Li6E5Li6: Tetrel Sandwich Complexes with 10-π-Electrons

Diego Inostroza, Luis Leyva-Parra, Ricardo Pino-Rios, José Solar-Encinas, Alejandro Vásquez-Espinal, Sudip Pan, Gabriel Merino, Osvaldo Yañez, William Tiznado

Research output: Contribution to journalArticlepeer-review


When (4n +2) π-electrons are located in single planar ring, it conventionally qualifies as aromatic. According Hückel's rule, systems possessing ten π-electrons should be aromatic. Herein we report a series of D5h Li6E5Li6 sandwich structures, representing the first global minima featuring ten π-electrons E510− ring (E=Si−Pb). However, these π-electrons localize as five π-lone-pairs rather than delocalized orbitals. The high symmetry structure achieved is a direct consequence of σ-aromaticity, particularly favored in elements from Si to Pb, resulting in a pronounced diatropic ring current flow that contributes to the enhanced stability of these systems.

Original languageEnglish
Article numbere202317848
JournalAngewandte Chemie - International Edition
Issue number5
Publication statusPublished - 25 Jan 2024


  • Aromaticity
  • Bonding
  • Global Minimum
  • Sandwich
  • Stability
  • Ten π-Electrons
  • Tetrel Chemistry

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry


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