Synthesis and Crystal Structures of Novel Keggin and Dawson Polyoxometalates Containing Amantadine

Heteropolyoxometalates are a large family of potent medicines due to their excellent antiviral and antitumor activity 1-4, while their application in clinic meets great difficulties for their toxicity 5. How to synthesize heteropolyoxometalate medicines possessing high activity and low toxicity has become the focus in heteropolyoxometalate medicine research. Previously reported polyoxometalates showing medical activities are all salts simple Na+, K+ or NH4+ etc. inorganic cations, in which o…     

SDS及其与十二烷基三乙基溴化铵混合体系在矿化水中的表面活性

测定了十二烷基硫酸钠(SDS)、十二烷基三乙基溴化铵(DTEAB)单一体系及不同摩尔比的混合体系在矿化水溶液中的表面活性,并与在纯水和NaCl水溶液中的表面活性作了比较．所得结果表明：(1)阴离子表面活性剂SDS在含Ca^2 ,Mg^2 等的矿化水中有比在纯水和NaCl水溶液中更好的表面活性．这一方面是由于矿化水中的Ca^2 ,Mg^2 对负电胶团和表面吸附层的强烈电性作用,另一方面在大量Na^ 存在时,钠钙盐混合表面活性剂Krafft点提高不多;(2)SDS和DTEAB混合物在矿化水中具有很强的增效作用,其表面活性的变化规律与在纯水和NaCl水溶液中基本相同,表明阴阳离子表面活性剂混合体系具有优异的抗矿化水性能．这些结果可用阴、阳表面活性离子的电性作用解释．     

Formation of α,α''''-Bis(substituted benzylidene)cycloalkanones from Masked Aldehydes Promoted by Samarium(III) Triiodide

~~Formation of α,α'-Bis(substituted benzylidene)cycloalkanones from Masked Aldehydes Promoted by Samarium(III) Triiodide~~     

四元配合物[Nd(C_4H_3OCOO)_2·NO_3·C_(10)H_8N_2]_2的合成与晶体结构

稀土羧酸配合物在萃取分离、杀菌、催化和发光材料等方面有广泛的应用[1]。将氮杂环双齿配位体引入到这类配合物中可增强配合物的共轭作用,提高稳定性并增强其杀菌能力和发光性质[2]。虽然氮杂环双齿配位体邻菲咯啉的稀土羧酸配合物报道较多,但含2,2′联吡啶配位的稀土羧酸配合物的研究相对较少,尤其是含2,2′联吡啶的四元稀土羧酸混配配合物的研究更为少见[3]。2呋喃甲酸是糠醛在人体中的代谢产物,可做为防腐剂、熏蒸剂等,本文报道[Nd(C4H3OCOO)2·NO3·C10H8N2]2配合物的合成和单晶X射线衍射分析结果。2呋喃甲酸(分析纯)、2,2′联吡…     

氨基修饰聚苯乙烯树脂对酚酸物质的吸附性能

通过对XAD 4聚苯乙烯树脂的氨基修饰制备了一种亲水性的NDA 10 0树脂 .研究了NDA 10 0树脂对苯酚和对羟基苯甲酸等酚酸类物质的吸附动力学和热力学行为 .结果表明 ,NDA 10 0树脂对苯酚和对羟基苯甲酸具有良好的吸附性能 ,在研究的浓度范围内 ,吸附平衡数据符合Langmuir和Freundlich等温吸附方程 ,吸附为放热的物理吸附过程 .吸附动力学符合Lagergren准二级速率方程 ,颗粒内扩散为吸附速率的主要控制步骤 .     

Zn:Er:LiNbO3单晶的坩埚下降法生长及光谱特性

报道了ZnErLiNbO3单晶的坩埚下降法生长工艺. 通过控制晶体生长固液界面的温度梯度(30～35 ℃·cm-1)、晶体的生长速度(0.8～1.5 mm·h-1)、密闭Pt坩埚等条件生长了宏观无缺陷的Zn2+(3%)和Er3+(0.6%)共掺的LiNbO3单晶. 用X射线衍射(XRD)和差热分析(DTA)表征了获得的晶体, 并测量了晶体不同部位的吸收光谱和荧光谱. 从吸收光谱以及由XRD数据计算所得的晶胞参数推断, 沿生长方向Er3+在晶体中的浓度分布逐步减少. 光谱数据表明, 晶体底部样品的吸收强度和荧光强度要比顶部大, 而对应于Er3+上能级4S3/2和2H11/2跃迁至基态4I15/2的绿光发射, 晶体底部却比顶部表现出更高的上转换效率. 从晶体的内部结构、缺陷情况以及Er3+的分凝现象解释了产生上述现象的内在机制.     

Zn∶Er∶LiNbO_3单晶的坩埚下降法生长及光谱特性

报道了Zn∶Er∶LiNbO3单晶的坩埚下降法生长工艺。通过控制晶体生长固液界面的温度梯度(30~35℃.cm-1)、晶体的生长速度(0.8~1.5 mm.h-1)、密闭Pt坩埚等条件生长了宏观无缺陷的Zn2+(3%)和Er3+(0.6%)共掺的LiNbO3单晶。用X射线衍射(XRD)和差热分析(DTA)表征了获得的晶体,并测量了晶体不同部位的吸收光谱和荧光谱。从吸收光谱以及由XRD数据计算所得的晶胞参数推断,沿生长方向Er3+在晶体中的浓度分布逐步减少。光谱数据表明,晶体底部样品的吸收强度和荧光强度要比顶部大,而对应于Er3+上能级4S3/2和2H11/2跃迁至基态4I15/2的绿光发射,晶体底部却比顶部表现出更高的上转换效率。从晶体的内部结构、缺陷情况以及Er3+的分凝现象解释了产生上述现象的内在机制。     

两个含有平行交替链的新型二氰胺配位高聚物: {Mn(dmpz)[N(CN)2]2}2和{Cu(dmpz)[N(CN)2]2}2

Two new dicyanamide coordination polymers, {Mn(dmpz)[N(CN)2]2}2 (1) and {Cu(dmpz)[N(CN)2]2}2 (2)(dmpz=3,5-dimethylpyrazole), were synthesized and characterized by single crystal X-ray diffraction analysis and IR spectroscopy. In 1 and 2 the metal ions have two different coordination modes, where one is coordinated to four dicyanamide anions and two monodentate dmpz molecules to form a slightly distorted octahedral geometry, while the other adopts octahedral geometry, surrounded by four nitrile N atoms and two amide N atoms of the dicyanamide anions. Both complexes contain two alternating chains that are parallel to each other.     

Electrochemical characteristics of a platinum electrode modified with a matrix of polyvinyl butyral and colloidal Ag containing immobilized horseradish peroxidase

A new hydrogen peroxide biosensor was constructed, which consisted of a platinum electrode modified by a matrix of polyvinyl butyral (PVB) and nanometer-sized Ag colloid containing immobilized horseradish peroxidase (HRP), and using Co(bpy)₃³⁺ as mediator in the hydrogen peroxide solution. The electrochemical characteristics of the biosensor were studied by cyclic voltammetry and chronoamperometry. The modified process was characterized by electrochemical impedance spectroscopy and cyclic voltammetry. The HRP immobilized on colloidal Ag was stable and retained its biological activity. The sensor displays excellent electrocatalytic response to the reduction of H₂O₂. Analytical parameters such as pH and temperature were also studied. Linear calibration for H₂O₂ was obtained in the range of 1×10^–5 to 1×10^–2 M under optimized conditions. The sensor was highly sensitive to H₂O₂, with a detection limit of 2×10^–6 M, and the sensor achieved 95% of steady-state current within 10 s. The sensor exhibited high sensitivity, selectivity and stability.     

反相高效液相色谱法测定肾复康胶囊中的野黄芩苷和芦丁

建立了肾复康胶囊中野黄芩苷和芦丁的反相高效液相色谱测定方法。以甲醇-水为提取溶剂,采用超声提取法对样品进行前处理。以0.02 mol/L磷酸二氢钾缓冲溶液(含1.0％（体积分数）冰醋酸)-甲醇（体积比为63∶37）为流动相,于330 nm波长下检测,肾复康提取液中野黄芩苷和芦丁可达基线分离,分析时间在20 min内。野黄芩苷和芦丁在10 ~300 mg/L内,其峰面积与浓度之间线性关系良好,目标物的加标回收率大于98％。该方法适用于肾复康胶囊及相关药材中野黄芩苷和芦丁黄酮类化合物的测定和质量控制。