Journal
TETRAHEDRON LETTERS
Volume 48, Issue 41, Pages 7274-7278Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2007.08.045
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A novel chromogenic calix[4]arene 3, which has within a molecule both the triazoles and the hydroxyl azophenols as the metal-binding sites and the azophenol moiety as a coloration sites was designed and synthesized. Calix[4]arene 3 is highly sensitive to Ca2+ and Pb+ ions, which can be detected by the naked eye. Furthermore, the association constants for the 1:1 complexes of 3 center dot Ca2+ and 3 center dot Pb2+ were determined to be 7.06 x 104 M-1 and 8.57 x 103 M-1, respectively. (c) 2007 Elsevier Ltd. All rights reserved.
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