Structure and Bonding in CE5− (E=Al–Tl) Clusters: Planar Tetracoordinate Carbon versus Pentacoordinate Carbon
Chemistry–An Asian Journal, 2018•Wiley Online Library
The structure, bonding, and stability of clusters with the empirical formula CE5−(E= Al–Tl)
have been analyzed by means of high‐level computations. The results indicate that,
whereas aluminum and gallium clusters have C2v structures with a planar tetracoordinate
carbon (ptC), their heavier homologues prefer three‐dimensional C4v forms with a
pentacoordinate carbon center over the ptC one. The reason for such a preference is a
delicate balance between the interaction energy of the fifth E atom with CE4 and the …
have been analyzed by means of high‐level computations. The results indicate that,
whereas aluminum and gallium clusters have C2v structures with a planar tetracoordinate
carbon (ptC), their heavier homologues prefer three‐dimensional C4v forms with a
pentacoordinate carbon center over the ptC one. The reason for such a preference is a
delicate balance between the interaction energy of the fifth E atom with CE4 and the …
Abstract
The structure, bonding, and stability of clusters with the empirical formula CE5− (E=Al–Tl) have been analyzed by means of high‐level computations. The results indicate that, whereas aluminum and gallium clusters have C2v structures with a planar tetracoordinate carbon (ptC), their heavier homologues prefer three‐dimensional C4v forms with a pentacoordinate carbon center over the ptC one. The reason for such a preference is a delicate balance between the interaction energy of the fifth E atom with CE4 and the distortion energy. Moreover, bonding analysis shows that the ptC systems can be better described as CE4−, with 17‐valence electrons interacting with E. The ptC core in these systems exhibits double aromatic (both σ and π) behavior, but the σ contribution is dominating.
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