Synthesis and structural characterization of chalcogenido-bridged trinuclear palladium(II) dialk ldithiophosphates, [ Pd3( μ3- E) 2 {S 2(OR) 2} 2(PR 3′) 2] (E = S or Se, R = Et, Pr n, Pr i, Bu s and R′ = Ph, Et)

Abstract

Reaction of [PdCl{S 2P(OR) 2}(PR′3)] with sodium sulfide or selenide in acetone afforded neutral trinuclear palladium(II) complexes of the type [Pd 3(μ 3-E) 2{S 2P(OR) 2} 2(PR′ 3) 2] (E = S or Se; R = Et, Pr n Pr i , Bu s , R′ = Et or Ph) in 24–42% yield. These complexes were characterized by elemental analysis, NMR ( 1H, 31P, 77Se) and FAB mass spectral data. The molecular structure of [Pd 3( μ 3-S) 2{S 2P(OEt) 2} 2(PPh 3) 2] ( 1) was determined by X-ray diffraction. The molecule consists of three distorted square-planar palladium atoms sharing two μ 3-S ligands. One of the palladium atoms is linked with two triphenylphosphine ligands while each of the remaining two palladium atoms is coordinated with chelating dithiophosphate group.