Self-assembled monolayer of L-cysteine on Au(111): Hydrogen exchange between zwitterionic L-cysteine and physisorbed water
SCIE
SCOPUS
- Title
- Self-assembled monolayer of L-cysteine on Au(111): Hydrogen exchange between zwitterionic L-cysteine and physisorbed water
- Authors
- Shin, T; Kim, KN; Lee, CW; Shin, SK; Kang, H
- Date Issued
- 2003-10-23
- Publisher
- AMER CHEMICAL SOC
- Abstract
- A self-assembled monolayer (SAM) Of L-cysteine [HSCH2CH(NH2)COOH] was prepared on a Au(1 11) surface by vapor deposition in ultrahigh vacuum and was characterized by techniques of temperature-programmed desorption (TPD), Cs+ reactive ion scattering (Cs+ RIS), and low-energy secondary ion mass spectrometry (LESIMS). Analysis of the amino acid functional groups of SAM indicated that L-CySteine molecules exist in the zwitterionic form. Upon physisorption of the D2O overlayer on the SAM, the -NH3+ functional group of cysteine readily exchanges their H atoms with D2O in the temperature range 125-230 K. The H/D exchange of the -NH3+ group sequentially occurs with D2O molecules that are directly hydrogen-bonded to the SAM, and the long-range proton transfer to the upper layer water molecules does not occur. Temperature-programmed reaction study and kinetic analysis yielded an activation energy of 13 +/- 1 kJ mol(-1) for the H/D exchange reaction, which suggests proton tunneling as a mechanism.
- Keywords
- SCANNING-TUNNELING-MICROSCOPY; MASS-SPECTROMETRY; 3-MERCAPTOPROPIONIC ACID; REACTIVE SCATTERING; ORGANIC-SURFACES; PROTON-TRANSFER; AMINO-ACIDS; GOLD; GLYCINE; MOLECULES
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/18286
- DOI
- 10.1021/JP030314J
- ISSN
- 1520-6106
- Article Type
- Article
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY B, vol. 107, no. 42, page. 11674 - 11681, 2003-10-23
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