Boron clusters quasiplanarity

Previous theoretical investigations of pure boron clusters, based on ab initio quantum chemical and density functional theoretical methods, have shown that pure boron has stable structures forming a new class of boron materials. These structures can be classified into four topological groups convex, spherical, quasiplanar and tubular clusters. The new forms contain basically two units a pentagonal and an hexagonal pyramid. All these clusters can easily be generated by both units with the help of an Aufbau Principle proposed for boron. ... 

Theoretical confirmations The first theoretical confirmation for the quasiplanarity of boron clusters followed two years later by an ab initio quantum chemical study by Ricca et They investigated small boron clusters B for = 2 to 14 and substantiated that clusters for 10< < 14 tend to possess quasi-planar structures. In the following ten years a series of theoretical... 

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