期刊
DALTON TRANSACTIONS
卷 42, 期 10, 页码 3552-3560出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2dt32115g
关键词
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资金
- Natural Science Foundation of China [21165006]
- Fund of the International cooperation projects of Guizhou Province [20107002]
- Chun-Hui Fund of Chinese Ministry of Education [Z 2011033, Z 2011037]
A new type of thiacalix[4]arene-based chemosensor 2a and 2b containing amino groups as a binding site and 7-nitrobenzo-2-oxa-1,3-diazole (NBD) as a chromophore have been synthesized and characterized by single crystal X-ray diffraction and by NMR spectroscopic methods. Each receptor acted as a strong colorimetric and fluorometric sensor for silver ions and exhibited significant stepwise deprotonation of NH as evidenced by a bathochromic shift in both the UV-vis absorption and fluorescence emission spectra after addition of an Ag+ cation. Furthermore, the metal-ligand complex 2a center dot Ag+ can be exploited as an ion-pair receptor for the recognition of F-, AcO- or I- anions through switching the detection signal output (can been distinguished by 'naked eye'). However, receptor 2b center dot Ag+ displays a selective response only to iodide ion. These results could be attributed to the slightly different structural conformation between receptors 2a and 2b, which are derived from a 1,3-alternate-thiacalix[4]arene scaffold, suggesting they play a key role in the selective and binding ability of the host chemosensors.
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