Transition Metal Chemistry of Quinuclidinone-Containing Ligands. III. Electronic and Structural Properties of Several Transition Metal Complexes Containing trans-2-(2'-Quinolyl)methylene-3-quinuclidinone
The complexes of the title ligand, Qnqn, with iron(II), cobalt(II), nickel(II), and copper(II) chloride and nickel(II) bromide have been prepared and characterized utilizing analytical, spectral, and magnetic techniques. In each case the compounds are found to be pseudotetrahedral in structure and to have M(Qnqn)X2 stoichiometry; the coordination sphere contains the two halide ions and the two Qnqn nitrogen donor atoms. Two isomeric complexes may be obtained with Qnqn and nickel(II) chloride. The yellow isomer is dimeric, [Ni(Qnqn)Cl2]2, with square-pyramidal coordination about the two nickel ions and the two bridging chloride ions between them. The violet isomer is pseudotetrahedral in structure. These two nickel isomers undergo a unique solid-state structural interconversion from the yellow isomer to the violet isomer at high temperature (ca. 230°) and from the violet isomer to the yellow isomer at low temperature (-78°).
G. J. Long and D. L. Coffen, "Transition Metal Chemistry of Quinuclidinone-Containing Ligands. III. Electronic and Structural Properties of Several Transition Metal Complexes Containing trans-2-(2'-Quinolyl)methylene-3-quinuclidinone," Inorganic Chemistry, vol. 13, no. 2, pp. 270-278, American Chemical Society (ACS), Feb 1974.
The definitive version is available at https://doi.org/10.1021/ic50132a005
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