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Title: A comparison between the photophysical and photosensitising properties of tetraphenyl porphycenes and porphyrins
Authors: Rubio, Noemi
Prat, Ferran
Bou, Nuria
Borrell, Jose Ignacio
Teixido, Jordi
Villanueva, Angeles
Juarranz, Angeles
Canete, Magdalena
Stockert, Juan Carlos
Nonell, Snti # ×
Issue Date: 2005
Publisher: CNRS/Gauthier-Villars
Series Title: New Journal of Chemistry vol:29 issue:2 pages:378-384
Abstract: The photophysical properties of 2,7,12,17-tetraphenylporphycene (TPPo) and its palladium(II) (PdTPPo) and copper( II) (CuTPPo) complexes as well as comparisons with those of their porphyrin counterparts are reported. All porphycenes absorb in the red part of the spectrum, but only TPPo shows fluorescence (Phi(F) = 0.15). This compound presents good quantum yields of triplet (Phi(T) = 0.33) and singlet oxygen (Phi(Delta) = 0.23) formation. In the case of PdTPPo, fluorescence is inhibited by the internal heavy-atom effect and the triplet and singlet oxygen quantum yields are enhanced (Phi(T) = Phi(Delta) = 0.78). The presence of the paramagnetic ion Cu(II) in CuTPPo further enhances the non-radiative transitions leading to an internal conversion quantum yield Phi(ic) 0.65 and to a triplet quantum yield Phi(T) = 0.35. With a triplet lifetime of 700 ns, CuTPPo is nevertheless able to sensitise singlet oxygen with a quantum yield that strongly depends on the oxygen concentration in the environment. These photophysical properties, together with their ability to kill several cancer cell lines, place these sensitisers in a good position to be used in photodynamic therapy (PDT).
ISSN: 1144-0546
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Non-KU Leuven Association publications
× corresponding author
# (joint) last author

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