期刊
TETRAHEDRON LETTERS
卷 45, 期 4, 页码 723-727出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2003.11.048
关键词
anion recognition; tripodal receptors; thiouronium compounds; sulfate recognition; preorganization
Novel benzene-based tripodal isothiouronium receptors are synthesized for the selective recognition of tetrahedral oxoanions. The binding study by isothermal titration calorimetry indicates that the cationic receptors bind sulfate ions preferably in a tripodal mode. while they show a mixed binding mode toward phosphate ion. The tripodal isothiouronium receptors show large DeltaG(0) values toward sulfate ions in methanol, which are entropy driven. The results demonstrate that a subtle structural constraint can lead to different binding modes toward structurally similar anions. (C) 2003 Elsevier Ltd. All rights reserved.
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