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

Authors
  • Rao, Pydisetti Gurunadha1
  • Saritha, Birudaraju1
  • Siva Rao, T.1
  • 1 Andhra University, Department of Inorganic & Analytical Chemistry, Visakhapatnam, Andhra Pradesh, 530003, India , Visakhapatnam (India)
Type
Published Article
Journal
Journal of Fluorescence
Publisher
Springer-Verlag
Publication Date
Jan 06, 2019
Volume
29
Issue
2
Pages
353–360
Identifiers
DOI: 10.1007/s10895-018-02342-4
Source
Springer Nature
Keywords
License
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Abstract

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 AbstractSchematic representation of Hg2+ detection by rhodamine based sensor

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