KIT-1介孔分子筛的化学修饰及吸附性能

介孔分子筛MCM-41具有较大、可调的孔径和较高的比表面积，其骨架组成具有较强的可调变性．为该材料的应用提供了很大的空间。但全硅MCM-41分子筛在潮湿空气中，即使在室温条件下也会发生水解反应，使其介孔结构遭到破坏。前人已针对MCM-41分子筛稳定性不足的问题相继合成了稳定性较高的介孔分子筛KIT-1,     

Calycilactone A, a novel hexacyclic alkaloid from Daphniphyllum calycillum

A novel Daphniphyllum alkaloid with a rearranged fused-hexacyclic ring system, calycilactone A, was isolated from the leaves of Daphniphyllum calycillum (Daphniphyllaceae), and the structure and relative stereochemistry of the new compound were elucidated on the basis of spectroscopic data.     

聚苯类共轭聚合物的合成及荧光特性研究

聚苯类共轭聚合物的合成及荧光特性研究李建科阳明书漆宗能王佛松（中国科学院化学研究所工程塑料国家重点实验室北京１０００８０）关键词聚对苯，共轭聚合物，吸收光谱，荧光光谱，发光共轭聚合物在非线性光学、光电化学池、二次电池等方面有着广泛的应用前景，近...     

单链四苯酚基卟啉在CTAB胶束微环境中的去质子化现象

叶绿素分子的光能转化功能的实现与其聚集状态、所处微环境性质及条件密切相关[1,2]．如何设计控制叶琳类分子在膜介质中的增溶位置，对于研究叶琳在膜体系中的跨膜电子传递、光能转化过程具有重要意义．本文研究了长链双亲卟啉──单链四苯酚基叶琳THPPH2在CTAB胶束中的去质子化，该过程能控制叶琳环在胶束中的增溶位置，使其由内核转移到胶束表面．1实验部分1·1仪器和测试条件岛津UV－240型紫外可见光谱仪（带有恒温夹套），狭缝宽2nm，石英池厚1cm，所用试剂皆为分析纯．UV光谱测试均在恒温条件下进行．1．2溶液的配制含一个十六…     

Study on the reaction of triple helix poly(A:2I) with Cu~(2+)

The effect of Cu2+ on the triple-stranded helical structure of poly(A:2I) was studied by means of circular dichroism spectral method with the help of ultraviolet spectral and ethidium bromide fluorescence probe methods. It was found that Cu2+ destabilizes the structure of the triple helix poly(A:2I) and induces its structural transformations, meanwhile, the transformations can be partially reversed by a higher NaCl concentration. The structural transformations may be expressed by the following scheme: poly(A:2I) - poly(A:I) + poly(I)- poly(A) + 2poly(I)     

富勒烯掺杂有机光电导材料的光电导性

富勒烯掺杂有机光电导材料的光电导性徐铸德，陈万喜，冷拥军，许小平，李文铸（浙江大学化学系，物理系，杭州，３１００２７）汪茫（浙江大学高分子科学与工程学系）关键词富勒烯，光化学，光物理，光电导体光电导材料在现代静电成像领域中有极广泛的应用，近年来，有机...     

交联聚4-乙烯基吡啶及其季铵盐负载钯催化剂对丙烯酸甲酯加氢反应的研究

 制备了交联聚4-乙烯基吡啶及碘甲烷,溴乙烷季铵化的聚4-乙烯基吡啶负载钯催化剂,考察了它们催化丙烯酸甲酯加氢反应的性能。对碘甲烷季铵化聚4-乙烯基吡啶负载钯催化剂,其催化加氢活性随载体季铵化程度的增加而减小,并且当载体季铵化程度低于80％时,其催化加氢活性比聚4-乙烯基吡啶负载催化剂高。实验结果表明催化剂制备条件对催化性能有很大影响。     

UPLC-Q-TOF MS分析海洋鱼类血清皮质醇

皮质醇浓度是反映肾上腺皮质功能的重要指标之一,海洋鱼类血清中的皮质醇激素含量随应激强度呈现规律性变化,从而被广泛用来衡量应激水平的重要指标[1].     

Synthesis of 6（E）—Geranylgeraniol—19—oic Acid

Facile synthesis of 6(E)-geranylgeraniol-19-oic acid 1,a naturally occurring alicyclic diterpene acid, by a Horner-Wadsworth-Emmons olefination of two readily available fragments 2 and 3,is described.     

Studies on the Total Synthesis of Hainanolide (VII) - Analysis of the Relative Stereochemistry of key Intermediate 2

The natural product, hainanolide 1, also under the name harringtonolide2 demonstrated antitumor and antiviral activities in preliminary test. Its structure was determined by X-ray diffraction. The total synthesis of 1 was reported recently by Mander3. A different scheme of its synthesis has been studied in our laboratory4. Here the determination of the stereochemical structure of the key intermediate 2 in the synthesis was reported. HMBC and HMQC spectra identified the skeleton and H,…