Hydrogenation of B120/−: A Planar-to-Icosahedral Structural Transition in B12Hn0/− (n = 1–6) Boron Hydride Clusters
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A systematic density functional theory and wave function theory investigation performed in this work reveals a planar-to-icosahedral structural transition between n = 4–5 in the partially hydrogenated B12Hn0/− clusters (n = 1–6) upon hydrogenation of all-boron B120/−. Coupled cluster calculations with triple excitations (CCSD(T)) indicate that a distorted icosahedral B12H6 cluster with C2 symmetry is overwhelmingly favored (by 35 kcal/mol) over the recently proposed perfectly planar borozene (D3h B12H6) (Szwacki et al., Nanoscale Res Lett 4:1085, 2009) which proves to be a high-lying local minimum. A similar 2D–3D structural transition occurs to the corresponding boron boronyl analogues of B12(BO)n with n –BO terminals. Detailed adaptive natural density partitioning (AdNDP) analyses reveal the bonding patterns of these quasi-planar or cage-like clusters which are characterized with delocalized σ and π molecular orbitals. The electron detachment energies of the concerned anions and excitation energies of the neutrals are also predicted to facilitate their future experimental characterizations.
KeywordsBoron Boron hydrides Density functional theory Structures Adaptive natural density partitioning
This work was jointly supported by the National Science Foundation of China (No. 20873117) and Shanxi Natural Science Foundation (No. 2010011012-3). The authors are grateful to Professor A. I. Boldyrev and Dr. T. Galeev and A. Sergeeva at Utah State University for their generous help in using the AdNDP program.
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