Abstract
Synthesis, structure study, and photochromic properties of new salt spiropyrans of indoline series containing chlorine and bromine atoms in the 6'-position of the 2H-chromene moiety have been reported. The structure of the obtained compounds has been confirmed by 1H NMR spectroscopy and X-ray diffraction analysis. The compounds are photochromic; the long-wavelength absorption maximum for photoinduced isomer shows a considerable hypsochromic shift, while the lifetime increases considerably as compared with the fluorine-containing analog.
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ACKNOWLEDGMENTS
N.I. Makarova and I.A. Rostovtseva thank the Russian Foundation for Basic Research for support of photochemical research (project no. 16–03–01086 A). V.V. Tkachev, G.V. Shilov, and S.M. Aldoshin acknowledge the support of X-ray diffraction experiments by State Contract no. 0089-2014-0009.
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Translated by I. Kudryavtsev
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Pugachev, A.D., Lukyanova, M.B., Tkachev, V.V. et al. New Photochromic Salt Spiropyrans of Indoline Series. Dokl Chem 484, 58–63 (2019). https://doi.org/10.1134/S0012500819020113
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DOI: https://doi.org/10.1134/S0012500819020113