title: Spectroelectrochemical determination of the electron consumption.
abstract: Measurements of UV-vis spectra as a function of the consumed charge in an optically transparent thin layer cell (OTTLE) offer a fast, small-volume and reliable method for the determination of the number of electrons n exchanged in the redox reaction. The determination of n is based on the calibration procedure using the ferrocene oxidation and the methyl viologen reduction. Virtues of this method are demonstrated on the determination of n of two oligomers of 'extended viologens' with multiple redox centers and correspondingly large n. The described method eliminates problems of side reactions of reactive intermediates with the parent oxidized form, which often impede a reliable estimation of n by the established coulometric method.
authors.affiliation: J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
authors.forename: Viliam
authors.initials: V
authors.lastname: Kolivoška
authors.forename: Miroslav
authors.initials: M
authors.lastname: Gál
authors.forename: Stěpánka
authors.initials: S
authors.lastname: Lachmanová
authors.forename: Michal
authors.initials: M
authors.lastname: Valášek
authors.forename: Magdaléna
authors.initials: M
authors.lastname: Hromadová
authors.forename: Lubomír
authors.initials: L
authors.lastname: Pospíšil
mesh_terms: D004563:Electrochemistry / Q000379:methods*; D004572:Electrolysis; D004583:Electrons; D005296:Ferrous Compounds / Q000737:chemistry; D000075163:Metallocenes; D008970:Molecular Weight; D055620:Optical Phenomena; D010084:Oxidation-Reduction; D010269:Paraquat / Q000737:chemistry; D013057:Spectrum Analysis; D014867:Water / Q000737:chemistry
chemical_list: D005296:Ferrous Compounds; D000075163:Metallocenes; D014867:Water; D010269:Paraquat; C004998:ferrocene