Enhanced triplet state yields in aqueous media of asymmetric zinc phthalocyanines when conjugated to silver nanoflowers

Triplet state behavior of water soluble zinc phthalocyanines containing three 2-[2-(2-ethoxyethoxy)ethoxy]-1-[2-((2-ethoxyethoxy)-ethoxy) methyl] ethoxy and one aminoethoxy or 2-(2-(2-ethoxyamino)-2-oxoethoxy) acetic acid groups at non-peripheral positions improves in the presence of silver nanoflow...

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Bibliographic Details
Published in:Polyhedron 2015-11, Vol.100, p.296-302
Main Authors: D’Souza, Sarah, George, Reama, Göksel, Meltem, Atilla, Devrim, Durmuş, Mahmut, Nyokong, Tebello
Format: Article
Language:English
Subjects:
Photodynamic therapy
Silver nanoparticles
Singlet oxygen quantum yield
Triplet quantum yield
Zinc phthalocyanine
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Summary:Triplet state behavior of water soluble zinc phthalocyanines containing three 2-[2-(2-ethoxyethoxy)ethoxy]-1-[2-((2-ethoxyethoxy)-ethoxy) methyl] ethoxy and one aminoethoxy or 2-(2-(2-ethoxyamino)-2-oxoethoxy) acetic acid groups at non-peripheral positions improves in the presence of silver nanoflowers. [Display omitted] Novel low symmetry water-soluble zinc phthalocyanines (ZnPcs, complexes 1 and 2) were synthesized and then mixed with silver nanoflowers. Photophysical and photochemical studies were performed in order to determine the efficiency of complexes 1 and 2 as photosensitizers when alone and when combined with the silver nanoflowers. The Pcs show low fluorescence quantum yields and excellent triplet quantum yields of 0.78 (for 1) and 0.66 (for 2) in aqueous media. The triplet quantum yield values increased to 0.80 and 0.89, respectively, in the presence of silver nanoflowers. Long triplet lifetimes ranging from 180 to 200μs in DMSO were obtained for complexes 1, 2 and their conjugates with silver nanoflowers.
ISSN:0277-5387
DOI:10.1016/j.poly.2015.08.017