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Effect of substituents on solubility of Zn (II) and Al (III) phthalocyanines

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Document pages: 7 pages

Abstract: The water solubility of phthalocyanine (PCS) is usually increased by introducing charged or carboxyl substituents at the periphery of the macrocycle. Therefore, this structural change affects their photophysical and photochemical properties as photosensitizers. In order to evaluate the spectral and photophysical effects of these side residues on the properties of chromophores, phthalocyanines (water-soluble phthalocyanines) substituted by four or eight terminal carboxyl groups and with additional eight positive charges in some cases were studied. The quantum yield, triplet absorption and transient absorption spectra of singlet oxygen () were measured and correlated with the structure of substituents. The results show that charged substituents do existot change the quantum yields of generation but decrease its lifetimes. The introduction of the charged substituents not only increases the water solubility but also significantly changes absorption, fluorescence, and transient absorption spectra of water soluble Pcs.

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