A series of novel tri-, tetra-and pentanuclear complexes composed of dinuclear LM 2 units (M=Co, Ni, Zn; L=24-membered macrocyclic hexaaza-dithiophenolate ligand) and ferrocene-carboxylate ([CpFeC 5 H 4 CO 2 ]ˉ), 1,1'-ferro-cenedicarboxylate([Fe(C 5 H 4 -CO 2 ) 2 ] 2ˉ) , acetylenedicarboxylate, terephthalate, isophthalate, and naphthalene diimide dicar-boxylate groups is reported. The complexes have been synthesized and characterised by UV/Vis-, IR-spectroscopy, and X-ray crystallography. Each

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... icarboxylate dianion acts as a quadridentate bridging ligand linking two bioctahedral LM 2 units via μ 1,3 -bridging carboxylate functions to generate discrete dications with a central LM 2 (O 2 C-R-CO 2 )M 2 L core. Scheme 3. Schematic representation of the two ligand conformations in the chloro-and carboxylato-bridged complexes of (L) 2-. For these conformational changes metal-ligand dissociations are required.