Chen Wei-Jia, Chen Teng-Teng, Chen Qiang, Lu Hai-Gang, Zhao Xiao-Yun, Ma Yuan-Yuan, Yan Qiao-Qiao, Yuan Rui-Nan, Li Si-Dian, Wang Lai-Sheng
Department of Chemistry, Brown University, Providence, RI, 02912, USA.
Nanocluster Laboratory, Institute of Molecular Science, Shanxi University, 030006, Taiyuan, China.
Commun Chem. 2022 Mar 3;5(1):25. doi: 10.1038/s42004-022-00643-1.
Despite its electron deficiency, boron can form multiple bonds with a variety of elements. However, multiple bonds between boron and main-group metal elements are relatively rare. Here we report the observation of boron-lead multiple bonds in PbBO and PbBO, which are produced and characterized in a cluster beam. PbBO is found to have an open-shell linear structure, in which the bond order of B☱Pb is 2.5, while the closed-shell [Pb≡B-B≡O] contains a B≡Pb triple bond. PbBO is shown to have a Y-shaped structure with a terminal B = Pb double bond coordinated by two boronyl ligands. Comparison between [Pb≡B-B≡O]/[Pb=B(B≡O)] and the isoelectronic [Pb≡B-C≡O]/[Pb=B(C≡O)] carbonyl counterparts further reveals transition-metal-like behaviors for the central B atoms. Additional theoretical studies show that Ge and Sn can form similar boron species as Pb, suggesting the possibilities to synthesize new compounds containing multiple boron bonds with heavy group-14 elements.
尽管硼缺乏电子，但它能与多种元素形成多重键。然而，硼与主族金属元素之间的多重键相对较少。在此，我们报告了在团簇束中产生并表征的PbBO和PbBO中硼-铅多重键的观测结果。发现PbBO具有开壳层线性结构，其中B☱Pb的键级为2.5，而闭壳层的[Pb≡B-B≡O]包含一个B≡Pb三键。PbBO显示出Y形结构，带有由两个硼酰基配体配位的末端B = Pb双键。[Pb≡B-B≡O]/[Pb=B(B≡O)]与等电子的[Pb≡B-C≡O]/[Pb=B(C≡O)]羰基对应物之间的比较进一步揭示了中心B原子类似过渡金属的行为。额外的理论研究表明，锗和锡可以形成与铅类似的硼物种，这表明有可能合成含有与重14族元素的多重硼键的新化合物。
