Transition Metal Chemistry of Quinuclidinone-Containing Ligands. II. Spectral and Magnetic Properties of Some Transition Metal Complexes Containing 2-(n-morpholinylmethyl)-3-quinuclidinone and Related Ligands
Complexes of cobalt(II), nickel(II), and iron(II) halides with the title compound were prepared by adding the appropriate metal salt to the ligand in alcoholic solutions. The complexes have pseudotetrahedral microsymmetry around the central metal ion as indicated by their spectral and magnetic properties; the coordination sphere contains one bidentate nitrogen-bonded ligand and two halide atoms. Ligand field band assignments, metal-halide stretching frequencies, and magnetic susceptibility data are given for each of the complexes. The cobalt(II) and nickel(II) perchlorate complexes of the title compound were also prepared, and each contains two bidentate ligands which provide a tetrahedral ligand field that is stronger than for the halide complexes. It is suggested that the apparent preference of the ligand for one-to-one metal-to-ligand coordination and the consequent tetrahedral structures result from a combination of the size of the quinuclidine group and the rigidity of the five-membered chelate ring formed by the coordinated ligand. In addition to these pseudotetrahedral complexes, an octahedral nickel chloride complex which apparently contains bridging chloride ligands is reported. A cobaltous thiocyanate complex is also found to have an octahedral structure in the solid state and a tetrahedral structure in solution.
R. C. Dickinson and G. J. Long, "Transition Metal Chemistry of Quinuclidinone-Containing Ligands. II. Spectral and Magnetic Properties of Some Transition Metal Complexes Containing 2-(n-morpholinylmethyl)-3-quinuclidinone and Related Ligands," Inorganic Chemistry, vol. 13, no. 2, pp. 262-269, American Chemical Society (ACS), Feb 1974.
The definitive version is available at http://dx.doi.org/10.1021/ic50132a004
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