Photo-impulsive reactions in the electronic ground state without electronic excitation: non-photo, non-thermal chemical reactions |
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Authors: | Iwakura Izumi Yabushita Atsushi Liu Jun Okamura Kotaro Kobayashi Takayoshi |
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Affiliation: | Innovative use of light and materials/life, PRESTO, JST, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan. iwakura@ils.uec.ac.jp |
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Abstract: | Allyl phenyl ether has an absorption band in the ultraviolet region (λ < 400 nm); therefore, irradiation with few-optical-cycle ultraviolet pulses (λ = 360-440 nm) causes a transition to the ultraviolet band, which leads to an electronic state and a photo-Claisen rearrangement (radical reaction) in the electronic excited state. However, the reaction scheme of allyl phenyl ether under irradiation with few-optical-cycle visible pulses (λ = 525-725 nm) was determined to be same as that of the thermal Claisen rearrangement ([3,3]-sigmatropic rearrangement), which is symmetry-allowed in the electronic ground state. Photo-excitation with few-optical cycle visible pulses below the absorption band induces a photo-impulsive reaction in the electronic ground state without electronic excitation, of which the trigger scheme is different from that of photoreaction or thermal-reaction. The photo-impulsive reaction in the electronic ground state is highly possible as a novel reaction scheme. |
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