化学
单线态氧
光化学
量子产额
光敏剂
二甲基甲酰胺
溶剂
胶束溶液
水溶液
发光
四氢呋喃
单重态
钌
氧气
荧光
激发态
催化作用
物理化学
有机化学
胶束
物理
光电子学
量子力学
核物理学
作者
Wolfgang Spiller,H. Kliesch,Dieter Wöhrle,Steffen Hackbarth,Beate Röder,Günter Schnurpfeil
标识
DOI:10.1002/(sici)1099-1409(199803/04)2:2<145::aid-jpp60>3.0.co;2-2
摘要
The singlet oxygen luminescence method and the photochemical methods using 1,3-diphenylisobenzofuran ( DPBF ) or bilirubin ditaurate ( BDT ) as chemical quenchers were employed to determine the single oxygen quantum yields (Φ Δ ) of different phthalocyanines and tris(2,2″-bipyridyl)ruthenium(II) dichloride in dimethylformamide ( DMF ) or aqueous micellar solution of 0.1 M CTAC (cetyltrimethylammonium chloride). Additionally, a perylenetetracarboxylic acid diimide derivative was examined in DMF . In a series of tetrasulfonated phthalocyanines ( PTS ) the following order was found: ZnPTS > GaPTS > AlPTS ≈ H 2 PTS > CoPTS . In general, the singlet oxygen quantum yields are higher in DMF than in 0.1 M CTAC/H 2 O . The results obtained with the photochemical systems are comparable with those obtained by the photophysical method. The photochemical DPBF method results in absolute values of Φ Δ . However, in micellar solution, chain reactions occur when DPBF is used as chemical quencher in the photo-oxidative process. This problem can be overcome by adding sodium thiosulphate which is able to destroy the endoperoxide initially formed. BDT can be used as quencher in different solvents to determine Φ Δ relative to a photosensitizer with known singlet oxygen quantum yield in the respective solvent. In comparison to the chemical methods the luminescence method exhibits the advantage that side reactions of the quencher are excluded. But normally the Φ Δ values obtained are relative to a reference, since absolute determinations need much larger efforts.
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