The synthesis and structural characterisation of a series of cobalt and nickel cages are reported. Eight of these structures contain a [M10(3-OH)6(2, 3-xhp)6(2, 2-O2CR)6]2+ core (where M=Co or Ni; xhp=6-chloro- or 6-methyl-2-pyridonate; R=Me, Ph, CHMe2, CH2Cl, CHPh2 or CMe3), 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/and 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 Ni12, Ni11 and Ni10 cages, respectively.
A Family of Polynuclear Cobalt and Nickel Complexes Stabilised by 2-Pyridonate and Carboxylate Ligands / C. BENELLI; BLAKE A. J.; BREKIN E. K.; COLES S. J.; GRAHAM A.; HARRIS S. G.; MEIER S.; PARKIN A.; PARSONS S.; SEDDON A. M.; WINPENNY R. E. P.. - In: CHEMISTRY-A EUROPEAN JOURNAL. - ISSN 0947-6539. - STAMPA. - 6:(2000), pp. 883-896. [10.1002/(SICI)1521-3765(20000303)]
A Family of Polynuclear Cobalt and Nickel Complexes Stabilised by 2-Pyridonate and Carboxylate Ligands
BENELLI, CRISTIANO;
2000
Abstract
The synthesis and structural characterisation of a series of cobalt and nickel cages are reported. Eight of these structures contain a [M10(3-OH)6(2, 3-xhp)6(2, 2-O2CR)6]2+ core (where M=Co or Ni; xhp=6-chloro- or 6-methyl-2-pyridonate; R=Me, Ph, CHMe2, CH2Cl, CHPh2 or CMe3), 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/and 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 Ni12, Ni11 and Ni10 cages, respectively.
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