2026-04-17T09:01:07Z https://www.eurjchem.com/index.php/eurjchem/oai

oai:ojs.www.eurjchem.com:article/2360 2023-06-30T02:16:04Z eurjchem:ART driver

A hydroxypropiophenone-based fluorescent probe for the selective determination of Al(III) ions in aqueous ethanol Singh, Chandni Singh, Divya Pratap Singh, Sunil Kumar Dwivedi, Romi Singh, Ashish Kumar Singh, Vinod Prasad Dihydrazone UV-vis study Chemical sensor Fluorescence study Density functional theory Chelation-enhanced fluorescence In this work, we have synthesized a novel dihydrazone-based fluorescent probe N'1,N'2-bis{1-(2-hydroxyphenyl)propylidene}oxalohydrazide (H2hpoh)for Al3+ ions by a simple condensation reaction. The prepared organic probe has been characterized by different physicochemical and spectroscopic techniques. The single-crystal structure of the receptor has also been reported. Crystal data for C20H22N4O4: monoclinic, space group P21/c (no. 14), a = 6.0747(15) Å, b = 11.621(5) Å, c = 13.453(4) Å, β = 94.61(3)°, V = 946.6(5) Å3, Z = 2, T = 293(2) K, μ(MoKα) = 0.096 mm-1, Dcalc = 1.342 g/cm3, 4046 reflections measured (6.076° ≤ 2Θ ≤ 58.05°), 2149 unique (Rint = 0.0876, Rsigma = 0.2223) which were used in all calculations. The final R1 was 0.0972 (I > 2σ(I)) and wR2 was 0.2316 (all data). The ethanolic aqueous solution of the probe shows enhanced fluorescence in the presence of Al3+ ions, whereas no appreciable change in the spectral pattern is observed in the presence of other cations, i.e., Na+, K+, Ca2+, Ba2+, Mn2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, Cr3+, Cd2+ and Hg2+. The binding mode of the receptor with Al3+ ions was studied using various spectral titration techniques such as UV-visible, fluorescence, and 1H NMR. The receptor acts as a dibasic hexadentate ligand and interacts with two Al3+ ions with a high binding constant KB = 8.99×1010 1/M. The lowest detection limit for the Al3+ complex of H2hpoh was determined to be 7.8×10−5 M. With the help of DFT calculations, the mechanism of fluorescence enhancement has been explained. Atlanta Publishing House LLC 2023-03-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf text/plain https://www.eurjchem.com/index.php/eurjchem/article/view/2360 10.5155/eurjchem.14.1.99-108.2360 European Journal of Chemistry; Vol. 14 No. 1 (2023): March 2023; 99-108 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/2360/pdf_2360 https://www.eurjchem.com/index.php/eurjchem/article/view/2360/2744 Copyright (c) 2023 Authors