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A large kinetic isotope effect in the reaction of ascorbic acid with 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide (PTIO˙) in aqueous buffer solutions
- Title
- A large kinetic isotope effect in the reaction of ascorbic acid with 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide (PTIO˙) in aqueous buffer solutions
- Authors
- Nakanishi I.; Shoji Y.; Ohkubo K.; Ozawa T.; Matsumoto K.-I.; Fukuzumi S.
- Ewha Authors
- Shunichi Fukuzumi
- SCOPUS Author ID
- Shunichi Fukuzumi
- Issue Date
- 2020
- Journal Title
- Chemical Communications
- ISSN
- 1359-7345
- Citation
- Chemical Communications vol. 56, no. 77, pp. 11505 - 11507
- Publisher
- Royal Society of Chemistry
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- A large kinetic isotope effect (KIE,kH/kD) of 12.8 was observed for the hydrogen-transfer reaction from ascorbic acid to 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide (PTIO˙) in a phosphate buffer solution (0.05 M, pH/pD 7.0) at 298 K. The isotopic difference in the activation energies (6.8 kJ mol−1) determined from the temperature dependence of the KIE suggests that quantum mechanical tunneling may partly play a role in the reaction, although the isotopic ratio of the Arrhenius prefactor (AH/AD= 0.86) is within the semiclassical limits. © The Royal Society of Chemistry 2020.
- DOI
- 10.1039/d0cc05214k
- Appears in Collections:
- 자연과학대학 > 화학·나노과학전공 > Journal papers
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