Anions Probe Based On Hydrogen Bonding

Anions play a fundamental role in a wide range of chemical and biological processes, and considerable effort has been devoted to the development of abiotic receptors for anionic species. Recently a large number of excellent examples of anion receptors and luminescent sensors for anions have been produced and several reviews have appeared over the last few years. Color changes, as signaling an event detected by the naked eye, are widely used owing to the low cost or the lack of required equipment. The strategy to prepare colorimetric anion sensors is the binding site-signaling unit approach in which an appropriate chromophore is attached to a specific anion receptor. Owing to the ability of hydrogen bond, and many ligands containing either one or two of NH have been reported to be excellent sensors for dicarboxylate anions. Compared with well-known types of hydrogen bonding for anions with amides, pyrroles, ureas and sulfonamide, phenylhyd-razone-based receptors for anions are rare though they have strong binding ability with anions and are readily available. In the presence of the anions, the N-H...X or anion-induced deprotonation of the NH groups was observed. The present paper contains following three aspects:Firstly, We synthesized P1, P2 based on Coumaric aldehyde, We used Uv-absorption spectra and florescence emission spectrophotometric titration,1H-NMR and ESI-MS spectra methods for the study of process and mechanism for the detection. Two probes containing NH groups which can bond with the F- and H2PO4- form hydrogen bonds. In halogen, two probes have a selectivity and sensitivity for F-Based on the first part, introduce the color group 2,4-dinitrophenylhydrazine which bonds with Iridium complexes based on shiff reaction required P3 and P4, We used Uv-absorption spectra and florescence emission spectrophotometric titration,1H-NMR and ESI-MS spectra methods for the study of mechanism. In halogen, two probes have a selectivity and sensitivity for F-. In the processes, which associated with color change.Based on the first two parts, we chose acenaphthene quinine, pyrene ketone with 2,4-dinitrophenylhydrazine based on shiff base reaction required P5 and P6,We used spectrophotometric titration,1H-NMR and ESI-MS spectra methods for the study of mechanism. Also, we chose coumaric aldehyde with 2,4-dinitrophenylhydrazine based on shiff base reaction required P7, which had a selectivity and sensitivity for H2PO4-. It proved that the probes achieved by hydrogen bonds. We made P5, P6 and P7 into the test strips which can be used to detect Fˉin water, the limited detection was 10mg-L'.