Host-guest complexes of cucubit[8]uril with phenanthrolines and some methyl derivatives

被引：0
作者：
Haiyan Fu
Saifeng Xue
Lan Mu
Ying Du
Qianjiang Zhu
Zhu Tao
Jianxin Zhang
Anthony I Day
机构：
[1] Guizhou University,Institute of Applied Chemistry
[2] The Normal University of Guizhou,Department of Chemistry
[3] Key Laboratory of Chemistry for Natural Products of Guizhou Province,Chemistry Discipline, School of Physical Environmental and Mathematical Sciences
[4] University College UNSW,undefined
[5] Australian Defence Force Academy,undefined
来源：
Science in China Series B: Chemistry | 2005年 / 48卷
关键词：
H NMR technique; fluorescence; cucurbit[8]uril; phenanthroline; host-guest; orientation isomers;
D O I：
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学科分类号：
摘要：
The host-guest relationship between cucurbit[8]uril, phenanthrolines and some methyl substituted 1,10-phenanthrolines has been investigated by using 1H NMR spectroscopy and fluorescence spectroscopy. The results showed that phenanthrolines as molecular guests bind in the cavity and portal of cucurbit[8]uril in a ratio of 2:1 (guest to host). The phenanthroline isomers 1,10-,1,7- and 4,7- showed red shifts between 47 and 108 nm and pronounced increases in fluorescent intensity. These same isomers produced inclusion complexes with cucur-bit[8]uril which had moderate to fast exchange rates on the 1H NMR time scale. The methyl substituted 1,10-phenanthrolines studied gave stable inclusion complexes in a ratio of 2:1 which showed slow exchange rates. These guests formed п-п stacked pairs which were cavity bound but also partly protruded from only one portal forming unsymmetrical host-guest complexes. In addition, these п-п stacked pairs formed orientation isomers within the confines of the cucur-bit[8]uril cavity.
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页码：305 / 314
页数：9
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