Ultrafast dynamics of photochromic compound based on oxazine ring opening

  • M. Barkauskas
  • V. Martynaitis
  • A. Šačkus
  • R. Rotomskis
  • V. Sirutkaitis
  • M. Vengris


We have performed a femtosecond pump-probe and nanosecond flash-photolysis measurements on a new type of photochromic molecules. These photochromes incorporate an indolo[2,1-b][1,3]benzoxazine ring system which opens upon UV light excitation and closes back within a few tens of ns. The details of ring opening and spectral properties of the photoproducts have been studied by investigating the spectral signatures of the model compounds representing separate structural parts of the photochromic switch. Comparison of the photoinduced dynamics of the model compounds and those of photochromic molecule has revealed a detailed molecular picture of the light-driven switch function.
Keywords: photochromism, pump-probe, flash-photolysis, indolo[2,1-b][1,3]benzoxazine, 4-nitrophenol, 4-nitrophenolate, 3H-indolium iodide, transient absorption, ring opening
PACS: 33.20.Kf, 82.53.Hn, 82.53.Uv