PHOSPHORUS LONGITUDINAL RELAXATION-TIMES AS A PROBE OF THE COORDINATION SITE OF THE PHOSPHINE-LIGANDS IN RHENIUM COMPLEXES

P-31 relaxation in P-donor ligands bound to rhenium depends, at low fi elds, on (1)J(Re-P), and therefore is sensitive to the stereochemistry of the other ligands. The comparison of T-1's can be used as a probe of the coordination geometry of the P-ligands in the case of isomers o r when the ligands are bound differently to the same metal or (in poly nuclear compounds) bound to different metals, provided that these have the same coordination sphere.