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Conjugated, rod-like viologen oligomers: Correlation of oligomer length with conductivity and photoconductivity

Chen, Long; Vivier, Elodie; Eling, Charlotte J.; Babra, Tahkur S.; Bouillard, Jean Sebastien G.; Adawi, Ali M.; Benoit, David M.; Hartl, František; Colquhoun, Howard M.; Efremova, Olga A.; Greenland, Barnaby W.

Authors

Long Chen

Elodie Vivier

Charlotte J. Eling

Tahkur S. Babra

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Dr David Benoit D.Benoit@hull.ac.uk
Senior Lecturer in Molecular Physics and Astrochemistry

František Hartl

Howard M. Colquhoun

Barnaby W. Greenland



Abstract

© 2018 An iterative synthesis has been used to produce conjugated, monodisperse, viologen-based aromatic oligomers containing up to 12 aromatic/heterocyclic rings. The methoxy-substituted oligomers were soluble in common organic solvents and could be processed by spin coating. The conductivities of the resulting films (30–221 nm thick) increased by more than one order of magnitude as the oligomer length increased from unimer (1, 2.20 × 10 −11 S cm- 1 ) through dimer (2) to trimer (3, 6.87 × 10 -10 S cm -1 ). The bandgaps of the materials were estimated from the absorption spectra of these thin films. The longest oligomer, 3, exhibited a noticeably narrower bandgap (2.3 eV) than the shorter oligomers (1 and 2 both 2.7 eV). Oligomer 3 also showed photoconductivity under irradiation across a wide range of wavelengths in the visible spectral region. In conjunction with DFT calculations of these systems our results suggest that structurally related viologen-type oligomers may find use in optoelectronic devices.

Journal Article Type Article
Publication Date Jul 1, 2018
Journal Synthetic Metals
Print ISSN 0379-6779
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 241
Pages 31-38
APA6 Citation Chen, L., Vivier, E., Eling, C. J., Babra, T. S., Bouillard, J. S. G., Adawi, A. M., …Greenland, B. W. (2018). Conjugated, rod-like viologen oligomers: Correlation of oligomer length with conductivity and photoconductivity. Synthetic Metals, 241, 31-38. https://doi.org/10.1016/j.synthmet.2018.03.019
DOI https://doi.org/10.1016/j.synthmet.2018.03.019
Keywords Viologen; Photoconductivity; Conductivity; Organic synthesis
Publisher URL https://www.sciencedirect.com/science/article/pii/S0379677918300729?via%3Dihub
Copyright Statement © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

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Copyright Statement
© 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/





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