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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Spontaneous Symmetry Breaking in Cyclo[18]Carbon

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Pereira, Zenner S. [1] ; da Silva, Edison Z. [2]
Total Authors: 2
[1] Univ Fed Rural Semiarido UFERSA, Dept Ciencia & Tecnol, BR-59780000 Caraubas, RN - Brazil
[2] Univ Estadual Campinas, Inst Phys Gleb Wataghin, CP 6165, BR-13083985 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Journal of Physical Chemistry A; v. 124, n. 6, SI, p. 1152-1157, FEB 13 2020.
Web of Science Citations: 0

After the experimental evidence of polyynic as the stable form of cyclo{[}18]carbon, in the present paper, using ab initio electronic structure calculations, we show that this result is a symmetry breaking event, a consequence of the second-order Jahn-Teller effect. We show that the eigenfunctions associated with lowest unoccupied molecular orbitals (LUMO) and LUMO + 1, the excited states of this ring molecule, interact with the eigenfunctions associated with the ground state (occupied states), and this interaction stabilizes the less symmetric polyynic form of cyclo{[}18] carbon with D-9h symmetry, instead of the cumulenic form. The frontier state interactions are responsible for the distortions in the symmetry in the electronic structures, lowering the energy and making the polyynic form the stable one with alternating triple and single bonds. (AU)

FAPESP's process: 16/23891-6 - Computer modeling of condensed matter
Grantee:Alex Antonelli
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC