Cobalt(II) and nickel(II) complexes with the propylene-bridged tripod ligand tris-(3-dimethylaminopropyl)amine (donor set N4)
Abstract
The tripod ligand tris-(3-dimethylaminopropyl)amine (Me6tpt, donor set N4) has been synthesized. It forms high-spin cobalt(II) and nickel(II) complexes of general formula [M(L)X]BPh4(M = Co, Ni; X = Cl, Br, I). A tetrahedrally distorted trigonal bipyramidal structure is attributed in the solid state to both the cobalt(II) and nickel(II) complexes, which are isomorphous for any given halogen. A more regular five-co-ordinate structure is achieved by the nickel(II) complexes in solution, whereas the cobalt(II) complexes assume a pseudo-tetrahedral structure with N3X donor set in solvents of low polarity. A complex with formula [CoL](BPh4)2 has also been isolated: this is believed to contain a pseudo-tetrahedral [CoL]2+ cation. The critical steric requirements of the Me6tpt ligand, with respect to previously reported tetramine tripod ligands, are discussed.
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