Polynuclear transition metal complexes of meta center dot center dot center dot metal-bridging compartmental pyrazolate ligands

Abstract

The present article reviews the structures and properties of di-, oligo- and polynuclear transition metal complexes of substituted pyrazolate (pz) ligands with ligating side arms (D(n)) in which the N(2)-unit of the pyrazole ring acts as a bridge between two metal centres. Extensive literature surveys covering the literature until the beginning of 2008 of symmetrical 3,5-disubstituted ligands of the type D-pz-D-, D(2)-pz-D(2)- and D(3)-pz-D(3) with uni-, bi-and terdentate side arms, respectively, as well as of unsymmetrical 3,5-disubstituted ligands of the type D(n)(1)-pz-D(m)(2). are presented together with a comprehensive survey of the structurally characterised complexes thereof. Catalytic and/or stoichionnetric reactions of the dinuclear systems are discussed where appropriate. (C) 2009 Elsevier B.V. All rights reserved.