Dimethyl tellurium (IV) derivatives: synthesis, spectroscopic characterisation and structures of Me 2TeBr 2 and Me 2Te(OCOC 6H 5) 2

Abstract

The comparative solution 1H-NMR spectra and solid state crystal structures of dimethyltellurium dihalides, Me2TeX2 (X=CI, Br, I) are described. The dimethyltellurium dicarboxylates, Me2TeX′2 (X′=OCOC6H5, OCOCH3, OCO) were obtained from the reactions of Me2TeI2 with silver carboxylates. They were characterised by IR, 1H- and 13C-NMR spectroscopy. The structures of Me2TeBr2 and Me2Te(OCOC6H5)2 were established by single crystal X-ray diffraction studies. Both possess immediate distorted trigonal bipyramidal geometries with a stereochemically active electron lone pair and the latter contains weak intermolecular C–H⋯O interactions.