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Conjugated, rod-like viologen oligomers: correlation of oligomer length with conductivity and photoconductivity
journal contribution
posted on 2023-06-09, 12:48 authored by Long Chen, Elodie Vivier, Charlotte J Eling, Tahkur S Babra, Jean-Sebastien G Bouillard, Ali M Adawi, David M Benoit, František Hartl, Howard M Colquhoun, Olga A Efremova, Barnaby GreenlandBarnaby GreenlandAn 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 to 221 nm thick) increased by more than an 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.
History
Publication status
- Published
File Version
- Accepted version
Journal
Synthetic MetalsISSN
0379-6779Publisher
ElsevierExternal DOI
Volume
241Page range
31-38Department affiliated with
- Chemistry Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2018-04-10First Open Access (FOA) Date
2019-10-07First Compliant Deposit (FCD) Date
2018-04-10Usage metrics
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