温和条件下CO2为原料电合成碳酸二甲酯

常温常压下, 研究了以CO₂和甲醇为原料电合成碳酸二甲酯的反应. 在四乙基溴化铵为支持电解质的乙腈溶液中, 通过恒电流电解得到了唯一的产物碳酸二甲酯. 为了优化电解条件, 分别考察了工作电极、电流密度、支持电解质、通电量以及电解前后加入甲醇顺序的不同等因素对该反应的影响. 以铜为工作电极, 石墨为对电极, 在17 mA•cm^－2的电流密度下恒电流电解, 当通过2 F•mol^－1的电量后, 碳酸二甲酯的产率可达74%, 大大高于文献报道值.     

Synthesis and Crystal Structure of a New Cadmium（ Ⅱ ） Polymer with One-dimensional Chain Structure： [Cd（5-hip）（phen）]n·nH2O （5-hip = 5-Hydroxyisophthalate,phen = 1,10-Phenanthroline）

A new metal-organic coordination polymer [Cd（5-hip）（phen）]n·nH2O 1 has been hydro- ermally synthesized and characterized by elemental analysis, IR, TG and single-crystal X-ray diffraction. The crystal of the complex crystallizes in monoclinic, space group P2/n with a = 8.8071（17）, b =12.386（2）, c = 16.981（3） A, β = 100.182（2）°, V = 1823.2（6） A^3, Mr=. 490.73, Dc =1.788 g/cm^3,μ（MoKa） = 1.240 mm^-1, F（000） = 976, Z= 4, the final R = 0.0458 and wR = 0.1373 for 2864 observed reflections （I 〉 2σ（I））. The Cd atoms are coordinated by two N atoms from the phen ligands and four O atoms from 5-hydroxyisophthalate ligands in a highly distorted octahedral geometry.     

高效液相色谱法测定水性涂料中的酚类防霉剂

建立了简便、准确的高效液相色谱法检测涂料样品中五氯苯酚(PCP)、四氯苯酚(TeCP)和邻苯基苯酚(OPP)。选用C18柱为分离柱,以甲醇-10 mmol/LNH4Ac为流动相进行梯度洗脱,二极管阵列检测器检测,检测波长为220 nm。在该色谱条件下,PCP、TeCP、OPP分析线性范围分别为0.02~200 mg/L,0.02~200 mg/L,0.04~200 mg/L;最低检测浓度分别为0.01、0.01、0.02 mg/L,分别相当于涂料中的质量分数为5.0×10-4%,5.0×10-4%,1.0×10-3%;方法加标回收率为96.6%~103.6%,相对标准偏差为0.98~4.3%(n=7)。本法能满足涂料中PCP、TeCP、OPP的分析测定。     

缢蛏线粒体DNA提取方法的比较

分离缢蛏肌肉组织,液氮磨碎后,用3种方法提取线粒体DNA,紫外分光光度法定量．用琼脂糖凝胶电泳和线粒体COI基因PCR扩增产物鉴定所提取的线粒体DNA．结果显示OD260／OD280均在1．69-1．85之间．高盐沉淀法提取的线粒体DNA量最多．     

B位掺杂GdCo1-xSrxO3的制备及其光催化活性

用柠檬酸络合法制备了钙钛矿型GdCo1-XSrXO3(X=0.00, 0.02, 0.04, 0.06, 0.08)复合氧化物, 通过XRD, TEM 等手段对所生成纳米晶的物相结构、微观形貌、颗粒大小等进行了表征. 结果表明, 所合成的颗粒为钙钛矿型纳米晶, 球形. 通过其对活性艳红 X-3B 降解对其光催化活性进行了研究, 实验结果表明在B 位掺杂 Sr2+ 后使GdCoO3 的光催化活性明显提高, 当X=0.06 时, 即GdCo0.94Sr0.06O3 的光催化活性最佳.     

Electrocarboxylation of Acetophenone to 2‐Hydroxy‐2‐phenylpropionic Acid in the Presence of CO2

Electrocarboxylation of acetophenone with CO₂ to obtain 2‐hydroxy‐2‐phenylpropionic acid was carried out in acetonitrile solution containing 0.1 mol·L^?1 tetraethylammonium bromide. Influences of the nature of the electrodes, the working potential, the passed charge and the concentration of acetophenone on the electrocarboxylation were studied. After optimizing the synthetic parameters, the maximal isolated yield reached 73.0% on Mg‐stainless steel couple electrodes under potentiostatic electrolysis until 2.2 F·mol^?1 of charge was passed at 25 °C. The reduction of acetophenone was studied by cyclic voltammetry and the mechanism has been proposed on the basis of the results.     

树枝状大分子聚酰胺-胺的荧光特性

聚酰胺-胺( PAMAM) 树形大分子是近年来得到迅速发展的一类新型聚合物,其独特结构、功能化和应用价值引起了化学家们的极大研究兴趣.并在多个领域显示出良好的应用前景.近来又发现(PAMAM)在适当的pH值条件下发射较强的荧光,本文主要介绍了PAMAM对荧光物质的增强作用,PAMAM作为模板制备纳米粒子中的荧光效应,以及PAMAM自身荧光的发现及对其荧光机理的研究,并对PAMAM的荧光应用进行了展望.PAMAM 树型大分子由于具有良好的生物相容性、优异的能量转移机制等,有可能成为新型的生物荧光标记物.     

Synthesis, Crystal Structure and Electrochemistry of Two Complexes(YLn)3+[PW12O40]3-(L=Me2SO, Me2NCHO)

The reaction of a-H3[PWi2O40]with Y(NO3)3 in the presence of DMF or DMSO leads to two complexes complex 1 consists of discrete [YLn]3 cations and α-Keggin heteropolyanions [PW12O40]3-, whereas, in complex 2,donor-acceptor interaction results in a cation-anion-cation triplet. In addition, the electrochemical behavior of the two complexes indicates the usual successive reduction processes of the W atoms in the anions.     

2，3-二氨基萘荧光光度法测定楚雄地区糖尿病患者发硒含量

采用2,3-二氨基萘荧光光度法测定了楚雄地区糖尿病患者发硒含量,选取糖尿病患者50例,健康人群30例进行测定。结果表明,楚雄地区糖尿病患者发样中硒含量总体平均值为（0．3052±0．1263）μg/g,健康人群发样中硒含量总体平均值为（0．3345±0．1512）μg/g,糖尿病患者发样中硒含量明显低于健康人群,差异有统计学意义。