Electrochemical behaviour of amino acids on Pt(h, k, l): a voltammetric and in situ FTIR study. Part II. Serine and alanine on Pt(111)

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Title: Electrochemical behaviour of amino acids on Pt(h, k, l): a voltammetric and in situ FTIR study. Part II. Serine and alanine on Pt(111)
Authors: Huerta Arráez, Francisco | Morallon, Emilia | Cases Iborra, Francisco Javier | Rodes García, Antonio | Vázquez Picó, José Luis | Aldaz Riera, Antonio
Research Group/s: Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad Politécnica de Valencia. Departamento de Ingeniería Textil
Keywords: Spectroelectrochemical study | Platinum electrodes | Serine | Alanine | Adsorbed cyanide
Knowledge Area: Química Física
Date Created: 14-Mar-1997
Issue Date: 15-Jul-1997
Publisher: Elsevier
Citation: HUERTA ARRÁEZ, Francisco, et al. "Electrochemical behaviour of amino acids on Pt(h, k, l): a voltammetric and in situ FTIR study. Part II. Serine and alanine on Pt(111)". Journal of Electroanalytical Chemistry. Vol. 431, Issue 2 (15 July 1997). ISSN 0022-0728, pp. 269-275
Abstract: A spectroelectrochemical study of the adsorption and oxidation of serine and alanine on Pt(111) electrodes has been carried out in 0.1 M HClO4 solutions. From the voltammetric and FTIR spectroscopic results, we concluded that adsorbed cyanide is formed at the Pt(111) surface as a product of serine and alanine oxidation. In the case of serine, adsorbed cyanide is detected at potentials above 0.4 V, whereas a higher potential is needed in the case of alanine. Linear and multibonded CO have also been detected as poisoning species during serine oxidation. These adsorbed species have been isolated by irreversible adsorption experiments of amino acids. Dissolved CO2 has been found by FTIR spectroscopy as an oxidation product of both amino acids. The role played by the R group in the electrochemical behaviour of these molecules is significant. Reversibly adsorbed serinate and alaninate anions have been also detected. As in the case of the anions present in glycine solutions, the serinate and alaninate anions are two-fold coordinated to the Pt(111) surface through the carboxylate group.
Sponsor: Generalitat Valenciana; DGCYT (PB93/0944).
URI: http://hdl.handle.net/10045/7802
ISSN: 0022-0728
DOI: 10.1016/S0022-0728(97)00212-X
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/S0022-0728(97)00212-X
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