The synthesized dyes exhibited selective detection of cyanide with varying limits of detection, indicating their potential use as chemosensors.
Three indan-2-one-based donor–π–acceptor–π–donor type dyes with symmetric donor groups were synthesized and characterized to study their nonlinear optical (NLO) properties and their potential use in the rapid and selective determination of cyanide. The designed structures feature symmetrical alkylaminophenyl donor groups and a strong electron-withdrawing dicyanovinylene as an acceptor connected through vinyl groups as a π-bridge. These strongly π-conjugated organic dyes can absorb in the NIR region, and they showed sensitivity towards the polarity of solvents with colorimetric and optical changes. Because of the strong donor–acceptor structure, second-order NLO properties were studied by measuring electric field-induced second harmonic (EFISH) values, which showed significant second-order NLO responses. The experimental results were explained using density functional theory (DFT) methods. The dyes also exhibit chemosensor properties, showing selectivity for cyanide via a Michael addition mechanism that causes the disappearance of the ICT band, and a significant color change was observed in both organic and aqueous media. In addition, the interaction mechanism between cyanide and the chemosensor is determined by a 1 H NMR study and explained by DFT calculations.
Keleş et al. (Wed,) conducted a other in Cyanide detection using D–π–A–π–D indanone dyes. Symmetrical D–π–A–π–D indanone dyes was evaluated on Limit of detection (LOD) values for cyanide anions in DMSO/H2O binary solvent medium. The synthesized dyes exhibited selective detection of cyanide with varying limits of detection, indicating their potential use as chemosensors.