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Transmetallation of a binuclear complex of nickel(O). Synthesis and structure of [NiAu(CNMe)2(dppm)2]Cl

1988; Elsevier BV; Volume: 346; Issue: 2 Linguagem: Inglês

10.1016/0022-328x(88)80126-8

1872-8561

Heesook P. Kim, Phillip E. Fanwick, Clifford P. Kubiak,

Magnetism in coordination complexes

The metallation of Ni2(μ-CNMe)(CNMe)2(dppm)2 (1) (dppm = PPh2Ch2PPh2) with (PPh3)Au(Cl) affords the transmetallation product, [NiAu(CNMe)2(dppm)2]Cl (2) in 49% yield. The 31P NMR spectrum of 1 is an AA′BB′ spin system centered at δ- 39.2 ppm. An X-ray structural study of the title compound was undertaken. Complex 2 crystallizes in the monoclinic space group Pn with a 12.992(1) Å, b 11.760(1) Å, c 17.579(5) Å, β 109.36(2)°, V 2534(1) Å3, and Z = 2. The structure was refined to convergence leading to R and Rw of 0.020 and 0.025, respectively, for 3062 observations in the range 4° < 2θ 3.0 σ(I) and Mo-Kα radiation. The NiAu separation is 3.0146(9) Å suggesting there is not a significant NiAu interaction. The complex exhibits a cis-trans arrangement of the bridging dppm diphosphine ligands with essentially tetrahedral NiP2L2 (L = CNMe) and linear AuP2 centers.