Jemmis Eluvathingal D, Pathak Biswarup, King R Bruce, Schaefer Henry F
School of Chemistry, University of Hyderabad, Hyderabad 500 046, India.
Chem Commun (Camb). 2006 May 28(20):2164-6. doi: 10.1039/b602116f. Epub 2006 Apr 18.
Analysis of model compounds such as Fe2(CO)6, C2 and HBBH shows that pi-bonds left to themselves are shorter than sigma-bonds; in many ways sigma-bonds prevent pi-bonds from adopting their optimal shorter distances.
对诸如Fe2(CO)6、C2和HBBH等模型化合物的分析表明，孤立存在的π键比σ键短；在许多方面，σ键阻止π键采用其最佳的较短距离。
