16电子半夹心结构含硫碳硼烷钴配合物CptCoS2C2B10H10的合成以及结构表征

八羰基二钴Co2(CO)8与叔丁基取代的环戊二烯反应，可以得到半夹心结构的羰基钴化合物Cp^tCo(CO)2(2)(Cp^t=η^5-^tBuC5H4)，化合物(2)与元素碘进行反应可以被氧化成相应的钴的碘化产物Cp^tCo(CO)I2(3)，采用碳硼烷含硫锂化合物[(THF)3LiS2C2B10H10Li(THF)]2(1)与18电子半夹心结构羰基钴的碘化物Cp^tCo(CO)I2(3)反应得到16电子半夹心结构化合物Cp^tCoS2C2B10H10(4)，表征了化合物(2)，(3)和(4)，并解析了配合物(4)的X—衍射的单晶结构。     

双(塞二唑胺基)茂基稀土金属配合物的合成及表征

用合成出的三茂基稀土化合物（用Ｃｐ３Ｌｎ表示）和２－氨基－５－（对甲氧基苯基）－１,３, ４－噻二唑（用 ＬＨ表示）,在无水无氧条件下采用 Ｓｃｈｌｅｎｋ技术,以 Ｃｐ３Ｌｎ和 ＬＨ（混合比１：２）反应, 合成了稀土金属有机配合物 ＣｐＬｎＬ２（Ｃｐ＝η５－ Ｃ５Ｈ５; Ｌｎ＝ Ｙｂ, Ｔｍ, Ｅｒ）．这些配合物均经元素分析、 红外光谱和质谱表征．从有关数据推测出可能的结构．     

中心功能化二异羟肟酸及其钴(II)配合物的合成

由对氯苯酚或对甲氧基苯酚出发,经多步反应合成了一系列含中心功能基的二异羟肟酸开链冠醚L1H2~1L6H2及其钴(II)配合物CoL1~CoL6,其产率分别为48.3%~68.7%、73.2%~81.9%,结构经元素分析,IR、1HNMR、MS和摩尔电导表征得以确认。     

Miniaturized volume holographic optical data storage and correlation system with a storage density of 10 Gb／cm^3

The general idea of holographic optical data storage (HODS) is briefly introduced. Based on the recent advances of HODS, the key techniques and the challenges of HODS are discussed. Some new techniques are proposed to improve the system. A miniaturized volume holographic data storage and correlation system is presented. It can achieve a density of 10 Gb/cm^3 and a fast correlation recognition rate of more than 2000 images per second. It shows the attracting potential advantages over other conventional storage methods in the information storage as well as information processing.     

Adsorption and reaction of CO and O2 on the Ag/Pt(110) surface studied by photoemission electron microscopy

The Ag/Pt(110) model catalyst was prepared by evaporating silver on Pt(110). Adsorption and reaction of CO and O₂ on Ag/Pt(110) surface were studied in situ by photoemission electron microscopy (PEEM) during the pressure range of 10^-5——10^-2 Pa at 480 K. The Ag/Pt(110) surface consisted of Pt(110), AgPt interface and Ag area after annealing at 500 K. The dosing pressure of CO and O₂ had a larger influence on their adsorption on the Ag area than on the Pt(110) and AgPt interface. Small Pt clusters formed on the Ag area and AgPt interface, which had a stronger ability to adsorb CO than Pt(110) terrace. The existence of Ag had an obvious influence on the kinetic of CO oxidation on Pt(110). No pattern was observed on the AgPt interface under the same condition when the formation of reaction-diffusion waves occurred on Pt(110).     

Synthesis and characterization of monoclinic TiO<Subscript>2</Subscript> nanosheets

A novel two-step method for the synthesis of monoclinic titanium oxide （i.e. TiO2（B）） nanosheets is presented in this report. The method is featured by two steps： 1） synthesis of hydrogen titanate nanosheets, followed by 2） calcination of the titanate nanosheets at elevated temperatures. The hydrogen titanate nanosheets were prepared first by autoclaving anatase TiO2 powders, obtained by air cal- cining an ethanol-gel of Ti（OH）4 at 500℃, in aqueous NaOH （10 mol/L） at 150-200℃, and then by washing with hydro- chloric acid under supersonic irradiation. While sizes of the nanosheets were found to increase with increasing the temperature of the hydrothermal treatment, the calcination at 400-500℃ of the hydrogen titanate nanosheets that were synthesized at higher autoclaving temperatures （180-200℃） produced monoclinic TiO2 nanosheets with a uniform morphology. By contrast, the same calcination of the titanate nanosheets synthesized at the autoclaving temperature 180℃ led to anatase TiO2 nanoparticles.     

Synthesis and properties of water-soluble oligo-（p-phenylkene vinylene）

A water-soluble oligo(p-phenylkene vinylene)[4,4′-(1,4-phenylene dithenylene)-bis-(N-methyl pyridinium iodide)] was synthesized by Witting reaction. The oligomer was characterized by NMR, elemental analysis, UV-visible spectrum, surface photovoltage spectrum and fluorescence spectrum.     

Fermentation of xylose to produce ethanol by recombinant <Emphasis Type="Italic">Saccharomyces cerevisiae</Emphasis> strain containing <Emphasis Type="Italic">XYLA</Emphasis> and <Emphasis Type="Italic">XKS1</Emphasis>

Fermentation of the pentose sugar xylose to produce ethanol using lignocellulosic biomass would make bioethanol production economically more competitive. Saccharomyce cerevisise, an efficient ethanol producer, cannot utilize xylose because it lacks the ability to convert xylose to its isomer xylulose. In this study, XYLA gene encoding xylose isomerase (XI) from Thermoanaerobacter tengcongensis MB4T and XKS1 gene encoding xylulokinase (XK) from Pichia stipitis were cloned and functionally coexpressed in Saccharomyces cerevisiae EF-326 to construct a recombinant xylose-utilizing strain. The resulting strain S. cerevisiae EF 1014 not only grew on xylose as sole carbon source, but also produced ethanol under anaerobic conditions. Fermentations performed with different xylose concentrations at different temperatures demonstrated that the highest ethanol productivity was 0.11 g/g xylose when xylose concentration was provided at 50 g/L. Under this condition, 28.4% of xylose was consumed and 1.54 g/L xylitol was formed. An increasing fermentation temperature from 30℃ to 37℃ did not improve ethanol yield.