Amido or Imido Tellurium Trichlorides

When tellurium tetrachloride was condensed with iV,iV,iV -tris[trimethylsilyl]benzamidine in dry dichloromethane, N,N -bis[trimethylsilyl]benzamidinyl tellurium trichloride was isolated in the form of white crystals that were characterized by single-crystal X-ray diffraction. The tellurium atom is surrounded by three chlorine and two nitrogen atoms in the monomeric molecule. 

A similar condensation between tellurium tetrachloride and A-trimethylsilyl(triphenyl) phosphane imide in toluene yielded triphenylphosphane imidyl tellurium trichloride as yellow crystals that were recrystallized from acetonitrile. In the solid state the molecule is dimeric containing a four-membered TejNj cycle with alternating short and long Te-N bonds  

Bis[dialkylamino] tellurium dihalides are moisture-sensitive liquids (R = C2H5) or solids. B. %[diethylamino tellurium difluoride decomposes at 20°. 

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