Synthesis and crystallographic characterization of cationic Pd(II) complexes containing bis(diphenylthiophosphinyl)methane

Abstract

The reactions of PdCI 2(L-L) [L-L = Ph 2PCH 2PPh 2 (dppm), Ph 2PCH 2CH 2PPh 2 (dppe) and Ph 2PCH 2CH 2CH 2PPh 2 (dppp)] with an equivalent amount of Ph 2P(S)CH 2P(S)Ph 2 (dppmS 2) gave the cationic complexes [Pd(L-L)(dppmS 2)] 2+ which were isolated as perchlorate salts [dppm ( 1), dppe ( 2) and dppp ( 3)]. The complexes 1 and 3 were crystallographically characterized. The coordination geometry around the Pd atoms in these complexes is distorted square planar. Both structures consist of puckered six-membered rings formed by coordination of the disulfide ligands via two sulphur atoms to the metal center. Complex 1 includes one molecule of acetone, [Pd(dppm)(dppmS 2)](ClO 4) 2 · (CH 3) 2CO ( 1a).