Deka, Rajesh, Sarkar, Arup, Butcher, Ray J., Junk, Peter C., Turner, David R., Deacon, Glen B., and Singh, Harkesh B. (2020) Isolation of the novel example of a monomeric organotellurinic acid. Dalton Transactions, 49 (4). pp. 1173-1180.

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Abstract

The stoichiometrically controlled alkaline hydrolysis of 4, (ppy)TeCl3, [ppy = 2-(2'-pyridyl)phenyl] afforded the partially hydrolyzed mu-oxo-bridged dinuclear telluroxane 5, [(ppyTeCl(2))(2)(mu-O)] and a novel example of an Intramolecular Chalcogen Bonding (IChB) stabilized, monomeric organotellurinic acid 6, (ppy)Te(O)OH. The oxidation of diaryl ditelluride 7, (ppyTe)(2) using H2O2 resulted in the isolation of mu-oxo-bridged dimethyl ester 8, [(ppy)Te(O)(OH)(OMe)](2)(O). The molecular structures of 4-6 and 8 are unambiguously authenticated by single crystal X-ray diffraction studies. The electronic structure of monomeric tellurinic acid 6 is investigated using DFT calculations. The Natural Bond Order (NBO) analysis, in corroboration with Atoms in Molecules (AIM) analysis reveals that tellurinic acid 6 is stabilized by sigma-hole participation of the tellurium atom with the pyridyl N-atom resulting in strong electrostatic interactions between the N and Te atoms.

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