The deck is stacked in favor of future photonic devices. Novel photochromic crystals comprise alternating layers of two conformations of diarylethene 1 a. Irradiation with UV light induces isomerization of only one conformer to the blue-colored, closed-ring form, 1 b. This selective reactivity is ascribed to the difference in distance between the reactive carbon atoms of the two conformers.
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Kobatake et al. (2005) studied this question.
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