[CpArNi{Ga(nacnac)}]: An Open-Shell Nickel(I) Complex Supported by a Gallium(I) Carbenoid (CpAr = C5(C6H4-4-Et)5, nacnac = HC[C(Me)N-(C6H3)-2,6-iPr2]2)

Zusammenfassung

The 17 valence electron (VE) open-shell nickel gallanediyl complex [(CpNi)-Ni-Ar{Ga(nacnac)}] (3, Ar = C-5(C6H4-4-Et)(5), nacnac = HC[C(Me)-N(C6H3-2,6-iPr(2))](2)), having an unsupported Ni-Ga bond, was synthesized from [(CpNi)-Ni-Ar(mu-Br)](2) (1) by reducing the adduct [(CpNi)-Ni-Ar(mu-Br){Ga(nacnac)}] (2) or, alternatively, trapping the "(CpNiI)-Ni-Ar" synthon with Ga(nacnac); spectroscopic and DFT studies showed that the single unpaired electron in 3 resides mainly at the Ni center.