Abstract
A new chromogenic indoaniline–thiourea-based sensor was designed to recognize anions in an organic solvent through complementary intermolecular hydrogen bonding. Complexed anions cause significant disturbance to the intramolecular hydrogen-bonded structure of the sensor, which then induces color and UV–vis spectral changes. This sensor allows for selective colorimetric detection of tetrahedral oxoanions (HSO 4 − and H 2PO 4 −).
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