Aromatic aldehyde based chemosensors for fluoride and cyanide detection in organic and aqueous medium: Ascertained by characterization, Spectroscopic and DFT Studies

Publication date: Available online 18 May 2019Source: Inorganica Chimica ActaAuthor(s): Suresh N. Kodlady, B. Narayana, B.K. Sarojini, B.U. GauthamaAbstractIn the present investigation, a series of new aromatic aldehyde based chemosensors (S1-S4) have been sensibly designed and synthesized by the simple condensation reaction and their anion sensing properties were investigated. The compounds were characterized by spectroscopic techniques such as FT-IR, UV-Visible, 1H NMR, 13C NMR and ESI-MS. The probes exhibited high sensitivity and selectivity towards fluoride and cyanide ions over the anions such as Br -, HSO-4, Cl-, OH-, I-, NO-2 and NO-3 in dry DMSO and DMSO-water mixture (DMSO: H2O 9:1 v/v). The binding mechanism of fluorometric chemosensors with N-H-F and N-H-CN ion was determined based on 1H NMR titration and were also theoretically supported by DFT (Density functional theory) calculation. The stoichiometry and binding constant (Ka) of the host-guest complexes formed were determined by the Benesi–Hildebrand (B–H) plot and Job's method respectively. Finally, economically visible paper-based colorimetric “test stripes” of (S1-S4) were fabricated to the detection of F- and CN- ions in 100% aqueous solution.Graphical abstract

Source: Inorganica Chimica Acta - May 19, 2019 Category: Chemistry Source Type: research