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Noble gas supported boron-pentagonal clusters B 5 Ng n 3+ : exploring the structures and bonding.
Journal of Molecular Modeling 2018 March 10
A novel type of trivalent BNg five-membered cational species B5 Ngn 3+ (Ng = He~Rn, n = 1~5) has been found and investigated theoretically using the B3LYP and MP2 methods with the def2-QZVPPD and def2-TZVPPD basis sets. The geometry, harmonic vibrational frequencies, bond energies, charge distribution, bond nature, aromaticity, and energy decomposition analysis of these structures were reported. The calculated B-Ng bond energy is quite large (the averaged bond energy is in the range of 209.2~585.76 kJ mol-1 ) for heavy rare gases and increases with the Ng atomic number. The analyses of the molecular wavefunction show that in the BNg compounds of heavy Ng atoms Ar~Rn, the B-Ng bonds are of typical covalent character. Nuclear independent chemical shifts display that both B5 3+ and B5 Ngn 3+ (n=1~5) have obvious aromaticity. Energy decomposition analysis shows that these BNg compounds are mainly stabilized by the σ-donation from the Ng valence p orbital to the B5 3+ LUMO. These findings offer valuable clues toward the design and synthesis of new stable Ng-containing compounds.
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