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Issue 0, 1968
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Five-co-ordination with ‘hybrid’ ligands. Part IV. Cobalt(II) and nickel(II) complexes with terdentate ligands containing phosphorus and nitrogen or sulphur as donor atoms

Abstract

The terdentate ligand bis-(2-diphenylphosphinoethyl)amine (I) and the related N-alkyl-substituted ligands where the alkyl group is either methyl (II) or cyclohexyl (III) have been synthesised. Theygive with nickel (II) halides complexes of general formulas NiLX2(L = I, II, or III; X = Br, l), [NiLX]2[NiX4](L = I or II; X = Cl, Br), and [NiLX]B(C6H5)4(L =C; X = Cl, Br, l). With cobalt(II) halides, complexes of general formula CoLX2(L = I, II, or III; X = Br, l) have been obtained. The nickel complexes are either low-spin five-co-ordinate or square-planar, depending on the bulkiness of the R group, but in solution they give only square-planar species [NiLX]+. The stereochemistry of the cobalt complexes changes from five-co-ordinate to tetrahedral with increasing bulkiness of the R group. Some similar complexes with the already known bis(diphenylphosphinoethyl) sulphide ligand have also been characterized.

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Article type: Paper
DOI: 10.1039/J19680002997
Citation: J. Chem. Soc. A, 1968, 2997-3002
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    Five-co-ordination with ‘hybrid’ ligands. Part IV. Cobalt(II) and nickel(II) complexes with terdentate ligands containing phosphorus and nitrogen or sulphur as donor atoms

    L. Sacconi and R. Morassi, J. Chem. Soc. A, 1968, 2997
    DOI: 10.1039/J19680002997

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