使用扭曲和异二氧化物对的二氧化/氧化物互换
Wataru Suzuki1, Hiroaki Kotani1, Tomoya Ishizuka1
1Department of Chemistry, Faculty of Pure and Applied Sciences , University of Tsukuba and CREST (JST) , 1-1-1 Tennoudai , Tsukuba , Ibaraki 305-8571 , Japan.
Journal of the American Chemical Society
|March 19, 2019
概括
研究人员使用新型二甲基化氨酸实现了二氧化 (O2) 和过氧化 (H2 O2) 之间的首次可逆转换. 这一突破使得高效的O2/H2O2互转成为可能,这对能源应用至关重要.
科学领域:
- 超分子化学
- 催化剂
- 能量储存
背景情况:
- 过氧化 (H2O2) 作为一种能源越来越重要.
- 在二氧化物 (O2) 和H2之间进行有效的相互转换是非常理想的.
- 之前的研究集中在O2转换为H2O2,缺乏可逆系统.
研究的目的:
- 实现第一个可逆的O2/H2O2相互转换.
- 研究氨酸结构在控制可逆性的作用.
- 了解可逆O2/H2O2转换的机制.
主要方法:
- 合成N21,N23二甲基化形和其减少形式 (异).
- 通过交替气体泡 (Ar/O) 进行O2/H2互转的重复循环.
- 动力学和热力学分析使用H NMR,紫外线光谱和DFT计算.
主要成果:
- 使用二甲基化氨酸系统成功证明可逆的O2/H2互转.
- 结构同位素 (N21,N22二甲基) 显示没有可逆转换,突显了甲基组定位的重要性.
- 通过N-甲基化实现了最小的吉布斯自由能量差异和激活能量,从而实现了高效的相互转换.
结论:
- 通过N21,N23二甲基化系统,可以实现前所未有的可逆O2/H2转化.
- 内N-H质子方向和单双方向对于键形成和反应可逆性至关重要.
- 作为一个关键的中间体,建议在和H2之间的两点结 adduct.
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