A family of polynuclear cobalt and nickel complexes stabilised by 2-pyridonate and carboxylate ligands

A.J. Blake, E.K. Brechin, A. Graham, S.G. Harris, S. Meier, A. Parkin, S. Parsons, A.M. Seddon, R.E.P. Winpenny, C. Benelli, S.J. Coles

Research output: Contribution to journalArticlepeer-review

Abstract

The synthesis and structural characterisation of a series of cobalt and nickel cages are reported. Eight of these structures contain a [M(μ-OH)(η, μ-xhp)(η, μ-OCR)] core (where M = Co or Ni; xhp = 6-chloro- or 6-methyl-2-pyridonate; R = Me, Ph, CHMe, CHCl, CHPh or CMe), where the ten metal atoms describe a centred-tricapped-trigonal prism (ttp). The cage contains six hydroxide ligands around the central metal, and the exterior is coated with pyridonate and carboxylate ligands. For four of the cages additional metal centres are found attached to the upper and/or lower triangular faces of the trigonal prism, generating dodeca-and undecanuclear cages. Three further cages are reported that contain a metal core based on an incomplete centred-tetraicosahedron. These cages involve trimethylacetate as a ligand in company with either 6-methyl-2-pyridonate or 6-chloro-2-pyridonate. Comparison of these latter structures with the trigonal prisms reveal that they can be described as a pentacapped-trigonal prism missing one edge. Magnetic studies of three of the nickel cages with trigonal prismatic cores show spin ground states of S = 8, 4 and 2 for Ni, Ni and Ni cages, respectively.
Original languageEnglish
Pages (from-to)883-896
Number of pages14
JournalChemistry - A European Journal
Volume6
Issue number5
DOIs
Publication statusPublished - 3 Mar 2000

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