The Influence of Steric and Electronic Effects Upon the Stereochemistry of Group VIII Metal Complexes

  • A. B. P. Lever
Conference paper


Complexes of Iron, Cobalt and Nickel occur in a variety of stereo-chemistries. Nickel(II) is particularly interesting in that apparently small differences in the nature of the ligands around the metal ion can alter the preferred stereochemistry. Much of the published work in this connection has dealt with substituted salicylaldimines (1) and substituted phosphines (2). Some of the factors responsible for the variations in stereochemistry are discussed briefly below. It is proposed that electronic distortion which may lead to changes in stereochemistry occurs when dissimilar ligands are bonded to the metal ion. This distortion may be detected by magnetic and/or spectral studies, but not necessarily by crystallographic studies. This is well known with ions such as Co(III), but there has been little extension previously to nickel compounds. The Table illustrates the stereochemical variations occurring in amine nickel complexes when the halogen is changed and also indicates how such parameters as the magnetic moment, crystal field energy and Racah parameter vary.


Coordination Polyhedron Tetragonal Distortion Ligand Atom Racah Parameter Bromo Pyridine 
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Copyright information

© Springer-Verlag Wien 1964

Authors and Affiliations

  • A. B. P. Lever
    • 1
  1. 1.Department of Chemistry, Faculty of TechnologyUniversity of ManchesterUK

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