Oligonuclear nickel(II) complexes of asymmetric compartmental ligands bearing adjacent {N2O} and {N,S,O} donor sets

The generation of a trinuclear cobalt (II) core supported by differing tridentate acetate bridges

“…Co(1) and Co (2) are bridged by a cresolic O atom and by the syn-anti bidentate O atoms from a l 3 -acetatojO;jO;jO 0 -bridge. Co (2) and Co (3) are bridged by both of the acetates. Each acetate acts as a tridentate ligand.…”

“…Chelation from the pendant nitrogen atoms provides six-membered chelate rings from the aminic arms to the Ni atoms in both complexes and the six-coordination of the nickel(II) atoms is completed by an isothiocyanato-N atom at Ni (2) in complex 2 and by methanolic-O atoms at both Ni atoms in 3. All of the Ni atoms have a distorted octahedral coordination geometry.…”

“…We have recently established that the reaction of M(OAc) 2 , M ¼ Ni(II), Co(II) and Mn(II) with potentially tetradentate unsymmetrical Schiff base compartmental proligands HL 1 provides the trinuclear M(II) complexes [M 3 (L 1 ) 2 (OAc) 2 (NCS) 2 ] [1][2][3]. The metal in the donor-diminished compartment of the ligand achieves six-coordination by interaction with the donor atoms of the donor-diminished compartment of a second ligand molecule and of the l 3 -acetato-jO;jO;jO 0 -bridges ( Fig.…”

The assembly of oligonuclear nickel(II) complexes from asymmetric compartmental ligands in the presence of alkali metal salts

“…1), generate the homotrinuclear nickel(II) complexes [Ni 3 (L 1 ) 2 (OAc) 2 (NCS) 2 ] in which the metallic core is supported by two l 3 -acetatojO:jO:jO 0 groups [1][2][3]. Oligonuclear 3d-metal clusters derived from O-and N-donor ligands are currently of interest because of their magnetic properties [4] and the above homotrinuclear clusters have been shown to exhibit antiferromagnetic properties [5].…”

The assembly of pentanuclear nickel(ii) complexes from asymmetric compartmental ligands and bearing μ3-OH bridges

“…, in each of which the pendant S-donor atom is non-coordinating and there are again two tridentate acetate bridges. 7 Reduction of the denticity of the dinucleating ligand from potentially pentadentate to potentially tetradentate generates vacant coordination sites at the metal incorporated into the donor atom diminished iminic compartment and provides an opportunity for the generation of a complex with enhanced nuclearity via interaction with the same donor set from a second ligand molecule. High nuclearity 3d-metal clusters derived from O-and N-donor ligands are currently of interest because of their magnetic properties.…”