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  Switching of an Azobenzene-Tripod Molecule on Ag(111)

Scheil, K., Gopakumar, T. G., Bahrenburg, J., Temps, F., Maurer, R. J., Reuter, K., et al. (2016). Switching of an Azobenzene-Tripod Molecule on Ag(111). The Journal of Physical Chemistry Letters, 7(11), 2080-2084. doi:10.1021/acs.jpclett.6b01011.

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 Creators:
Scheil, Katharina1, Author
Gopakumar, Thiruvancheril G.2, Author
Bahrenburg, Julia3, Author
Temps, Friedrich3, Author
Maurer, Reinhard Johann4, Author
Reuter, Karsten4, Author           
Berndt, and Richard1, Author
Affiliations:
1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, 24098 Kiel, Germany, ou_persistent22              
2Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India, ou_persistent22              
3Institut für Physikalische Chemie, Christian-Albrechts-Universität, 24098 Kiel, Germany, ou_persistent22              
4Chair for Theoretical Chemistry, Catalysis Research Center, Technische Universität München, ou_persistent22              

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 Abstract: The trans–cis isomerization makes azobenzene (AB) a robust molecular switch. Once adsorbed to a metal, however, the switching is inefficient or absent due to rapid excited-state quenching or loss of the trans–cis bistability. We find that tris-[4-(phenylazo)-phenyl]-amine is a rather efficient switch on Ag(111). Using scanning tunneling and atomic force microscopy at submolecular resolution along with density functional theory calculations, we show that the switching process is no trans–cis isomerization but rather a reorientation of the N–N bond of an AB unit. It proceeds through a twisting motion of the azo-bridge that leads to a lateral shift of a phenyl ring. Thus, the role of the Ag substrate is ambivalent. While it suppresses the original bistability of the azobenzene units, it creates a new one by inducing a barrier for the rotation of the N–N bond.

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Language(s): eng - English
 Dates: 2016-05-112016-05-192016-05-202016-06-02
 Publication Status: Issued
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acs.jpclett.6b01011
 Degree: -

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Title: The Journal of Physical Chemistry Letters
  Abbreviation : J. Phys. Chem. Lett.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: 5 Volume / Issue: 7 (11) Sequence Number: - Start / End Page: 2080 - 2084 Identifier: ISSN: 1948-7185
CoNE: https://pure.mpg.de/cone/journals/resource/1948-7185