標題: | A specific and ratiometric chemosensor for Hg2+ based on triazole coupled ortho-methoxyphenylazocalix[4]arene |
作者: | Wang, Nae-Jen Sun, Chung-Ming Chung, Wen-Sheng 應用化學系 Department of Applied Chemistry |
關鍵字: | Azocalix[4]arene;Click reaction;Triazole;Chemosensor;Mercury ion |
公開日期: | 21-十月-2011 |
摘要: | Calix[4]arene 3, which contains two distal triazole groups on the lower rim and two distal o-methoxyphenylazo groups on the upper rim, was synthesized and found to be a specific and ratiometric sensor for Hg2+ in a polar protic solvent. A series of o-methoxyphenylazo derivatives (3, 4, 5, 7, and 9) were synthesized, which proved that the lower-rim triazoles and the hydroxyl azophenol(s) were the major ligands for metal ion binding. Though analogues 4 and 10 showed some sensitivity for Hg2+, compound 3 was the only ratiometric chemosensor for Hg2+ among the series of azocalix[4]arenes synthesized in this work. The formation of 3. Hg2+ complex was supported by UV/vis and NMR titration studies and Mass spectrometry. Based on the symmetrical features of NMR spectra of 3 center dot Hg2+, the complex is believed to be symmetrical with respect to the calix[4]arene cavity. Furthermore, the complex was determined to be 1:1 binding stoichiometry by Job's plot, and the association constant was determined to be 4.02 x 10(3) M-1 using Benesi-Hildebrand plot. (C) 2011 Elsevier Ltd. All rights reserved. |
URI: | http://dx.doi.org/10.1016/j.tet.2011.08.052 http://hdl.handle.net/11536/150379 |
ISSN: | 0040-4020 |
DOI: | 10.1016/j.tet.2011.08.052 |
期刊: | TETRAHEDRON |
Volume: | 67 |
起始頁: | 8131 |
結束頁: | 8139 |
顯示於類別: | 期刊論文 |