Spectroscopic characterization of omega-substituted biphenylthiolates on gold and their use as substrates for "on-top" siloxane SAM formation

Langmuir : the ACS Journal of Surfaces and Colloids
S StoychevaA Ulman

Abstract

Self-assembled monolayers (SAMs) of omega-substituted biphenylthiolates (omega-MBP) on gold were characterized by spectral ellipsometry, X-ray photoelectron spectroscopy (XPS), infrared reflection absorption spectroscopy (IRRAS), and vibrational sum frequency generation spectroscopy (VSFG). The vibrational studies of the SAMs were supported by an ab initio frequency analysis at HF/6-31G and BP86/6-31G levels, yielding an assignment of all relevant spectral features in the range from 3500 to 1200 cm(-1). We were able to demonstrate that hydroxy-terminated MBP (HMBP) SAMs are basically featureless in the range of the CH stretching vibrations. Accordingly, the adsorption of a SAM of octadecyltrichlorosilane (OTS) on top of this model surface could be studied. A red shift of the C-O stretching vibration from 1281 to 1264 cm(-1) was observed during the chemisorption of OTS, thus allowing for a quantification of the number of OTS molecules involved in surface binding of OTS, which was found to be about 26% on average.

References

Jan 18, 1996·Nature·J Israelachvili, H Wennerström
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Oct 6, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·Andrew W DoyleDavid J Neivandt
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Citations

Apr 14, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Michaël A RaminThierry Buffeteau
Aug 13, 2010·Beilstein Journal of Organic Chemistry·Adam W FranzThomas J J Müller
Jan 25, 2007·Small·Ursula SchmelmerRainer Jordan
Jun 10, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Julian RechmannAndreas Erbe
Dec 4, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Zenonas KuodisGediminas Niaura
May 8, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Michał MalickiSeth R Marder
Sep 30, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Y Yang, M Ruths
Jan 11, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Scott A TrammellNikolai Lebedev
Mar 3, 2007·Journal of the American Chemical Society·Andrew M McDonaghJanis G Matisons

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