RT Journal Article
T1 Exploring the Chelating Potential of an Easily Synthesized Schiff Base for Copper Sensing
A1 Sanmartín Matalobos, Jesús
A1 García Deibe, Ana María
A1 Zarepour Jevinani, Morteza
A1 Aboal Somoza, Manuel
A1 Bermejo Barrera, Pilar
A1 Fondo Busto, María Matilde
K1 X-ray
K1 Fluorescence
K1 UV-Vis
K1 CuO NPs
K1 Cu2+ ions
K1 Schiff base
AB The present study deals with the investigation of Cu2+, Ni2+ and Pd2+ chelating potential of the Schiff base, (E)-N-(2-((2-hydroxybenzylidene)amino)benzyl)-4-methylbenzenesulfonamide (H2SB). Crystal structures of Ni(HSB)2, Pd(HSB)2 and Cu(HSB)2 have been elucidated from single crystal X-ray diffraction data. NMR spectroscopy showed the presence of two conformers of Pd(HSB)2 in solution, both with an E configuration of the ligand. The determination of binding constants by fluorescence quenching showed that affinity of H2SB to Cu2+ in solution is higher than for Ni2+ and Pd2+. Since there is a high demand for selective, sensitive, rapid and simple methods to detect copper in aqueous samples (both as Cu2+ ions and as CuO NPs), we have explored H2SB as an optical chemosensor. H2SB interacts with increasing concentrations of Cu2+ ions, giving rise to a linear increase in the absorbance of a band centered at about 392 nm. H2SB displays a high selectivity toward Cu2+, even in the presence of the most common metal ions in water (Ca2+, Mg2+, Na+, K+, Al3+ and Fe3+), and some heavy transition metal ions such as the soft acids Pd2+ and Cd2+. H2SB also interacts with increasing concentrations of CuO NPs, which gives rise to a linear decrease in its fluorescence intensity (λem = 500 nm, λex = 390 nm). Quenching has occurred as a result of the formation of a non-fluorescent ground-state surface complex H2SB–CuO NPs. The limits of detection and quantification of CuO NPs were 9.8 mg/L and 32.6 mg/L, respectively. The presence of TiO2, Ag and Au NPs does not interfere with the determination of CuO NPs
PB MDPI
YR 2020
FD 2020
LK http://hdl.handle.net/10347/23500
UL http://hdl.handle.net/10347/23500
LA eng
NO Sanmartín-Matalobos, J.; García-Deibe, A.; Zarepour-Jevinani, M.; Aboal-Somoza, M.; Bermejo-Barrera, P.; Fondo, M. Exploring the Chelating Potential of an Easily Synthesized Schiff Base for Copper Sensing. Crystals 2020, 10, 235
NO This research was funded by the Ministerio de Ciencia, Innovación y Universidades of Spain and Unión Europea (Fondo europeo de desarrollo regional) Ref. RTI2018-099222-B-I00; Dirección Xeral de I+D-Xunta de Galicia, Grupos de Referencia Competitiva (Ref. ED431C2018/19) and Strategic Grouping in Materials AEMAT (ED431 E2018/0)
DS Minerva
RD 23 abr 2026