金属卟啉配合物对亚硫酰氯还原反应的电催化行为

研究了四对甲氧基苯基金属卟啉配合物对SOCl₂还原反应的电催化行为.实验结果表明,金属卟啉配合物对SOCl₂还原反应有较好的电催化活性,不同中心离子配合物的活性顺序是Fe²⁺≈Co²⁺>Ni²⁺.这类配合物能阻止反应产物LiCl在电极表面沉积,增大电池放电容量.     

Voltage-tunable Electroluminescence of Porous Silicon

The voltage-tunable EL was obtained upon cathodic bias of n-type PS in contact with aqueous solution containing the persulphate ion. The EL behavior as a function of the external voltage and time was investigated. The results suggest that the mechanisms of voltage-tunable EL of n-typt PS cannot easily be attributed to quantum confinement effect.     

类立方烷过渡金属簇合物(n-Bu4N)3[MoAg3BrI3S4]激发态寿命测量

本文在类立方烷过渡金属簇合物(n-Bu₄N)₃[MoAg₃BrI₃S₄]空气饱和乙氰溶液中实现了瞬态全光开关.由开关时间推断出这种材料的激发态寿命约600ns,约为C₆₀三重态第一激发态在空气饱和甲苯溶液中寿命的2倍.     

Semiopen Physical Vapour Transport Growth of Urotropine Crystals

It is reported for the first time the growth of urotropine (HMT) crystals by a semiopen physical vapour transport (SOPVT) technique. HMT crystals, approximately 1 cm³ in volume, are grown on a glass pedestal from solution-grown seeds. The final habit of the crystals is limited by rhomboedrical {110} faces which develop on an otherwise hemispherical shape. Preliminary X-ray diffraction investigations (rocking curves and topographs) point to a still non-homogeneous crystal structure, which very likely originates at the seed-crystal interface. However, in comparison with solution-grown samples, the best structural quality was observed in a SOPVT-grown sample.     

双金属NiCoP的制备、表征及其性能研究

采用溶剂热法成功地制备出特定组成和形貌的NiCoP微晶.产物的物相和纯度利用X射线粉末衍射仪进行表征,结果表明,所得到的产物为纯六方相的NiCoP结构,并且结晶度很高;产物的形貌和尺寸利用扫描电子显微镜进行表征,结果显示,该产物是由平均直径为1 ～2 μm的实心球组成.为了得到最佳的制备条件,我们还进行了一系列的溶剂、温度和时间条件实验.此外,我们对产物进行了吸附性能的研究.实验结果表明,所制备的产物NiCoP实心球对一些有机染料表现出了较好的吸附性能,如甲基橙,孔雀石绿.     

XPS and SRUPS study of oxygen adsorption on Cd0.9Zn0.1Te (1 1 1)A surface

Synchrotron radiation ultraviolet photoemission spectroscopy (SRUPS) and X-ray photoelectron spectroscopy (XPS) have been applied to investigate oxygen adsorption on a cadmium zinc telluride (CZT) (1 1 1)A surface. The surface chemical composition and the surface oxidation process were monitored by recording the Te 3d, O 1s, Zn 2p, Cd 4d core level peaks, and the Cd MNN Auger peak. The CZT (1 1 1)A surface was effectively oxidized by dosing oxygen directly. The typical surface state of the clean CZT (1 1 1)A surface was identified. After oxygen exposure, this surface state disappeared and a signal due to the formation of O–CZT appeared. In addition, the work function of CZT decreased with the increasing oxygen exposure.     

Alkaloids from the Leaves and Stems of Daphniphyllum calycinum

One new alkaloid, named caldaphnidine H ( 1 ), together with eight known ones, daphnioldhanin G ( 2a ), methyl homosecodaphniphyllate ( 3 ), daphnezomine M ( 4 ), daphniyunine A ( 5 ), calyciphylline A ( 6 ), deoxycalyciphylline B ( 7 ), deoxyisocalyciphylline B ( 8 ), and calyciphylline B ( 9 ) was isolated from the leaves and stems of Daphniphyllum calycinum. The structure of 1 was established by spectral methods, especially 2D‐NMR techniques. The structure of daphnioldhanin G ( 2b ) reported previously was revised to 2a mainly by single‐crystal X‐ray diffraction and spectral analysis.     

Synthesis of Poly（aryl ether ketone） Copolymers Containing Adamantyl-substituted Naphthalene Rings

1 Introduction High performance polymers have received con-siderable attention over the past decade owing to their increased demands as replacements for metals or     

ZnO/ZnS复合材料的制备、表征及其光学性能研究

通过简便的两步水热法成功合成了ZnO/ZnS复合材料,通过X射线衍射(XRD)、扫描电镜(SEM)、透射电子显微镜(TEM)、荧光光谱(FTR)和紫外-可见分光光度计(UV-vis)对所得产物进行表征.结果表明:复合物由大量针状的六方纤锌矿氧化锌结构和立方相硫化锌纳米粒子组成,并且ZnS纳米粒子成功的组装在针状ZnO纳米单体的表面,成功合成了ZnO/ZnS复合材料.光学性能研究表明,复合物ZnO/ZnS比ZnO单体表现出更为优异的光致发光性及紫外吸收性能.     

纳米结构氧化铁棒束的制备、表征及光学性质

以三氯化铁(FeCl3·6H2O)和氨三乙酸(N(CH2COOH)3)为主要原料,在160℃反应12h得到了空心管状的白色前驱体,再经500℃煅烧2h得到了纳米结构氧化铁棒束.通过热重分析(TG)、光学显微镜、X射线衍射(XRD)、扫描电子显微镜(SEM)、红外光谱(FT-IR)、紫外-可见光谱(UV-Vis)对所得产物进行了表征.结果表明:所得白色前驱体经500℃煅烧后全部转化为六方相的氧化铁(α-Fe2O3),形貌为含微孔结构的棒束,直径约为2μm,其结构单元为含微孔结构的纳米棒,这些棒的直径为30～50 nm,长度约16μm;紫外数据表明所得氧化铁棒束的最大吸收波长为546nm,带宽吸收约在685 nm处,发生红移.