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Citation: Chen De-Wen, Wang Hai, Zhou Jian-Wei, Yang Yu-Kun, Xu Guang-Zhi. ESR Studies for the Photoinduced Electron Transfer of the Phthalocyanine-Paraquat Systems[J]. Acta Physico-Chimica Sinica, ;1995, 11(04): 325-330. doi: 10.3866/PKU.WHXB19950408 shu

ESR Studies for the Photoinduced Electron Transfer of the Phthalocyanine-Paraquat Systems

1.
The State Key Laboratory for Structural Chemistry of Unstable and Stable Species,Institute of Chemistry,Academia Sinica,Beijing 100080

Received Date: 4 April 1994
Available Online: 15 April 1995

Photoinduced electron transfer of metal-phthalocyanine MPc (M=Zn, Mg, Fe, Co, Cu) dispersions in the presence of electron acceptors such as paraquat (4,4’-[-1,4-phenylene-]-Bis-[-N-alkyl(oraryl)-2,6-(diphenyl-]-pyridinium perchlorates, i.e. PQ2+) has been studied by means of ESR spectroscopy. The results show that, when irradiated with visible light, electron in valence band (VB) of photoconductor can be excited to conduction band (CB) to form an electron-hole pair and the electron may transfer from CB to PQ2+ to produce a radical cation PQ, then a weak ESR signal was observed. As in the presence of cationic surfactant Chloro-Tetradecyl-Pridium, as well as of hole-quencher TEA or EDTA, the strength of ESR signal can be enhanced by 5~6 times as much or more. While in the presence of oxygen in the system, the signal of PQ+ radical disappeared and superoxide radical anion O2- was detected. It is obvious that the existence of oxygen might seriously hinder the process of photoinduced electron transfer.
- Phthalocyanine,
- Paraquat,
- Electron transfer,
- ESR
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