CuSO4 Micro-crystal Lattice Produced by Microcontact Printing

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅ ｐｒｅｐａｒａｔｉｏｎｏｆｍｉｃｒｏ ｐａｒｔｉｃｌｅｌａｔｔｉｃｅｗｉｔｈｓｔｒｉｃｔｓｉｚｅｓａｎｄｓｐａｃｅｃｏｎｔｒｏｌｉｓａｎｉｍｐｏｒｔａｎｔｐｒｏｂｌｅｍｔｏｂｅｓｏｌｖｅｄｕｒｇｅｎｔｌｙｉｎｍａｎｙｈｉｇｈ ｔｅｃｈｆｉｅｌｄｓ .Ｔｒａｄｉ ｔｉｏｎａｌｍｉｃｒｏ ｆａｂｒｉｃａｔｉｏｎｍｅｔｈｏｄｉｓｐｈｏｔｏｌｉｔｈｏｇｒａｐｈｙ ,ｂｕｔｉｔｉｓｕｎａｂｌｅｔｏｐｒｏｄｕｃｅａｎｙｐａｔｔｅｒｎｓｏｎａｃｕｒｖｅｄｓｕｒｆａｃｅａｎｄｄｉｆｆｉｃ…     

用于CO2加氢合成甲醇超细CuO-ZnO/SiO2-ZrO2催化剂

用溶胶－凝胶法制备了ＣｕＯ－ＺｎＯ／ＳｉＯ２－ＺｒＯ２复合氧化物催化剂，使用ＩＲ，ＸＲＤ，ＴＥＭ和ＢＥＴ等手段对催化剂的结构及表面性能进行了表征，考察了ＺｒＯ对该体系的表面性质，结构，ＣｕＯ分散状态以及二氧化碳加氢合成甲醇的催化性能的影响。结果表明，该体系催化剂的比表面积大，活性组分分散均匀。     

Spectroscopic study and antioxidant properties of the inclusion complexes of rosmarinic acid with natural and derivative cyclodextrins

Measurement of total antioxidant activity/capacity of polyphenols in various solvent media necessitates the use of cyclodextrins to solubilize lipophilic antioxidants of poor aqueous solubility. The inclusion complexes of the slightly water soluble antioxidant, rosmarinic acid (RA), with α-cyclodextrin (α-CD), β-cyclodextrin (β-CD), 2-hydroxypropyl-β-cyclodextrin (HP-β-CD), 2-hydroxyethyl-β-cyclodextrin (HE-β-CD), and methyl-β-cyclodextrin (M-β-CD) were investigated for the first time. The effect of cyclodextrins (CDs) on the spectral features of RA was measured in aqueous medium using UV-vis and steady-state fluorescence techniques by varying the concentrations of CDs. The molar stoichiometry of RA-CD inclusion complexes was verified as 1:1, and the formation constants of the complexes were determined from Benesi-Hildebrand equation using fluorescence spectroscopic data. Among the CDs, maximum inclusion ability was measured in the case of M-β-CD followed by HP-β-CD, HE-β-CD, β-CD and α-CD. Solid inclusion complexes were prepared by freeze drying, and their functional groups were analyzed by IR spectroscopy. Antioxidant capacity of CD-complexed rosmarinic acid was measured to be higher than that of the lone hydroxycinnamic acid by the CUPric Reducing Antioxidant Capacity (CUPRAC) method. The mechanism of the TAC increase was interpreted as the stabilization of the 1-e oxidized o-catechol moiety of RA by enhanced intramolecular H-bonding in a hydrophobic environment provided by CDs, mostly by M-β-CD.     

官能化二硫缩烯酮的选择性α-溴代反应

发展了一种适用范围广、高效且高选择性的官能化二硫缩烯酮的α-溴代反应.在少量水存在下,在四氢呋喃溶液中,以溴化铜为溴代试剂,经由官能化二硫缩烯酮(1)的α-溴代反应制备了结构多样的α-溴代二硫缩烯酮(2).     

Oxidative aromatization of Hantzsch 1,4-dihydropyridines by cupric bromide under mild heterogeneous condition

A mild heterogeneous oxidizing agent, cupric bromide has been utilized for the oxidative aromatization of Hantzsch 1,4-dihydropyridines to the corresponding pyridine derivatives in excellent yields with the isolation of products by simple work-up procedure.     

From 2-D CuO nanosheets to 3-D hollow nanospheres: interface-assisted synthesis, surface photovoltage properties and photocatalytic activity

CuO hierarchical hollow nanostructures, assembled by nanosheets, were successfully prepared in n-octanol/aqueous liquid system through a microwave approach. Controlled experiments revealed that both bubble and interface play key roles in determining the self-assembly process of CuO hierarchical hollow nanostructures, and the morphology/size of building blocks and final products could be readily tuned by adjusting reaction parameters. Furthermore, a self-assembly mechanism of aggregation-then-growth process through bubble template was proposed for the formation of the hollow hierarchical architectures. Photocatalytic performance evidenced that the obtained CuO hierarchical hollow nanostructures possessed superior photocatalytic efficiency on RhB than that of non-hollow nanostructures, which could be easily demonstrated by SPS response about the separation and recombination situation of photogenerated charges.     

Determination of linear aliphatic aldehydes in heavy metal containing waters by high-performance liquid chromatography using 2,4-dinitrophenylhydrazine derivatization

A simple and sensitive method is described for the determination of picomolar amounts of C₁–C₉ linear aliphatic aldehydes in waters containing heavy metal ions. In this method, aldehydes were first derivatized with 2,4-dinitrophenylhydrazine (DNPH) at optimized pH 1.8 for 30 min and analyzed by HPLC with UV detector at 365 nm. Factors affecting the derivatization reaction of aldehydes and DNPH were investigated. Cupric ion, an example of heavy metals, is a common oxidative reagent, which may oxidize DNPH and greatly interfere with the determination of aldehydes. EDTA was used to effectively mask the interferences by heavy metal ions. The method detection limits for direct injection of derivatized most aldehydes except formaldehyde were of the order of 7–28 nM. The detection limit can be further lowered by using off-line C₁₈ adsorption cartridge enrichment. The recoveries of C₁–C₉ aldehydes were 93–115% with a relative standard deviation of 3.6–8.1% at the 0.1 μM level for aldehydes. The HPLC–DNPH method has been applied for determining aldehyde photoproducts from Cu(II)–amino acid complex systems.     

基于罗丹明荧光信号报告基团的细胞通透性铜离子荧光探针

分别以罗丹明B和罗丹明6G为荧光信号报告基团,以增强水溶性为目的的羟乙基肼为修饰基团,合成了反应型的Cu_(2+)离子选择性荧光探针分子L1和L2.紫外光谱和荧光光谱等分析结果表明,探针分子L1和L2对Cu_(2+)离子具有高灵敏度、高选择性的光谱识别行为.探针分子对Cu_(2+)离子的识别过程是通过Cu_(2+)离子催化水解控制氧杂蒽荧光信号的螺环酰肼基团实现荧光信号的开启,从而达到识别检测Cu_(2+)离子的目的,对Cu_(2+)离子的检出限均可达到10-8mol/L量级.同时,探针分子对常见金属离子和铵离子均具有较强的抗干扰能力.由于羟乙基肼的引入增强了探针的水溶性,使得探针L1和L2具有良好的细胞通透性和低毒性,实现了其对β-胰岛细胞(INS-1细胞)中Cu_(2+)离子的荧光成像检测.     

光电化学方法研究嵌入反应

自从七十年代Steele和Armand等提出用嵌入材料作为电池的活性物质以来,新型的高能锂电池有了很大的发展.这类电池反应的特点是伴随电子转移的同时还有锂离子进入阴极主体晶格中,故称为嵌入反应.然而,从研究嵌入反应的方法来看,除了电位扫描等经典的电化学技术以外,用的是X射线衍射、X射线光电子能谱等非现场的表面测试技术,分析放电后阴极中有锂存在,证明这类反应机理是锂离子的嵌入反应.迄今为止,尚未见到在放电过程中现场检测锂离子嵌入的方法的报导.鉴于嵌入反应电池的阴极材料大多数是金