Understanding electronic structures, chemical bonding, and fluxional behavior of Lu2@C2n (2n = 76–88) by a theoretical study

Endohedral metal–metal-bonding fullerenes, in which encapsulated metals form covalent metal–metal bonds inside, are an emerging class of endohedral metallofullerenes. Herein, we reported quantum-chemical studies on the electronic structures, chemical bonding, and dynamic fluxionality behavior of end...

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Bibliographic Details
Published in:The Journal of chemical physics 2022-11, Vol.157 (18), p.184306-184306
Main Authors: Shui, Yuan, Pei, Gerui, Zhao, Pei, Xiong, Mo, Li, Sidian, Ehara, Masahiro, Yang, Tao
Format: Article
Language:English
Subjects:
Cages
Chemical bonds
Covalence
Covalent bonds
Decomposition
Dimers
Encapsulation
Fullerenes
Metallofullerenes
Molecular orbitals
Quantum chemistry
Quantum theory
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Summary:Endohedral metal–metal-bonding fullerenes, in which encapsulated metals form covalent metal–metal bonds inside, are an emerging class of endohedral metallofullerenes. Herein, we reported quantum-chemical studies on the electronic structures, chemical bonding, and dynamic fluxionality behavior of endohedral metal–metal-bonding fullerenes Lu2@C2n (2n = 76–88). Multiple bonding analysis approaches, including molecular orbital analysis, the natural bond orbital analysis, electron localization function, adaptive natural density partitioning analysis, and quantum theory of atoms in molecules, have unambiguously revealed one two-center two-electron σ covalent bond between two Lu ions in fullerenes. Energy decomposition analysis with the natural orbitals for chemical valence method on the bonding nature between the encapsulated metal dimer and the fullerene cage suggested the existence of two covalent bonds between the metal dimer and fullerenes, giving rise to a covalent bonding nature between the metal dimer and fullerene cage and a formal charge model of [Lu2]2+@[C2n]2−. For Lu2@C76, the dynamic fluxionality behavior of the metal dimer Lu2 inside fullerene C76 has been revealed via locating the transition state with an energy barrier of 5 kcal/mol. Further energy decomposition analysis calculations indicate that the energy barrier is controlled by a series of terms, including the geometric deformation energy, electrostatic interaction, and orbital interactions.
ISSN:0021-9606
1089-7690
DOI:10.1063/5.0100652