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• W2079559903 abstract "The non-classical trigonal bipyramidal carbon (TBPC) arrangement generally exists as transition states (TSs) in nucleophilic bimolecular substitution (SN2) reactions. Nevertheless, chemists have been curious about whether such a carbon bonding could be stable in equilibrium structures for decades. As the TBPC arrangement was normally realized as cationic species theoretically and experimentally, only one anionic example ([At-C(CN)3-At]−) was computationally devised. Herein, we report the design of a new class of anionic TBPC species by using the strategy similar to that for stabilizing the non-classical planar hypercoordinate carbon. When electron deficient Al and Ga were used as the equatorial ligands, eight D3h [A-CE3-A]− (E = Al and Ga, A = Si, Ge, Sn, and Pb) TBPC structures were found to be the energy minima rather than TSs at both the B3LYP and MP2 levels. Remarkably, the energetic results at the CCSD(T) optimization level further identify [Ge-CAl3-Ge]− and [Sn-CGa3-Sn]− even to be the global minima and [Si-CAl3-Si]− and [Ge-CGa3-Ge]− to be the local minima, only slightly higher than their global minima. The electronic structure analyses reveal that the substantial ionic C–E bonding, the peripheral E–A covalent bonding, and the axial mc-2e (multi center-two electrons) bonding play roles in stabilizing these TBPC structures. The structural simplicity and the high thermodynamic stability suggest that some of these species may be generated and captured in the gas phase. Furthermore, as mono-anionic species, their first vertical detachment energies are differentiable from those of their nearest isomers, which would facilitate their characterization via experiments such as the negative ion photoelectron spectroscopy." @default.
• W2079559903 created "2016-06-24" @default.
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• W2079559903 date "2014-03-11" @default.
• W2079559903 modified "2023-09-26" @default.
• W2079559903 title "D3<i>h</i> [A-CE3-A]− (E = Al and Ga, A = Si, Ge, Sn, and Pb): A new class of hexatomic mono-anionic species with trigonal bipyramidal carbon" @default.
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• W2079559903 doi "https://doi.org/10.1063/1.4867364" @default.
• W2079559903 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24628164" @default.
• W2079559903 hasPublicationYear "2014" @default.
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