Synthesis, Characterization And Preliminary Study Of Applications In Analysis Of The Complexes Of Nitrogen Heterocyclic And CuI Compounds

Metal coordination supramolecular of crystal engineering is one of the most active fields of science about chemistry and molecular research. Heterocyclic compounds as ligands and metal complexes is easy to form a variety of one-dimensional, two-dimensional, three-dimensional structure of the supramolecular complexes. The special multidimensional network structure has the material structure theory research value. These substances have magnetism, catalysis, optics, the main object of chemical and electrical properties of special molecules. It has potential application in these fields.Heterocyclic compounds reported using bipyridine derivatives and other complex heterocyclic compounds as ligands, at the same time or using carboxylic acid as auxiliary ligands, the ligands coordination the metal to the metal coordination supramolecular complexes. The structure of the complex is intricacy and less research on properties and application. This thesis adopts a simple molecular structure with two N atoms of Ligustrazine and matrine as ligand, synthesis of nitrogen heterocyclic metal complexes With the coordination of CuI, add new members as the nitrogen heterocyclic compound family. Through study on the structure and properties of the complexes, rich the class with the structure characteristic, try the properties in the analysis application.First, In the aqueous solution at room temperature, synthesis of Tetramethylpyrazine and CuI to bright yellow complexes, culture complex single crystal, through infrared spectroscopy, X-ray diffraction, X-ray powder diffraction and polarized light microscopy observation, characterization of the molecular structure. Ligustrazine and CuI with crystals of a regular cube cylindrical, molecular formula of compounds for Cu2I2N2C8H12, crystal structure formula [Cu2I2N2C8H12]∞, the crystal structure showed symmetry center. The complexes by Cu2I2N2 structure combined with Ligustrazine nucleus formation of single stranded supramolecular compounds. By electrostatic attraction intermolecular force and non covalent supramolecular interactions I···π or Cu···π connected to form an ABAB type planar structure.Two-dimensional layered structure by [Cu2I2] node and pyrazine ring on the big π bond, namely π-π interaction will molecular expand into a three-dimensional supramolecular network.By fluorescence microscopy and fluorescence points spectrophotometric meter observation and detected with fluorescence compound [Cu2I2N2C8H12]∞, [Cu2I2N2C8H12]∞ have stable yellow fluorescence, lambda ex(max) is 367 nm and lambda ex(max) is 537 nm. The ligand of Ligustrazine when excited at 316 nm, the maximum fluorescence emission wavelength was 341 nm. [Cu2I2N2C8H12]∞ fluorescence than Ligustrazine obviously red shifted, probably because of the conjugate system of the complexes increases and the ligand to metal charge transfer function.Through mixed the common metal ion solution and [Cu2I2N2C8H12]∞, detection with fluorescence changes. found [Cu2I2N2C8H12]∞ of Ag + is highly selective, because Ag + and with the iodine content in coordination, failure structure of [Cu2I2N2C8H12]∞. Concentration of Ag+ and [Cu2I2N2C8H12]∞ fluorescence quenching degree is significantly positive correlation, can be used as a fluorescent probe for qualitative and semi quantitative detection of Ag+.Through common organic solvents, organic solution and [Cu2I2N2C8H12]∞ mixed experiment, detected with dissolved and fluorescence changes. The complexes slightly soluble in tetrahydrofuran, benzene and carbon tetrachloride solution, the maximum fluorescence emission wavelength blue shift. Sulfur compounds with thiourea and thioacetamide can take reaction with [Cu2I2N2C8H12]∞, thiourea and thioacetamide concentrations and [Cu2I2N2C8H12]∞ fluorescence quenching degree exist significant correlation, [Cu2I2N2C8H12]∞ fluorescent probes can of thiourea and thioacetamide as qualitative detection and semi quantitative analysis.By fluorescence analysis and X-ray diffraction detection of thiourea and thioacetamide and [Cu2I2N2C8H12]∞ reactant fluorescence and X-ray diffraction pattern, respectively with the standard fingerprint comparison, thioacetamide and [Cu2I2N2C8H12]∞ reaction to obtain a small amount of Cu2 S black precipitate. Combined with molecular structure is postulated reaction mechanism of thiourea and thioacetamide S atom and [Cu2I2N2C8H12]∞ Cu(I) complex, destruction of the coordination structure of Cu(I) in [Cu2I2N2C8H12]∞, leading to fluorescence quenching.Production of [Cu2I2N2C8H12]∞ carbon paste electrode, cyclic voltammetry detection of [Cu2I2N2C8H12]∞ for the reduction of oxidation. [Cu2I2N2C8H12]∞ is not a reversible reduction oxidation. because with the Cu+ oxidation to Cu2+, with structures were destroyed, cannot be reduced to [Cu2I2N2C8H12]∞. Composition is not response for electrochemical luminescence.In order to increase the dissolution of [Cu2I2N2C8H12]∞, oxidation of Ligustrazine TMP-COOH and CuI coordination obtained with TMCP-CuI complexes. The complexes at 396 nm excitation, the maximum fluorescence emission wavelength of 504 nm, fluorescence weak.Compound matrine and CuI complexes. Using infrared spectroscopy and polycrystalline powder X-ray diffraction were characterized structure of the complexes, obtained matrine and CuI with standard diffraction patterns. By fluorescence microscopy and fluorescence analysis, the complex hair yellow fluorescence, there is maximum excitation in 367 nm, the maximum emission wavelength to 423 nm. The complex and common inorganic metal salts and organic compounds, only for Ag+ are highly selective and S-containing compounds thiourea and thioacetamide reaction. because of Ag+ and S atoms with atomic complexation and damage the structure of the complexes, the fluorescence disappeared. The complexes has potential applications of fluorescent probes.