A New Reaction-controlled Phase-transfer Catalyst System

A new reaction-controlled phase-transfer catalyst system was designed and synthesized.In this system, heteropolytungstate [C7H7N(CH3)3]9PW9O34 was used for catalytic epoxidation of cyclohexene with H2O2 as the oxidant. The conversion of H2O2 was 100% and the yield of cyclohexene oxide was 87.1% based on cyclohexene. Infrared spectra showed that both fresh catalyst and the recovered catalyst do have completely same absorption peak, indicating the structure of catalyst is very stability and can be recycled.     

微波辐射下三组分“一锅法”合成5-芳基-1,5,6,7,8,9-六氢化-2H-吡唑[5,4-b]并喹啉-6-酮

在微波辐射下以芳醛、1,3-环己二酮或达米酮和氨基吡唑为原料, 用乙二醇作能量转移剂, 三组分“一锅法”快速合成了一系列吡唑[5,4-b]并喹啉类化合物. 该方法速度快(30～90 s), 产率高(88%～98%), 环境友好. 产物结构通过红外光谱、核磁共振谱和元素分析证实, 化合物4e的单晶经X射线衍射分析, 进一步确证了产物结构.     

5-氨基-1H-1，2，4-三氮唑-3-硫代-2′-丙酸乙酯类Schiff碱的合成与表征

用氨基三氮唑硫代丙酸乙酯与取代苯甲醛反应，合成了6个新型的5-氨基-1H-1，2，4-三氮唑-3-硫代-2′-丙酸乙酯类Schiff碱，其结构经^1H NMR，IR，MS和元素分析表征。     

单环手性胍催化的对映选择性Henry反应

从取代乙二胺方便地合成了4个手性单环胍．它们催化苯甲醛或异丁基醛同硝 基甲烷的Henry反应．能以较好的产率得到产物，但产物的对映体纯度不高．苯甲 醛Henry反应产物ee值最高为31％，异丁基醛获得的ee值最高为34％．这一反应速 度快，条件温和，是合成手性硝基醇的有效方法．     

液相合成方形PbS纳米晶的光学特性

采用一种简单、温和的液相合成方法制备了PbS纳米晶，利用透射电镜和高分辨透射电镜对PbS纳米晶的形貌与晶型结构进行了表征．研究了PbS纳米晶的光学吸收和光致发光特性，并比较分析了包覆剂聚乙烯吡咯烷酮(PVP)和回流时间对产物光学特性的影响．结果表明：PVP分子链中的O原子与纳米晶表面吸附的游离态Pb原子形成Pb-O配位键，使产物的激子吸收大为减弱，同时引起了表面浅束缚态能量的升高，最终导致了荧光淬灭现象．     

Determination of Dopamine in the Presence of Ascorbic Acid on the IrO2-Ta2O5 Type DSA Electrode

IrO2Ta2O5 (70%: 30%, molar ratio) electrodes (ITEs) were prepared by the thermal decomposition method. Typical “mud-cracked” surface and surface enrichment of Ta were observed. The determination of dopamine (DA) was carried out in the presence of ascorbic acid (AA). The detection limit of DA was 5~10 5 mol/L without the interference of AA.     

Aa1Dd1-Aa2Dd2型氢键体系的网络结构参数

利用溶胶-凝胶分配理论对氢键溶液的模型体系进行研究, 给出了体系的凝胶化条件以及凝胶点后氢键网络中各类结构参数的计算方案, 并进行了相应的数值计算. 结果表明, 当两类质子受体基团的活性不同时, 质子受体基团的竞争作用对网络结构有一定影响. 这为控制氢键网络结构特征提供了可能的理论线索.     

Synthesis, crystal structure and characterization of a 2-D network organic-inorganic hybrid polymer with [α-BW12O40]5- as building blocks

A two-dimensional network compound [Ce(DMF)4(H2O)][α-BW12O40]·H2O·(HDMA)2 (HDMA = protoned dimethylamine, DMF = N,N-dimethylformamide) was synthesized from α-H5BW12O40·nH2O, Ce(NO3)3·6H2O and DMF and characterized by IR, UV spectra and TG-DTA. The result of the X-ray single crystal diffraction indicates that the crystal is monoclinic, space group P21/n, with unit cell dimensional: a = 1.1983(3), b = 2.4216(5), c = 1.9517(4) nm, β = 92.91(3)°, Z = 4, R1 = 0.07710, wR2 = 0.1416. Structural analysis indicates that every [Ce(DMF)4(H2O)]3-building block is surrounded by three adjacent [α-BW12O40]5-polyanions, meanwhile, every [α-BW12O40]5-polyanion interconnects with three neighboring [Ce(DMF)4(H2O)]3+ subunits, by making use of which two-dimensional network structure can be constructed. The result of thermogravimetric analysis manifests that the title compound has two-stage weight loss and the decomposition temperature of the title polyanionic framework is 560℃. The electrochemical analysis shows the title polyanion has three-step redox processes in the pH = 4-7 media.     

垃圾在流化床中焚烧NO排放特性研究

在Ф150 mm流化床上，研究了六类典型组分垃圾NO转化率与床温和过量空气系数(excess air简称EA)的关系。研究发现，纸渣与木块NO转化率最高，橡胶与塑料最低;织物、纸张、厨余、木块、塑料NO均具有中温生成特性，一般在800 ℃～850 ℃时即接近最大值，之后温度升高对NO的生成影响不大;橡胶与无烟煤由于含N化合物结构稳定，其NO转化率随床温升高而增大;由于挥发分析出的相互影响，较低的火焰温度，混合垃圾NO转化率一般低于单组分垃圾的线性叠加;少量水分不会对垃圾NO转化率造成很大影响，相反还会促进NO的转化，但过量水分会抑制NO的生成。