Fatigue Resistance of Photochromic Diarylethene in the Presence of Cyclodextrins with Different Pore Sizes

Among the various types of photochromic compounds, diarylethenes have good fatigue resistance, but further improvement is required. In this study, we investigated reaction behavior and resistance by inclusion in cyclodextrin (CD), which a cyclic host molecule with three different pore sizes. A water-soluble diarylethene (DE1) synthesized work exhibited reversible photochromism water. Continuous irradiation UV light resulted formation its byproduct. The addition ?CD showed no resistance. However, ?CD ?CD suppressed side to result Especially, gave large improvement. To clarify relationship between DE1 size CD, host-guest interaction CD was using NOESY spectra. results indicate that depth included shows effect on suppression DE1.