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The unique sandwich K6Be2B6H6 cluster with a real borozene B6H6 core†
Miao Yan,Chang-Qing Miao,Su-Qin Feng,Hua-Jin Zhai
RSC Advances Pub Date : 03/18/2022 00:00:00 , DOI:10.1039/D2RA00692H
Abstract

Theoretical evidence is reported for a boron-based K6Be2B6H6 sandwich cluster, showing a perfectly D6h B6H6 ring, being capped by two tetrahedral K3Be ligands. Due to the comfortable charge transfer, the sandwich is viable in [K3Be]3+[B6H6]6−[BeK3]3+ ionic complex in nature. The [B6H6]6− core with 6π aromaticity vividly imitates the benzene (C6H6), occurring as a real borozene. In contrast, the tetrahedral [K3Be]3+ ligand is 2σ three-dimensional aromatic, acting as the simple superatom. Thus, this complex possesses a collectively three-fold 2σ/6π/2σ aromaticity. The interlaminar interaction is governed by the robust electrostatic attraction. The unique chemical bonding gives rise to interesting dynamic fluxionality.

Graphical abstract: The unique sandwich K6Be2B6H6 cluster with a real borozene B6H6 core
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