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

被引：23
|
作者：
Calleja, M
Mason, SA
Prince, PD
Steed, JW [1 ]
Wilkinson, C
机构：
[1] Kings Coll London, Dept Chem, London WC2R 2LS, England
[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
[3] Kings Coll London, Dept Phys, London WC2R 2LS, England
来源：
NEW JOURNAL OF CHEMISTRY | 2003年 / 27卷 / 01期
关键词：
D O I：
10.1039/b207292k
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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) over bar) unit cell undergoes a highly anisotropic change in shape with temperature, with the crystallographic beta angle changing smoothly from 66.56degrees to 69.03degrees 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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收藏
页码：28 / 31
页数：4
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