Effect of aza substitution on the photophysical and electrochemical properties of porphycenes: Characterization of the near-IR-absorbing photosensitizers 2,7,12,17-tetrakis(p-substituted phenyl)-3,6,13,16- tetraazaporphycenes

Noemí Rubio, David Sánchez-García, Ana Jiménez-Banzo, Óscar Rey, José I. Borrell, Jordi Teixidó, Santi Nonell

Producción científica: Artículo en revista indizadaArtículorevisión exhaustiva

12 Citas (Web of Science)

Resumen

The need for new photodynamic-therapy photosensitizers has stimulated the search of new families of compounds absorbing strongly in the 700-900 nm range, the region where tissue is most transparent to radiation capable to induce the photodynamic effect. Using computational chemistry techniques, 3,6,13,16-tetraazaporphycenes were previously identified as interesting target candidates. This work reports on the photophysical and electrochemical properties of selected members of this new family of macrocycles. Compared to porphycenes, the tetra-aza counterparts show stronger absorption in the near-infrared, lower-lying singlet and triplet excited states, and substantially larger internal conversion quantum yield (ΦIC = 0.93). Energy transfer to oxygen is observed, which results in the formation of the cytotoxic species singlet oxygen. The process is found to be reversible, consistent with a triplet-energy value close to that of singlet oxygen.

Idioma originalInglés
Páginas (desde-hasta)3480-3487
Número de páginas8
PublicaciónJournal of Physical Chemistry A
Volumen110
N.º10
DOI
EstadoPublicada - 16 mar 2006

Huella

Profundice en los temas de investigación de 'Effect of aza substitution on the photophysical and electrochemical properties of porphycenes: Characterization of the near-IR-absorbing photosensitizers 2,7,12,17-tetrakis(p-substituted phenyl)-3,6,13,16- tetraazaporphycenes'. En conjunto forman una huella única.

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