties.

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