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Enantioselective fluorescent sensors for chiral carboxylates based on calix[4]arenes bearing an L-tryptophan unit
被引:67
作者:
Qing, Guang-yan
[1
]
He, Yong-bing
[1
]
Wang, Feng
[1
]
Qin, Hai-juan
[1
]
Hu, Chen-guang
[1
]
Yang, Xi
[1
]
机构:
[1] Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R China
关键词:
calixarenes;
tryptophan;
fluorescence;
enantioselective recognition;
carboxylates;
NMR spectroscopy;
D O I:
10.1002/ejoc.200600917
中图分类号:
O62 [有机化学];
学科分类号:
070303 ;
081704 ;
摘要:
Two-armed chiral calix[4]arenes (3a-c) functionalized at the lower ring with L-tryptophan units have been prepared and the structures of these receptors characterized by IR, MS, H-1, and C-13 NMR spectroscopy and elemental analysis. The enantioselective recognition of these receptors has been studied by fluorescence titration and H-1 NMR spectroscopy. The receptors exhibited different chiral recognition abilities towards some enantiomers of chiral materials and formed 1:1 complexes between host and guest. Receptor 3a exhibits excellent enantioselective fluorescent recognition ability towards the N-Boc-protected alanine anion and 3b reveals good enantioselective recognition ability towards the enantiomers of mandelate. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007).
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页码:1768 / 1778
页数:11
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