期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 117, 期 49, 页码 13101-13104出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp409111m
关键词
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资金
- Air Force Office of Scientific Research
- National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1342940] Funding Source: National Science Foundation
A photoacid that possesses a metastable acidic state induced by visible light is studied. Previous work showed that this photoacid can reversibly produce a large pH change capable of controlling chemical reactions, altering material properties, and killing bacteria. In this work, we studied the relaxation kinetics of the metastable acidic state in different solvents including water, ethanol, and DMSO. In all of these solvents, the kinetic data can be fitted well to a second-order rate equation, which indicates that protonation is involved in the rate-limiting step. The rate constants in water, ethanol, and DMSO are 73, 1.6, and 0.034 M-1 s(-1), respectively. The slow relaxation in DMSO allowed us to fully characterize the structure of the metastable acidic state using proton NMR. We also measured the quantum yield of the photoreaction, which is as high as 0.37.
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