Direct Probing Molecular Twist and Tilt in Aromatic Self-Assembled Monolayers

J. Am. Chem. Soc., 129 (50), 15416 -15417, 2007. 10.1021/ja0751882 S0002-7863(07)05188-8
Web Release Date: November 28, 2007

Direct Probing Molecular Twist and Tilt in Aromatic Self-Assembled Monolayers

Nirmalya Ballav, Björn Schüpbach, Ole Dethloff, Peter Feulner, Andreas Terfort,* and Michael Zharnikov*

Angewandte Physikalische Chemie, Universität Heidelberg, 69120 Heidelberg, Germany, Department Chemie, Philipps-Universität Marburg, 35032 Marburg, Germany, and Physikdepartment E20, Technische Universität München, D-85747 Garching, Germany

michael.zharnikov@urz.uni-heidelberg.de

Received July 12, 2007

Abstract:

Using a nitrile tailgroup as a spectroscopic marker, both twist and tilt of the aromatic backbones in several typical aromatic SAMs on Au(111) have been directly determined in a single experiment. Whereas the exact value of the twist angle depends on the molecular architecture, it was found to be quite noticeable in all SAMs (40-50) and close to the respective value for aromatic bulk systems (32).

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