2,5-Diaryltellurophenes: Effect of Electron-Donating and Electron-Withdrawing Groups on their Optoelectronic Properties.

The transformation of 1,2-bis(1-arylvinyl)ditellurides into 2,5-diaryltellurophenes by sequential ditelluride exchange and thermal intramolecular cyclization reactions is presented, and the optoelectronic properties of a series of 2,5-diaryltellurophenes with both electron-donating and electron-withdrawing aryl substituents are disclosed. Furthermore, the multicolored emissive tellurophenes in solution at room temperature have been demonstrated.

First Isolation of Bicyclic Ditellurides from the Reaction of Camphor Hydrazone with Tellurium Tetrachloride.

Reaction of camphor hydrazone with TeCI4 under basic conditions gave an isomeric mixture of vinyl ditelluride and Wagner-Meerwein rearranged ditelluride. Initially formed tellurocamphor enolized and oxidized to give vinyl telluride, whereas tellurocamphor complexed with TeC4 to afford carbocation, which rearranged in a Wagner-Meerwein manner to afford the rearranged ditelluride. Photolysis of ditelluride in methyl methacrylate solution gave the radical polymerization product, PMMA, in which ditelluride acted as a radical initiator.