New Series of Intramolecularly Coordinated Diaryltellurium Compounds. Rational Synthesis of the Diarylhydroxytelluronium Triflate [(8-Me2NC10H6)2Te(OH)](O3SCF3)

The reaction of 8-dimethylaminonaphthyllithium etherate with the tellurium­(II) bis­(dithiocarbamate) Te­(S2CNEt2)2 provided the diaryltelluride (8-Me2NC10H6)2Te (1). The oxidation of 1 with an excess of H2O2 did not afford the expected diaryltellurium­(IV) oxide (8-Me2NC10H6)2TeO (2), but the diaryltellurium­(VI) dioxide (8-Me2NC10H6)2TeO2 (3). The preparation of 2 was achieved by the comproportionation reaction of 1 and 3. The protonation of 2 using triflic acid gave rise to the formation of diarylhydroxytelluronium triflate [(8-Me2NC10H6)2Te­(OH)]­(O3SCF3) (4), which features the protonated diaryltellurium oxide [(8-Me2NC10H6)2Te­(OH)]+ (4a). Compounds 1, 3·H2O·H2O2, 3·2H2O, and 4 were characterized by X-ray crystallography. The experimentally obtained molecular structures were compared to those calculated for 1–3, 4a, and (8-Me2NC10H6)2Te­(OH)2 (5) as well as the related diphenyltellurium compounds Ph2Te (6), Ph2TeO (7), Ph2TeO2 (8), [Ph2Te­(OH)]+ (9a), and Ph2Te­(OH)2 (10) at the DFT/B3PW91 level of theory.