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Updated: Dec 8, 2025

Negative Additive Manufacturing of Complex Shaped Boron Carbides
Published on: September 18, 2018
Boron-based ternary Rb6Be2B6 cluster featuring unique sandwich geometry and a naked hexagonal boron ring
Ying-Jin Wang1, Lin-Yan Feng2, Li Xu3
1Department of Chemistry, Xinzhou Teachers University, Xinzhou 034000, Shanxi, China and Nanocluster Laboratory, Institute of Molecular Science, Shanxi University, Taiyuan 030006, China. yingjinwang@sxu.edu.cn hj.zhai@sxu.edu.cn.
Abstract:
Computational evidence is reported on a boron-based ternary Rb6Be2B6 cluster as the "Big Mac" sandwich on a subnanoscale with thickness of 0.58 nm. The core hexagonal B6 ring, occurring in the naked form due to double 6π/6σ aromaticity, is capped by two tetrahedral BeRb3 ligands. Such a B6 motif is scarce in boron clusters. The sandwich cluster has four-fold 2σ/6π/6σ/2σ aromaticity and its tetrahedral BeRb3 ligand is the simplest case of three-dimensional aromaticity (or spherical aromaticity). The sandwich can be formulated as a charge-transfer complex, [Rb3Be]3+[B6]6-[BeRb3]3+, whose components are held together by robust electrostatics, facilitating dual-mode dynamic fluxionality.
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