Polymerization of tetracyanoethylene under pressure

Mohammad Khazaei, Masao Arai, Taizo Sasaki, Yoshiyuki Kawazoe

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Based on first-principles calculations, possible phase transformations in the molecular crystals of tetracyanoethyelene (TCNE) were investigated at high pressures. Six new carbon nitride systems with one-, two-, and three-dimensional structures were found. The predicted polymeric and graphitic structures are semiconductors with energy gaps of 0.3-1.7 eV. The predicted three-dimensional solids are also semiconductors with larger energy gaps between 1.8 and 2.2 eV with large bulk moduli >188 GPa. The calculation results suggest two polymerization mechanisms. Furthermore, inspired by the chemical vapor deposition experimentally obtained results, the possibility of folding of the predicted one-dimensional polymeric system into cylindrical molecular structures is considered. Results show that TCNE polymers longer than 18.0 Å can form TCNE-cylinders. Upon hydrogenation of the predicted TCNE-cylinders, they form very stable TCNE-cucurbituril-like structures with energy gaps larger than 2.67 eV.

Original languageEnglish
Pages (from-to)712-720
Number of pages9
JournalJournal of Physical Chemistry C
Volume117
Issue number1
DOIs
Publication statusPublished - 2013 Jan 10

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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    Khazaei, M., Arai, M., Sasaki, T., & Kawazoe, Y. (2013). Polymerization of tetracyanoethylene under pressure. Journal of Physical Chemistry C, 117(1), 712-720. https://doi.org/10.1021/jp310747v