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DOI: 10.1039/A605967H (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1997, 519-530

Stabilization of cobalt(I) by the tripodal ligands tris(2-pyridyl)methane and tris(2-pyridyl)phosphine. Structural, spectroscopic and ab initio studies of the [CoL2]n+ species

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Kenneth R. Adam, Peter A. Anderson, Timothy Astley, Ian M. Atkinson, John M. Charnock, C. David Garner, Jacqueline M. Gulbis, Trevor W. Hambley, Michael A. Hitchman, F. Richard Keene and Edward R. T. Tiekink

Abstract

The nature of bonding in a series of complexes [CoL2]n+ [L = the tripodal ligand tris(2-pyridyl)methane or tris(2-pyridyl)phosphine, n = 1–3] has been investigated by single-crystal X-ray diffraction, X-ray absorption and electronic spectroscopy and density functional theory ab initio calculations. The structural studies reveal that the cobalt ions each exist in a distorted octahedral geometry defined by six N-donor atoms; the cations are all centrosymmetric. In both series of complexes the bond lengths CoI–N ≈ CoII–N > CoIII–N. Data from the various studies indicate that the ‘cobalt(I)’ state of the complex [Co{X(C5H4N-2)3}2 ]+ (X = CH or P) is better described by the d8 cobalt(I)–ligand formulation rather than as d7 cobalt(II)–ligand radical.

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