含氢键铜配合物[Cu(mal)(phen)(H2O)]2·3H2O的合成与晶体结构

丙二酸作为桥联配体可以与过渡金属形成形式多样的配合物 ,其结构和磁性已成为近年来人们研究的热点[1～ 8] ,本文报道了丙二酸邻菲罗啉铜配合物 [Cu(mal) (phen) (H2 O) ]2 ·3H2 O(mal=丙二酸根 ,phen =1 1 0 邻菲罗啉 )的合成和晶体结构 ,并探讨了氢键的作用和超分子网络结构。1　实验部分1 .1　试剂与仪器　所有试剂均为分析纯。Perkin Elmer2 4 0C型元素分析仪 (C ,H ,N) ,NicoletAvatar 370FT IR红外光谱仪 ( 4 0 0 0 40 0cm 1 ,KBr压片 ) ,德国耐驰公司STA40 9PC热分析仪 ,RigakuRAXIS IVIP单晶X 射线衍射仪。1 .2…     

High Resistive ZnO／Diamond／Si Films Grown via Metal-organic Chemical Vapour Deposition

Piezoelectric ZnO layers with high resistivity for surface acoustic wave applications were prepared on polycrystalline diamond/Si substrates with(Ill) orientation via metal-organic chemical vapour deposition.The characteristics of the films were optimized through different growth methods. The comparative study of the X-ray diffraction spectra and scanning electron microscopic images showed that the final-prepared ZnO films were dominantly c-axis oriented. Zn and O elements in the final prepared ZnO films were investigated through X-ray photoelectron spectroscopy. According to the statistical results, the n(Zn)/n(O) ratio is near 1. The Raman scattering was also performed in back scattering configuration. E2 mode was observed for the final films, which indicated that the better quality ZnO films had been obtained. The resistivity of the films was also enhanced via the modification of the growth methods.     

氯离子对模拟混凝土孔隙液中钢筋腐蚀行为的影响

应用动电位扫描法研究钢筋在模拟混凝土孔隙液中的腐蚀电化学行为以及氯离子的影响作用,并根据阳极极化曲线的变化揭示钢筋表面钝化膜的击穿电位及其变化规律,得出当溶液pH值分别为12.50和12.00时,由氯离子侵蚀引起的钢筋局部腐蚀,其钝化膜击穿电位突降的浓度临界值.     

有机金属聚合物/多酸纳米杂化LB膜的制备与光电性质研究

以含有共轭大π键的有机金属聚合物(OMP)作有机组分, 以Keggin结构和Dawson结构钨(钼)磷杂多酸作无机组分, 以十八胺为辅助成膜剂, 用LB技术制备了3种新型有机金属聚合物/十八铵/杂多阴离子OMP/ODA/HPA (HPA＝PMo₁₂, PW₁₂, P₂Mo₁₈)杂化LB膜. 用π-A曲线﹑UV-vis吸收光谱﹑荧光光谱﹑原子力显微镜(AFM)﹑扫描隧道显微镜(STM)和表面光电压谱(SPS)对标题LB膜的成膜性能及光电性质进行了研究, 结果表明标题杂化LB膜的崩溃压为26.8 mN/m, 在可见光区有较强的光电压响应, 并有好的发光性质. 当电压为±8.0 V时, 隧道电流是－0.1～－2.3 nA.     

大环手性磷酰胺对氨基酸衍生物的分子识别研究

以(S)-α-甲基苯乙胺和天然氨基酸(L-丙氨酸、L-苯甘氨酸及L-苯丙氨酸)为手性源,以2,5-二(邻羟基苯基)-1,3,4- 二唑和2,4-二(邻羟基苯基)-1,3,5- 二唑为刚性单元,合成了一系列具有光学活性的新型含 二唑磷酰胺和磷酯手性大环化合物.用NMR,IR和FABMS方法研究了所合成的手性大环对氨基酸甲酯盐酸盐和二肽的分子间相互作用和分子识别.结果表明,这些主体对D-或L-氨基酸甲酯盐酸盐和二肽具有选择性的结合作用.     

(S)-(+)-姜黄烯的立体选择性全合成

利用不对称双羟化反应和Raney镍的原位还原,高对映选择性和高产率地实现了(S)-(+)-α-姜黄烯(1)的立体选择性合成.用MsCl保护化合物7a和7b时,发现了有趣的消除和重排反应,得到对应的二烯化合物8.     

Effect of Preparation Methods of Bi2O3 Nanoparticles on their Photocatalytic Activity

Bi2O3 nanoparticles were prepared by means of ammonia precipitation, polyol mediated methods and microemulsion chemical method. The structure and properties of the as-prepared nanoparticles, having been submitted to a heat-treatment test at 750℃, were characterized by means of XRD. BET, XPS and UV-Vis absorption techniques. The photocatalytic oxidation reactions of benzene, toluene and xylene were used as the model reaction to measure the photocatalytic activity of Bi2O3 nanoparticles, respectively. The results show that the crystallite size of Bi2O3 prepared with different methods and calcined at 750℃ were 50. 6, 38.5 and 31.5 nm, respectively. The photocatalytic activity of Bi2O3 nanoparticles prepared with the microemulsion chemical method was higher than that of the particles prepared with the polyol mediated method; and that of the particles prepared with the micromulsion chemical method was the highest among the three. The degradation rates of the three pollutants xylene, toluene and benzene decreased in sequence.     

掺杂Mo6+对纳米TiO2薄膜亲水性的影响

用溶胶 凝胶法制备了一系列掺杂钼量不同的TiO₂纳米薄膜.用XRD,SEM和CAS(ContactAngleSystem)对TiO₂薄膜的结构和性能进行了表征.结果表明,Mo⁶⁺掺杂浓度对薄膜的热致亲水性和光致亲水性均有影响,当掺Mo⁶⁺质量分数为0.75%,热处理温度为400℃时,掺钼TiO₂薄膜在黑暗中放置72h后仍能表现超亲水性.     

不可微预报系统的广义变分同化方法及数值试验

讨论了不可微预报系统中的广义变分同化方法．对于不可微预报系统,由于不可微性,系统不存在切线性系统,而切线性系统的不存在,使得无法用通常的途径导出伴随系统A·D2引进不可微系统的弱形式后,可以不考虑切线性系统,而直接导出伴随系统．主要就3种形式的问题展开了讨论,第1种为低维系统,第2种情形为高维系统整体观测资料,第3种情形为高维系统局部观测资料．可以称此方法为结合反问题思想的广义变分同化方法．     

给/吸电子基团取代对PPV类电致发光聚合物光电特性的影响

用量子化学的AM1和EHMACC/CO方法计算PPV,MEH-PPV和CN-PPV的电子和能带结构,讨论了烷氧基(-OR)和氰基(-CN)侧基取代对PPV类电致发光聚合物光电特性的影响.计算结果表明:给电子基团(-OR)取代使聚合物的HOCO(最高占据晶体轨道)能级升高,电离势减小,而吸电子基团(-CN)取代使LUCO(最低未占据晶体轨道)能级降低,电子亲和势增大,两者都使聚合物能隙降低,同时使聚合物的导电类型由PPV的p型转变成CN-PPV的n和p兼容型.该结果解释了MEH-PPV和CN-PPV光谱的红移及CN-PPV高的电致发光效率,为设计新型高效的PPV类电致发光聚合物提供了理论基础.