922713-53-9Relevant academic research and scientific papers
Anionic tungsten carbonyl complexes containing dithiocarboxylate, dithiocarbamate, and xanthate ligands
Dilsky, Stefan,Schenk, Wolfdieter A.
, p. 570 - 576 (2008/01/27)
The reaction of Et4N[W(CO)5Cl] with sodium dithiobenzoate, ethylxanthate, or various dithiocarbamates gave the corresponding salts Et4N[W(CO)4(SSCX)] (X = Ph, NEt 2, N(H)t-Bu, NPh2, OEt) which contain the dithio ligand in a chelating bonding mode. Two of them (X = N(H)t-Bu, NPh2) were characterized by X-ray crystallography. The tungsten atom resides in the center of a slightly distorted octahedron surrounded by a symmetrically bidentate planar dithio ligand and four CO groups. Reaction with PPh3 or PMe3 at elevated temperature gave the tricarbonyl complexes Et 4N[W(CO)3(PR3)(SSCX)] and in one case a ring-opened addition product, Et4N[W(CO)4(PMe 3)(SC(S)OEt)]. For two of them X-ray structure determinations were carried out. A comparison of the four structures shows that while the W-C bond length decreases progressively with increasing electron density at the tungsten atom, the W-S and W-P bond lengths remain essentially constant.
