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Two-Photon Absorption of Bis[4-(N,N-diphenylamino)phenylethynyl]arenes

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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→S1 transition. This is explained by a vibronic coupling mechanism.

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