Issue 1, 2003
From the journal:

New Journal of Chemistry

Anisotropic thermal expansion in 18-crown-6·2 H2O·2 HNO3

Maria Calleja,a   Sax A. Mason,b   Paul D. Prince,a   Jonathan W. Steed*a  and  Clive Wilkinsonbc  

* Corresponding authors

a Department of Chemistry, King's College London, Strand, London, UK
E-mail: jon.steed@kcl.ac.uk
Fax: +44 (0) 20 7848 2810
Tel: +44 (0) 20 7848 2117

b Institut Laue Langevin, B.P. 156, Grenoble cedex 9, France

c Department of Physics, King's College London, Strand, London, UK

Abstract

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 (P[1 with combining macron]) 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.

Graphical abstract: Anisotropic thermal expansion in 18-crown-6·2 H2O·2 HNO3

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Article information

DOI
https://doi.org/10.1039/B207292K
Article type
Paper
Submitted
24 Jul 2002
Accepted
14 Oct 2002
First published
25 Nov 2002

New J. Chem., 2003,27, 28-31

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Anisotropic thermal expansion in 18-crown-6·2 H2O·2 HNO3

M. Calleja, S. A. Mason, P. D. Prince, J. W. Steed and C. Wilkinson, New J. Chem., 2003, 27, 28 DOI: 10.1039/B207292K

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