在BeOCO+和CO2之间具有惊人的高反对称OCO拉伸振动
Xuelin Dong1, Chengxiang Ding2, Qingnan Zhang1
1Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, Shanghai 200438, P. R. China.
Journal of the American Chemical Society
|August 27, 2021
概括
合成和研究了氧化碳离子 (BeOCO+). 它独特的电子结构导致OCO拉伸振动的显著蓝色变化,表明强化了C-O键.
科学领域:
- 无机化学
- 量子化学
- 光谱学
背景情况:
- 对小分子的研究提供了对化学结合的基本见解.
- 二氧化碳 (CO2) 是一种无处不在的分子,具有多种化学反应性.
- (Be) 是一种具有独特电子特性的轻土金属.
研究的目的:
- 合成和表征BEOCO+的阳离子复合物.
- 研究BeOCO+的结构和电子特性.
- 了解结合相互作用及其对振动频率的影响.
主要方法:
- 在固体虹矩阵中生产BeOCO+.
- 红外吸收光谱测量振动频率.
- 量子化学计算 (例如DFT) 来预测结构和电子性质.
主要成果:
- 观察到BeOCO+的反对称OCO拉伸振动在2418.9厘米-1时,与自由CO2相比是71厘米-1的蓝色偏移.
- 量子化学计算准确地重现了实验中的振动频率.
- 电子结构分析显示电荷迁移很小,但有显著的西格玛电荷再分配,加强了终端C-O键.
结论:
- +离子显著改变了二氧化碳的电子结构,导致了加强的C-O键.
- 观察到的蓝色转移归因于西格玛电荷再分配和杂交效应.
- 在BeOCO+中的结合涉及强大的Be+ ← OCO捐赠,受到波函数干扰和电荷偏振的影响.
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