P-31-NMR MEASUREMENTS ON PALLADIUM-PHOSPHINE COMPLEXES - NUCLEAR OVERHAUSER EFFECTS AND SPIN-LATTICE RELAXATION-TIMES

The 31P{1H} nuclear Overhauser effects (NOE's) and 31P‐spin‐lattice relaxation times (T1) for a series of trans‐[PdCl2P2], P  PEt3, PPr3n, PBu3n, PMe2Ph, PMePh2, P(p‐Tol)3, P(cyclohexyl)3 complexes are reported. Both the NOE and T1 values depend upon the choice of solvent. The dipole‐dipole mechanism dominates the spin‐lattice relaxation of the coordinated phosphorus atom with the T1 values for the PEt3, PPr3n, and P (cyclohexyl)3 complexes decreasing with increasing molecular weight of the phosphine. Copyright © 1979 Verlag GmbH & Co. KGaA, Weinheim