Solvent effect on photoinduced electron transfer between C₆₀and 3,3′,5,5′-tetramethylbenzidine studied by nanosecond laser photolysis

Efficient photoinduced electron transfer between C60/C70 and zinc octaethylporphyrin studied by nanosecond laser photolysis method

“…Figure 2 shows the transient absorption spectra in the visible and near-IR regions observed using 532 nm laser light to excite predominantly ZnOEP. The sharp absorption peak at 780 nm is attributed to 3 ZnOEP*, while the absorption band appearing at 1080 nm with the decay of 3 ZnOEP* is due to C ÁÀ 60 [18][19][20][21]. The rise curve of C ÁÀ 60 seems to be slightly faster than the decay of 3 ZnOEP* because of the initial fast rise of C ÁÀ 60 due to the scattered light.…”

Homogeneous catalysis: Kinetics and mechanism of oxidation of Ru(II) sensitizers by inorganic peroxides

“…Similar trend was observed for all the peroxides used. Table 1 Dependence of rate on [Ru(dcbpy) 2 Table 2 Dependence Effect of the oxidant…”

The use of a photoinduced electron-transfer reaction for optical limiting in fullerene-containing solutions

“…In nonpolar solvents, the rate constant of photoinduced electron transfer was higher than that in polar solvents. Ito et al [11,12] related this fact to the formation of weak ground-state complexes ( ë 60 -D) without changes in the total absorption spectrum. This assumption is consistent with conclusions based on the theory of multicomponent solutions [13].…”

“…Solvent polarity also affects the mechanism and efficiency of photoinduced electron transfer. For example, Ito et al [11,12] observed the effective formation of in ë 60 solutions in various solvents in the presence of N , N , N ', N '-tetramethylbenzidine (NTMB) [11] and TMB [12] by excitation with laser radiation ( λ = 532 nm; ∆ t = 6 ns). It was found that photoinduced transfer in polar solvents occurred through the triplet state of ë 60 in accordance with the following reaction scheme:…”

“…It is most likely that the efficiency of limitation in solution I, as compared with the initial solution of ë 60 in toluene, decreased because of the deactivation of triplet ë 60 molecules by an electron donor. It is likely that compensation is due to additional absorption of exciting radiation at the edge of the radical cation absorption band ( λ max = 470 nm [12]) with increasing TMB concentration (solution II). In contrast, the limitation efficiency in solution III was much higher than in solutions 0-II.…”