在 trans-HOON 中异常长的 O-O 债券:一个典范性的负荷转移债券
Huaiyu Zhang1, Jia Wei1, Rui Ma1
1Institute of Computational Quantum Chemistry, and Hebei Key Laboratory of Inorganic Nano-materials, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050024, China.
这项研究表明,酸 (HONO) 异构体HOON中不寻常的O-O键是由电荷转移键合机制引起的. 相比之下,它的硫类同类HOSN由于不同的电子相互作用而表现出正常的OS键.
科学领域:
- 化学结合理论 化学结合理论
- 大气化学 大气化学
- 燃烧化学 燃烧化学是什么
背景情况:
- 酸 (HONO) 在大气和燃烧过程中至关重要.
- 同位体HOON,其弱的O-O键,比HONO更少被理解.
- 硫类型的HOSN显示了一个典型的OS键.
研究的目的:
- 使用ab initio价值键 (VB) 理论,研究跨-HOXN (X = O,S) 的结合性质.
- 解释HOON中的O-O债券和HOSN中的O-S债券的不同特征.
- 阐明控制这些分子稳定性和几何的电子因素.
主要方法:
- 在初始价值键 (VB) 理论的应用.
- 在跨-HOON和跨-HOSN的电子结构和粘合的分析.
- 与相关分子比较,例如H2O2.2.
主要成果:
- 跨-HOON 呈现出三中心四电子电荷转移键,ON 部分类似于氧化和烯.
- 从单一对到O-O抗键轨道的增强过度结合显著削弱并延长了O-O键.
- 跨HOSN的特征是作为一个双中心的双电子电荷转移键.
- 两种跨-HOXN异构体都喜欢平面几何形状,不同于H2O2.2.的形几何形状.
- 几何放松稳定了跨-HOON,而结合和超结合稳定了跨-HOSN.
结论:
- 在HOON中独特的结合归因于电荷转移相互作用和过度结合,导致弱的O-O结合.
- HOSN的结合更简单,以标准的电荷转移机制为特征.
- 了解这些结合细微差别是预测这些大气物种的反应性和特性的关键.
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