Abstract

Having it both ways: The reversible photoisomerization of a derivative of spiropyran at the level of a single crystal by using zeolite L is demonstrated. The synthesized spiropyran exhibits rare negative photochromism when dissolved in a 1:1 mixture of H2O and EtOH The spiropyran is functionalized predominantly at the channel entrances in the case of 4 μm long crystals (see picture).

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