Reactions of ¹⁸F Recoil Atoms in Gaseous CF₃—CF₃ and CF₃—CF₂H

Effect of charge transport in electrode-confined N,N'-dialkyl-4,4'-bipyridinium polymers on the current-potential response for mediated, outer-sphere electron-transfer reactions

“…That is, without charge-transport limitation in the polymer we would have expected a mass-transport-limited reduction of Fe(phen)33+ at least 400 mV positive of where it is actually observed in Figure 4. Whenever charge transport through the fully reduced polymer limits the steady-state reduction current, eq 9 gives the steady-state current that can pass through a polymer i = nFADqjCj / d (9) thickness, d, having a diffusion coefficient for charge transport of Z>cx.55 In eq 9, n, F, and A (projected area) have their usual meaning; Cy is the concentration of the charge-carrying species in the polymer in mol/cm3. When the polymer is not fully reduced the steady-state reduction current is expected to depend linearly on the [PQ+] concentration at the electrode/polymer interface.55 This gives rise to the potential dependence given in Figure 5, since [PQ+] varies according to the Nernst equation.…”

“…The [Fe(tj5-C5H5)2]PF6 was prepared by dissolution of ferrocene in concentrated H2S04, followed by stirring for 15 min in air. The blue solution was poured (9) Dominey, R. N.; Lewis, T. J.; Wrighton, M. S. J. Phys. Chem.…”

Recoil fluorine-18 chemistry. 14. High-pressure investigation of perfluoroethane (C2F6)

“…That is, without charge-transport limitation in the polymer we would have expected a mass-transport-limited reduction of Fe(phen)33+ at least 400 mV positive of where it is actually observed in Figure 4. Whenever charge transport through the fully reduced polymer limits the steady-state reduction current, eq 9 gives the steady-state current that can pass through a polymer i = nFADqjCj / d (9) thickness, d, having a diffusion coefficient for charge transport of Z>cx.55 In eq 9, n, F, and A (projected area) have their usual meaning; Cy is the concentration of the charge-carrying species in the polymer in mol/cm3. When the polymer is not fully reduced the steady-state reduction current is expected to depend linearly on the [PQ+] concentration at the electrode/polymer interface.55 This gives rise to the potential dependence given in Figure 5, since [PQ+] varies according to the Nernst equation.…”