Conclusions
-
1.
We have measured the energy barriers to conversion of the colorless form of five indolinospiropyrans with different 8′-substituents.
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2.
We have measured the dependence of the angle between the oscillators of the electronic transitions of the colored form of the spiropyrans on the donor-acceptor properties of these substituents.
-
3.
The introduction of substituents into the pyran fragment of the spiropyran molecule controls the pathway for the color reaction and the equilibrium among the stereoisomers of the colored form.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2272–2278, October, 1980.
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Marevtsev, V.S., Zaichenko, N.L., Ermakova, V.D. et al. Effect of electron-donating and electron-accepting substituents on photo- and thermochromic properties of indolinospiropyrans. Russ Chem Bull 29, 1591–1596 (1980). https://doi.org/10.1007/BF00951220
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DOI: https://doi.org/10.1007/BF00951220