Anion sensing properties of new colorimetric chemosensors based on macrocyclic ligands bearing three nitrophenylurea groups

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Abstract

Two new colorimetric ligands (1-2) based on macrocyclic structures linked to three nitrophenylurea groups were synthesized in good yields and their responses toward anions were studied Anions with different shape such as of fluoride chloride bromide iodide hydroxide nitrate perclhorate cyanide or dihydrogen phosphate in DMSO solution were added and only fluoride hydroxide cyanide and dihydrogen phosphate enhances pi delocalization and shifts the pi-pi transition in both ligands leading to the generation of a pleasant orange color The result is a balance between the acidity of the nitrophenylurea-NH donors modulated by the basic character of the anions Stability constants for both receptors and the anions fluoride hydroxide cyanide and dihydrogen phosphate were determined spectrophotometrically using the program HYSPEC H-1 NMR titrations experiments with fluoride were carried out (C) 2010 Elsevier Ltd All rights reserved
Original languageUnknown
Pages (from-to)9223-9230
JournalTetrahedron
Volume66
Issue number47
DOIs
Publication statusPublished - 1 Jan 2010

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