ChemInform Abstract: Synthesis, NMR Study, and Crystal Structures of Bis(diethyldithiocarbamato)(O,O′-diethyl dithiophosphato)phenyltellurium(IV), PhTe(S2CNEt2)2(S2P(OEt)2), and Bis(diethyldithiocarbamato)iodomethyltellurium(IV), MeTe(I)(S2CNEt2)2.

ChemInform Abstract

Reactions of PhTeCl₃ (I) with the dithiolate ligands (II), (IV), and SSCOEt- in solution are studied by variable-temp. 125Te, ³¹P, and ¹³C NMR spectroscopy, which show the formation of a variety of mixed-ligand species; some are subsequently isolated, such as (III) and (V). The second title compound (VIII) formed by oxidative addition of MeI (VII) to (VI) also provided a useful pathway to the synthesis of mixed-ligand species, but in general the products are less stable than the phenyl analogues. Solvent-dependent intramolecular exchange processes are observed for the alkyl and aryl series. The structures of the compounds (V) (space group P1, Z=2) and (VIII) (Pbca, Z = 8) are determined by X-ray analysis. Both compounds show evidence of stereochemically active lone pairs of electrons at Te producing eight- and seven-coordinated geometries, respectively.