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

Abstract

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(κ1-mbm)2(PPh3)2] in which the mbm ligands bind through a sulfur atom. With dppf, a similar complex, [Pd(κ1-mbm)2(κ2-dppf)], is formulated with the mbm ligands being forced into a relative cis orientation. With dppm, a mixture of mononuclear [Pd(κ1-mbm)2(dppm)] and binuclear [Pd(κ1-mbm)2(μ-dppm)]2 results. The new complexes have been characterized by IR, 1H and 31P{1H} NMR, molar conductivity and elemental analysis, and in addition, the molecular structure of trans-[Pd(κ2-mbm)2(PPh3)2] was confirmed by X-ray diffraction.