A series of dinuclear complexes with molar ratios of cerium to lanthanum of 1:0, 1:1, 1:2, 1:4, 1:7, 1:9 and 0:1 was synthesized using 5-sulfosalicylic acid (SSA) as the first ligand and 1,10-phenanthroline (Phen) as the second ligand, recorded as Ce1−x La x (SSA)3Phen (x = 0, 0·5, 0·67, 0·8, 0·875, 0·9, 1), and the complexes were blended with tricellulose acetate (TCA) to obtain luminescent polymer materials. The compositions and structures of the rare earth complexes were determined through elemental analysis, energy-dispersive X-ray analysis, infrared spectroscopy and thermogravimetric analysis. Under the optimum excitation wavelengths, all dinuclear complexes emitting blue light displayed the characteristic emission of the cerium (Ce3+) ion. The fluorescence spectra showed that the 85:15 TCA/Ce0·2La0·8(SSA)3Phen composite showed the strongest fluorescence among all composites and the quantum efficiency was calculated as 30·6%. The introduction of the lanthanum (La3+) ion into the cerium ion complex can effectively reinforce the luminescence intensity of the complex and be favorable for retaining the excellent fluorescence in the TCA matrix. The 85:15 TCA/Ce0·2La0·8(SSA)3Phen composite possesses fine luminescence properties and thermal stability for potential usage as a blue fluorescent material.

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Based on the ability of oxidizability of trace manganese ( Ⅶ) can oxidize the I -into form I 3 -with the Media of hydrochloric acid solution, and the crystal violet can react with I 3 -to form of CV-I 3 ion association molecule. Thus a new resonance light scattering (RLS) method for the determination of trace manganese (Ⅶ) was developed. And the affecting factors of intensity of RLS and the optimum conditions of the reaction systems were investigated. The maximum RLS peak was located at 320 nm. The detection limit and the linear range of manganese (Ⅶ) were 1.79×10 -7 g·L -1 and 0～ 0.62µg·mL -1 , respectively. It can be operated conveniently at room temperature. The satisfactory results were achieved in employing this method into the determination of manganese (Ⅶ) in environmental water samples. The recovery of environmental water was 99.2%～ 100.4%. A pilot study on the mechanism of reaction was given.

Dysprosium (Dy) ternary complex was prepared using 5-sulfosalicylic acid (SSA) as the first ligand and 1,10-phenanthroline (Phen) as the second ligand, denoted as Dy(SSA)3Phen. The complex was blended with tri-cellulose acetate (TCA) via a cosolvent method to obtain polymer luminescent materials. The composition and structure of the rare-earth complex were characterized by means of elemental analysis, infrared (IR) spectra, and thermogravimetric analysis (TGA). The fluorescence spectra displayed this pure Dy(SSA)3Phen complex, and the TCA/Dy(SSA)3Phen composites all emit blue light. The (90/10) composite possesses fine luminescent properties with quantum yield of 33.5% and thermal stability for potential usage as blue fluorescent materials.