A novel organotellurium halide with tellurium presenting mixed oxidation states: Synthesis and structural characterization

In this work we have investigated the reaction for the obtention of an uncommon complex salt of the organotellurium bromide class. The reaction was carried out without the isolation of the synthetic intermediates in one-pot procedure. The complex salt obtained presents the tellurium atoms with mixed oxidation states (TeII and TeIV). The cationic unit [5-Br-2-CH3O–C6H3Te(ETU)]+ presents the TeII atom with a “T” shape coordination geometry, and the anionic unit [4-CH3O–C6H4TeBr4]− presents the TeIV atom with an octahedral coordination geometry considering the Te···Br interaction of 3.600(6) Å from the dimeric arrangement presented in the solid state. Intermolecular (Te···Br) secondary bonds, built up the crystalline/molecular structure. Solution NMR data are presented and discussed in the light of the X-ray structure.