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

Yachana Upadhyay; Shilpa Bothra; Rajender Kumar; Heung-Jin Choi; Suban K Sahoo

doi:10.1016/j.saa.2017.02.057

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. Epub 2017 Feb 28.

Authors

Yachana Upadhyay¹, Shilpa Bothra¹, Rajender Kumar¹, Heung-Jin Choi², Suban K Sahoo³

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: suban_sahoo@rediffmail.com.

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^-, AsO₃^3- and SO₄^2-), 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.