New Development of Quantum Tunneling Reaction at Ultralow Temperature

超低温量子隧道反应新进展

• 批准号: 06453021
• 负责人: MIYAZAKI Tetsuo
• 金额: $ 4.61万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06453021/
• 关键词: Tunneling effect; Tunneling reaction; Hydrogen molecule anions; Solid hydrogen; Vitamin C; 極低温; 水素原子; 化学反応速度論; 量子効果

The isotope effect on hydrogen molecule elimination reaction from 2,3-dime-thylbutane cations (h-DMB^+) and 2,3-dimethylbutane-2,3-d_2 cations (d-DMB^+) has been studied at 77 K.The significant isotope effect (k(h-DMB^+)/k(d-DMB^+)=1.7*10^4) on the reaction was explained in terms of a model of the tunneling elimination of a hydrogen molecule from a DMB^+ ion.A large isotope effect (*20-50) on the reaction between long-lived radicals that are related to DNA mutation and h-vitamin C (or d-vitamin C) has been observed in concentrated protein solution that is a model of cells. The large isotope effect indicates the importance of a tunneling reaction in a biological system.H_2^- anions has been observed clearly for the first time by use of a high-resolution-ESR spectroscopy in solid hydrogen at 2.4K.The H_2^- anions decay at 4.2 K by tunneling.

研究了 77 K 下同位素对 2,3-二甲基丁烷阳离子 (h-DMB^+) 和 2,3-二甲基丁烷-2,3-d_2 阳离子 (d-DMB^+) 氢分子消除反应的影响.用模型解释了同位素对反应的显着影响（k(h-DMB^+)/k(d-DMB^+)=1.7*10^4）从 DMB^+ 离子中隧道消除氢分子。与 DNA 突变相关的长寿命自由基和 h-维生素 C（或 d-维生素 C）之间的反应具有大同位素效应 (*20-50) ）已在作为细胞模型的浓缩蛋白质溶液中观察到。大同位素效应表明了隧道反应在生物系统中的重要性。利用高分辨率ESR光谱技术首次在2.4K固体氢中清楚地观察到H_2^-阴离子。H_2^-阴离子通过隧道效应在 4.2 K 处衰减。

项目成果

T.Miyazaki: "ESR Studies of a New Reactive Species Produced in gamma-Ray Irradiated Solid para-H_2 at 4.2 K" Chem.Phys.Letters.232. 229-231 (1995)

T.Miyazaki：“在 4.2 K 下伽马射线照射固体 para-H_2 中产生的新反应物质的 ESR 研究”Chem.Phys.Letters.232。

T.Miyazaki: "A Lorge isotope effect on formation of tetramethylethylene cations in γ-irradiated 2,3-dimethylbutane at 77K." J.Phys.Chem.98. 10767-10770 (1994)

T.Miyazaki：“Lorge 同位素对 77K γ 辐照的 2,3-二甲基丁烷中四甲基乙烯阳离子形成的影响。”J.Phys.Chem.98 (1994)。

T.Miyazaki: "Rate Constant for Reaction of Vitamin C with Protein Radicals in Irradiated Aqueous Albumin Solution at 295K" Radiat.Phys.Chem.45. 199-202 (1995)

T.Miyazaki：“295K 辐照白蛋白水溶液中维生素 C 与蛋白质自由基反应的速率常数”Radiat.Phys.Chem.45。

T.Miyazaki: "Reaction of Metallothionein and Long-Iived Raicals in murine Liver." Radiat.Phys.Chem.(in press). (1996)

T.Miyazaki：“金属硫蛋白和长寿Raicals在小鼠肝脏中的反应。”

T.Miyazaki: "ESR Studies of a New Reactive Species Produced in γ-Ray Irradiated Solid para-H_2 at 4.2K" Chem.Phys.Letters. 232. 229-231 (1995)

T.Miyazaki：“4.2K γ 射线照射固体 para-H_2 中产生的新反应物质的 ESR 研究”Chem.Phys.Letters 232. 229-231 (1995)