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Spectral, photophysical and photochemical properties of tetra- and octaglycosylated zinc phthalocyanines

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Abstract

Photophysical and photochemical properties of a series of tetra- and octaglycosylated zinc phthalocyanines (ZnPcs) substituted with glucose and galactose moieties have been reported. Spectral properties of these phthalocyanines are compared in DMSO. Absorption spectra of the non-peripherally tetra-substituted ZnPcs 2 showed a significant red shift in their Q-band maxima as compared to the peripherally substituted analog 1. All the complexes gave high triplet quantum yields ranging from 0.68 to 0.88, whereas triplet lifetimes were in the range of 100–430 µs in argon-saturated solutions. The octagalactosylated ZnPc 3b showed the highest triplet quantum yield and singlet oxygen quantum yield of 0.88 and 0.69, respectively. The fluorescence quantum yields and lifetimes of all the compounds under investigation were within the range of zinc phthalocyanine complexes.

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Authors and Affiliations

  1. Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa

    Zafar Iqbal, Nkosiphile Masilela & Tebello Nyokong

  2. Institut fuer Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tuebingen, Germany

    Alexey Lyubimtsev, Michael Hanack & Thomas Ziegler

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  1. Zafar Iqbal
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  2. Nkosiphile Masilela
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  3. Tebello Nyokong
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  6. Thomas Ziegler
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Correspondence to Tebello Nyokong.

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Iqbal, Z., Masilela, N., Nyokong, T. et al. Spectral, photophysical and photochemical properties of tetra- and octaglycosylated zinc phthalocyanines. Photochem Photobiol Sci 11, 679–686 (2012). https://doi.org/10.1039/c2pp05348a

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