Polythiopene

Akinyeye, R. Michira, I. Botha, S. Baker, P. Iwuoha, E. In Recent advances in analytical electrochemistry Electrocatalytic sensor applications of Nanostructured polypyrroles and polythiopenes Kenneth, O. Ed. Chapter 4 Transworld Research Network Karala India, 2007, Vol., pp. 99. 

Figure 12.5 Polarized fluorescent spectra of aligned film of PPCHT. Solid line, perpendicular to H dashed line, parallel to H. From I. Osaka, H. Goto, K. Itoh, K. Akagi, Synthesis and properties of polythiopene and polythienylenevinylene derivatives with a liquid crystallinity. Mol. Cryst. Liq. Cryst, 365, 339-346 (2001), reprinted by permission of the publisher (Taylor Francis Ltd, http //www.tandf.co.uk/journals)...

Electrosynthesis of the polythiopene was realized on an indium-tin-oxide (ITO) electrode (glass blade covered with an indium-doped tin-oxide film). Before conducting the experiment, each electrode was cleaned by ultrasonication for 10 min in different solvents (acetone, dichloromethane, ether). Electrochemical experiments were performed in a three-compartment cell. The working electrode was the ITO electrode, the counter electrode was a Pt wke, and the reference electrode was an aqueous-saturated calomel electrode (E°/SCE = E°/NHE — 0.2412 V) with a salt bridge containing the supporting electrode. The SCE electrode was checked against the ferrocene/ferricinium couple (E = -1-0.405 V/SCE) before and after each experiment. 

Kline RJ, Me Gehee MD, Toney MF (2006) Highly oriented crystals at the buried interface in polythiopene thin-film transistors. Nat Mater 5 222-228... 

Despite their low molecular weights, these imsubstituted polythiopenes are insoluble in THF and other common organic solvents and are also infusible. Their poor processibility has therefore led to extensive studies of alkyl-and alkoxy- substituted polythiophenes in the hope of enhancing solubility in organic solvents and allowing melt-processing. Synthetic approaches to these substituted polythiophenes are described below. 

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