Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 222, Issue 2-3, Pages 343-350Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2011.07.007
Keywords
Phthalocyanine; 1,6-Hexanedithiol; Gold nanoparticles; Triplet state quantum yields; Fluorescence lifetimes
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Funding
- Department of Science and Technology (DST)
- National Research Foundation (NRF), South Africa through DST/NRF South African Research Chairs Initiative
- Rhodes University
- Medical Research Council of South Africa
- DAAD foundation
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The peripherally tetra substituted zinc phthalocyanine with 1,6-hexanedithiol as substituent (THdTZnPc, 3) was synthesized and is reported for the first time in this work. The potential of this zinc complex as a suitable photosensitizer for use in photodynamic therapy was determined through the investigation of the photophysical and photochemical properties. In this work complex 3 is attached to gold nanoparticles through the terminal thiol groups of the phthalocyanine resulting in a 3-AuNP conjugate whose photophysicochemical properties are investigated. Fluorescence lifetimes were determined using time correlated single photon counting and they show an increase in the abundance of the monomeric species (tau(2)) for the Pc in the 3-AuNP conjugate: similar to 1 and 0.71 (with respective lifetimes 2.69 ns and 2.86 ns) compared to the free complex 3 with abundances of 0.12 and 0.13 (with respective lifetimes 3.36 ns and 3.28 ns) in DMSO and DMF, respectively. (C) 2011 Elsevier B.V. All rights reserved.
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