Journal
ATOMS
Volume 10, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/atoms10010027
Keywords
planar tetracoordinate carbon; clusters; global minima; DFT computations; chemical bonding analysis; aromaticity
Categories
Funding
- National Agency for Research and Development (ANID) through FONDECYT [1211128]
- National Agency for Research and Development [Program/BECAS DOCTORADO NACIONAL/2020-21201177]
- supercomputing infrastructure of the NLHPC [ECM-02]
- FONDECYT [1211128]
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Recently, a series of global minima with carbon rings decorated with heavier group 14 elements, including planar tetracoordinate carbons, have been reported. These structures are formed by replacing protons with dications in certain anions. Some of these clusters also contain ptC and exhibit 7-t-aromaticity according to chemical bonding analysis and magnetic criteria.
Recently, we reported a series of global minima whose structures consist of carbon rings decorated with heavier group 14 elements. Interestingly, these structures feature planar tetracoordinate carbons (ptCs) and result from the replacement of five or six protons (H+) from the cyclopentadienyl anion (C5H5-) or the pentalene dianion (C8H62-) by three or four E2+ dications (E = Si-Pb), respectively. The silicon derivatives of these series are the Si3C5 and Si4C8 clusters. Here we show that ptC persists in some clusters with an equivalent number of C and Si atoms, i.e., Si5C5, Si8C8, and Si9C9. In all these species, the ptC is embedded in a pentagonal C-5 ring and participates in a three-center, two-electron (3c-2e) Si-ptC-Si sigma-bond. Furthermore, these clusters are 7-t-aromatic species according to chemical bonding analysis and magnetic criteria.
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