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DOI: 10.1039/A803442G (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1998, 2657-2664

Heterobimetallic nickel–sodium and cobalt–sodium complexes of pyridonate ligands

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Euan K. Brechin, Liam M. Gilby, Robert O. Gould, Steven G. Harris, Simon Parsons and Richard E. P. Winpenny

Abstract

Seven new mixed-metal complexes have been prepared and their structures determined. Reaction of anhydrous nickel(II) chloride with Na(xhp) (xhp = 6-methyl- or 6-chloro-2-pyridonate, mhp or chp respectively) produced the discrete polynuclear complexes [Ni4Na4(mhp)12(Hmhp)2] 1 and [Ni2Na2(chp)2(H2O)(MeCN)4] 2, depending on the pyridonate derivative used. A closely related complex [Ni2Na2(chp)6(H2O)2(MeCN)4] 3 cocrystallised with 2 from a reaction scheme involving phenylacetate. A polymeric complex [{Ni2Na2(chp)6(H2O)}n] 4 can be isolated from a similar reaction to that which gave 2 but by recrystallisation from ethyl acetate rather than the co-ordinating solvent MeCN. The cobalt analogue of 4, [{Co2Na2(chp)6(H2O)}n] 5 was also prepared and a closely related cobalt–sodium polymer, [{Co2Na2(chp)6}n] 6, crystallised from ethyl acetate. A further polymer featuring the mhp ligand, [{Co2Na2(mhp)6(Hmhp)(H2O)}n] 7, was produced from reaction of anhydrous cobalt(II) acetate with Na(mhp) followed by recrystallisation from toluene. The structures of the molecular species 1, 2 and 3 can be rationalised as co-ordination of Na by [Ni(xhp)3]– ‘complex ligands’ in which the nickel centres are surrounded by three chelating pyridonates. In the polymeric species 4, 5, 6 and 7 the structures can be viewed as involving co-ordination of Na by [M2(xhp)6]2– complex ligands. In 6 the absence of any additional solvent molecules leads to interaction of the sodium site with Cl-donors.

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