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Organic photochromic molecules such as diarylethene and fulgide derivatives with small ring-opening photochromic reaction yields at the lowest electronic excited state showed drastic enhancement of the reaction under the picosecond laser pulsed excitation in the visible region, while the femtosecond laser pulsed excitation did not induce such an effective reaction. Excitation intensity effect of the reaction yield and dynamic behaviors revealed that the successive multiphoton absorption process leading to higher excited states with a large reaction yield led to the enhancement of the reaction. On the other hand, the one-photon UV absorption directly pumped to a higher excited state did not lead to the effi cient reaction. The selectivity of the reaction depending on the mode of the excitation was discussed from the viewpoints of optical selection rule of the electronic transition.

Multiphoton-Gated Reaction in Organic Photochromic Molecules under Pulsed Laser Excitation