Picture of a black hole

Strathclyde Open Access research that creates ripples...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of research papers by University of Strathclyde researchers, including by Strathclyde physicists involved in observing gravitational waves and black hole mergers as part of the Laser Interferometer Gravitational-Wave Observatory (LIGO) - but also other internationally significant research from the Department of Physics. Discover why Strathclyde's physics research is making ripples...

Strathprints also exposes world leading research from the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

Discover more...

Toward controlled donor-acceptor interactions in noncomposite polymeric materials: synthesis and characterization of a novel polythiophene incorporating -conjugated 1,3-dithiole-2-ylidenefluorene units as strong D-A components

Skabara, P.J. and Serebryakov, I.M. and Perepichka, I.F. and Sariciftci, N.S. and Neugebauer, H. and Cravino, A. (2001) Toward controlled donor-acceptor interactions in noncomposite polymeric materials: synthesis and characterization of a novel polythiophene incorporating -conjugated 1,3-dithiole-2-ylidenefluorene units as strong D-A components. Macromolecules, 34 (7). pp. 2232-2241. ISSN 0024-9297

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

Abstract

A novel polythiophene bearing a strong electron-accepting fluorene unit has been synthesized. Poly(2d) can be prepared by chemical (iron(III) chloride) or electrochemical oxidation. Intramolecular charge-transfer (ICT) within the polymer was studied by electronic absorption spectroscopy and compared to a series of model monomer derivatives. The redox properties of the materials were studied by cyclic voltammetry; polythiophene main chain in poly(2d) is oxidized at ca. +0.7 V vs Ag/AgCl, while the nitrofluorene repeat unit is reduced at ca. -0.5 and -0.7 V. The model compounds 3a-e show a Hammett-type correlation for ICT energies, E1red1/2 and E2red1/2 vs the substituents on the fluorene ring, with the sensitivity parameters ICT- 0.17-0.20 eV and CV- 0.17-0.25 V. In contrast, the oxidation process (Eox) displays very low sensitivity to the structure of the fluorene ring (CV- 0.04 V), indicating that ICT can be substantially tuned without a noticeable effect on the redox properties of the thiophene moiety in 3; this behavior can be extended (extrapolated) to terthiophenes 2 and their polymers. Photoinduced IR spectroscopy of poly(2d) provides evidence of long-living photoexcited charge transfer in the polymer.