Phosphorus–fluorine compounds. Part XVIII. Some N.m.r. observations on tetrakis(fluorophosphine) and mixed fluorophosphine–carbonyl complexes of nickel(O)

Abstract

Partial analyses of the ¹⁹F n.m.r. spectra of NiL₄ complexes (where L = PF₃, CF₃PF₂, (CF₃)₂PF, CCl₃PF₂, CH₂CIPF₂, Me₂NPF₂, and C₆H₄O₂PF) yields values for the coupling constants ¹J_PF, ³J_PF, ²J_PP, and ⁴J_FF. The low values of ²J_PP are related to molecular orbital energies. N.m.r. parameters for compounds of the type NiL_n′(CO)_4–n are tabulated [L′= Me₂NPF₂, Et₂NPF₂, C₅H₁₀NPF₂, and (Me₂N)₂PF.].