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Multiphoton-gated cycloreversion reaction of a photochromic 1,2-bis(thiazolyl) perfluorocyclopentene diarylethene derivative

J. Piard, Y. Ishibashi, H. Saito, R. Métivier, K. Nakatani, G. Gavrel, P. Yu and H. Miyasaka Journal of Photochemistry and Photobiology A: Chemistry, 2012, 234, 57-65

Cycloreversion processes of a 1,2-bis(thiazolyl) perfluorocyclopentene photochromic diarylethene 1 with extremely low reaction yield under steady state irradiation in chloroform solution (1.3 × 10−3) was investigated by means of picosecond and femtosecond laser photolysis methods. The cycloreversion reaction was drastically enhanced by more than two orders of magnitude (ca. ×400) by a picosecond 532 nm laser excitation in comparison with a steady state irradiation. From time-resolved transient absorption measurements, double pulse experiments, and excitation intensity dependence of the transient absorbance and the reaction efficiency, this enhancement was attributed to a stepwise two-photon absorption process leading to high excited state.

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Publication

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Paru le 8 janvier 2012

Informations complémentaires :

doi 10.1016/j.jphotochem.2011.12.020