Acidochromic spiropyran–merocyanine stabilisation in the solid state
(2018) CrystEngCom — (2018)
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- In this work, we present an innovative approach to stabilise the open-ring merocyanine form of a spiropyran compound. In the solid state, the merocyanine form is rarely observed, highlighting the importance of this contribution. Our concept is based on a co-crystallisation approach of the open form with an inorganic acid. This way, we identified a reliable technique for stabilising the coloured merocyanine form, and in one specific case, we even obtained crystals with increased stability towards photodegradation. 15 novel crystal structures of spiropyran derivatives with several inorganic acids were determined by single crystal X-ray diffraction. Solvent evaporation of spiropyran compounds, ie 1, 3, 3-trimethylindolinobenzopyrylospiran (SPH), 1, 3, 3-trimethylindolino-β-naphthopyrylospiran (SPBenz), 1, 3, 3-trimethylindolino-8′-methoxybenzopyrylospiran (SPOMe) and 1, 3, 3 …
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Seiler, V. K., Callebaut, K., Robeyns, K., Tumanov Nicolay, Wouters, J., Champagne, B., & Leyssens, T. (2018). Acidochromic spiropyran–merocyanine stabilisation in the solid state. CrystEngCom. Published. https://hdl.handle.net/2078.5/53469 (Original work published 2018)