Temperature effects in the enantiomeric electro-oxidation of D- and L-glucose on Pt{643}(S)

Citation
Ga. Attard et al., Temperature effects in the enantiomeric electro-oxidation of D- and L-glucose on Pt{643}(S), J PHYS CH B, 103(9), 1999, pp. 1381-1385
Citations number
17
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF PHYSICAL CHEMISTRY B
ISSN journal
15206106 → ACNP
Volume
103
Issue
9
Year of publication
1999
Pages
1381 - 1385
Database
ISI
SICI code
1520-6106(19990304)103:9<1381:TEITEE>2.0.ZU;2-5
Abstract
The temperature dependence of the enantioselective adsorption of D- and L-g lucose on a chiral Pt{643}(S) electrode is reported. The contribution to th e electro-oxidation current of the initial adsorption of the glucose molecu le on {111} terrace sites is used to determine a difference in the activati on energy of adsorption between D- and L-glucose on Pt{643}(S). A value of approximately 1.4 kJ mol(-1) is obtained, When this value is converted into a diastereomeric product ratio, the mole percentage of the major product i s evaluated as being 64%. Although small, it is speculated that optimizatio n of the average terrace width of the chiral electrode surface will lead to an increase in the stereoselectivity of the reaction. These measurements c onstitute the first quantitative determination of enantiomeric selectivity at a metal electrode in the absence of a chiral promoter.