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• W2784211458 abstract "The aromatic character of some small planar metallic clusters was revisited with an emphasis on their σ electrons. In contrast to previous reports, our approach based on magnetic ring current as an indicator for aromaticity points out that the σ electron delocalization in molecules behaves as an important contributor to their thermodynamic stability. Ring current maps were constructed using electron densities obtained from density functional theory calculations with the B3LYP functional and the 6-311G(d) basis set. Diatropic currents were further confirmed by an analysis of the symmetry of electronic excitations involved. The triatomic B3+ cycle is found to maintain a double σ and π aromaticity when it forms the [B3(NN)3]+ and [B3(CO)3]+ complexes. The planar pentacoordinated carbon clusters including C@Al5+, C@Al5–xBex1–x, C@Be5Hnn–4, C@Be5Linn–4, and C@Be5HxLi5–x+ are σ aromatic rather than π aromatic as previously assigned. The mixed copper clusters Cu3Si3+ and Cu3Ge3+ are found to be σ aromatic compounds. The copper hydrides CunHn can better be regarded as nonaromatic rather than aromatic compounds. The ring current indicator reveals the σ aromatic feature for Be2@Be5H5+ and Be2@Be6H62+ clusters, whereas this criterion shows a double aromaticity of Be2@B7– and Be2@B8. Overall, the present study points out again the importance of σ electrons in determining the bonding characteristics of metallic clusters, and they should equally be considered as a key element." @default.
• W2784211458 created "2018-01-26" @default.
• W2784211458 creator A5003396849 @default.
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• W2784211458 date "2018-01-25" @default.
• W2784211458 modified "2023-10-17" @default.
• W2784211458 title "Aromaticity of Some Metal Clusters: A Different View from Magnetic Ring Current" @default.
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• W2784211458 doi "https://doi.org/10.1021/acs.jpca.7b11191" @default.
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