Laser photolysis studies of the carbon–sulfur bond cleavage induced in the triplet exciplex of benzylnaphthyl sulfide and aromatic ketones

文献信息

发布日期 2001-07-11
DOI 10.1039/B103026B
影响因子 3.676
作者

Minoru Yamaji, Shin-ichi Ueda, Haruo Shizuka, Seiji Tobita


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摘要

The photoinduced dissociation of the carbon–sulfur bond in benzyl-α-naphthyl sulfide (BNS) in acetonitrile has been studied by laser flash photolysis. Upon direct photoexcitation of BNS, C–S bond fission occurs in the excited singlet state, resulting in the formation of the α-naphthylthiyl and benzyl radicals with a quantum yield of 0.22. Triplet sensitization of BNS by xanthone and benzophenone causes the simultaneous formation of the lowest triplet state (T1) of BNS and the radicals. The efficiencies of the formations of the T1 state and the radicals are 0.53 and 0.41, respectively. When triplet BNS decays, further formation of the radicals is observed with an efficiency of 0.95. The decay rate of triplet BNS is enhanced non-linearly with increasing concentration of the ketone. The second cleavage can be interpreted by considering the formation of the triplet exciplex which consists of triplet BNS and ketone. The mechanism of the efficient C–S bond dissociation ia the triplet exciplex is discussed.

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来源期刊

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
自引率: 10.3%
年发文量: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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