Electrooxidation in Pyridine at Pyrolytic Graphite Electrode.

Abstract

It is useful to change the place of (ir) from the sum to the derivative of the concentration. This is permissible because of the properties of the Laplace transformation. Substituting Equation 46into Equation 45and changing the place of t as indicated results in the final equation:Equation 47 represents the first theoretical description of the currentpotential curve for a rotating disk electrode when the potential varies linearly with time and the current varies as a function of the potential. This equation is reduced to that for the stationary electrode case when = <*> (7). The integral indicated in Equation 47 must be computed numerically. LITERATURE CITED(1) Bowers, R.

Photoinduced Electron Transfer from ZrOCo Binuclear Light Absorber to Pyridine Elucidated by Transient Optical and Infrared Spectroscopy

“…The 403 nm maximum of the transient absorption is in agreement with literature reports according to which the π–π* transition of pyridine radical anion between 300 and 400 nm is shifted toward the long-wavelength end of this range when interacting with electron-rich, large metal centers such as Zr. − Furthermore, the ratio of 20:1 for the observed peak intensity of the 403 nm growth and the 500–650 nm bleach (Figure ) agrees reasonably well with reported extinction coefficients of pyridine radical anion of 2000 L mol –1 cm –1 and overlapping tetrahedral Co II d–d (200 L mol –1 cm –1 ) and Co III d–d (50 L mol –1 cm –1 ). , A conceivable alternative charge transfer process, namely hole transfer from transient Co III to pyridine, is ruled out by the observed simultaneous growth of the 403 nm intermediate and the bleach of Co II . The absence of hole transfer to pyridine is to be expected because pyridine is known to be exceptionally resistant to one-electron oxidation . Further evidence that pyridine radical cation is not formed is provided by the infrared results.…”

“…The absence of hole transfer to pyridine is to be expected because pyridine is known to be exceptionally resistant to one-electron oxidation. 49 Further evidence that pyridine radical cation is not formed is provided by the infrared results. Gas phase pyridine radical cations dissociate readily to HCN and 1,3-butadiene cation radical, [50][51][52][53] which would readily be visible by FT-IR monitoring; no characteristic infrared band of a cyano group is detected.…”

Intramolecular CH/OH Bond Cleavage with Water and Alcohol Using a Phosphine‐Free Ruthenium Carbene NCN Pincer Complex

“…Ideally, suitable catalyst candidates for water splitting do not contain oxidizable donor atoms, such as phosphines, that might readily react with H 2 O7 or O 2 8 (2H 2 O→2H 2 +O 2 ; E rxn =−1.23 V vs. SHE). Although the standard oxidation potential of pyridine is +1.6 V (versus 1 M Ag/AgNO 3 ),9 pyridine‐containing chelates are widely used for the catalytic oxidation of H 2 O to O 2 by using a sacrificial reductant 10. Furthermore, research into the oxidation of N‐heterocyclic carbenes (NHCs) is limited, with a few known examples involving free NHCs11 and some NHC ligands bound to Cu12 and Rh13 capable of being oxidized in the presence of O 2 .…”

Heteropoly 12-metallophosphates containing tungsten and vanadium. Preparation, voltammetry, and properties of mono-, di-, tetra-, and hexavanado complexes

“…(3) Holder of an NSF Summer Award to Secondary School Teachers, 1965-1966NIH Predoctoral Fellow, 1966-1968 (4) Author to whom correspondence should be addressed.…”