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Exploration of fluorescence behavior of an imidazolium-based chemosensor in solution and in the solid state and its turn-on response to Al3+ in pure aqueous medium

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Abstract

An imidazolium-based quinoline Schiff base ImSB was developed and fully characterized by FT-IR, 1H and 13C NMR spectroscopy, mass spectrometry, and X-ray crystallography. The fluorescence behaviour of ImSB in solution and in the solid state, keto–enol stability at different concentrations and pH in aqueous medium were investigated. The UV-visible and fluorescence studies were performed to determine the response of ImSB towards different ions in aqueous medium. ImSB showed a turn-on fluorescence behaviour with high selectivity towards Al3+ over various cations and anions due to chelation-enhanced fluorescence (CHEF), inhibition of photoinduced electron transfer (PET) and restriction of C[double bond, length as m-dash]N isomerization. The low detection limit for Al3+ was 54 nM and Job's plot confirmed 1 : 1 stoichiometry between ImSB and Al3+ with a high binding constant value of 4.16 × 106 M−1. Monitoring of Al3+ was also demonstrated in real water samples (mineral, river and tap water). The structural and electronic parameters of ImSB and ImSB-Al3+ were also studied theoretically.

Graphical abstract: Exploration of fluorescence behavior of an imidazolium-based chemosensor in solution and in the solid state and its turn-on response to Al3+ in pure aqueous medium

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Article information


Submitted
03 Dec 2019
Accepted
17 Apr 2020
First published
18 Apr 2020

Photochem. Photobiol. Sci., 2020, Advance Article
Article type
Paper

Exploration of fluorescence behavior of an imidazolium-based chemosensor in solution and in the solid state and its turn-on response to Al3+ in pure aqueous medium

V. Saini, R. Krishnan and B. Khungar, Photochem. Photobiol. Sci., 2020, Advance Article , DOI: 10.1039/C9PP00477G

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