Palladium(II) 2-mercaptobenzamide (o-SC6H4CONH2) complexes: Crystal structure of trans-[Pd(o-SC6H4CONH2)2(PPh3)2]

The reaction of [Hg(mbm)(2)] (mbm = o-SC6H4CONH2) with Na2S releases Na[mbm] which reacts with Pd(II) salts to give [Pd(mbm)(2)]. While its precise molecular structure is unknown, [Pd(mbm)(2)] reacts with two equivalents of PPh3 to afford trans-[Pd(kappa(1)-mbm)(2)(PPh3)(2)] in which the mbm ligands bind through a sulfur atom. With dppf, a similar complex, [Pd(kappa(1)-mbm)(2)(kappa(2)-dppf)], is formulated with the mbm ligands being forced into a relative cis orientation. With dppm, a mixture of mononuclear [Pd(kappa(1)-mbm)(2)(dppm)] and binuclear [Pd(kappa(1)-mbm)(2)(mu-dppm)](2) results. The new complexes have been characterized by IR, H-1 and P-31{H-1} NMR, molar conductivity and elemental analysis, and in addition, the molecular structure of trans-[Pd(kappa(2)-mbm)(2)(PPh3)(2)] was confirmed by X-ray diffraction.