Issue 23, 2006
From the journal:

Dalton Transactions

Novel tripod ligands for prickly self-assembled monolayers†

Tobias Weidner,ac   Andreas Krämer,bc   Clemens Bruhn,bc   Michael Zharnikov,d   Andrey Shaporenko,d   Ulrich Siemeling*bc  and  Frank Träger*ac  

* Corresponding authors

a Institute of Physics, University of Kassel, Heinrich-Plett-Str. 40, Kassel, Germany
E-mail: traeger@physik.uni-kassel.de

b Institute of Chemistry, University of Kassel, Heinrich-Plett-Str. 40, Kassel, Germany
E-mail: siemeling@uni-kassel.de

c Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett-Str. 40, Kassel, Germany

d Applied Physical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, Heidelberg, Germany

Abstract

The new tridentate thioether ligands PhSi(CH2SMe)3 (1) and Ph-p-C6H4Si(CH2SMe)3 (2) have been synthesised and used for the preparation of the chelates fac-[W(κ3-1)(CO)3] and fac-[W(κ3-2)(CO)3], which were characterised by single-crystal X-ray diffraction. 1 and 2 were used as tripodal adsorbate molecules for the fabrication of self-assembled monolayers (SAMs) on gold. Film formation from solution was investigated in situ by second harmonic generation (SHG) and ellipsometry, which revealed a two-stepped process (fast adsorption, followed by slow film ordering). SAMs of 2 on gold were further investigated by ex situ methods, viz. high-resolution X-ray photoelectron spectroscopy (HRXPS), Fourier transform infrared reflection absorption spectroscopy (FTIRRAS), and scanning tunneling microscopy (STM). The latter two methods indicated dense packing of the tripodal anchor groups on the surface, with a substantially lower density of the biphenyl pricks. HRXPS showed three different binding states of sulfur, including a standard thiolate-type and a coordination-type state.

Graphical abstract: Novel tripod ligands for prickly self-assembled monolayers

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Article information

DOI
https://doi.org/10.1039/B515727G
Article type
Paper
Submitted
07 Nov 2005
Accepted
10 Jan 2006
First published
10 May 2006

Dalton Trans., 2006, 2767-2777

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Novel tripod ligands for prickly self-assembled monolayers

T. Weidner, A. Krämer, C. Bruhn, M. Zharnikov, A. Shaporenko, U. Siemeling and F. Träger, Dalton Trans., 2006, 2767 DOI: 10.1039/B515727G

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