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Experiments revealed that small boron cluster anions and cations are (quasi-)planar. For neutral boron cluster, (quasi-)planar motifs are also suggested to be global minimum by many theoretical studies, and a structural transformation from quasi-planar to double-ring tubular structures occurs at B 20 . However, a missing opportunity is found for neutral B 14 , which is a flat cage and more stable than the previous quasi-planar one by high level ab initio calculations. The B 14 cage has a largedoi:10.1063/1.3692183 pmid:22423832 fatcat:kvuy3o346zgvxifine6mirvctu