Metal Complexes as Ligands Part 12
Synthesis and X-ray crystal structure of a hexanuclear nickel(II) complex based on two isosceles trinuclear components with imidazolate bridges
The new ligand H2L, derived from 5-chloro-2-hydroxybenzophenone, o-phenylenediamine, and imidazole-2-carbaldehyde, forms an insoluble, apparently polymeric nickel(II) complex, which can dissociate and act as a monodentate ligand via a ring nitrogen donor. It forms a 2:1 adduct with nickel hexafluoroacetylacetonate, Ni(hfacac)2, with a toluene molecule in the hollow of the V-shaped trinuclear fragment. The central nickel is octahedral with two hfacac ligands and two cis-bonded NiL complex ligands, to form an isosceles triangle of nickel atoms, of dimensions 5.754 × 5.783 × 6.407 Å. The overall structure is hexanuclear, consisting of two trinuclear subunits joined by two weak (2.908 Å) Ni-O links between NiL complex ligands. [(NiL)2Ni(hfacac)2]2·2C 6H5Me crystallizes in space group P1 with a = 16.044(6), b = 15.939(4), c = 14.971(9) Å, α = 78.33(4), β = 72.09(5), γ = 63.56(6)°, and Z = 1; R = 0.065 for 4 660 reflections.
T. Thanyasiri and E. Sinn, "Metal Complexes as Ligands Part 12," Journal of the Chemical Society, Dalton Transactions, Royal Society of Chemistry, Jan 1989.
The definitive version is available at https://doi.org/10.1039/DT9890001187
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© 1989 Royal Society of Chemistry, All rights reserved.