Ferrocenylalkylthiolates as a probe of heterogeneity in binary self-assembled monolayers on gold

Langmuir : the ACS Journal of Surfaces and Colloids
Lawrence Yoon Suk LeeR Bruce Lennox

Abstract

The oft-cited complexity of tethered ferrocene electrochemistry in single component (FcRS-) or binary (FcRS-/CH3R'S-) self-assembled monolayers (SAMs) on gold has been investigated. The complex voltammetry is shown to be linked to local electrostatics caused by the formation of the ferrocenium ion. This conclusion is reached by studying model effects in binary SAMs, where a cationic alkylthiolate (H3N+ C11S-Au) is mixed with FcC12S-Au. A fitting procedure involving both a Gaussian and a Lorentzian distribution is used for deconvolution of the two peaks which are consistently observed in the SAMs when chi(Fc)surf > or = 0.2. The lower-potential (E degrees ' = 250 mV) and higher-potential (E degrees ' = 350 mV) voltammetric peaks are assigned to Fc moieties in "isolated" and "clustered" states, respectively. Use of this method to better understand SAM structure is demonstrated by distinguishing the degree of homogeneity in two binary SAMs of similar composition.

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Citations

Nov 26, 2009·Journal of the American Chemical Society·Christian A NijhuisGeorge M Whitesides
Jul 22, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Yann R LerouxPhilippe Hapiot
Oct 19, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Micheál D ScanlonEdmond Magner
May 6, 2010·Chemical Communications : Chem Comm·Hyun Joo JungTaek Dong Chung
Jan 9, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Eric R DionneAntonella Badia
Sep 26, 2014·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Toshikazu KitagawaKoichi Komatsu
Feb 24, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Cheng JiangJ Justin Gooding
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Mar 28, 2008·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Tesfaye Refera SoretaCiara K O'Sullivan
Mar 17, 2015·Chemical Communications : Chem Comm·Joshua LehrJason J Davis
Feb 16, 2007·Physical Chemistry Chemical Physics : PCCP·Lawrence Yoon Suk Lee, R Bruce Lennox
Jan 28, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Rylan B StolarJeffrey L Shepherd
Jan 23, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Amélie ForgetVéronique Balland
Aug 9, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·David T ValleyAlexander V Benderskii
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Feb 26, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Birgit NagelMartin Katterle
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Nov 3, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Amanda L EckermannThomas J Meade
Oct 3, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Md Shamim Iqbal, Wei Zhan

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