端视式全谱直读电感耦合等离子体发射光谱法测定高纯氧化镧中稀土杂质

电感耦合等离子体发射光谱(ICP-AES)测定高纯氧化镧中14个稀土元素杂质,镧对其它稀土元素的光谱干扰比较严重,要求光谱仪单色器有较高的分辨率。使用端视式全谱直读ICP-AES仪,选择测定波长,工作参数优化,讨论了镧和酸度的影响。大部分稀土元素测定使用曲线拟合(FACT)的背景校正方法。该方法的稀土元素氧化物检出限达到3×10-4~0.022 mg.L-1(3σ)。     

Synthesis, crystal structure and studies on properties of trisodium 5,3′,5′-trisulfonate-2,3,4,4′-tetrahydroxy-deoxybenzoin

A new water soluble compound trisodium 5,3′,5′-trisulfonate-2,3,4,4′-tetrahydroxy-deoxybenzoin (TTDB) was synthesized and characterized by IR, UV, ¹H NMR, and elemental analysis. The single crystal of TTDB was determined by X-ray single crystal diffraction. The scavenging effect of compounds on hydroxy radicals was detected by fluorescent spectrophotometry. The electrochemical behavior of compounds in nonaqueous solution DMF was carried out by means of cyclic voltammetry. The experimental result shows that the crystal [C₁₄H₁₇Na₃O₁₈S₃] belongs to monoclinic, space group C2/c with unit cell constants a = 1.4223(4) nm, b = 2.4327(8) nm, c = 1.3596(4) nm, α = 90°, β = 113.044(5)°, γ = 90°, Z = 8, V = 4.329(2) nm³, D _c = 1.925 mg/m³, F(000) = 2568, F _w = 638.43, R ₁ = 0.0950, wR ₂ = 0.2648. The half effective concentration EC₅₀ of scavenging hydroxy radicals of compound THDB is 53.1 μmol/L, while that of scavenging hydroxy radicals of compound TTDB is 47.3μmol/L. The electrochemistry redox processes of THDB and TTDB are different from each other. __________ Translated from Chemical Journal of Chinese Universities, 2005, 26(9) (in Chinese)     

聚苯撑的合成、性能及其应用

对直链型、树枝形聚苯撑的合成、性能及其应用作了介绍，并着重描述了聚苯撑的应用。     

Mixed-valent diruthenium diphosphonate with kagomé structure

This paper reports the first example of diruthenium phosphonate with kagomé structure, namely, [NH3(CH2)4NH3][Ru2(hedpH(0.5))2].2H2O (hedp = 1-hydroxyethylidenediphosphonate). The compound contains kagomé layers that are linked by very strong hydrogen bonds into a nanoscale kagomé structure. Ferromagnetic interactions are mediated between the paramagnetic diruthenium units.     

流动注射—化学发光法测定苯甲醛

依据苯甲醛增强没食子酸－过氧化氢－氢氧化钠体系化学发光的性质，建立了苯甲醛的流动注射化学发光分析法。     

微分倒数示波计时电位法的研究—定量测试及滴定分析

首次利用微分倒数示波图定量测试微量金属离子并滴定分析药物，结果满意。     

Pushing up the size limit of chalcogenide supertetrahedral clusters: two- and three-dimensional photoluminescent open frameworks from (Cu(5)In(30)S(54))(13-) clusters

Direct band gap copper indium chalcogenides are of great technological importance in part because of their high photovoltaic conversion efficiency. Covalent superlattices constructed from copper indium chalcogenide clusters are of particular interest because they may combine open framework architecture with semiconducting properties. Here two photoluminescent covalent superlattices built from core-shell type copper indium sulfide supertetrahedral clusters are reported. Each cluster consists of 35 metal cations and is so far the largest known supertetrahedral cluster with a metal-to-metal distance of 1.6 nm. In addition, this is the first example of supertetrahedral clusters in heterometallic copper indium chalcogenides. The preparation of these large clusters has narrowed down the size gap between colloidal nanoclusters and small supertetrahedral clusters and revealed new possibilities in the construction of nanoporous semiconducting superlattices with tunable pore size. Through the combination of metal ions with different oxidation states to provide both overall and local charge neutrality, an effective approach has been demonstrated in the rational synthesis of chalcogenide open framework materials with large and unprecedented supertetrahedral clusters.     

聚合硫酸铁絮凝剂碱度的测定

聚合硫酸铁(PFS)是一种新型高效无机高分子絮凝剂,近年来在生产、生活用水和废水处理上得到日益广泛的应用。PFS的主要成分为碱式硫酸铁的聚合物,化学式可表示为[Fe_2(OH)_n(SO_4)_(3-n/2)]m,其中,n<2,m>10.分子式中的羟基为分子聚合提供氢键,并使PFS具有宽广的pH应用范围。因此,碱度是聚合硫酸铁絮凝剂生产和使用的一个重     

MnOx在ZrO2上分散状态及对CO氧化的影响

近年，氧化铝载体以其独特性能引起多方面的关注［1］．当将Pt、Rh金属担载在ZrO2上时，在金属和氧化物之间存在着强的相互作用［2，3］，从而提高了CO氧化和NO的还原性能．目前，许多作者曾对ZrO2。负载氧化铜催化剂进行了较系统的研究[4，5]：氧化锰对许多重要的催化反应有广