核磁共振法研究DTPA-BIN稀土配合物的溶液结构

用核磁共振方法研究了抗磁稀土配合物Ln(DTPA-BIN)(Ln=La,Y,Lu,Sc）的水溶液结构。^1H和^13C NMR谱的谱形特征表明,每一种配合物在水溶液中存在着两种以上不对称的异构体,异构体之间的差别较小。并由Y^3 与Gd^3 离子半径的相似性推测出Gd(DTPA-BIN）的溶液结构。即DTPA－BIN分子提供8个配位点：3个骨架氮、3个乙羧基氧及2个酰胺氧,1个水分占据另一个配位点,从而与Gd^3 形成了九配位结构。溶液结构随中心金属离子半径不同而呈规律性变化。     

能使有机溶剂凝胶化的凝胶因子研究进展

较系统地综述了有机凝胶因子的种类及其在有机溶剂中聚集与自我组装,形成有机凝胶的研究进展。     

离子色谱荧光检测法测定废水中痕量2-氨基联苯和4-氨基联苯

采用离子色谱荧光检测法测定废水中的2－氨基联苯（2－ADP）和4－氨基联苯（4－ADP）,流动相为1．0mL/min的0．06mol/L NaCl,0.08mol/L HCl,40%(V/V)ACN,分离柱为Dinoex OmniPac PCX-500,该法具有良好的重现性和线性关系,2－ADP和4－ADP的回收率分别为98．5％－101．4％和102．2％－104．0％,检测限分别为0．006mg/L和0．10mg/L。     

2-(2,3,5-三氮唑偶氮)-1,8-二羟基-3,6-萘二磺酸与铜的显色反应及其应用

研究了新的水溶性显色剂2-(2,3,5-三氮唑偶氮)-1,8-二羟基-3,6-萘二磺酸与铜的显色反应,并利用该显色反应建立了测定铜的新方法。在pH=5.52的HAc-NaAc缓冲液中,该试剂与铜形成蓝绿色稳定络合物,λ_(max)为550.8nm,表观摩尔吸光系数为2.44×10~4L/(mol·cm),铜的浓度在0.0～1.0μg/mL范围内符合比耳定律。其他金属离子共存时,不经预分离也无需加掩蔽剂,可直接测定食品及环境水样中的微量铜,操作简便,结果准确。     

DESIGN AND PHOTOFUNCTIONS OF DENDRIMER-ENCAPSULATED POLY(PHENYLENEETHYNYLENE)S

A series of dendrimer-encapsulated poly(phenyleneethynylene)s 4～6 were Synthesize d. The light-harvesting antenna functions of dendrimer frameworks together with the blue-light emitting activities of 4～6 were highlighted.     

Maleic acid-styrene encapsulated silica cation exchanger in high performance liquid chromatography

The use of poly(maleic acid–styrene)-encapsulated silica for the determination of monovalent and divalent cations is well accepted in ion chromatography. The separation of Mn²⁺, alkali and alkaline earth metal cations is obtained under the same chromatographic conditions. The influences of pH and the concentration of eluent on the retention of cations have been studied. The preparation conditions of packings were studied. The metal ions in the boiler water samples from a thermal power plant were quantitatively determined using this column. The results are in agreement with those determined by ICP and Volumetric analysis methods.     

Complexation of trivalent lanthanide cations by inositol in solid state. The crystal structure and Raman spectra study of NdCl3·inositol·9H2O

The crystal structure of NdCl₃·C₆H₁₂O₆·9H₂O has been determined. It crystallizes in the monoclinic system, p2(1)/n space group with cell dimensions: a=15.824(3) Å, b=8.633(2) Å, c=16.219(3) Å, β=107.24°, V=2116.1(7) ų and Z=4. Each Nd ion is coordinated to nine oxygen atoms, two from inositol and seven from water molecules, with an Nd–O distance of 2.449–2.683 Å, the other two water molecules are hydrogen bonded. No direct contacts exist between Nd and Cl. There is an extensive network of hydrogen bonds in hydroxyl groups, water molecules and chloride ions in the crystal structure of the lanthanide complex. The Raman spectra of Pr–, Nd– and Sm–inositol are similar, which show that the three metal ions have the same coordination mode. The Raman spectra are consistent with their structures.     

In-situ separation of the matrix for the direct determination of traces of chromium, cobalt, and nickel in titanium dioxide powder by electrothermal atomic-absorption spectrometry with slurry sampling

A novel method has been developed for the direct determination of traces of chromium, cobalt, and nickel in TiO2 powder; it entails slurry sampling and electrothermal atomic-absorption spectrometry (ETAAS) with a polytetrafluoroethylene (PTFE) slurry (6% m/v) as fluorinating reagent. The factors which could affect the vaporization of the matrix and analytes were studied in detail; the fluorinating vaporization behavior of the analyte both in the slurry and in solution were also investigated. Owing to the in-situ separation of the matrix, the matrix influences were reduced significantly. The proposed method has been applied to the direct determination of traces of chromium, cobalt, and nickel in high-purity TiO2 powder without chemical pretreatment. Under the optimum experimental conditions the detection limits of the analytes (Cr, Co, and Ni) were 1.9 ng g(-1), 2.4 ng g(-1) and 5.4 ng g(-1), respectively, the relative standard deviations (RSD) were 3.4% (n=6, c=7.0 ng mL(-1)), 2.9% (n=6, c=0.70 ng mL(-1)), and 7.6% (n=6, c=4.0 ng mL(-1)), again respectively, and the characteristic masses for Cr, Co, and Ni were 8.4 pg/ 0.0044A, 9.3 pg/0.0044A, and 40.0 pg/0.0044A, respectively.     

锆氢化反应热力学函数的计算

用B3LYP/SDD密度泛函方法计算了ZrH的微观性质,气态ZrH(D,T)的能量(E),熵(S)以及 Zr与氢同位素气体反应的热力学函数.在ZrH(s)、ZrD(s)和ZrT(s)的E和S的计算中,近似以分 子总能量中的振动能Ev代替固态能量,以电子和振动熵SEv代替固态熵.在这种近似下,计算了 不同温度下Zr与H2、D2、T2反应的ΔH、ΔG、ΔS及氢化反应平衡压力,导出了与温度 的依赖关系.计算结果表明,ZrH(s)的生成热为161.34 kJ穖ol-1,与实验值(173.5 kJ穖ol -1)接近,表明这种近似处理方法是合理的,可以用于研究贮氢材料氢化反应的热力学.     

二氧化硅纳米粒子薄膜的制备及光学性能

以二氧化硅胶体和聚二烯丙基二甲基氯化铵(PDDA)为原料,利用静电自组装技术制备了PDDA/SiO2复合薄膜. TEM图象显示,薄膜中的SiO2纳米粒子为密堆积,薄膜均匀、致密;电子衍射实验结果显示,所组装的薄膜为非晶态膜.载玻片表面组装SiO2纳米粒子薄膜后,透射率随薄膜双层数增加呈现周期变化.薄膜具有增透作用,载玻片双面组装薄膜后在一定波长范围内的透射率可提高5％以上. PDDA/SiO2复合薄膜的光学性质主要由SiO2纳米粒子决定,每一双层的平均物理厚度小于SiO2纳米粒子的粒径,薄膜中存在层间穿插现象,逐层组装的复合薄膜具有单层光学薄膜的特性.