The Structure of [4-(Phenylazo)phenoxy]hexane-1-thiol Self-Assembled Monolayers on Au(111)
The Journal of Physical Chemistry B2002Vol. 106(9), pp. 2255–2260
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Stefan C. B. Mannsfeld, Tobias W. Canzler, Torsten Fritz, Holger Proehl, Karl Leo, Steffi Stumpf, Gudrun Goretzki, Karsten Gloe
Abstract
The structure of [4-(phenylazo)phenoxy]hexane-1-thiol (AzoC6) self-assembled monolayers (SAMs) on Au(111) has been investigated with scanning tunneling microscopy (STM) and Fourier transform infrared-reflection absorption spectroscopy (FTIR-RAS). The FTIR-RAS results yield a tilt angle of the molecules close to 0°, which significantly differs from the 30° tilt angle of linear n-alkanethiols. In STM images two types of domains are observed that have equal unit cell dimensions and two molecules per unit cell but show different tunneling contrasts, which is attributed to a different arrangement of the molecules within the unit cell. The relationship of the molecular lattice to the substrate lattice is found to be commensurate.
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