The Synthesis Of Aromaticity Parents Ligands And The Detection Of The Metal Ions

As we all know, the trivalent metal ions (M3+) play critical roles in fundamental processes, including osmotic regulation, catalysis, metabolism, biomineralization, and signaling. Therefore, quick and efficient detection and recognition of various trivalent metal cations is important for the environment and human daily physiological activity. X-ray Photoelectron Spectrometer (XPS), Inductive Coupled Plasma Emission Spectrometer (ICP) and Atomic Fluorescence Spectroscopy (AFS) can detect M3+ metal ions. Compared with these expensive and complicated methods, fluorescent molecular probes are widely used in the detection and recognition of metal ions due to their high sensitivity, specificity, selectivity, fast response time, low detection limit and easy operation. However, fluorescent probes for M3+which have been reported at present have many problems, such as complex synthetic steps, poor solubility and the detection of single metal ions. These limit the development of fluorescent probes. The thesis launched a series of studies, and focused on the synthesis of a new type of functional molecules as a fluorescent probe, and launched a series of studies of the luminescence performance; the main results are as follows:An amphipathic molecular QC12PyBr was synthesized with a hydrophobic quinoline head and a hydrophilic pyridinium tail. This amphiphilic molecular structure makes the molecule exhibit ideal sensitive performance in three kinds of solvents, including EtOH, CH3CN and H2O. It can be used as fluorescent probe for the selective detection of five trivalent metal cations, Al3+, Fe3+, Cr3+, Au3+ and Ru3+. And stoichiometry of QC12PyBr to Al3+, Cr3+, Au3+, Ru3+ is 1:1, whereas the formation of 2:1 complexes was observed for Fe3+. The detection limits of QC12PyBr to M3+ ions reach micromolar range. Primary Component Analysis (PCA) is non-supervised mathematical methods that can analysis the measured data. The discriminating features of five metal cations are significant, and replacement of solvents has few effects to the intrinsic differences of the cations. The PCA plot exhibits an excellent discrimination and recognition of the five trivalent metal cations. NMR titration further proves the formation of the ligand-to-metal complex, and indicates that nitrogen and oxygen atoms at the quinoline moiety take part in the coordination process.