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Issue 17, 2010
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Relative stability of thiol and selenol based SAMs on Au(111) — exchange experiments

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Abstract

Two fully analogue homologue series of thiol and selenol based aromatic self-assembled monolayers (SAMs) on Au(111) in the form of CH3–(C6H4)2–(CH2)n–S–Au(111) (BPnS/Au(111), n = 2–6) and CH3–(C6H4)2–(CH2)nSeAu(111) (BPnSe/Au(111), n = 2–6), respectively, have been used to elucidate the relative stability of the S–Au(111) and Se–Au(111) bonding by monitoring their exchange by alkanethiol and alkaneselenol molecules from their respective solutions. The exchange process was monitored using infrared reflection absorption spectroscopy (IRRAS). Two main results obtained by these study are: (1) the selenium-based BPnSe/Au(111) series is significantly more stable than their sulfur analogues; (2) a clear odd–even effect exists for the stability of both BPnS/Au(111) and BPnSe/Au(111) SAMs towards exchange processes with the even-numbered systems being less stable. The results obtained are discussed in view of previously reported microscopic and spectroscopic data of the same SAMs addressing the issue of the relative stability of S–Au(111) and Se–Au(111) bonding, which is an important factor for the rational design of SAMs.

Graphical abstract: Relative stability of thiol and selenol based SAMs on Au(111) — exchange experiments

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Publication details

The article was received on 05 Nov 2009, accepted on 02 Feb 2010 and first published on 24 Feb 2010


Article type: Paper
DOI: 10.1039/B923274P
Phys. Chem. Chem. Phys., 2010,12, 4400-4406

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    Relative stability of thiol and selenol based SAMs on Au(111) — exchange experiments

    K. Szelągowska-Kunstman, P. Cyganik, B. Schüpbach and A. Terfort, Phys. Chem. Chem. Phys., 2010, 12, 4400
    DOI: 10.1039/B923274P

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