Abstract
The most stable mono-layer boron sheets were predicted to have both the isolated hexagonal hole and the twin-hexagonal hole. Previous investigations indicate that planar B18H q n (n = 3–6, q = n − 4) are the building blocks of boron sheets with isolated hexagonal holes. Extensive DFT investigations performed in this work show that D 2h B26H8, D 2h B26H8 2+, and C 2 B26H6, may serve as the building blocks of boron sheets with twin-hexagonal holes. These bicyclic clusters possess planar or quasi-planar geometries at B3LYP/6-311+G(d,p) level, with 16, 14, and 14 delocalized π electrons, respectively. Detailed analyses indicate that they are overall aromatic in nature, with the formation of islands of both σ and π aromaticity. They are analogous to D 2h C16H14 and D 2h C16H14 2+ in π bonding patterns, respectively, but fundamentally different from the latter in σ-bonding. Remarkably, all of them appear to be energetically the lowest-lying isomers obtained, which are promising targets for future gas phase syntheses. These hydroboron clusters, together with B18H q n clusters, establish the molecular basis for modeling the short-range structures, nucleation, and growth processes of monolayer boron sheets. The results obtained in this work enrich the chemistry of boron hydride clusters and expand the analogy relationship between hydroborons and hydrocarbons.
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Acknowledgments
This work was jointly supported financially by the NSFC (No. 20873117, 21003086, and 21273140) and SXNSF (No. 2010011012-3). The authors thank Dr. Qiang Chen for helpful discussion.
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Tian, WJ., Bai, H., Lu, HG. et al. Planar D 2h B26H8, D 2h B26H8 2+, and C 2h B26H6: Building Blocks of Stable Boron Sheets with Twin-Hexagonal Holes. J Clust Sci 24, 1127–1137 (2013). https://doi.org/10.1007/s10876-013-0603-2
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DOI: https://doi.org/10.1007/s10876-013-0603-2