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Published in: Journal of Materials Science 17/2015

01-09-2015 | Original Paper

Red-to-black electrochromism of 4,9-dihydro-s-indaceno[1,2-b:5,6-b’]dithiophene-embedded conjugated polymers

Authors: Ching Mui Cho, Qun Ye, Wei Teng Neo, Tingting Lin, Jing Song, Xuehong Lu, Jianwei Xu

Published in: Journal of Materials Science | Issue 17/2015

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Abstract

A series of 4,9-dihydro-s-indaceno[1,2-b:5,6-b′]dithiophene-based conjugated polymers with 3,4-bis(dodecyloxy)thiophene, 3,3-bis((dodecyloxy)methyl)-3,4-dihydro-2H-thieno[3,4-b] [1, 4] dioxepine and 3,4-ethylenedioxythiophene as co-monomers were synthesized via Stille coupling reaction in more than 50 % yields. These polymers possess relatively high number-average molecular weights of 14,900–21,000 g mol−1 and exhibit good solubility in common organic solvents. The physical and electrochemical properties of these polymers were studied, and the polymers showed optical bandgap between 2.04 and 2.08 eV. Electrochromic devices showed a rare and reversible colour change between dark red at neutral state and black at oxidized state with optical switching contrast ratios of up to 50 % at λ max and 90 % at 1500 nm in the visible and NIR regions, respectively.

Graphical abstract

4,9-dihydro-s-indaceno[1,2-b:5,6-b’]dithiophene-based conjugated polymers showing rare and reversible colour change between dark red at neutral state and black at oxidized state were synthesized via Stille coupling. These polymers possess high optical contrast in both the visible and NIR regions.

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Appendix
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Metadata
Title
Red-to-black electrochromism of 4,9-dihydro-s-indaceno[1,2-b:5,6-b’]dithiophene-embedded conjugated polymers
Authors
Ching Mui Cho
Qun Ye
Wei Teng Neo
Tingting Lin
Jing Song
Xuehong Lu
Jianwei Xu
Publication date
01-09-2015
Publisher
Springer US
Published in
Journal of Materials Science / Issue 17/2015
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-015-9135-5

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