Abstract
Based upon extensive density functional theory and wave function theory calculations performed in this work, we predict the existence of the perfectly planar triangle C3h B6H +3 (1, 1A′) and the double-chain stripe C2h B8H2 (9, 1Ag) which are the ground states of the systems and the inorganic analogues of cyclopropene cation D3h C3H +3 and cyclobutadiene D2h C4H4, respectively. Detailed adaptive natural density partitioning (AdNDP) analyses indicate that C3h B6H +3 is π plus σ doubly aromatic with two delocalized π-electrons and six delocalized σ-electrons formally conforming to the 4n + 2 aromatic rule, while C2h B8H2 is π antiaromatic and σ aromatic with four delocalized π-electrons and ten delocalized σ-electrons. The perfectly planar C2h B8H4 (5, 1Ag) also proves to be π antiaromatic analogous to D2h C4H4, but it appears to be a local minimum about 50 kJ mol-1 less stable than the three dimensional Cs B8H4 (6, 1A′). AdNDP, nucleus independent chemical shifts (NICS) and electron localization function (ELF) analyses indicate that these boron hydride clusters form islands of both σ- and π-aromaticities and are overall aromatic in nature in ELF aromatic criteria.
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Li, DZ., Lu, HG. & Li, SD. Planar π-aromatic C3h B6H +3 and π-antiaromatic C2h B8H2: boron hydride analogues of D3h C3H +3 and D2h C4H4 . J Mol Model 18, 3161–3167 (2012). https://doi.org/10.1007/s00894-011-1322-y
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DOI: https://doi.org/10.1007/s00894-011-1322-y