Figure 2 a) Reaction scheme of the reversible ring-opening photoisomerization of 1,3,3-trimethylindolino- 6'-nitrobenzopyrylospirane 1 to its merocyanine form 2. b) Spectral Napierian absorption coe cient of 1 and a mixture of species 1 and 2 dissolved in technical grade ethanol after irradiation of wavelength 365 nm .
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