Li Hua Wang

The Research on Infrared and Luminescent Spectra of a New Mg (II) Luminescent Materials

In order to prepare the highlight luminescent material, we synthesized a highlight blue luminescent material, salicylaldehyde-4, 4’-diaminodiphenylsulfone Mg (II), by the reaction of Magnesium chloride hexahydrate with salicylaldehyde-4, 4’-diaminodiphenylsulfone. The results indicate that the maximum fluorescence emissions of Mg (II) complex material are at 459 nm (in solid), 466 nm (in DMSO), 476 nm (in CH3OH) and 464 nm (in CH3CH2OH), respectively. The Mg (II) material exhibits the strongest fluorescence in solid than that in DMSO, CH3OH and CH3CH2OH solution.

Study on the Luminescent Properties of Europium (III) Complex with 2, 3-Pyrazinedicarboxylic Acid

Two new europium (III) complexes luminescent materials, Eu-PDA and Eu-PDA-Phen, were prepared by the reaction of Eu(NO3)3·6H2O with 2, 3-pyrazinedicarboxylic acid (PDA) and 1,10-phenanthroline, respectively. The luminescent properties of two europium (III) complexes in solid and in organic solvents have been studied. The effect of organic solvents and metal ions (Ca2+ and Mg2+) on the luminescent intensity of the Eu (III) complexes have also been investigated. The results show that the metal ions (Ca2+ and Mg2+) could enhance the luminescent intensity of Eu-PDA-Phen complex and reduce luminescent intensity of Eu-PDA complex. The polarity of organic solvents is an important factor on the luminescent intensity of two complexes.

Synthesis, Spectral Properties of Di-(2-methyl-8-hydroxyquinoline)Zinc

The complex of di-(2-methyl-8-hydroxyquinoline) zinc (Zn (2-mq)2) was synthesized. The complex was characterized by elemental analysis, 1HNMR, 13CNMR, infrared, UV-vis, XRD and molar conductivity. The zinc (II) ion was found to coordinate to the oxygen atom of phenolic hydroxyl and nitrogen atoms of 2-methyl-8-hydroxyquinoline and the complex conformes to 1:2 metal-to-ligand stoichiometry. The fluorescence properties of the complex in solid and solution were studied. The complex exhibits yellow light under the excitation of UV light. The solvent factors influencing the fluorescent intensity are discussed.

Study on Crystal Structure and Thermal Stability of Hexaaquanickel (II) Bis[4-amino-3-methyl-benzenesulfonate]

Light green crystals of the Ni (II) complex material, [Ni(H2O)6](C14H16N2O6S2), were obtained by the self-assembly of Ni(H2O)6·6H2O, 4-amino-3-methyl-benzenesulfonic acid and NaOH. The result of X-ray diffraction shows that each Ni (II) atom is six-coordinated in a distorted octahedral environment by six oxygen atoms from the water molecules. The complex molecules are connected by hydrogen bonds to form two dimensional network structure. The thermal analysis shows that the complex has a enothermic peak at 302 C, indicating that coordinated water molecules are in the complex.

Fluorescent Properties of Mg (II) Complex with 1-Acetyl-2-Naphthol-4, 4’-Diaminodiphenylmethane

A mono-ligand neutral Mg (II) complex of a Schiff base ligand derived from 1-acetyl-2-naphthol and 4, 4’-diaminodiphenylmethane was prepared and characterized. The Schiff base acts as a double, negatively charged quadridentate ligand forming stable neutral Mg (II) complex. The luminescent characterizations of the Mg (II) complex material in solid and in organic solvents show that the Mg (II) complex has strong luminescent emission at ca. 452 nm when excited at 323 nm. The Mg (II) complex synthesized may be an excellent luminescent material.

Hydrothermal Synthesis and Luminescent Characterization of Zn (II) Complex with 1,4-Bis(2’-formylphenyl)-1,4-dioxabutane Isonicotinoylhydrazone

A aroylhydrazone Schiff-base ligand (1, 4-Bis(2’-formylphenyl)-1,4-dioxabutane isonicotinoylhydrazone) and its Zn (II) complex were synthesized by hydrothermal method. The ligand was characterized by IR spectrum, MS spectrum and X-ray single crystal diffraction analysis. The luminescent properties of the ligand and Zn (II) complex material have been investigated in solid and in organic solvents. The results show that the ligand has strong luminescent emission at ca. 454 nm and the fluorescence of Zn (II) complex is very weak.

Synthesis and Photoluminescent Properties of 1-Acetyl-2-naphthol -4, 4’-diaminodiphenylmethane and its Cd (II) Complex

A Cd (II) complex with Schiff base ligand, 1-acetyl-2-naphthol-4, 4’-diaminodiphenylmethane (L), has been prepared. The photoluminescent properties of ligand and its Cd (II) complex have been investigated. The results show that the ligand and Cd (II) complex have stronger fluorescence in DMSO, however, their fluorescence are very weak in solid, in methanol and in ethanol, indicating that DMSO solvent could enhance the fluorescence of ligand and its Cd (II) complex. The Cd (II) complex is stable either in air or in organic solvents.

One-Pot Synthesis and Luminescent Properties of Mg (II) Complex Material with 5-Bromosalicylaldehyde- 4,4’-Diaminodiphenylamine

Using 5-bromosalicylaldehyde, 4, 4’-Diaminodiphenylamine and MgCl2•6H2O as starting materials, a new Mg (II) complex material was synthesized. This method is a convenient and efficient way to the synthesis of Mg (II) complex materials. The luminescent properties of the Mg (II) complex material were studied in solid state and in organic solvents. The effect of organic solvents and three carboxylate derivatives on the luminescent properties are also investigated. The results show that the Mg (II) complex material emits light green fluorescence 550 nm when excited at 328 nm at room temperature.

Preparation, Spectral Characterization and Fluorescence Property of Schiffbase Mg(II) Complex Material

The reaction of 1-(1-hydroxy-2-naphthalenyl)-N, N-bis(3-aminopropyl)methylamine with MgCl2•6H2O in CH3CH2OH followed by recrystallization in CH3CH2OH gave rise to colorless block Mg (II) complex crystal material. The Mg (II) complex has been characterized by elemental analysis, IR spectra and molar conductivity. The photoluminescence of the Mg (II) complex material was tested in solid and in solution, the result shows that the complex displays a emission maximum in blue region and that the organic solvents have effect on fluorescence intensity of Mg (II) complex.

Research on the Effect of Mg (II) Ion Concentration on the Luminescent Intensity of Tb Complex

The effect of different concentrations of Mg (II) ion on luminescent intensity of Tb (III) complex material in ethanol, methanol and DMSO solutions has been studied. The results show that the quenching effect of organic solvents for the luminescence of Tb (III) complex material was in the order DMSO>methanol>ethanol. The Mg (II) ion of different concentrations has obvious quenching effect to luminescent emission of Tb (III) complex material in organic solvent. And the quenching effect of 0.2 mol/L Mg (II) ion is weakest. And the quenching effect of 0.8 mol/L Mg (II) ions is strongest.