Determination of Size Distribution of Nano-particles by Capillary Zone Electrophoresis

A new method was developed for the determination of the size distribution of nano-particles by capillary zone electrophoresis (CZE). Scattering effect of nanoparticles was studied. This method for the determination of size distribution was statistical.     

Preparation ,Structural Characterization and Luminescent Property of Binucleasr Silver（Ⅰ）Complex Formed by Benzotriazole and 1—Hydroxymethyl Benzotriazole

Dinuclear silver (I) six‐membered ring complex [Ag₂ (bta)₂ ‐(hmbta)₂] (ClO₄)₂ (3) has been synthesized by the reaction of benzotriazole (bta) (1) and 1‐hydroxymethyl benzotriazole (hmbta) (2) with Ag (CH₃CN)₄ClO₄. The structures of compound 2 and Complex 3 have been studied by single crystal X‐ray diffraction analysis. The change of luminescent intensity of 1, 2 and 3 was reported. Compound 2 crystallizes in the monoclinic system with space group P2 (1)/c, a = 0.7655 (10) nm, b = 1.0126 (14) nm, c =0.9502 (13) nm, β = 95.07 (2)°, V = 0.7337 (17) nm³ and Z = 4. Complex 3 crystallizes in the triclinic system with space group P1, a = 0.73611 (18) nm, b = 0.9152 (2) nm, c = 1.2277 (3) nm, β = 87.170 (5)°, V = 0.8221 (3) nm³ and Z = 1. The main structural feature of complex 3 is a symmetric dinuclear six‐membered ring formed by two silver (I) atoms and four N‐atoms from two benzotriazoles. The second structural feature of complex 3 is the τ‐τ stacking interaction between two adjacent molecular planes, which forms the two‐dimentional layer structure. Besides, compared with 2, the luminescent intensity of complex 3 shows a remarkable enhancement.     

Syntheses and Crystal Structures of 4,4‘—Diformyl—diphenoxyethane and 4,4’,4‘’—Triformyl—triphenoxytriethylamine

Two title compounds, 4,4'-diformyl-diphenoxyethane (compound 1, C16H14O4)and 4,4',4'-triformyl-triphenoxytriethylamine (compound 2, C27H27NO6), were synthesized by condensation of 4-hydroxybenzaldehyde with 1,2-dichloroethane and tris2-chloroethylamine, respectively in dimethyl formamide in the presence of anhydrous potassium carbonate. The crystal data are: monoclinic, P21/c, a = 7.571(2), b = 12.608(3), c = 7.357(2) ', = 105.823(6)o, V = 675.7(2)'3, Mr = 270.3, Z = 2, Dc = 1.328 g/cm3, F(000) = 284, (MoK = 0.096 mm-1, R = 0.0537 and wR = 0.2189 for compound 1; and monoclinic, P21/n, a = 11.7162(6), b = 9.0042(6), c = 22.908(2) ', = 99.505(1)°, V = 2383.5(3) '3, Mr = 461.50, Z = 4, Dc = 1.286 g/cm3, F(000)= 976, (MoK = 0.091 mm-1, R = 0.0464 and wR = 0.1462 for compound 2. The molecule of compound 1 dialdehyde is located at the crystallographic inversion center nearby the midpoint of C8-C8A single bond. The three chains in the molecule of compound 2 trialdehyde are of non-crystallographic pseudo-C3 symmetry, and each of them is quite planar.     

Synthesis and Crystal Structure of Mo(CO)_4(NNP) (NNP=2-(N-Cyclohexyl-N-diphenylphosphinomethyl)aminopyridine)

1 INTRODUCTION The pyridyl-phosphine ligands have been widely used for many years to synthesize hetero- or homo-nuclear metal complexes[1], as electronic differentiation associated with the hard (N) and soft (P) donor atoms dictates their unique reactivities and coordination modes. One of the most common pyridylphosphines studied to date is (2-C5H4N)PPh2 which displays numerous ligating modes ranging from P-coordination and P,N-chelation to the more common P,N-bridging of two metal …     

用新型AP树脂分离铑—铱和同时富集测定铑`铱`铂`钯

铑-铱分离-向被认为是最困难的课题之一,即使文献曾报道Rh-Ir的分离,但实际Rh并未与萃取剂或吸附剂反应,而是与非贵金属离子一同留在溶液中。我们曾用光谱半定量方法研究了AP树脂对Rh、Ir的吸附行为,结果是Rh不被吸附而Ir能被吸附。本文通过改变Rh的离子状态,使之能被AP树脂吸附完全,而与留在溶液中的非贵金属分离,然后在柱上用不同淋洗液再使Rh-Ir分离。     

Al(Fe)-o-NPF-CTMAB-乳化剂OP显色体系的研究和应用

研究了在阳离子表面活性剂CTMAB和非离子表面活性剂OP所组成的混合表面活性剂存在下,Al、Fe与ο-NPF的显色反应。实验结果表明,在pH6.2—7.8的缓冲介质中,Al、Fe能与ο—NPF生成稳定的络合物,其最大吸收峰位于λ_(Al)=556nm、λ_(Fe)=610nm,摩你吸光系数为ε_(Al)=1.83×10~5、ε_(Fe)=1.62×10~5,具有较高的选择性,并用于立方氮化硼和氮化硅中Al、Fe的同时测定。     

超微粒子合成方法的发展动向

超微粒子是指粒径比光波还要短(100um以下),而性质介于本体物质和原子之间的物质。近年来,由于超微粒子在磁性、催化、烧结、光学等方面显示出独特性能,作为一类新型材料在许多领域中将得到广泛应用。国外已组织大批物理、化学工作者从事研究,使超微粒子的合成和机理探讨成为十分活跃的研究领域。本文对超微粒子合成方法的发展动向和应用作简     

铁-钼/活性炭催化剂的费-托合成反应性能

用微型固定床反应器和原位穆斯堡尔谱考察了在活性炭担载的铁-钼双金属催化剂上的费-托合成反应和在反应条件下的物相。已知在费-托合成中铁有利于生成长链烃,钼有利于生成低碳烃。铁-钼/活性炭催化剂则综合了铁和钼的性质,其中铁-钼/油棕炭催化剂具有很好的活性和液化石油气选择性。在反应中,富钼催化剂的主要物相为铁-钼碳化物,而富铁催化剂的物相则为铁-钼碳化物和e’-Fe_2·2C碳化铁。     

八—4—（四氢糖氧基）酞菁铕（Ⅲ）的双酞菁衍生物LB膜特性

合成了八-4-(四氢糠氧基)酞菁铕(Ⅲ)(A)、八-4-(正壬氧基)酞菁铽(Ⅲ)(B)、双酞菁铽(C)和八-4-硝基酞菁铽(D),通过元素分析、红外光谱、质谱和紫外-可见光谱加以确认.测定了配合物A的π-A曲线,表明有很好的成膜性,Z型沉积形成的石英LB膜具有很强的荧光响应,随着LB膜厚度增加,荧光强度增加.掺杂邻菲咯啉的混合LB膜荧光强度比纯膜强,但不是邻菲咯啉加入的量越多发光性越强.研究结果表明nA:nphen=1:10时有最好的荧光行为.同时研究了A和LB膜对于NH3,NOx(x=1,2)和Cl2的气敏性.当A和LB膜分别在NH3和NOx(x=1,2)为5×10-5时,未观察到响应.而Cl2气中,在2×10-6的情况下,迅速产生了响应.在低体积分数条件下(2×10-6～8×10-5),电导率随着Cl2体积分数的改变而呈直线变化.     

微波作用下2,5-二取代-1,3,4-噁二唑的合成

2 ,5 二取代 1 ,3 ,4 二唑可用作药品 ,光敏物质 ,闪烁体 ,激光材料 ,高分子液晶单体等[1- 5] 。一种是以芳香酸与水合肼作为原料用多聚磷酸作为脱水环合剂来合成此类化合物[6 ] ,另一种是由芳香酸转变为芳香酰氯或酯 ,再与水合肼反应得到单酰肼或二酰肼 ,最后用三氯氧磷[7] ,五氧化二磷和五氯化磷[8] ,一氯三甲硅[9] 脱水环合 ;此外 ,用水合肼和尿素合成得到的氨基脲代替水合肼 ,与芳香酸缩合合成二唑[10 ] ,这些方法共同的缺陷是 :环合时间较长 ,少者 4～ 5ｈ ,多则 8ｈ。近年来 ,微波技术在有机合成及其杂环化合物的合成中得到了广…