Versatility of Bis(2-pyridyl)ditellane

摘要

The different nature of the Te and N binding sites of bis(2- pyridyl)ditellane - oPy2Te2 - (1) in reactions with halogen, hydrohalic acids and a metal salt were explored in this work in order to obtain seven compounds: HoPyTeCl2 (2), HoPyTeBr2 (3), oPyTeI (4), HoPyTeI2 (5), HoPyTeI4 (6), MeoPyTeI2 (7), and [oPyTeCuCl]2 (8). The compounds were structurally characterized by X-ray diffraction, which revealed, in almost all of the compounds, the presence of hypervalent chalcogen adducts containing a formal negative charge located on the TeII or TeIV atom stabilized by the protonated (2, 3, and 5) and methylated (7) pyridyl group. Compound 4 has a dimeric structure built up by association of highly unstable monomeric ArTeX units (X= Cl, Br, I) through Te-N interactions while compound 8 is a binuclear coordination complex, in which 1 behaves as a tridentate ligand, with k2N2, Te8 coordination for one CuI ion and kN10 coordination for the other CuI ion.