About the structure of CH5 + and structural variations in related systems

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The carbocation CH5 + has a unique structure of Cs symmetry with three 2-center-2-electron bonds and one 3-center-2-electron bond. This ground-state geometry is different from the prediction by the VSEPR model. We have investigated this carbocation along with related systems, among them, BH5, BLi5, CLi5 +, NH5 2+, NLi5 2+, to seek possible trends and regularities in the variations of their ground-state geometries.

Original languageEnglish (US)
Pages (from-to)297-301
Number of pages5
JournalStructural Chemistry
Issue number2
StatePublished - Apr 1 2017


  • Carbocation CH
  • Five-coordinated systems of first- and second-row elements
  • Structural variations
  • VSEPR model


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