The mechanism of the photochromic transformation of spirorhodamines.

  title={The mechanism of the photochromic transformation of spirorhodamines.},
  author={Hugo Jorge Montenegro and Mat{\'i}as Di Paolo and Daiana A Capdevila and Pedro Francisco Aramend{\'i}a and Mariano Luis Bossi},
  journal={Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology},
  volume={11 6},
We investigate the equilibrium, kinetics, and mechanism of the photochromic transformation of a series of amido spirorhodamine compounds-differing in the nature of the substituents of the amido group and in the rhodamine chromophore-in ethanol at room temperature in the presence of trifluoroacetic acid. A proton participates in the equilibrium between the spiro form and the open rhodamine form. The relaxation times in the dark or under continuous irradiation show a linear dependence on the… CONTINUE READING

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