Layla N. Khasrou

The X-ray crystal structures of (O,O-2,3-dimethylbutylene and O,O-2-dimethylpropylene dithiophosphato)diphenyltellurium(IV) derivatives, Ph2Te[S2POCMe2CMe2O]2 and 2Ph2Te[S2POCH2CMe2CH2O]2·2Ph2TeCl2·CS2 and those of (O,O-2,3-dimethylbutylene and O,O-2-dimethylpropylene dithiophosphoric acids, HS2POCMe2CMe2O and HS2POCH2CMe2CH2O

Abstract The immediate environment about tellurium in Ph2Te[S2POCMe2CMe2O]2 (1) and 2Ph2Te[S2POCH2CMe2CH2O]2·2Ph2TeCl2·CS2 (2) is essentially that of a saw-horse structure in which the lone-pair is apparently stereochemically active and occupying an equatorial position in a distorted trigonal bipyramid. However, when the second sulfur atom of the unsymmetrical bidentate ligand is included in the coordination sphere, the arrangement about tellurium in compound 1 is better described as distorted octahedral and that in Ph2Te[S2POCH2CMe2CH2O]2 as distorted pentagonal pyramidal. An intermolecular association involving a chlorine atom of Ph2TeCl2 results in a pentagonal bipyramidal arrangement. Sulfur and chlorine bridges between the Te atoms of Ph2Te[S2POCH2CMe2CH2O]2 and Ph2TeCl2 indicate pseudo dimers or Te2S2Cl cages. The isolation of this mixed species rather than Ph2TeCl[S2POCH2CMe2CH2O] was most unexpected. There is no indication of hydrogen bonding in HS2POCMe2CMe2O (3) and HS2POCH2CMe2CH2O (4); even the shortest S–S internuclear distance, which is in compound 3, is 3.556(2) A. In both acids, the P–SH bond is significantly longer than the PS terminal bond.

The vibrational spectra of germane and silane derivatives—XI. Vibrational spectra and normal co-ordinate analyses of some thiogermanes

Abstract The i.r. and Raman spectra of the thiogermanes, (CH3)nH3-n, GeSCH3(n = 0–3) are reported and the fundamentals assigned. A normal co-ordinate analysis based on a modified valence force field supports the a priori assignments for all of the fundamental frequencies except the torsional modes.

Trimethylgermyl-methane and -trifluoromethane-sulfonates

Abstract Me3GeOS(O2)CH3 and Me3GeOS(O)2CF3 have been prepared and characterised by their 1H, 13C, 19F NMR, IR, Raman and mass spectra.