Method of making a pyrrolo bisthiazole homopolymer

Abstract

The method of making a pyrrolo bisthiazole homopolymer starts with dissolving a dibrominated pyrrolo[3,2-d:4,5-d′]bisthiazole monomer having the formula: where R is an alkyl group, in anhydrous tetrahydrofuran (THF). Then, the solvated monomer is treated with 1 equivalent of a Turbo-Grignard reagent complex having the formula iPrMgCl.LiCl at 0° C. to form a reaction mixture. The reaction mixture is stirred for 1 hour at room temperature, and after stirring, the reaction mixture is refluxed for 24 hours. A conjugated homopolymer product having the formula: where n is the number of repeating units of pyrrolo[3,2-d:4,5-d′]bisthiazole, is recovered from the reaction mixture. The PBTz-based homopolymers showed broad absorption from 450 to 850 nm in thin film and excellent photochemical and thermal stability, making the polymers suitable for lightweight, low cost plastic electronic devices.

Dependencies are inferred from the claim text.