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Citation: Li Xi-You, Tian Hong-Jian, Zhou Qing-Fu, Xu Hui-Jun. The Photophysical Process of A New Kind of Porohyrin-Phthalocyanine Heterodimer[J]. Acta Physico-Chimica Sinica, ;1997, 13(01): 11-15. doi: 10.3866/PKU.WHXB19970103 shu

The Photophysical Process of A New Kind of Porohyrin-Phthalocyanine Heterodimer

1.
Institute of Photographic Chemistry,Academia Sinica,Beijing 100101

Received Date: 2 June 1996
Available Online: 15 January 1997

Intramolecular energy-transfer and electron-transfer of porphyrin-phthalocyanine heterodimer, linked by piperazine, were investigated by absorption and fluorescencc spectroscopy. The efficiency of energy transfer(ФEnT) and electron transfer (ФET) were calculated. The results indicate that: In benzene, the main photophysical process is excited singlet-singlet energy transfer, while in DMF photoinduced electron transfer predominant. The ФET of this heterodimer in DMF is bigger than that of porphyrin-phthalocyanine heterodimers linked by oxygen or flexible chains. This may be ascribed to the "boat-form" conformation of piperazine, According to the CPK molecular model, porphyrin and phthalocyanine are held together in a face to face way, and the center to center distance between two macrorings is about 3.56 Å . It is suggested that conformational changes from "chair form" to "boat form" occurred subsequent to optical excitation in DMF.
- Piperazine,
- Heterodimer,
- Intramolecular energy transfer,
- Photoinduced electron transfer
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