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The photochemistry and photophysics of a series of non-peripherally substituted zinc phthalocyanines

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Abstract

Photophysical and photochemical measurements have been made on a series of novel non-peripherally octa(alkyl-substituted) zinc phthalocyanines. Fluorescence quantum yields and lifetimes, triplet quantum yields and lifetimes and singlet delta oxygen quantum yields were measured in 1% v/v pyridine in toluene. The effects of alkyl substituents and increasing chain length relative to the unsubstituted parent molecule, zinc phthalocyanine (ZnPc), are discussed. ZnPc with alkyl substituents of chain length 5–15 carbons exhibited similar absorption and emission maxima (704 nm and 718 nm respectively) with the molar absorptivity of the Q-band ~105 M−1 cm−1. The series of compounds also exhibited triplet quantum yields of 0.78–0.84 and singlet oxygen quantum yields of 0.67–0.71.

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Authors and Affiliations

  1. School of Chemistry, University of East Anglia, Norwich, UK, NR4 7TJ

    Magda van Leeuwen & Stephen H. Ashworth

  2. Department of Chemistry, Durham University, University Science Laboratories, South Road, Durham, UK, DH1 3LE

    Andrew Beeby

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  1. Magda van Leeuwen
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  2. Andrew Beeby
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  3. Stephen H. Ashworth
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Correspondence to Stephen H. Ashworth.

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van Leeuwen, M., Beeby, A. & Ashworth, S.H. The photochemistry and photophysics of a series of non-peripherally substituted zinc phthalocyanines. Photochem Photobiol Sci 9, 370–375 (2010). https://doi.org/10.1039/b9pp00107g

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