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  Imine Derivatives on Au(111): Evidence for “Inverted” Thermal Isomerization

Mielke, J., Leyssner, F., Koch, M., Meyer, S., Luo, Y., Selvanathan, S., et al. (2011). Imine Derivatives on Au(111): Evidence for “Inverted” Thermal Isomerization. ACS NANO, 5(3), 2090-2097. doi:10.1021/nn103297e.

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 Creators:
Mielke, Johannes1, 2, Author           
Leyssner, Felix2, Author
Koch, Matthias1, 2, Author           
Meyer, Stephan2, Author
Luo, Ying3, Author
Selvanathan, Sofia2, Author
Haag, Rainer3, Author
Tegeder, Petra2, Author
Grill, Leonhard1, 2, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Physics Department, Freie Universität Berlin, Arnimallee 14, Berlin, Germany, ou_persistent22              
3Chemistry Department, Freie Universität Berlin, Takustraße 3, Berlin, Germany, ou_persistent22              

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Free keywords: molecular switch; isomerization; scanning tunneling microscopy (STM); electron energy loss spectroscopy (EELS); metal surface; single-molecule manipulation
 Abstract: Molecules that undergo reversible isomerization between trans and cis states, typically upon illumination with light at appropriate wavelengths, represent an important class of molecular switches. In this combined scanning tunneling microscopy (STM) and high-resolution electron energy loss spectroscopy (HREELS) study, we report on self-assembled arrays of imine derivatives on a Au(111) surface. Most of the molecules are found in the trans state after deposition at room temperature, but many of them change their conformation upon heating, which we assign to switching to the cis state. As for many molecular switches, the trans isomer is the energetically more stable compound in solution, resulting in thermal cis to trans relaxation upon sufficient heating. On the surface, however, the number of cis isomers increases with temperature, pointing toward an “inverted” thermal isomerization behavior. The reason for this surface-mediated effect could be a stronger coupling, as compared to the trans state, of the central imine part of the molecule to the gold surface, which is sterically only possible in the cis state.

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Language(s): eng - English
 Dates: 2011-03
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/nn103297e
 Degree: -

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Title: ACS NANO
Source Genre: Journal
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Pages: - Volume / Issue: 5 (3) Sequence Number: - Start / End Page: 2090 - 2097 Identifier: -