Urea-based receptors, containing electron-withdrawing chromogenic substituents, in a DMSO solution, in the presence of varying excess of fluoride, do not form H-bond complexes, but undergo stepwise deprotonation of the two N-H fragments, an event which is signaled by the development of vivid colors. Double deprotonation is also observed in the presence of hydroxide. Less basic anions (CH3COO-, H2PO4 -) induce deprotonation of only one N-H.

Why, on Interaction of Urea Based Receptors with Fluoride, Beautiful Colors Develop.

ESTEBAN GOMEZ, DAVID;FABBRIZZI, LUIGI;LICCHELLI, MAURIZIO
2005-01-01

Abstract

Urea-based receptors, containing electron-withdrawing chromogenic substituents, in a DMSO solution, in the presence of varying excess of fluoride, do not form H-bond complexes, but undergo stepwise deprotonation of the two N-H fragments, an event which is signaled by the development of vivid colors. Double deprotonation is also observed in the presence of hydroxide. Less basic anions (CH3COO-, H2PO4 -) induce deprotonation of only one N-H.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/26250
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