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  Illuminating the photoisomerization of a modified azobenzene single crystal by femtosecond absorption spectroscopy

Krawczyk, K. M., Field, R. L., Liu, L. C., Dong, M., Woolley, G. A., & Miller, R. J. D. (2019). Illuminating the photoisomerization of a modified azobenzene single crystal by femtosecond absorption spectroscopy. Canadian Journal of Chemistry, 97(6), 488-495. doi:10.1139/cjc-2018-0461.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-C2B9-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-C2BA-0
Genre: Journal Article

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https://dx.doi.org/10.1139/cjc-2018-0461 (Publisher version)
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 Creators:
Krawczyk, K. M.1, 2, Author
Field, R. L.1, 2, Author
Liu, L. C.1, 2, Author
Dong, M.3, Author
Woolley, G. A.1, Author
Miller, R. J. D.1, 2, 4, Author              
Affiliations:
1Department of Chemistry, University of Toronto, ou_persistent22              
2Department of Physics, University of Toronto, ou_persistent22              
3Institute of Neuroregeneration & Neurorehabilitation, Qingdao University, ou_persistent22              
4Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              

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Free keywords: photoisomerization, ultrafast spectroscopy, azobenzene, structural dynamics
 Abstract: The mechanism of isomerization for azobenzene is a topic still to be completely elucidated. Here, we describe the ultrafast dynamics of a brominated dioxane-methoxy-azobenzene under single crystal conditions by means of femtosecond transient absorption (TA) spectroscopy. Upon excitation with 400 nm light, spectral components with decays of 0.72, 2.9, and >10 ps are observed. The fast components of the system correspond to vibrational cooling of the population on the S1 excited state, with a decay to a local minimum in the reaction coordinate, followed by a longer evolution to a dark intermediate state prior to relaxing to the ground state, S0. The long time constant can be used to describe the isomerization process, returning excited population to the ground state. Spectral frequencies observed at 33 and 82 cm−1 suggest that both rotation and inversion occur in the system, with a stronger contribution coming from the latter due to a weakened N–N double bond in the excited state. This information provides insight into the structural nature of modified azobenzene systems and sets the stage for future structural studies of the molecule’s isomerization dynamics.

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Language(s): eng - English
 Dates: 2018-10-282019-03-042019-04-022019-06
 Publication Status: Published in print
 Pages: 8
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1139/cjc-2018-0461
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Project name : We acknowledge NSERC and the Max Planck Society for their financial support. KMK acknowledges the School of Graduate Studies for their support with the Ontario Graduate Scholarship. We also thank Jordan Wentzell for his technical help with the microtome and Dr. Yifeng Jiang for his guidance.
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Title: Canadian Journal of Chemistry
Source Genre: Journal
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Publ. Info: Ottawa, Canada : NRC Research Press
Pages: 8 Volume / Issue: 97 (6) Sequence Number: - Start / End Page: 488 - 495 Identifier: ISSN: 0008-4042
CoNE: https://pure.mpg.de/cone/journals/resource/954925388196_1