Organic-Solvent-Soluble Chiral Polythiophenes

A large number of optically active polythiophenes have been prepared through the chemical polymerization of monomers bearing chiral substituents covalently bound 

Similar thermochromic and solvatochromic effects have been observed by Bidan and coworkers71 for the optically active polymer 25 prepared in a regiospecihc fashion (100% HT-HT coupling) by the McCullough method. In contrast, the analogous regiorandom polymer prepared by oxidation with FeCl3 in chloroform has only weak optical activity. However, the disubstituted chiral polythiophene 26, synthesized by 

In this section, the structural studies of polythiophenes are reviewed the influence of structure on properties is considered in subsequent sections. The description of polythiophene structures include the alkyl-substituted thiophenes, such as poly(3-alkylthiophenes) (P3ATh s). 

---

Another interesting water-soluble polythiophene is 22, bearing a chiral amino acid side chain, which was prepared by Hjertberg, Inganas and co-workers by oxidative polymerization with FeClg. The chiroptical and sol-vatochromic properties of this optically active polymer are described in the later section entitled Chiroptical properties of optically active poly thiophenes. The synthesis of other, organic solvent-soluble chiral polythiophenes is discussed directly below. 

---