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http://dx.doi.org/10.5012/bkcs.2009.30.2.441

Formation and Structure of Self-Assembled Monolayers of Octylthioacetates on Au(111) in Catalytic Tetrabutylammonium Cyanide Solution  

Park, Tae-Sung (Department of Chemistry, Hanyang University)
Kang, Hun-Gu (Department of Chemistry, Hanyang University)
Choi, In-Chang (Department of Chemistry, Hanyang University)
Chung, Hoe-Il (Department of Chemistry, Hanyang University)
Ito, Eisuke (Flucto-order Functions Asian Collaboration Team)
Hara, Masahiko (Department of Electronic Chemistry, Tokyo Institute of Technology)
Noh, Jae-Geun (Department of Chemistry, Hanyang University)
Publication Information
Bulletin of the Korean Chemical Society / v.30, no.2, 2009 , pp. 441-444 More about this Journal
Abstract
The formation and structure of self-assembled monolayers (SAMs) by the adsorption of acetyl-protected octylthioacetate (OTA) on Au(111) in a catalytic tetrabutylammonium cyanide (TBACN) solution were examined by means of scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV). Molecular-scale STM imaging revealed that OTA molecules on Au(111) in a pure solvent form disordered SAMs, whereas they form well-ordered SAMs showing a c(4 × 2) structure in a catalytic TBACN solution. XPS and CV measurements also revealed that OTA SAMs on Au(111) formed in a TBACN solution have a stronger chemisorbed peak in the S 2p region at 162 eV and a higher blocking effect compared to OTA SAMs formed in a pure solvent. In this study, we clearly demonstrate that TBACN can be used as an effective deprotecting reagent for obtaining well-ordered SAMs of thioacetyl-protected molecules on gold.
Keywords
Octylthioacetate; Tetrabutylammonium cyanide; Self-assembled monolayers; Scanning tunneling microscopy; X-ray photoelectron spectroscopy;
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