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2. The colorless 1a (λmax = 261 nm) PMMA film turned red under the UV light (297 nm) irradiation, with a new broad absorption band at λmax = 536 nm appeared, which was assigned to the formation of the closed form 1b. The colored PMMA film can invert to colorless on irradiation of appropriate wavelength visible light (λ > 500 nm). 0 300 400 500 600 Wavelength/nm Fig. 1. 0 × 10-5 mol/L). 700 300 400 500 Wavelength/nm 600 Fig. 2. Absorption spectra of compound 1a in PMMA amorphous film(10%w/w). 0 nm.

In hexane, the absorption maximum of its colorless open-ring isomer was observed at 276 nm. 20 × 103 L·mol-1·cm-1). This can be assigned to the formation of the closed-ring isomer 1c, as shown in Fig. 1A. 074 at room temperature, respectively. When arrived at the photostationary state, the photoconversion ratio from open-ring to closed-ring isomer of the derivative 1 was analyzed by HPLC in hexane, and the results are shown in Fig. 2. From this figure, it can be easily calculated the photoconversion ratio of diarylethene 1 in the photostationary state, which its value is 74%.

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