A new sulfonamide-based chemosensor for potential fluorescent detection of Cu2þ and Zn2þ ions
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Date
2023
Authors
Amoah, C.
Obuah, C.
Ainooson, M.K.
Oppong, A.
Muller, A.
Journal Title
Journal ISSN
Volume Title
Publisher
Tetrahedron
Abstract
In recent times, there has been an increased demand in the search for probing materials for numerous
substances in the environment such as the detection of metals ions. In this study, a new class of
pyrazolyl-sulfonamide derivatives of para-nitroaniline were synthesized following a multistep approach.
The ligands and complexes were characterized using NMR spectroscopy, IR spectroscopy, and mass
spectrometry. All the compounds C1eC3 were synthesized in very good yields (85%e92%) and their
photo-physical properties measured. All the compounds show fluorescence behaviour with emissions
within the UV and far visible range with quantum yields between 7.7% and 25.7%. TD-DFT calculations
predictions for the electronic transitions present are in good agreement with experimental observations.
Fluorescent probing studies conducted on the compounds show that C1eC3 were analytically sensitive
and possessed significant selectivity towards Cu2þ (for C3) and Zn2þ (for C1 and C2) ions with detection
limits between 0.011 and 0.103 mg/L for Cu2þ ions and 0.002e0.135 mg/L for Zn2þ ions. Overall, C1 was
found to be the most sensitive molecule for the metals studied, having good quantum yield and better
selectivity for Zn2þ ion compared to Cu2þ.
Description
Research Article
Keywords
Fluorescent probes, Quantum yield, Electronic transition