Nickel complexes with a O,N,O′-ligand and a phosphane co-ligand – Monometallic versus bimetallic complexes

• The coordination chemistry of precursor 1 towards nickel and DPPM was studied.
• A monometallic nickel complex 2 [Ni(1–2H)(DPPM)] was obtained.
• A bimetallic complex [Ni(1–2H)(DPPM)Ni(1–2H)] was obtained by addition of Fe2(CO)9.
• The analytical features of 2 and 3 were discussed.

The coordination chemistry of 5-hydroxypyrazoline ligand precursor 1 with Ni(OAc)2·4H2O and 1,1-bis(diphenylphosphino)methane (DPPM) as co-ligand to form the monometallic nickel complex 2 [Ni(1–2H)(DPPM)] was studied. The complex was characterized and investigated by various techniques, pointing out a square planar geometry at the nickel center with η1-coordination of the DPPM ligand. Moreover, addition of Fe2(CO)9 revealed the formation of the bimetallic complex 3 [Ni(1–2H)(DPPM)Ni(1–2H)] with DPPM as bridging ligand between two nickel centers and the abstraction of one DPPM ligand by the iron to form Fe(CO)4(η1-dppm).

Nickel Complexes with a O,N,O′-ligand and a phosphane co-ligand – monometallic versus bimetallic complexes.Figure optionsDownload as PowerPoint slide