Functionalized organotellurium macrocycles: Tuning optical bandgap and investigation of catalytic activity

Abstract

This work deals with the synthesis, characterization, and optical properties of a 12-membered tellurium macrocycle functionalized with an allyl group. These are synthesized by reaction of bis-p-methoxyphenyl tellurium dihalide with phenyl allyl phosphinic acid at room temperature. SCXRD reveals that the cationic macrocycle is capped by two halide ions giving an overall composition of [((p-OMePh)2Te)2(O)(PhC3H5PO2)(µ4-X)]2, where X = Cl (Cl-TAM), Br (Br-TAM). On reacting Cl-TAM with KI, we were able to isolate the iodo-capped macrocycle [((p-OMePh)2Te)2(O)(PhC-3H5PO2)(µ4-I)]2 (I-TAM). The presence of allyl groups at the periphery would allow these macrocycles to act as potential building blocks. Optical absorption studies show that the bandgap can be tuned by exchanging the capping halides. These systems were also found to act as catalysts for the detoxification of CEES, a mustard gas simulant.