| Summary: | The synthesis, structure and physical properties of several novel multinuclear cobalt complexes of substituted 2-pyridones are reported. Reaction of cobalt(II) salts and the anion of 6-chloro-2-pyridone results in the formation of a trinuclear structure which has been characterised by X-ray crystallography and contains a linear array of the three metals. With the 6-methyl derivative of 2-pyridone, two compounds were isolated, a heterobimetallic polymer of cobalt and sodium in which the metal centres are bridged by chelating pyridone ligands and a mononuclear complex containing two chelating ligands. Both have been characterised by X-ray crystallography. A range of similar complexes are synthesised of formula Co(<I>x</I>hp)<SUB>2</SUB>L<SUB>2</SUB>, <I>x</I>hp = mhp, chp, fhp and hp and L<SUB>2</SUB> = 2,2'-bipyridyl, 4,4'-dimethyl-2,2'-bipyridyl or 1,10-phenanthroline. The synthesis of a dinuclear complex of 6-bromo-2-pyridone is reported and characterised by X-ray crystallography. Magnetic studies on this compound show an antiferromagnetic coupling between the two metals at low temperature. The physical properties of these compounds have been studied and the results are discussed. The studies include, NMR spectroscopy, electrochemistry and magnetic measurements. The synthesis and structure of a novel two-dimensional polymer containing cobalt and sodium bridged by acetate ligands is reported along with the attempted syntheses of mixed metal complexes containing cobalt and a lanthanoid from trinuclear cobalt complexes. Detailed descriptions of all structurally characterised compounds are given with regard to the metal environments, arrangements of ligands and packing motifs. Comparisons of these new structures with known copper complexes are made.
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