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Citation: Liu Jian-Bo, Zhao Fu-Qun, Zhao Yu, Zhang Fu-Shi, Tang Ying-Wu, Song Xin-Qi, Chau Footim. Substituent Dependence of Photophysical Properties for Free-base Phthalocyanines[J]. Acta Physico-Chimica Sinica, ;1996, 12(06): 491-495. doi: 10.3866/PKU.WHXB19960603 shu

Substituent Dependence of Photophysical Properties for Free-base Phthalocyanines

1.
Department of Chemistry,Tsinghua University,Beijing 100084

Received Date: 24 September 1995
Available Online: 15 June 1996

A series of soluble 2,9,16,23-tetrasubstituted free-base phthalocyanines were synthesized and studied spectroscopically. The lowest electronic transition energy and the lowest excited singlet state energy of the phthalocyanines substituted with alkyl, alkoxy and aryloxy groups can be correlated well with the Hammett's meta-directing group effect. While the strong electron-withdrawing group (nitro) and the strong electron-donating group (amino) may induce intense intramolecular charge-transfer which results in the formation of aggregates, marked distortion of the absorption spectra and quenching of the excited states. However, all the substituents have less influence on the vibrational level.
- Phthalocyanine,
- Charge-transfer,
- Aggregate,
- Hammett correlation
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