A novel benzophenone-based colorimetric chemosensor for detecting Cu 2 + and F -

Abstract

Abstract: A novel selective colorimetric chemosensor ANBP ((E)-(2-(((8-hydroxy-2,3,6,7-tetrahydro-1H,5H-pyrido[3,2,1-ij]quinolin-9-yl)methylene)amino)-5-nitrophenyl)(phenyl)methanone), based on the combination of benzophenone group and julolidine chromophore, was synthesized. Sensor ANBP showed rapid colorimetric responses toward Cu 2 + (pale orange to pink) and F - (orange to blue). The detection limit by ANBP to Cu 2 + (6.82 μ M) was far below WHO guideline value (31.3 μ M). Moreover, ANBP could quantify Cu 2 + in aqueous samples. 1:1 binding mode between ANBP and Cu 2 + or F - was proposed by ESI-mass analyses and Job plots. The remarkable color changes with Cu 2 + and F - resulted from the intramolecular charge transfer (ICT) effect, which was demonstrated by theoretical calculations. Graphical abstract: A novel selective colorimetric chemosensor ANBP, based on the combination of benzophenone group and julolidine chromophore, was designed and synthesized. Sensor ANBP showed rapid colorimetric responses toward Cu 2 + (pale orange to pink) and F - (orange to blue). [Figure not available: see fulltext.]