Pulse radiolysis of pyridinecarboxylic acids in aqueous solution |
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| Institution: | 1. Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Saitama, Wako 351-0198, Japan;2. Advanced Center for Computing and Communication, RIKEN, 2-1 Hirosawa, Saitama, Wako 351-0198, Japan;3. Department of Nuclear Engineering and Management, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan;4. Nuclear Science and Engineering Center, Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Ibaraki, Tokai 319-1195, Japan;5. Department of Neurosurgery, Himon׳ya Hospital, 2-9-5 Minami, Meguro, Tokyo 152-0013, Japan;6. Graduate School of Engineering, Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan;7. Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan;1. University of Prishtina, Faculty of Agriculture and Veterinary, Prishtina, Kosovo, Serbia;2. Dipartimento di Sanita pubblica, Patologia comparata e Igiene Veterinaria, Legnaro, Padova, Italy;3. Instituto Zooprofilattico Sperimentale delee Venezie, Legnaro, Padova, Italy;4. Food and Veterianry Agency, Prishtina, Kosovo, Serbia;1. Department of Patho-Functional Bioanalysis, Kyoto University Graduate School of Pharmaceutical Sciences, 46-29, Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan;2. Department of Analytical and Bioinorganic Chemistry, Kyoto Pharmaceutical University, 5 Nakauchi-cho, Misasagi, Yamashina-ku, Kyoto 607-8414, Japan;3. Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, Kyoto University, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan;4. Research & Development Division, Arkray, Inc., Yousuien-nai, 59 Gansuin-cho, Kamigyo-ku, Kyoto 602-0008, Japan |
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| Abstract: | The reactivity of OH, e-aq and H radicals towards aqueous carboxypyridines: picolinic acid (2-pyridinecarboxylic acid), PA; isonicotinic acid (4-pyridinecarboxylic acid), i-NA; 2,6-pyridinedicarboxylic acid, 2,6-PDCA; and 3,5-pyridinedicarboxylic acid, 3,5-PDCA was investigated in the pH-range 1–13.8. The absorption spectra of the OH-adducts, H-adducts and pyridinyl radicals are given as well as the formation and decay kinetics. In acid (but not in alkaline) solution, the reaction of H-atoms leads to the formation of two distinct products, namely H-adduct and pyridinyl radicals. The yields of pyridinyl radical are: 20% for PA, 75% for i-NA, 60% for 2,6-PDCA and 25% for 3,5-PDCA (a yield of 50% has been found earlier for nicotinic acid, NA). |
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