Synthesis, Spectroscopic Characterization, and Crystal Structure of the Bimetallic Complex [Ni2(μ-CO)(CO)2(μ-NH(PPh2)2)2]

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Abstract
The dinuclear Ni(0) complex [Ni2(μ-CO)(CO)2(μ-dppa)2] (1; dppa = bis(diphenylphosphino)amine) was synthesized by two routes in good yield. Complex 1 has a triclinic crystal system and P1̄ space group, with a = 13.009(1) Å, b = 13.063(2) Å, c = 14.664(2) Å, α = 79.91(1)°, β = 79.96(1)°, γ = 71.32(1)°, and Z = 2. The structure of this compound exhibits two μ-coordinated dppa ligands in a cis,cis arrangement. Nickel atoms are at a 2.5824(7) Å distance. Theoretical calculations predict a 0.39 bond order between metal atoms. The cyclic voltammograms show two quasi-reversible redox pairs, which correspond to the successive oxidation of the metal centers. The dinuclear complex described absorbs carbon monoxide, yielding a mixture of nickel carbonyl compounds.