Many M©Bn boron wheels are local, but not global minima

Literature Information

Publication Date 2012-08-20
DOI 10.1039/C2CP41521F
Impact Factor 3.676
Authors

Yunlong Liao, Clara Leticia Cruz, Paul von Ragué Schleyer, Zhongfang Chen


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Abstract

Twenty-six planar boron wheels with a central hypercoordinate atom (M©Bn, M is a 2nd or 3rd period element) were designed following the Schleyer–Boldyrev concept of geometric and electronic fit whereby in-plane σ- as well as π-aromaticity contribute to the chemical bonding. Global minimum searches using an efficient newly implemented method reveal that most of these boron wheels are only local, rather than global minima. However, the Be©B8 triplet planar wheel global minimum is a new member of the planar hypercoordinate M©Bn family. Six categories classify the structures of the other global minima: planar wheels, planar non-wheel forms, quasi-two-center-wheels, as well as leaf-like, pyramid-like, and umbrella-like geometries.

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Physical Chemistry Chemical Physics
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