Claudio Santini

Synthesis and structure of new arylnickel(II) malonato-complexes

SummaryInteraction of malonate anions with chloro(aryl)bis(organophosphine)nickel(II) complexes leads to the formation of stable (aryl)(malonato)(organophosphine)nickel(II) species, as shown by i.r. and1H n.m.r. data. The crystal and molecular structure of (diethylmalonato-O,O)(α-naphthyl)(triphenylphosphine)nickel(II), determined by x-ray methods (space group P¯1,a=10.767(9),b=16.253(16),c=9.835(13)Å, α=108.97(10)0, β=106.08(10)0, γ=89.11(7)0,Z= 2;R= 0.070 for 3650 independent observed reflections), shows distorted square-planar O2PC coordination about the nickel with bond distances: Ni-P, 2.142(2)Å; Ni-O, 1.888(5) and 1.936(5)Å; Ni-C, 1.887(8)Å. The parameters and bonding of the triphenylphosphine-nickel and naphthyl moieties in the complex are normal, whereas considerable electron-delocalisation occurs in the planar ethylmalonate moiety. The σ-naphthyl ligand is oriented almost perpendicularly to the NiO2CP core-malonate plane.