Preparation and Properties of Rare Earth Complexes with 5-Phenyl Pyrazoline Dithioformate

Nine complexes of rare earths with 5 phenyl pyrazoline dithioformate, Na[RE(S 2CNC 9H 9 N) 4· x H 2O (RE=La～Dy, Y, except for Ce and Pm) were synthesized in dry N 2 atmosphere and characterized by elemental analyses, molar conductance, IR spectra, thermal analyses. The results show that the ligands coordinate to the RE ion through two sulphur atom donors. Thermal analyses indicate that the thermal stability of the complex is not higher than that of sodium 5 phenyl pyrazoline dithioformate. The complexes are easily soluble in acetonitrile and tetrahydrofuran. The molar conductance values of the complexes measured in acetonitrile (1 24～1 32×10 -3 mol·dm -3 ) at 25 ℃ are in the range of 86～104 Ω -1 ·cm 2·mol -1 , indicating that they are 1∶1 electrolytes.

Preparation of Perovskite-Type Oxides La_(1-x)Sr_xFe_(1-y)Co_yO_3 Using EDTA Sol-Gel Method

Two series of perovskite-type oxides with composition (La_(1-x))Sr_xFeO_3(x≤0.8)and La_(1-x)Sr_xFe_(1-y)Co_yO_3(x=0.2; y=0.2, 0.4)powder productions were synthesized by EDTA complexing sol-gel method. The products were characterized by XRD, TEM, SEM, BET method(N_2 adsorption)and laser granularity analysis for different synthesis conditions to obtain the optimum conditions for the preparation process. Single-phased, uniform perovskite-type oxides with small particle size were obtained by EDTA sol-gel process with high stability and repeatability, and the process temperature is much lower than that of solid state reaction method.

稀土制剂对感染性皮肤病的疗效观察

通过临床试用 RDD-1型稀土制剂对脓疱疮、虫咬皮炎、多发性疖疮等174病例的疗效观察,说明该制剂县有一定杀菌消炎作用,对由细菌感染引起的浅表性皮肤病具有一定疗效。在174病例中痊愈85例、有效64例、无效26例,总有效率为85.1%。与白霉素制剂比较无明显差异。这种稀土制剂副作用小,无明显不良反应,使用时间短,一般在5～7天便可见效,可作为浅表性感染性皮肤病的外用药物。