Photochromism of diarylethene derivatives having cyclohexyl and cyclohexenyl groups in single-component crystals and a two-component mixed crystal

Diarylethene derivatives 1a having two cyclohexyl groups and 2a having a cyclohexyl and a cyclohexenyl group formed a mixed crystal composed of almost equal amounts of the two components, and underwent photochromism in the mixed crystal as well as in the single-component crystals.