Formation of donor-acceptor complexes of bis(acetylacetonato)-nickel(II) with phosphine and phosphite ligands in acetonitrile

Abstract

1. Electrochemical methods, spectrophotometry, and conductometry were used for the first time to demonstrate the capacity of nickel to coordinate trivalent phosphorus ligands (phosphines and phosphites) in acetonitrile as bis(acetylacetonato)nickel(Il). 2. Stepwise complexation of σ-donor-acceptor molecular and cationic complexes [NiL4]2+ occurs with a shift in the “coordination-dissociation” equilibrium of the excess concentration of the organophosphorus ligand in solution.