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Moreno J, Gerecke M, Dobryakov AL, et al. Two-Photon-Induced versus One-Photon-Induced Isomerization Dynamics of a Bistable Azobenzene Derivative in Solution. J Phys Chem B. 2015;119(37):12281-8doi: 10.1021/acs.jpcb.5b07008.
Moreno, J., Gerecke, M., Dobryakov, A. L., Ioffe, I. N., Granovsky, A. A., Bléger, D., Hecht, S., & Kovalenko, S. A. (2015). Two-Photon-Induced versus One-Photon-Induced Isomerization Dynamics of a Bistable Azobenzene Derivative in Solution. The journal of physical chemistry. B, 119(37), 12281-8. https://doi.org/10.1021/acs.jpcb.5b07008
Moreno, J, et al. "Two-Photon-Induced versus One-Photon-Induced Isomerization Dynamics of a Bistable Azobenzene Derivative in Solution." The journal of physical chemistry. B vol. 119,37 (2015): 12281-8. doi: https://doi.org/10.1021/acs.jpcb.5b07008
Moreno J, Gerecke M, Dobryakov AL, Ioffe IN, Granovsky AA, Bléger D, Hecht S, Kovalenko SA. Two-Photon-Induced versus One-Photon-Induced Isomerization Dynamics of a Bistable Azobenzene Derivative in Solution. J Phys Chem B. 2015 Sep 17;119(37):12281-8. doi: 10.1021/acs.jpcb.5b07008. Epub 2015 Sep 08. PMID: 26322965.
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J Phys Chem B. 2015 Sep 17;119(37):12281-8. doi: 10.1021/acs.jpcb.5b07008. Epub 2015 Sep 08.

Two-Photon-Induced versus One-Photon-Induced Isomerization Dynamics of a Bistable Azobenzene Derivative in Solution.

The journal of physical chemistry. B

J Moreno, M Gerecke, A L Dobryakov, I N Ioffe, A A Granovsky, D Bléger, S Hecht, S A Kovalenko

Affiliations

  1. Department of Chemistry, Humboldt-Universität zu Berlin , Brook-Taylor-Strasse 2, 12489 Berlin, Germany.
  2. Department of Chemistry, Lomonosov Moscow State University , 119991 Moscow, Russia.
  3. Firefly Project , 117593 Moscow, Russia.

PMID: 26322965 DOI: 10.1021/acs.jpcb.5b07008

Abstract

We report on a bistable azobenzene derivative with sufficiently high 2-photon absorption to induce its photochemical isomerization and measurable excited state dynamics. Broadband transient absorption spectra were recorded and compared upon 1-photon (331 nm) and 2-photon (640 nm) excitation of the S0 → S2 transition. The spectra are different at early (t ∼ 1 ps) and late (t ∼ 100 ps) time but show similar photoisomerization behavior on a 10 ps time scale. With 2-photon excitation, strong population transfer S2 → Sn occurs due to resonance absorption of a third pump photon. Subsequent internal conversion Sn → S1 results in a very hot S1 population causing extra-broadening of the transient spectra. The resonance pump absorption is common with nonlinear excitation and should be taken into account when considering photochemical applications. The 2-photon excitation cross-section σ((2)) at 640 nm was measured to be 7 GM for the specific tetra-ortho-fluorinated azobenzene derivative and 1 GM for unsubstituted parent azobenzene. The direct 2-photon induced trans-to-cis isomerization, described herein, provides an unprecedented potential for spatially addressing P-type (bistable) azobenzene photoswitches in 3D.

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