Open AccessFluorescence Recognition of Al(III) Ions by a New Chemosensor Based E-4-((1-(10H-Phenothiazin-2-yl)ethylidene)amino)-N-(pyrimindin-2-yl)benzenesulfonamide
Author(s) -
P. Vijayakumar,
Mohan Doss,
S. Nargis Negar,
R. Renganathan
Publication year - 2021
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2021.23217
Subject(s) - chemistry , fluorescence , schiff base , detection limit , titration , ion , chelation , proton nmr , mass spectrometry , selectivity , nuclear chemistry , photochemistry , inorganic chemistry , catalysis , stereochemistry , chromatography , organic chemistry , physics , quantum mechanics
A novel Schiff base derivative E-4-((1-(10H-phenothiazin-2-yl) ethylidene)amino)-N-(pyrimindin-2-yl)benzenesulfonamide (BT) was synthesized and characterized by 1H & 13C NMR, FT-IR and massspectrometry. Compound BT acts as a detector for Al3+ in ethanol/water HEPES buffer solution (5mM, pH 7.4, v/v 1:4) at room temperature. The fluorescence intensity observed at 516 nm was increaseddue to Al3+ ion present with a fluorescence response “turn-on” process, when excited at 290 nm. Thisshows compound BT is coordinated to Al3+ ion through the NH group and C=NH of the Schiff baseblocking the photoinduced transfer (PET) and chelation induced enhanced fluorescence (CHEF) process,to increase the fluorescence intensity of BT. The detection limit of BT was in a micro-molar range forAl3+ ion, confirming high selectivity and sensitivity of BT. The BT-Al3+ ion binding mode and therecognition mechanism of chemosensor were explored by EDTA titration, Job’s plot, Mass and FT-IRanalysis. The theoretical support was established by DFT calculations.