Viable aromatic BenHn stars enclosing a planar hypercoordinate boron or late transition metal
Literature Information
Xue-Feng Zhao, Jia-Jia Li, Hai-Ru Li, Caixia Yuan, Xinxin Tian, Si-Dian Li, Yan-Bo Wu, Zhi-Xiang Wang
Monocyclic Bn rings can act as n-electron σ-donors to stabilize a non-classical planar hypercoordinate atom at ring center, forming wheel-like structures. Herein, we report that BenHn rings can also serve as n-electron σ-donors to construct star-like structures including B©Be6H6+ and TM©Be7H7q (TM is a group 10–12 metal with q = −1, 0, and 1, respectively) by complying with octet or 18-electron rules. Electronic structure analyses show that these species are stabilized by the σ-donation and π-backdonation between the central atom and the peripheral BenHn ring, the favorable Coulomb attraction due to the negative–positive–negative charge population pattern on the central atom, the middle Ben layer, and the outer Hn layer, as well as the σ–π double aromaticity. Importantly, three of the ten species, including B©Be6H6+, Cu©Be7H7, and Au©Be7H7, were confirmed to be kinetically stable global minima, thereby providing promising targets for experimental preparations.
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