Synthesis and Photophysical Properties of a Photoelectrochromic Polymer Containing the bis(2-(4-Pyridiniumyl)thiazole) Chromophore

Toshihiko Nagamura; Yasuhiro Sota

doi:10.1071/CH09099

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Synthesis and Photophysical Properties of a Photoelectrochromic Polymer Containing the bis(2-(4-Pyridiniumyl)thiazole) Chromophore

Toshihiko Nagamura ^A ^B and Yasuhiro Sota ^A

+ Author Affiliations

- Author Affiliations

^A Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.

^B Corresponding author. Email: nagamura@cstf.kyushu-u.ac.jp

Australian Journal of Chemistry 62(8) 871-876 https://doi.org/10.1071/CH09099
Submitted: 17 January 2009 Accepted: 14 April 2009 Published: 13 August 2009

Abstract

A new polymer and small molecules containing the chromophore bis(2-(4-pyridiniumyl)thiazole) were synthesized. Their tetraphenylborate salts showed absorption spectral changes in the visible to near-infrared region accompanying a colour change from yellow to green on steady photoirradiation. From electron spin resonance measurements and comparison with Molecular Orbital PACkage (MOPAC) calculations, this was assigned to the formation of bis(2-(4-pyridiniumyl)thiazole) radicals due to a photoinduced electron-transfer reaction from tetraphenylborate and decomposition of its oxidized form. Transient absorption spectra corresponding to those of tetraphenylborate salts were observed for bromide salts on femtosecond laser excitation of the polymer in solid films and solutions. The fastest decay of transient absorption due to back electron transfer was less than 1 picosecond.

Acknowledgements

The authors thank Fuyuki Ito, Ryuji Matsumoto and Takayasu Nagai for their partial contributions. The present study was partly supported by the Grant-in-Aid for Scientific Research on Priority Areas ‘Strong Photon–Molecule Coupling Fields’ (No. 20043027) from the Ministry of Education, Science, Sports and Culture, Japan.

References

Synthesis and Photophysical Properties of a Photoelectrochromic Polymer Containing the bis(2-(4-Pyridiniumyl)thiazole) Chromophore

Abstract

Acknowledgements

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