Optical sensing of hydrogen sulphate using rhodamine 6G hydrazide from aqueous medium

  • Spectrochim Acta A Mol Biomol Spectrosc. 2017 Jun 5;180:44-50. doi: 10.1016/j.saa.2017.02.057.
Yachana Upadhyay  1 ,  Shilpa Bothra  1 ,  Rajender Kumar  1 ,  Heung-Jin Choi  2 ,  Suban K Sahoo  3
Affiliations
  • 1. Department of Applied Chemistry, S.V. National Institute of Technology (SVNIT), Surat 395007, India.
  • 2. Department of Applied Chemistry, Kyungpook National University, Daegu, 41566, South Korea.
  • 3. Department of Applied Chemistry, S.V. National Institute of Technology (SVNIT), Surat 395007, India. Electronic address: [email protected].
PMID: 28264789 DOI: 10.1016/j.saa.2017.02.057
Abstract

This communication reports the application of rhodamine 6G hydrazide (L) for the selective colorimetric and turn-on fluorescent sensing of hydrogen sulphate ions from aqueous medium. The ring opening of the colourless spirocyclic form of L was selectively triggered in the presence of HSO4- among the Other tested anions (F-, Cl-, Br-, I-, AcO-, H2PO4-, NO3-, ClO4-, CN-, HO-, AsO33- and SO42-), which gives rise to a pink colour and strong fluorescence in the visible region. Sensor L showed a detection limit down to micromolar range without any interference from the Other tested competitive anions. Sensor L was applied for the construction of two inputs (HO- and HSO4-) INHIBIT type molecular logic gate and naked-eye detection of HSO4- using test paper strips.

Keywords
Colorimetric; Hydrogen sulphate sensor; Logic gate; Rhodamine 6G hydrazide; Turn-on fluorescence.
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