American Chemical Society
Browse
om960416e_si_001.pdf (608.51 kB)

Dicationic Nickel(II) Carbonyl Complexes Containing Tetradentate Ligands

Download (608.51 kB)
journal contribution
posted on 1996-11-26, 00:00 authored by Alex Miedaner, Calvin J. Curtis, Sheryl A. Wander, Patricia A. Goodson, Daniel L. DuBois
This article describes the preparation and spectroscopic characterization of three dicationic Ni(II) carbonyl complexes containing tripodal tetradentate ligands. An X-ray diffraction study of [Ni(PP3E)(CO)](BF4)2 (where PP3E is tris(2-(diethylphosphino)ethyl)phosphine) has been completed and confirms a trigonal bipyramidal structure with an apical carbonyl ligand. The binding of CO is weak and reversible. The stability of these complexes is enhanced by the small chelate bite imposed by the tetradentate ligands. The electrochemical behavior of these complexes depends on the nature of the donor atom trans to CO. The [Ni(NP3E)(CO)]2+ (where NP3E is tris(2-(diethylphosphino)ethyl)amine) cation undergoes two reversible one-electron reductions, whereas the corresponding tetraphosphine cations undergo irreversible two-electron reductions.

History