Artículo
A clean, well-defined solid system for photosensitized 1O 2 production measurements
Fecha de publicación:
12/2006
Editorial:
Royal Society of Chemistry
Revista:
Physical Chemistry Chemical Physics
ISSN:
1463-9076
e-ISSN:
1463-9084
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Generation of singlet molecular oxygen (1O2) by photosensitization with methylene blue (MB) supported in Nafion®-Na films has been quantified by integration of the 1O2 emission decay at 1270 nm. The quantum yield of 1O2 production (ΦΔ) in the air-equilibrated solid phase is 0.24 ± 0.03. Information on the 1O2 generation environment has been gained from complementary techniques such as UV-Vis absorption and emission spectroscopy, as well as MB fluorescence and triplet-triplet absorption decay. Results are compared with the 1O2 generation by MB in methanol solution (ΦΔ = 0.51) and in methanol-swollen Nafion® films (ΦΔ = 0.49 ± 0.06). Differences and similarities are discussed in terms of the factors that influence ΦΔ in solution and in the solid media. The optical and mechanical features of Nafion®, ease of dye loading, compatibility with most solvents, homogeneity, reproducibility and stability of the photosensitizing material makes it a convenient reference for 1O2 generation quantum yield measurements in transparent (micro)heterogeneous and homogeneous media.
Palabras clave:
Oxygen Singlet
,
Photosensitized
,
Solid Reference
,
1o2 Production
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Articulos(IIBBA)
Articulos de INST.DE INVEST.BIOQUIMICAS DE BS.AS(I)
Articulos de INST.DE INVEST.BIOQUIMICAS DE BS.AS(I)
Citación
Wetzler, Diana Elena; García Fresnadillo, David; Orellana, Guillermo; A clean, well-defined solid system for photosensitized 1O 2 production measurements; Royal Society of Chemistry; Physical Chemistry Chemical Physics; 8; 19; 12-2006; 2249-2256
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