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Area of Science:

  • Computational chemistry
  • Organic synthesis
  • Materials science

Background:

  • Polyhedranes exhibit unique geometrical and electronic properties.
  • Alkynyl unit insertion into polyhedranes is a novel approach to modify their characteristics.

Purpose of the Study:

  • To propose and investigate novel carbo-cage structures in silico.
  • To analyze the structural strain, magnetic properties, and kinetic stability of these carbo-cages.

Main Methods:

  • Density functional theory (DFT) computations were employed.
  • Born-Oppenheimer molecular dynamics (MD) simulations were performed at elevated temperatures (900 K and 2400 K).

Main Results:

  • Alkynyl insertion significantly reduces structural strain in polyhedranes.
  • Magnetic field delocalization indicates aromaticity in smaller rings and nonaromaticity in larger rings.
  • Carbo-cage counterparts retain the aromatic/nonaromatic character of parent compounds.
  • Carbo-cages exhibit high kinetic stability, with carbo-prismane remaining stable up to 2400 K.

Conclusions:

  • Carbo-cages represent a promising class of novel carbon allotropes.
  • Despite higher enthalpies of formation, their kinetic stability supports potential experimental synthesis.
  • The findings encourage further exploration and potential isolation of these carbo-cage systems.