The different nature of the Te and N binding sites of bis(2pyridyl)ditellane -o Py 2 Te 2 -(1) in reactions with halogen, hydrohalic acids and a metal salt were explored in this work in order to obtain seven compounds: H o PyTeCl 2 (2), H o PyTeBr 2 (3), o PyTeI (4), H o PyTeI 2 (5), H o PyTeI 4 (6), Me o PyTeI 2 (7), and [ o PyTeCuCl] 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 Te II or Te IV 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 k 2 N 2 , Te 8 coordination for one Cu I ion and kN 10 coordination for the other Cu I ion.

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