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Keywords:

  • chromophores;
  • electron transfer;
  • photochemistry;
  • two-photon absorption;
  • UV/Vis spectroscopy
Thumbnail image of graphical abstract

Attractive chromophores for photoscience: Two-photon (TP) absorption (TPA) of ethynyl chromophores 25 (see picture) was studied using femtosecond excitation between 710–950 nm. Compounds 25 possess higher excitation energies for the TP-excited than for the one-photon (OP) excited states. Chromophore 2 exhibits an additional slight absorption band at the S0[RIGHTWARDS ARROW]S1 transition. This is explained by a vibronic coupling mechanism.