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) 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.
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