Photophysics of tetracarboxy-zinc phthalocyanine photosensitizers

Zinc-tetracarboxy-phthalocyanine (ZnPc(COOH) 4 ) was synthesized by a melting method and basic hydrolysis. A ZnPc(COOH) 4 /Fe 3 O 4 /Ch composite was prepared by immobilization of ZnPc(COOH) 4 onto Fe 3 O 4 /chitosan nanoparticles by a simple immersion method. The photophysical properties were studi...

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Bibliographic Details
Published in:RSC advances 2022-11, Vol.12 (49), p.31778-31785
Main Authors: Potlog, Tamara, Popusoi, Ana, Lungu, Ion, Robu, Stefan, Bulimestru, Ion
Format: Article
Language:English
Subjects:
Aqueous solutions
Aromatic compounds
Chemistry
Chitosan
Conjugation
Iron oxides
Nanoparticles
Spectrophotometry
Time correlation functions
Zinc
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Summary:Zinc-tetracarboxy-phthalocyanine (ZnPc(COOH) 4 ) was synthesized by a melting method and basic hydrolysis. A ZnPc(COOH) 4 /Fe 3 O 4 /Ch composite was prepared by immobilization of ZnPc(COOH) 4 onto Fe 3 O 4 /chitosan nanoparticles by a simple immersion method. The photophysical properties were studied using UV-vis spectrophotometry, fluorescence spectroscopy and time-correlated single photon counting (TCSPC) in different aqueous solutions. The UV-vis spectra of the ZnPc(COOH) 4 /Fe 3 O 4 /Ch composite displays absorption by the aromatic rings, with a Q band exhibited at λ max = 702 nm. Moreover, the ZnPc(COOH) 4 /Fe 3 O 4 /Ch composite exhibits long triplet-state lifetimes of 1.6 μs and 12.3 μs, crucial for application as a photosensitizer. A triplet quantum yield of 0.56 for the ZnPc(COOH) 4 /Fe 3 O 4 /Ch composite in DMSO/H 2 O was achieved. FTIR showed that the conjugation of ZnPc(COOH) 4 with Fe 3 O 4 /chitosan nanoparticles was achieved by electrostatic interaction. A ZnPc(COOH) 4 /Fe 3 O 4 /Ch photosensitizer was synthesized by immobilization of ZnPc(COOH) 4 onto Fe 3 O 4 /chitosan nanoparticles by a simple immersion method.
ISSN:2046-2069
2046-2069
DOI:10.1039/d2ra05676c