80571-75-1Relevant academic research and scientific papers
Selective smartphone aided colorimetric detection of Hg(II) in an aqueous solution via metal ion-induced keto-enol tautomerism–Spectroscopic and theoretical studies
Elango, Kuppanagounder P.,Nandhini, C.,Saravana Kumar, P.,Shanmugapriya, R.,Vennila, K. N.
, (2021/08/03)
A simple Schiff base-based probe (CNB) is synthesized, characterized and explored as a naked eye visual detection colorimetric probe for Hg(II) ion in an aqueous solution. Upon adding a series of cations to CNB, only Hg(II) resulted in an instantaneous colour change from pale yellow to red-orange (bathochromic shift from 348 to 392 nm). 1H NMR results suggest a relatively new Hg(II) assisted keto-enol tautomerism phenomenon in the probe followed by the enol –OH coordination with the metal ion after deprotonation. CNB forms a 1:1 Hg(II) complex with high selectivity and sensitivity, high binding constant (5×106 M?1), and an acceptable limit of detection (7 μM). The resultant CNB-Hg(II) complex has been characterized using FT-IR, 1H NMR and HR-MS spectral techniques. The electronic spectra of CNB and its Hg(II) complex are explored using Density Functional Theory (DFT) and Time-Dependent DFT (TD-DFT) methods. The results indicate that the energy of S0→S1 transition decreases (0.58 eV) after the complex formation, responsible for the bathochromic shift observed upon addition of Hg(II) to CNB. The practical utility of CNB to quantify Hg(II) in natural water samples is successfully confirmed using a smartphone.
Synthesis of Schiff bases derived from 3-hydroxy-2-naphtoic acid hydrazide and study of their complexes with Co(II), Ni(II), Cu(II) and Zn(II)
Osman, M. M.,Refaat, L. S.,Obeid, N.
, p. 335 - 339 (2007/10/02)
The complexes of Co(II), Ni(II), Cu(II) and Zn(II) with some new Schiff bases have been synthesized and characterized by chemical analysis and by magnetic and spectral measurements.The Schiff bases are derived from 3-hydroxy-2-naphtoic acid hydrazide and each of benzoylacetone, acetylacetone, ethyl acetoacetate, α-picolyl-phenyl-ketone and isatine.Two series of complexes have been obtained with the ethyl acetoacetate derivative due to variable condensation sites of the β-carbonyl ester.Generally, Cu(II) and Zn(II) have a great tendency to form molecular associated complexes with the divalent tridentate ligand anion while Co(II) and Ni(II) prefer bonding with the monovalent anion to give monomeric compounds.
