THE PRODUCTION OF SINGLET MOLECULAR OXYGEN BY ZINC(II) PHTHALOCYANINE IN ETHANOL AND IN UNILAMELLAR VESICLES. CHEMICAL QUENCHING AND PHOSPHORESCENCE STUDIES

Giuliana Valduga, Santiago Nonell, Elena Reddi, Giulio Jori, Silvia E. Braslavsky

Producción científica: Artículo en revista indizadaArtículorevisión exhaustiva

115 Citas (Scopus)

Resumen

Abstract— Zn(II)phthalocyanine (ZnPc) generates O2(1Δg) with a quantum yield of ca. 0.4 upon photocxcitation at 354 or 600 nm in ethanolic solution as determined by time‐resolved phosphorescence studies at 1270 nm and photooxidation experiments using 1,3‐diphenylisobenzofuran (DPBF) as substrate. The quantum yield of photooxidation slightly increases upon incorporation of ZnPc into unilamellar liposomes of dipalmitoylphosphatidylcholine. Under our irradiation conditions (600 nm, 18°C, and short light exposure times), DPBF(5–50 μM) undergoes photooxidation by a pure Type II mechanism; the rate constant for the O2(1Δg) + DPBF reaction is (1.1 ±0.1) x 109 M‐1 s_1 in ethanol solution and determined to be about two orders of magnitude smaller when both ZnPc and DPBF are embedded into liposomes.

Idioma originalInglés
Páginas (desde-hasta)1-5
Número de páginas5
PublicaciónPhotochemistry and Photobiology
Volumen48
N.º1
DOI
EstadoPublicada - jul 1988
Publicado de forma externa

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