Chemistry Journal of Moldova

DOI: dx.doi.org/10.19261/cjm.2013.08(1).08

Graphical Abstract: A series of novel tri-, tetra- and pentanuclear complexes composed of dinuclear LM units (M=Co, Ni, Zn; L=24-membered macrocyclic hexaaza-dithiophenolate ligand) and ferrocenecarboxylate ([CpFeC₅H₄CO₂]ˉ), 1,1’-ferrocenedicarboxy-late ([Fe(C₅H₄-CO₂)₂]^2ˉ), acetylene-dicarboxylate, terephthalate, isophthalate, and naphthalene diimide dicarboxylate groups is reported. The complexes, have been synthesized and characterised by UV/Vis-, IR-, NMR-spectroscopy, Cyclovoltammetry, and X-ray crystallography. Each dicarboxylate dianion acts as a quadridentate bridging ligand linking two bioctahedral LM₂ units via µ_1,3-bridging carboxylate functions to generate discrete dications with a central LM₂(O₂C-R-CO₂)M₂L core. The magnetic properties of these compounds reveal the presence of weak ferromagnetic exchange interactions between the Ni^II ions of the dinuclear subunits and negligible coupling across the dicarboxylate bridges.