Synthesis and Characterization of Complexes of Some Hydroxyaryltellurium Trichlorides with N-Donor Ugands

Abstract

Twenty new complexes of hydroxyaryltellurium trichlorides derived from isomeric cresols and ortrto-chlorophenol with pyridine (Py), 2, 2′-bipyridyl (Bipy) and piperidine (Pip) have been synthesized and characterized by elemental analyses, conductance, cryoscopy, infrared and proton magnetic resonance studies. Pyridine and piperidine form RTeCI₃.L and RTeCI₃.2L complexes, whereas 2, 2-bipyridyl which acts as a bidentate ligand and gives only RTeCI₃.L complexes. Conductance and cryoscopic measurements reflect their weak or 1:1 electrolytic behaviour in solution of nitrobenzene, acetonitrile and acetone. Spectral studies indicate the linkage of these ligand molecules to the tellurium atom of the hydroxyaryltellurium group through nitrogen atoms. A. square-pyramidal structure is suggested for RTeCI₃.Py and RTeCI₃.Pip, whereas 1:2 complexes of pyridine and piperidine along with RTeCI₃.Bipy, have octahedral stereochemistry.