Ethylene[bis(tri-o-tolyl phosphite)]nickel(0)

Article abstract of DOI:10.1021/ic50092a031

The preparation and properties of ethylene[bis(tri-o-tolyl phosphite)]nickel(0) are described. The ethylene appears in the proton nmr spectrum at τ 8.06, 3.3 ppm to high field of free C₂H₄. The v(C=C) of ethylene in the complex was observed in the Raman spectrum at 1487 cm^-1, 136 cm^-1, lower than that of free C₂H₄. Spectrophotometric measurements show that addition of tri-o-tolyl phosphite to a solution of the ethylene complex rapidly converts it to tris- and tetrakis(tri-o-tolyl phosphite)nickel complexes. The equilibrium constant K₁, to give the tris-phosphite complex via the reaction (C₂H₄)-NiL₂ + L ?^K1NiL₃ + C₂H₄, has a value of 6.8 ± 0.5 × 10^-3 in benzene at 28°.