Anisotropic thermal expansion in 18-crown-6.2 H2O·2 HNO3

Maria Calleja, Sax A. Mason, Paul D. Prince, Jonathan W. Steed*, Clive Wilkinson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


Reaction of aqueous HNO3 with 18-crown-6 results in the isolation of the neutral inclusion compound 18-crown-6.2 H2O·2 HNO3. Variable temperature single crystal X-ray and neutron diffraction data reveal that the triclinic (P1̄) unit cell undergoes a highly anisotropic change in shape with temperature, with the crystallographic β angle changing smoothly from 66.56° to 69.03° between room temperature and 20 K. This arises from a change in shape of the crown ether in response to increases in hydrogen bond distances in the HNO3⋯H2O⋯crown ether chain.

Original languageEnglish (US)
Pages (from-to)28-31
Number of pages4
JournalNew Journal of Chemistry
Issue number1
StatePublished - 2003
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry
  • Materials Chemistry


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