Colorimetric and turn-on Fluorescence Chemosensor for Hg2+ Ion Detection in Aqueous Media

  • Pydisetti Gurunadha Rao
  • Birudaraju Saritha
  • T. Siva RaoEmail author


A new rhodamine 6G based fluorescent and colorimetric chemosensor, containing N-methyl imidazole nucleus, for the selective detection of Hg2+ ion was designed and synthesized. The results of UV-Vis and fluorescence spectral study indicated that the receptor is selective and sensitive towards Hg2+ with no noticeable interference with other competitive metal ions. The addition of Hg2+ to the receptor induced a rapid color change to pink from colorless and the turn-on fluorescence response toward Hg2+ among different cations was studied. The stoichiometric ratio of 1:1 between the receptor and Hg2+ was supported by Job’s plot. The color change and turn-on fluorescence response upon addition of Hg2+ ion was ascribed by the spirolactam ring-opening mechanism. The probable mode of binding between the receptor and Hg2+ was confirmed by 1H NMR and Mass spectral study. For the practical application, its electrospun nanofiber test strips successfully applied to recognize Hg2+ ion in aqueous media.

Graphical Abstract

Schematic representation of Hg2+ detection by rhodamine based sensor


Mercury ion Sensing Fluorescent Nanofiber 


Supplementary material

10895_2018_2342_MOESM1_ESM.docx (1.2 mb)
ESM 1 (DOCX 1206 kb)


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Pydisetti Gurunadha Rao
    • 1
  • Birudaraju Saritha
    • 1
  • T. Siva Rao
    • 1
    Email author
  1. 1.Department of Inorganic & Analytical ChemistryAndhra UniversityVisakhapatnamIndia

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