Photoinduced electron-transfer and magnetic-field effects on the decay rates of photogenerated biradicals in a phenothiazine-C60 linked compound with six methylene groups: temperature dependence

Reverse phenomena of magnetic field effects and time-resolved EPR spectra in the photogenerated biradical from intramolecular electron-transfer in a phenothiazine–C60linked compound with a semi-rigid spacer

“…The MFEs have been powerful for verifying the mechanism in photochemical reactions. We have examined photoinduced electron-transfer reactions and MFEs on the photogenerated biradicals in phenothiazine (Ph)-C 60 and zinc-tetraphenylporphyrin (ZnP)-C 60 linked compounds with different methylene groups (-(CH 2 ) n -) (Ph(n)C 60 (n = 4, 6, 8, 10, 12) [9][10][11][12][13][14] and ZnP(n)C 60 (n = 4, 8)) [15,16] (Scheme 1) and a rutheniumtetraphenylporphyrin-C 60 ligand complex [17]. In both D-C 60 linked compounds, the decay rate constant (k d ) of the photogenerated biradical decreased in lower magnetic…”

Bioactive Phenothiazines and Benzo[a]phenothiazines: Spectroscopic Studies, and Biological and Biomedical Properties and Applications

“…Several applications have been proposed recently for the use of phenothiazines in various fields, such as materials chemistry [77,78], magnetic field effects on fullerene-phenothiazine linked compounds [79,80] and fluorescent labelling [81].…”

“…Magnetic field effects (MFEs) and photoinduced intramolecular electrontransfer studies were performed in fullerene-phenothiazine and C 60 -phenothiazine linked compounds [79,80]. Transient absorption spectra of fullerene-phenothiazine linked compounds indicated that the photoinduced intramolecular electron transfer took place in benzonitrile, but not in benzene.…”

“…The long lifetime could be ascribed to the spin multiplicities of the biradical [79]. In a further investigation, photoinduced electron-transfer reactions and MFEs on the decay of a photogenerated biradical in a phenothiazine-C 60 linked compound with six methylene groups were examined in benzonitrile at various temperatures (283-343 K) [80]. The decay rate constants of the biradicals were dramatically decreased in the lower magnetic fields (0-0.2 T) and increased in the higher magnetic fields (0.2-1.0 T).…”

Magnetic field effects on photoelectrochemical reactions of modified electrodes with C60-phenothiazine nanoclusters

“…From these considerations, we have examined photoinduced electron-transfer reactions and MFEs on the photogenerated biradicals in phenothiazine(Ph)-C 60 [16][17][18][19][20] and zinc-tetraphenylporphyrin (ZnP)-C 60 [21,22] linked compounds and found novel MFEs on the photogenerated biradicals in benzonitrile.…”