A Mössbauer study of organotellurium compounds. Part II. Halides, acetates, and benzoates

Abstract

125Te Mössbauer data, measured at 4.2 K, are reported for a number of organotellurium(IV) compounds, including Ar2TeF2, ArTeF3, Ar2Te(OCOCH3)2, Ar2Te(OCOC6H5)2, where Ar = Ph, p-EtOC6H4, p-MeOC6H4, p-C7H7, and the compounds Ph2(CH3)TeI and Ph(CH3)2TeI. Evidence is presented that while the difluorides appear to be similar in structure to the other dihalides(X = Cl, Br, I), in the trifluorides the co-ordination about the tellurium is significantly different to that found in the other trihalides (X = Cl, Br, I). The iodides studied have parameters consistent with their formulation as Ph2(CH3)Te+I− and Ph(CH3)2Te+I−. The dicarboxylates have parameters similar to those of the dihalides, although the diphenyl tellurium diacetate and dibenzoate have relatively small Δ's in comparison with those of the other derivatives studied and it would appear that subtle changes in the co-ordination about tellurium occur with changes in the aryl ligand.