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          Institute: Fritz-Haber-Institut     Collection: Theory     Display Documents



  history
ID: 442026.0, Fritz-Haber-Institut / Theory
Structure and excitonic coupling in self-assembled monolayers of azobenzene-functionalized alkanethiols
Authors:Gahl, Cornelius; Schmidt, Roland; Brete, Daniel; McNellis, Erik R.; Freyer, Wolfgang; Carley, Robert; Reuter, Karsten; Weinelt, Martin
Language:English
Date of Publication (YYYY-MM-DD):2010-01-25
Title of Journal:Journal of the American Chemical Society
Journal Abbrev.:J. Am. Chem. Soc.
Volume:132
Issue / Number:6
Start Page:1831
End Page:1838
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Optical properties and the geometric structure of self-assembled monolayers of azobenzene-functionalized alkanethiols have been investigated by UV/visible and near edge X-ray absorption fine structure spectroscopy in combination with density-functional theory. By attaching a trifluoro-methyl end group to the chromophore both the molecular tilt and twist angle of the azobenzene moiety are accessible. Based on this detailed structural analysis the energetic shifts observed in optical reflection spectroscopy can be qualitatively described within an extended dipole model. This substantiates sizable excitonic coupling among the azobenzene chromophores as an important mechanism that hinders trans to cis isomerization in densely packed self-assembled monolayers.
External Publication Status:published
Document Type:Article
Communicated by:Matthias Scheffler
Affiliations:Fritz-Haber-Institut/Theory
External Affiliations:Max-Born-Institut, Max-Born-Str. 2A, 12489 Berlin, Germany

Freie Universit├Ąt Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin, Germany
Identifiers:URL:http://www.fhi-berlin.mpg.de/th/th.html [For a reprint, please contact THsecretary@fhi-berlin.mpg.de]
URL:http://dx.doi.org/10.1021/ja903636q [only subscriber]
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