配合物[Co(qina)2(H2O)2]•2DMSO的晶体结构及其与DNA作用研究

合成了配合物[Co(qina)₂(H₂O)₂]•2DMSO单晶(qina为喹哪啶酸). 配合物属于单斜晶系, P2(1)/n空间群, 其分子结构为规则的八面体构型, qina以氮原子和羧酸根氧原子与Co^2＋离子配位, 两个水分子为轴向配位. 配合物之间富有配位水分子分别与DMSO的氧原子、qina中未与Co(II)配位的氧之间氢键作用. 配合物与鱼精DNA作用的紫外光谱和荧光光谱表明, 两者之间有一定的相互作用, 并可能以局部插入方式为主.     

Synthesis, Characterization and Thermal Decomposition Mechanism of Cetyltrimethyl Ammonium Tetrathiotungstate

The synthesis, characterization and thermal decomposition mechanism of cetyltrimethyl ammonium tetrathiotungstate （CTriMATT） were studied herein. The as-synthesized CTriMATT was characterized by Elemental analysis, X-ray diffraction （XRD）, Fourier transform infrared （FT-IR）, Ultraviolet visible （UV-Vis） spectra. The results showed that the as-synthesized CTriMATT had high purity and good crystallinity. The introduction of alkyl groups induced a shift of the stretching vibration band of W-S bond to lower wavenumber, while it had no influence on the position of WS4^2-. Thermogravimetric analysis （TG）, differential thermal analysis （DTA） and in situ XRD characterizations revealed that CTriMATT began to decompose at 423 K in nitrogen and was converted to WS2 eventually. In addition, the decomposition product of CTriMATT at 673 K in nitrogen was characterized by N2 adsorption （BET） and scanning electron microscopy （SEM）. The results demonstrated that WS2 with higher specific surface area, and pore volume could be obtained from the thermal decomposition of CTriMATT in nitrogen.     

A New Amperometric Biosensor Based on HRP/Nano-Au/L-Cysteine/Poly（o-Aminobenzoic acid）-Membrane-Modified Platinum Electrode for the Determination of Hydrogen Peroxide

The third generation amperometric biosensor for the determination of hydrogen peroxide （H2O2） has been described. For the fabrication of biosensor, o-aminobenzoic acid （oABA） was first electropolymerized on the surface of platinum （Pt） electrode as an electrostatic repulsion layer to reject interferences. Horseradish peroxidase （HRP） absorbed by nano-scaled particulate gold （nano-Au） was immobilized on the electrode modified with polymerized o-aminobenzoic acid （poABA） with L-cysteine as a linker to prepare a biosensor for the detection of H2O2. Amperometric detection of H2O2 was realized at a potential of ＋20 mV versus SCE. The resulting biosensor exhibited fast response, excellent reproducibility and sensibility, expanded linear range and low interferences. Temperature and pH dependence and stability of the sensor were investigated. The optimal sensor gave a linear response in the range of 2.99×10^-6 to 3.55×10^-3 mol·L^-1 to H2O2 with a sensibility of 0.0177 A·L^-1·mol^-1 and a detection limit （S/N = 3） of 4.3×10^-7 mol·L^-1. The biosensor demonstrated a 95% response within less than 10 s.     

三苯基锡壳聚糖黄原酸酯的合成、表征及其杀螺活性研究

壳聚糖(chitosan,简称 CTS)是由β(1～4)键合的D-葡糖胺残基和数目不同排列无规的N-乙酰基葡糖胺残基组成的线性多糖,是生物界中大量存在的唯一的一种碱性多糖.     

铵离子插层mos2的制备与表征

以剥层重堆法制备了NH 4/MoS2插层复合物,该复合物可以作为长期储存的单层MoS2,同时也可作为先驱体以便插入其它客体分子制成新的插层复合物.通过XRD、热重分析和元素分析等测试技术对该插层复合物进行了表征.结果表明,MoS2经NH 4插层后,其层间距由0.615nm增加到0.954nm,由元素分析和热重分析得出插层复合物的组成分别为(NH 4)3.1 MoS2 和(NH 4 )2.9 MoS2 . 插层复合物在空气中放置30 d后,其XRD和热重分析的结果表明该插层复合物的储存稳定性良好. 此外,插层复合物的插层程度受氯化铵溶液浓度、反应温度、反应时间等反应条件的影响,质量分数为1.0%的氯化铵溶液, 反应温度30 ℃和反应时间12 h,所得到的NH 4 /MoS2插层复合物层间距最大.     

焦脱镁叶绿酸-a甲酯20-meso-1-位的亲电取代反应

利用焦脱镁叶绿酸-a甲酯与亲电试剂发生的取代反应, 在焦脱镁叶绿酸-a甲酯的20-meso-位上分别引进硝基和卤原子, 得到了20-meso位取代的焦脱镁叶绿酸衍生物. 所合成的新叶绿素-a衍生物均经UV, IR, ¹H NMR及元素分析证明其结构. 另外, 对叶绿素-a卟吩环上的芳香性和相应的化学反应活性也进行了讨论, 提出了可能的亲电取代反应机理.     

Nonisothermal Kinetics of Dehydration Process of [Sm（m-CIBA）3phen]2·2H2O and [Sm（p-CIBA）3phen]2·2H2O

Compounds [Sm（m-CIBA）3phen]2.2H20 and [Sm（p-CIBA）3phen]2·2H20（m-CIBA=m-chlorobenzoate, pClBA=p-chlorobenzoate, phen=l,10-phenanthroline） were prepared. The dehydration processes and kinetics of these compounds were studied from the analysis of the DSC curves using a method of processing the data of thermal analysis kinetics. The Arrhenius equation for the dehydration process can be expressed as lnk=-38.65-243.90×l0^3/RT for [Sm（m-CIBA）3phen]2·2H2O, and lnk=38.70-172.22×103/RT for [Sm（p-CIBA）3phen]2·2H2O. The values of △H^1, △G^1, and △S^1 of dehydration reaction for the title comnonnds are determined respectively.     

铌酸催化的苯甲醛与甲醇缩合反应

采用铌酸为催化剂,探索了该催化剂对苯甲醛与甲醇缩合反应的影响.优化反应条件是,催化剂用量为反应物质的量的5mol%,甲醇10mL(兼作溶剂),回流状态下反应2h,反应的产率和转化率分别达到94%、98.0%.该催化剂同样适用于其他醛(酮)与甲醇的缩合反应,可得到34%～89%的产率.所述方法操作简单、产率高、选择性好而且对环境友好,反应结束后,催化剂很容易回收,并能有效重复使用.     

新型添加剂全氟辛酸铵对提高锂离子电池安全性能的研究

报导可显著提高锂离子电池安全性的新型电解液添加剂全氟辛酸铵(APC). UL 94 可燃性试验显示添加0.70 wt% APC能使有机电解液的火焰传播速率下降33%. 差示扫描量热法(DSC)测试表明APC显著减弱了嵌锂碳电极和电解液之间的放热反应, 并将其热不稳定温度由138.0 ℃提高到167.5 ℃. 交流阻抗检测显示APC的加入明显降低了碳材料电极的界面阻抗, 并且提高了在储存过程中其固态电解质界面(SEI)层的稳定性. 添加APC还能有效地提高Li/MCMB电池充放电循环性能和库仑效率.     

A Chain Structure Based on Homodinuclear Scandium Units： [Sc（μ-OH）（2,5-pydc）（H2O）]n

The reaction of pyridine-2,5-dicarboxylic acid with Sc2O3 under hydrothermal con- dition yields a new complex [Sc（μ-OH）（2,5-pydc）（H2O）]n 1 which has a chain structure based on homodinuclear scandium units. Crystal data for 1： space group P^-1, a = 6.7192（13）, b = 7.6131（13）, c = 8.9313（14） A, α = 95.976（6）, β = 101.663（6）, γ = 108.151（5）^o, V= 418.26（13） A^3, Z = 2, Dc = 1.946 g/cm^3, g = 0.889 mm^-1, F（000） = 248, C7H6NO6Sc, Mr = 245.09, the final R = 0.0429 and wR = 0.1086.