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• W2126064785 abstract "Abstract New types of diarylethene dimers bridged by a spiro structure were synthesized. One of their dimers formed three kinds of polymorphic forms by recrystallization from different solvents: hexane ( 1a‐ α), acetone ( 1a‐ β), and acetonitrile ( 1a‐ γ). In crystals of 1a‐ α and 1a‐ β the molecules are packed in solvent‐free crystal structures, whereas crystal 1a‐ γ includes acetonitrile molecules in the crystal. The difference of significant photochromic reactivities in their polymorphic crystals was observed for photocoloration reactions. Crystals 1a‐ β and 1a‐ γ showed photochromism in the single‐crystal phase, but 1a‐ α did not do so. Their photochromic reactivity was found to depend on the distance between the reactive carbon atoms by X‐ray crystallographic analysis. When the distance is less than 4.2 Å in the antiparallel conformation, the molecule can undergo photochromism in the crystal. On the other hand, crystals of bromo‐substituted diarylethene dimer ( 2a ) cannot be suitable for X‐ray crystallographic analysis when it was recrystallized from hexane, acetone, and acetonitrile. However, it formed single crystal by recrystallization from p ‐xylene, which showed photochromism in the crystalline phase. The edge‐to‐face aromatic interaction between p ‐xylene molecules assisted the crystal growth of the diarylethene dimer. Upon irradiation with ultraviolet light, two kinds of the enantiomers, ( M , SS )‐ and ( P , RR )‐ 2b , are produced. Partial photobleaching reactions of either of the two enantiomers by irradiation with linearly polarized visible light were confirmed by polarized absorption spectroscopy. Copyright © 2007 John Wiley & Sons, Ltd." @default.
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• W2126064785 date "2007-05-09" @default.
• W2126064785 modified "2023-10-04" @default.
• W2126064785 title "Single‐crystalline photochromism of diarylethene dimers bridged by a spiro structure" @default.
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• W2126064785 doi "https://doi.org/10.1002/poc.1196" @default.
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