Journal
TETRAHEDRON LETTERS
Volume 47, Issue 7, Pages 1193-1196Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2005.12.009
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Three new chromogenic receptors (1, 2, and 3) containing p-nitrophenyl or p-nitronaphthyl or methyl groups appended to the thiourea groups were synthesized and characterized. Upon addition of a series of dicarboxylate anions to receptor 1 in DMSO, only the appearance of the Solution of receptor 1 with malonate showed a color change from blue to yellow which can be detected by the naked eye at parts per million. With the addition of the series of dicarboxylate anions to receptor 2, the Solutions showed an indistinct intense dark-red color. Whereas the addition of the same dicarboxylate anions to receptor 3, the solutions did not induce any color change. Thus, for the unique color change, the receptor 1 can act as an optical chemosensor for the malonate anion even in the presence of other dicarboxylate anions. (c) 2005 Elsevier Ltd. All rights reserved.
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