Abstract
Abstract. The interactions between triplet state benzophenone and halide anion species (Cl
Highlights
Oceans cover about 70% of the Earth’s surface and provide a surface where exchange of gases and energy take place through complex mechanisms
In the present paper we have demonstrated that photosensitized reactions can occur due to the presence of photochemical agents in the sea surface microlayer
Proposed mechanism, chemistry may be initiated by interactions between triplet state benzophenone and halide anions
Summary
Oceans cover about 70% of the Earth’s surface and provide a surface where exchange of gases and energy take place through complex mechanisms. Numerous studies on aromatic ketones on photoinduced charge transfer or/and energy transfer (Benitez et al, 1997; Haag et al, 1984; Huang and Shu, 1995; Poznyak and Vivero, 2005; Wu and Masten, 2002) In this case, following light absorption, benzophenone is capable of generating reactive oxidant species, such as singlet oxygen O2(1 g) (Mehrdad et al, 2002a b), ketyl radical and others, which can oxidize a wide range of organic compounds (Blanchi and Watkins, 1974; Encinas et al, 1985; Encinas and Scaiano, 1981; Grewer and Brauer, 1994; Haselbach et al, 1991; Jacques et al, 1997; Kajii et al, 1987). By applying laser flash photolysis, we aim to investigate the interactions between benzophenone (again a possible proxy for the aromatics in the oceanic surface layer) and halide anions by determining bimolecular rate constants for the quenching of excited benzophenone (BP*) by halide anions and their mixtures
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