The Synthesis And Information Extraction Of New Type Molecular Devices Based On Lfavylium And Other Compounds

Flavylium compounds constitute an important family of molecules that comprisesanthocyanins, the ubiquitous dyes which are found in flowers and fruit. In this paper,fluorescent molecular devices based on flavylium and calixarene were elucidated.We synthesizes a series of fluorescent probes （compounds AH⁺and compounds Ct） baseon flavylium and fluorescein. Compounds were synthesized with high production rate andless by-products. We researched the change of fluorescence and absorbance in differentexternal conditions such as solvent, pH, and illumination using UV absorption andfluorescence emission spectra. Compounds in different environment have different structure.In acid environment, the structure is AH⁺. In neutral environment, the structure is Ct. Inalkaline environment, the structure is Ct2-. Chalcone （compound Ct） changes to compoundCc under the 365 nm UV irradiation. The compound Cc changes back to compound Ct underthe 254 nm UV irradiation. Fluorescence quantum efficiency was measured. The structuraltransformation of compounds and the pKavalue were discussed with a stable pH gradient.Finally, we hypothesized scheme of the structural transformations.A new calix[4]arene derivative 2 with naphthalene fluorophores at the lower rim wassynthesized. The chemosensing behavior of the host compound 2 for metal ions wasinvestigated by UV - Vis and fluorescence spectra. It exhibits high sensitivity toward Ag+overa wide range of metal ions in C₂H₅OH/H₂O （v/v，3：2）. The fluorescence quenching behaviorwas observed under binding of the Ag+ion with a detection limit down to the 2.34×10^-7mol/L range（in the presence of Cu2+interference）.