【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 spec
【机 构】
：
Institute of Applied Chemistry,Department of Chemistry,Key Laboratory of Chemistry for Natural Produ
【基金项目】
：
the International Collaborative Project of the Ministry of Science and Technology;the Foundation of the Governor of Guizhou Province;国家自然科学基金;the Key Project of Natural Science Foundation of Guizhou P
论文部分内容阅读
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 cucurbit[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 π-π stacked pairs which were cavity bound but also partly protruded from only one portal forming unsymmetrical host-guest complexes.In addition, these π-π stacked pairs formed orientation isomers within the confines of the cucurbit[8]uril cavity.
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