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A Colorimetric Approach to Anion Sensing: A Selective Chemosensor of Fluoride Ions, in which Color is Generated by Anion‐Enhanced π Delocalization
Author(s) -
Vázquez Miguel,
Fabbrizzi Luigi,
Taglietti Angelo,
Pedrido Rosa M.,
GonzálezNoya Ana M.,
Bermejo Manuel R.
Publication year - 2004
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200353148
Subject(s) - chromogenic , thiourea , delocalized electron , ion , fluoride , chemistry , hydrogen bond , combinatorial chemistry , photochemistry , inorganic chemistry , molecule , organic chemistry , chromatography
A colorless neutral receptor with no particular chromogenic substituents selectively recognizes fluoride ions with a concomitant development of a yellow color (see scheme). The receptor contains two equivalent arms, each equipped with a thiourea fragment. Color originates from the extended π delocalization induced by the strong hydrogen‐bonding interaction of the F − ion with the internal NH groups of thiourea moieties.