Anthraquinone coupled benzothiazole-based receptor for selective sensing of Cu2+

  • Kumaresh GhoshEmail author
  • Debasis Kar
Original Article


A new and an easy-to-make simple anthraquinone-based molecular receptor 1 has been synthesized and its metal ion binding properties have been studied in CH3CN containing 0.01 % DMSO. The receptor site comprised of benzothiazole units is capable of selective sensing of Cu2+ ion over a series of other metal ions by exhibiting fluorescence quenching to a greater extent (~78 %). The receptor is also workable in aq. CH3CN (CH3CN:H2O = 4:1, v/v) and shows moderate binding of Cu2+ by exhibiting 62 % quenching of emission. In addition, the change in color of the receptor solution in polar organic solvent (e.g., DMSO) upon addition of Cu2+ at the concentration range ~10−3 M is worthwhile for the selective detection of Cu2+ ion by ‘naked eye’.

Graphical abstract


Anthraquinone-based sensor Benzothiazole binding site Copper ion recognition Fluorescence quenching 



The authors thank DST, Government of India for providing facilities in the department under FIST program. DK thanks CSIR, New Delhi, India for a fellowship.

Supplementary material

10847_2012_217_MOESM1_ESM.doc (2.8 mb)
Figures showing the change in absorption and fluorescence spectra of receptor 1, Binding constant curves and titration curve for 1 with Cu2+, MO’s of 1, Time resolved fluorescence are available (DOC 2896 kb)


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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  1. 1.Department of ChemistryUniversity of KalyaniKalyani, NadiaIndia

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