-二复合体具有减弱的N-N键
Keying Ding1, Aaron W Pierpont, William W Brennessel
1Department of Chemistry, University of Rochester, Rochester, New York 14267, USA.
Journal of the American Chemical Society
|June 23, 2009
概括
复合物可以削弱-键,特别是在低协调状态下. 这种pi-backbonding效应是固定研究的关键.
科学领域:
- 无机化学 无机化学 有机化学
- 有机金属化学 有机金属化学
- 固定的方法是固定.
背景情况:
- 据报道,- (N2) 复合物表现出有限的N-N键减弱.
- 实现显著的N-N键减弱对于固定研究至关重要.
研究的目的:
- 使用二基胺联体合成新型-复合物.
- 为了研究低协调数对复合体中N-N键减弱的影响.
- 为了比较与铁的N-N键削弱能力.
主要方法:
- 使用二基胺联体合成具有强制三坐标几何的新型-复合体.
- 合成复合物的光谱和结构分析.
- 计算研究以了解电子相互作用和结合.
主要成果:
- 合成了几种新的三坐标- (CoNNCo) 复合物.
- 与铁相比,形式不等价的复合物显示出较少的N-N键弱化.
- 正式的零价复合物表现出与铁相比的N-N键减弱.
- 鉴定了与N2的pi-backbonding作为N-N债券减弱的机制.
- 发现离子增强了电子密度捐赠到N2.
结论:
- 低协调数,特别是三角形平面几何,足以诱导N-N键的减弱,即使在电负中.
- 在特定的低协调条件下,可以有效地削弱N-N键,这与固定有关.
- 金属中心和辅助的电子特性显著影响N-N键激活.
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