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

E.K. Brechin, L.M. Gilby, R.O. Gould, S.G. Harris, S. Parsons, R.E.P. Winpenny

Research output: Contribution to journalArticlepeer-review

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 [NiNa(mhp)(Hmhp)] 1 and [NiNa(chp)(HO)(MeCN) ] 2, depending on the pyridonate derivative used. A closely related complex [NiNa(chp)(HO) (MeCN)] 3 cocrystallised with 2 from a reaction scheme involving phenylacetate. A polymeric complex [{NiNa(chp)(HO)}] 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, [{CoNa(chp)(HO)}] 5 was also prepared and a closely related cobalt-sodium polymer, [{CoNa(chp)}] 6, crystallised from ethyl acetate. A further polymer featuring the mhp ligand, [{CoNa(mhp)(Hmhp)(HO)} ] 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)] '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 [M(xhp)] complex ligands. In 6 the absence of any additional solvent molecules leads to interaction of the sodium site with Cl-donors.
Original languageEnglish
Pages (from-to)2657-2664
Number of pages8
JournalDalton Transactions
Issue number16
DOIs
Publication statusPublished - 21 Aug 1998

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