Highly selective Schiff base derivatives for colorimetric detection of Al

Abstract

Schiff base derivatives NBAR and NSAR were developed for selective detection of Al 3+ in aqueous solution. UV-vis spectroscopic studies revealed that NBAR and NSAR showed marked sensitivity and selectivity to Al 3+ in acetonitrile (ACN)/water (v/v, 1:1, pH 6.80). The NBAR and NSAR receptors bound Al 3+ in a 2:1 stoichiometry with apparent binding constants 4.09 × 10 11 M −2 and 1.65 × 10 12 M −2 , respectively. They also displayed distinct changes in color upon the alteration of free Al 3+ levels in solution with reversible responses and showed little interference with other metal ions.