Journal of Chemical Sciences

, 131:10 | Cite as

A novel benzophenone-based colorimetric chemosensor for detecting \(\hbox {Cu}^{2+ }\) and \(\hbox {F}^{-}\)

  • Dongju Yun
  • Ju Byeong Chae
  • Cheal KimEmail author
Regular Article


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).


Fluoride colorimetric chemosensor copper ion theoretical calculations 



We acknowledge the National Research Foundation of Korea (NRF-2018R1A2B6001686).

Supplementary material

12039_2018_1585_MOESM1_ESM.pdf (1.4 mb)
Supplementary material 1 (pdf 1382 KB)


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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Department of Fine ChemistrySeoul National University of Science and TechnologySeoulRepublic of Korea

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