A lophine dimer (LPD), that is one of the photochromic compounds, is cleaved into a pair of colorized lophyl radicals by ultraviolet (UV) light irradiation. The radical species reversibly recover to the colorless lophine dimer by thermal recombination. In comparison with the rapid coloration reaction by the UV irradiation, the thermal decoloration reaction is extremely slow because low collision frequency for recombination caused by the free diffusion of the radicals in solution. Recently, Abe and coworkers reported lophine dimers with a linker showed rapid recombination reaction. In this study, we tried to accelerate a recombination reaction of the lophyl radicals by using the inner environment of the micelles, spontaneously formed by surfactants. In this presentation, we will discuss the effects of the solubilization state of lophine dimers in the micelles and the chemical stuructures on the speeds of the recombination reaction of the lophyl radicals.

Acceleration of photoisomerization reaction of lophine dimers with inner environment of the micelles

256th National Meeting (2018)

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