Organotellurium(IV) Compounds Containing Symmetric Imidobis(Diphenylphosphinechalcogenide) Ligands

Abstract

The following compounds [C₄H₈Te(Ph₂(S)PNP(S)Ph₂)₂] (1), [C₄H₈Tel(Ph₂(S)PNP(S)Ph₂)] (2), [C₈H₈Tel(Ph₂(S)PNP(S)Ph₂)] (3), [C₄H₈Tel(Ph₂(Se)PNP(Se)Ph₂)] (4), and [(C₄H₈TeOTeC₄H₈)₂(Ph₂(O)PNP(O)Ph₂)₂][I, I₃] (5) were isolated from the reaction of C₄H₈Tel₂ or C₈H₈Tel₂ with the appropriate M[Ph₂(X)PNP(X)Ph₂] (M= K or Na; X= O, S and Se) salt. The compounds have been characterized by IR, multielemental NMR spectroscopy, positive-ion FAB mass spectrometry and elemental analysis. Compounds 1,3,4 and 5 were also characterized by single-crystal X-ray diffraction analysis. The sulfur and selenium ligands display an asymmetrical chelating coordination mode on interaction with the tellurium center, while two oxygen ligands behave as bridges between two C₄H₈Te-O-TeC₄H₈ units, leading to a 16-membered ring.

Keywords::

• Tellurium(IV)
• Imidodiphosphinechalcogenide ligands
• Metallacycles