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Stabilizing the EN triple bonds in pnictogen mononitrides.

Aswin Chandran1, Simon Edin1, Mattias Tan1

  • 1Department of Chemistry, Centre for Analysis and Synthesis, Lund University, Naturvetarvägen 22, 22100 Lund, Sweden. anders.reinholdt@chem.lu.se.

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Researchers explored the chemistry of pnictogen mononitrides (E≡N), focusing on their triple bond stability and reactivity. Strategies were developed to stabilize these unusual bonding motifs for further study.

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Area of Science:

  • Inorganic Chemistry
  • Main-Group Chemistry
  • Chemical Bonding

Background:

  • Diatomic triple bonds in main-group elements are rare, with dinitrogen (N≡N) being exceptionally stable.
  • Heavier pnictogens (Group 15) typically form unstable triple bonds, decomposing readily.
  • Pnictogen mononitrides (E≡N, where E = P, As, Sb, Bi) represent a challenging yet intriguing class of compounds.

Purpose of the Study:

  • To survey the evolving chemistry of pnictogen mononitrides (E≡N).
  • To review methods for stabilizing and studying these reactive species.
  • To highlight the diverse reactivity and future research directions in E≡N chemistry.

Main Methods:

  • Review of gas-phase observations and cryogenic matrix isolation studies.
  • Analysis of recent synthetic strategies in solution.
  • Examination of stabilization techniques using organic fragments and transition metals.

Main Results:

  • Pnictogen mononitrides (E≡N) have transitioned from transient species to synthetically accessible compounds.
  • Stabilization strategies enable controlled studies of their unique reactivity.
  • Observed reactivity includes radical/closed-shell transformations, electrophilic/nucleophilic behavior, and E≡N group transfer.

Conclusions:

  • The chemistry of pnictogen mononitrides (E≡N) offers a rich playground for exploring multiple-bond reactivity in main-group elements.
  • Stabilized E≡N motifs open new avenues in inorganic and materials chemistry.
  • Further research is needed to fully elucidate the ambiguous and unexplored aspects of E≡N triple bond chemistry.