title: Time-resolved study of the oxidation of ethanol by cerium(IV) using combined quick-XANES, UV-vis, and Raman spectroscopies.
abstract: Time-resolved X-ray absorption spectroscopy (Quick-XANES) has been combined with UV-vis and Raman spectroscopies to study the in situ reduction of Ce4+ to Ce3+ in ethanolic solution with a time resolution of ca. 4-5 s. For this purpose, a cam-driven oscillating double-crystal monochromator with a channel-cut crystal was combined with two spectrometers for UV-vis and Raman spectroscopies in a specialized cell which allows one to fit the optical pathways for all three spectroscopies individually. The results show that high-quality results can be obtained simultaneously, thus giving a detailed insight into the mechanisms of the investigated chemical reaction. The continuous release of nitrate and ethanol ligands from the initial Ce4+ into the solution finally leads to a trivalent cerium species which is only coordinated with water molecules after about 1800 s of reaction time.
authors.affiliation: LURE, Centre universitaire Paris-Sud, BP34, F-91898 Orsay Cedex, France.
authors.forename: V
authors.initials: V
authors.lastname: Briois
authors.forename: D
authors.initials: D
authors.lastname: Lützenkirchen-Hecht
authors.forename: F
authors.initials: F
authors.lastname: Villain
authors.forename: E
authors.initials: E
authors.lastname: Fonda
authors.forename: S
authors.initials: S
authors.lastname: Belin
authors.forename: B
authors.initials: B
authors.lastname: Griesebock
authors.forename: R
authors.initials: R
authors.lastname: Frahm