在Au(111) 表面的Cl结合的性质:证据表明主要是共价相互作用
Thomas A Baker1, Cynthia M Friend, Efthimios Kaxiras
1Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA.
Journal of the American Chemical Society
|March 5, 2008
概括
这项研究表明,与黄金表面的结合主要是共价的,这挑战了对离子素金属相互作用的传统观点. 证据显示电荷转移和轨道混合,而不是简单的离子形成.
科学领域:
- 表面科学是一门学科.
- 计算化学计算化学
- 材料科学 材料科学 材料科学
背景情况:
- 素和金属表面之间的相互作用通常被认为是离子的.
- 了解这种结合对于催化和材料设计至关重要.
研究的目的:
- 为了研究在Au111表面上吸附的电子性质.
- 挑战目前普遍认为的离子素金属结合的假设.
主要方法:
- 第一个原则密度函数理论 (DFT) 计算.
- 分析电荷密度转移和电子状态混合.
主要成果:
- 证据表明,主要是Cl和Au之间的共价键.
- 观察到的电荷密度转移到原子间区域,而不是对称的Cl-离子形成.
- 在Au dz2轨道中的方向性和电子状态混合表明共价性质.
结论:
- 与Au(111) 的结合主要是共价的.
- 这一发现需要重新评估素金属表面相互作用.
- 理论见解为表面化学提供了新的视角.
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