Metal Complexes as Ligands Part 12

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