Chemosensor For Fluoride Ions Research Articles

Vitamin B6-based fluorescence chemosensor for selective detection of F- ions: design, synthesis, and characterization.

The present paper reports on the synthesis and characterization of a new chemosensor for fluoride ions, a hydrazone derived from pyridoxal 5'-phosphate and benzothiazole. The structure of the chemosensor was confirmed using 1H and 13C NMR, FT-IR and mass spectroscopy. The conformational diversity of the chemosensor influencing the sensor activity was studied by the quantum chemistry methods on the B3LYP/6-311++G(d, p) (H, C, N, O, P, S) level, and the optimal structure of the chemosensor was chosen. The selective capability of detecting F- in the aqueous solution, which also contains Cl-, Br-, I-, NCS-, ClO4-, HSO4-, and NO3- was demonstrated. The detection limit (LOD) for fluoride ions was 0.22µM as determined by the 3σ method. The turn-on effect in the presence of fluoride ions is based on the deprotonation of the chemosensor and its subsequent aggregation in DMSO. In addition, the chemosensor was used for the detection and estimation of F- in real samples using fluorescence spectroscopy.

Functionalized Ni@SiO2Core/Shell Magnetic Nanoparticles as a Chemosensor for Fluoride Ion

E-mail: jonghwa@gnu.ac.kr (J. H. Jung); kykwon@gnu.ac.kr (K.-Y. Kwon)Received December 26, 2011, Accepted January 30, 2012Key Words : Magnetic nanoparticles, Fluoride sensing, ChemosensorsMolecular receptors with optical properties that can bechanged upon binding to specific guest ligands are of greatinterest due to their potential application as molecule-basedsensor devices. The detection of anionic guest molecules isof particular significance due to the fact that negativelycharged species play a critical role in biological, chemical,and environmental processes.