Nuclear magnetic resonance studies on metal complexes. Part VIII. Phosphorus–phosphorus coupling constants and other n.m.r. data for some di-t-butylphosphine–transition-metal complexes

Abstract

Some new di-t-butylphosphine complexes of the types RuCl₂(CO)₂Q₂(two isomers), trans-MX(CO)Q₂, MCl₃-(CO)Q₂, and M′X₂Q₂(Q = PHBu^t ₂, X = halogen, M = Rh or Ir, M′= Ni, Pd, or Pt) are described. Several n.m.r. parameters including accurate values of ²J(P–M–P) have been calculated from the ¹H n.m.r. spectra of these complexes. The ¹H (t-butyl) resonance consists of a five-line pattern of relative intensities 2 : 1 : 2 : 1 : 2 when the two di-t-butylphosphines are mutually trans. Near- and far-i.r. data are given.