Picture of wind turbine against blue sky

Open Access research with a real impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

The Energy Systems Research Unit (ESRU) within Strathclyde's Department of Mechanical and Aerospace Engineering is producing Open Access research that can help society deploy and optimise renewable energy systems, such as wind turbine technology.

Explore wind turbine research in Strathprints

Explore all of Strathclyde's Open Access research content

The first direct experimental comparison between the hugely contrasting properties of PEDOT and the all-sulfur analogue PEDOT by analogy with well-defined EDTT-EDOT copolymers

Spencer, Howard J. and Skabara, Peter J. and Giles, Mark and McCulloch, Iain and Coles, Simon J. and Hursthouse, Michael B. (2005) The first direct experimental comparison between the hugely contrasting properties of PEDOT and the all-sulfur analogue PEDOT by analogy with well-defined EDTT-EDOT copolymers. Journal of Materials Chemistry, 15 (45). pp. 4783-4792. ISSN 0959-9428

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

The structures of poly(3,4-ethylenedioxythiophene) (PEDOT) and poly(3,4-ethylenedithiathiophene) (PEDTT) vary only in the substituent chalcogen atoms, yet the electronic properties of the materials are surprisingly dissimilar. The difference in electronic band gaps is approximately 0.8 eV and the polymers behave very differently upon p-doping. Two new terthiophenes have been synthesised using Negishi coupling methods. The X-ray crystal structures of EDOT-EDTT-EDOT (OSO) and EDTT-EDOT-EDTT (SOS) show strong intramolecular chalcogen-chalcogen contacts which are responsible for persistent conformers in solution and solid state, although significant interchain interactions should also influence the properties of the materials. SOS and OSO can be polymerised by electrochemical oxidation to give the corresponding, well-defined poly(terthiophenes) PSOS and POSO. Spectroelectrochemical studies on all four polymers reveal strong similarities between PEDTT and PSOS, and between PEDOT and POSO. Together with independent electrochemical and absorption studies, the results indicate that the unique properties of PEDOT are influenced more by conformational effects (intrachain S center dot center dot center dot O contacts) than substituent effects.