Orientational analysis of dodecanethiol and p-nitrothiophenol SAMs on metals with polarisation-dependent SFG spectroscopy

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Francesca CecchetAndré Peremans

Abstract

Polarisation-dependent sum frequency generation (SFG) spectroscopy is used to investigate the orientation of molecules on metallic surfaces. In particular, self-assembled monolayers (SAMs) of dodecanethiol (DDT) and of p-nitrothiophenol (p-NTP), grown on Pt and on Au, have been chosen as models to highlight the ability of combining ppp and ssp polarisations sets (representing the polarisation of the involved beams in the conventional order of SFG, Vis and IR beam) to infer orientational information at metallic interfaces. Indeed, using only the ppp set of data, as it is usually done for metallic surfaces, is not sufficient to determine the full molecular orientation. We show here that simply combining ppp and ssp polarisations enables both the tilt and rotation angles of methyl groups in DDT SAMs to be determined. Moreover, for p-NTP, while the SFG active vibrations detected with the ppp polarisation alone provide no orientational information, however, the combination with ssp spectra enables to retrieve the tilt angle of the p-NTP 1,4 axis. Though orientational information obtained by polarisation-dependent measurements has been extensively used at insulating interfaces, we report here their first application to metallic surfa...Continue Reading

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Citations

Jan 1, 2014·Journal of the American Chemical Society·Jennifer E LaaserMartin T Zanni
Nov 16, 2011·Physical Chemistry Chemical Physics : PCCP·C HumbertB Busson
Jun 22, 2016·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Dan Lis, Francesca Cecchet
Dec 14, 2016·Physical Chemistry Chemical Physics : PCCP·Xue JiaoRichard G Compton
Jan 20, 2017·The Journal of Physical Chemistry. a·Hilary M ChaseFranz M Geiger
Nov 3, 2017·Physical Chemistry Chemical Physics : PCCP·Conrard Giresse Tetsassi FeugmoBenoît Champagne
Nov 10, 2018·The Journal of Chemical Physics·Wei-Chen Yang, Dennis K Hore
Aug 31, 2019·Nature Communications·Yuqing ZhangJian Ye
Aug 4, 2021·The Journal of Chemical Physics·Joscha HekelePeter Kratzer
Nov 6, 2013·The Journal of Physical Chemistry. a·Audrey SégerieYi Luo

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