Separation of Electron-Transfer and Coupled Chemical Reaction Components of Biocatalytic Processes Using Fourier Transform ac Voltammetry

2005 ◽  
Vol 77 (11) ◽  
pp. 3502-3510 ◽  
Author(s):  
Barry D. Fleming ◽  
Jie Zhang ◽  
Alan M. Bond ◽  
Stephen G. Bell ◽  
Luet-Lok Wong
Keyword(s):  
Electron Transfer ◽  
Fourier Transform ◽  
Chemical Reaction ◽  
Ac Voltammetry ◽  
Fourier Transform Ac Voltammetry

scholarly journals Probing biological redox chemistry with large amplitude Fourier transformed ac voltammetry

2017 ◽  
Vol 53 (69) ◽  
pp. 9519-9533 ◽  
Author(s):  
Hope Adamson ◽  
Alan M. Bond ◽  
Alison Parkin
Keyword(s):  
Fourier Transform ◽  
Large Amplitude ◽  
Redox Chemistry ◽  
Ac Voltammetry ◽  
Fourier Transform Ac Voltammetry ◽  
Insight Into

A review of the insight into biological redox chemistry which has been enabled by the development of large amplitude Fourier transform ac voltammetry.

scholarly journals Photoredox Reaction of trans-4-Stilbenecarboxylatopentaamminecobalt(III)

1979 ◽  
Vol 34 (2) ◽  
pp. 271-274 ◽  
Author(s):  
Arnd Vogler ◽  
Alfred Kern
Keyword(s):  
Electron Transfer ◽  
Chemical Reaction ◽  
Oxidation Product ◽  
Redox Reaction ◽  
Excited Singlet ◽  
Low Complex

AbstractThe irradiation (λ = 313 nm) of aqueous [Co(III)(NH3)5TSC]2+(TSC-= trans-4-stilbenecarboxylate) leads to a redox reaction with formation of Co2+ as has been shown previously. The TSC-ligand is oxidized to the radical in the primary photoreaction. At higher complex concentrations (～10-2 M) this TSC radical is oxidized to stable products (Φ = 0.09 ± 0.02) by [Co(NH3)5TSC]2+,which is reduced to Co2+ leading to release of the TSC- ligand (Φ = 0.07 ± 0.02). Co2+ is thus formed by both the secondary and the primary photo chemical reaction (Φ overall = 0.16). At low complex concentrations (< 10-4 M) in the presence of air, the primary TSC radical is scavenged by O2. Benz-aldehyde is an oxidation product. This reduces the formation of Co2+ to Φ = 0.09 ± 0.02, which is taken to be the efficiency of the primary photo chemical step. It is suggested that the photoredox reaction is initiated by an electron transfer from the first excited singlet of the TSC- ligand. As shown by sensitization experiments, the population of the lowest TSC-triplet leads to the usual trans/cis isomerization of the TSC-ligand, but not to the redox reaction.

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