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 \(\hbox {Cu}^{2+}\) (pale orange to pink) and \(\hbox {F}^{-}\) (orange to blue). The detection limit by ANBP to \(\hbox {Cu}^{2+}\) (6.82 \(\upmu \)M) was far below WHO guideline value (31.3 \(\upmu \)M). Moreover, ANBP could quantify \(\hbox {Cu}^{2+}\) in aqueous samples. 1:1 binding mode between ANBP and \(\hbox {Cu}^{2+}\) or \(\hbox {F}^{-}\) was proposed by ESI-mass analyses and Job plots. The remarkable color changes with \(\hbox {Cu}^{2+}\) and \(\hbox {F}^{-}\) 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 \(\hbox {Cu}^{2+}\) (pale orange to pink) and \(\hbox {F}^{-}\) (orange to blue).
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We acknowledge the National Research Foundation of Korea (NRF-2018R1A2B6001686).
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Yun, D., Chae, J.B. & Kim, C. A novel benzophenone-based colorimetric chemosensor for detecting \(\hbox {Cu}^{2+ }\) and \(\hbox {F}^{-}\). J Chem Sci 131, 10 (2019). https://doi.org/10.1007/s12039-018-1585-2
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DOI: https://doi.org/10.1007/s12039-018-1585-2