链状[NH3CH2CH2NH3]AgAsS4的溶剂热合成及表征

利用溶剂热方法合成了链状[NH3CH2CH2NH3]AgAsS4,通过单晶X射线衍射技术对其进行了晶体结构分析,该化合物晶体属单斜晶系,空间群C2/c,晶胞参数a=1.35805(8)nm,b=0.65331(3)nm,c=2.27711(9)nm,β=106.42(3)°,Z=8.化合物具有有趣的梯子状双链结构,该阴离子链由AsS4与AgS3共用顶点交替连接而成,有机阳离子在阴离子链之间存在较强的N—H…S氢键.DSC和Tg分析结果表明化合物在200℃以下是稳定的.     

含胺基功能性单体的聚合研究 Ⅴ.4-N,N-二甲胺基苯乙烯的合成及其作为氧化还原引发体系组分的研究

<正> 前文我们报告了含有芳香叔胺基的丙烯酸酯、甲基丙烯酸-4-N,N-二甲氨基苄酯(DMABMA)在过氧化二月桂酰(LPO)引发下的聚合动力学。从所得的聚合速度方程式及低的聚合活化能,认为DMABMA与LPO形成氧化还原体系而使DMABMA聚合,在本文第Ⅳ报中报道了DMABMA不仅能引发甲基丙烯酸甲酯的聚合,还参与聚甲基丙烯酸甲酯的链中,因此称这种既能参与引发聚合反应,又参与聚合物链中的引发“引发剂单体(initiatomer)”。这种含有可聚合胺引发体系的优点是,用于丙烯酸酯类医用     

Photocurrent generation in multilayer self-assembly films fabricated from water-soluble poly(phenylene vinylene)

A novel, water-soluble, cationic PPV derivative poly[(2,5-bis(3-bromotrimethylammoniopropoxy)-phenylene-1,4-divinylene)-alt-1,4-(2,5-bis(2-(2-hydroxyethoxy)ethoxy))phenylene vinylene] (BH-PPV) has been synthesized by a Heck coupling reaction. Multilayered assemblies of the BH-PPV and the sodium salt of hexa(sulfobutyl)fullerenes (C(60)-HS) were fabricated successfully by an alternate deposition technique. The multilayer structures were studied by UV/Vis spectroscopy, small angle X-ray diffraction, and atomic force microscopy. The photoinduced charge transfer property of the self-assembled multilayer film was also measured by a three-electrode cell technique. A steady and rapid cathodic 5.5 microA cm(-2) photocurrent response was measured as the irradiation of the multilayer film was switched on and off. Importantly, the response of on/off cycling is prompt and reproducible. A possible mechanism for the electron-transfer process is proposed.     

Mass spectral fragmentation of (S,S)-2-substituted 4,4-diphenyl-3,1-oxazabicyclo[3.3.0]octanes: ring contraction of pyrrolidine and 1,3-oxazolidine in mass spectrometry

The mass spectral behaviour of (S,S)-2-substituted 4,4-diphenyl-3,1-oxazabicyclo[3.3.0]octanes has been studied with the aid of mass-analyzed ion kinetic energy spectrometry and accurate mass measurements under fast atom bombardment (FAB) and electron impact (EI) ionization conditions. Under FAB ionization, all compounds show a tendency to form protonated aldehyde or benzophenone ions and to form protonated 1-azabicyclo[3.1.0]hexane ions, which can further lose an ethylene or cyclopropane from the pyrrolidine ring to produce protonated 1-azabicyclo[1.1.0]butane ions and 3H-azirine ions, respectively. Under EI ionization, a similar fragmentation to that under FAB ionization was observed. The title compounds also show a tendency to yield oxirane ions and oxirenium ions by loss of pyrrolidine and pyrrolidine plus H. Ring contractions of 1,3-oxazolidine by loss of an aldehyde or ketone and of pyrrolidine by loss of an ethylene or cyclopropane were observed under both FAB and EI ionization conditions.     

AFM study of hippocampal cells cultured on silicon wafers with nano-scale surface topograph

The rat hippocampal cells were selected as model to study the interaction between the neural cells and silicon substrates using atomic force microscopy (AFM). The hippocampal cells show tight adherence on silicon wafers with nano-scale surface topograph. The lateral friction force investigated by AFM shows significant increase on the boundary around the cellular body. It is considered to relate to the cytoskeleton and cellular secretions. After ultrasonic wash in ethanol and acetone step by step, the surface of silicon wafers was observed by AFM sequentially. We have found that the culture leftovers form tight porous networks and a monolayer on the silicon wafers. It is concluded that the leftovers overspreading on the silicon substrates are the base of cell adherence on such smooth inert surfaces.     

富烯碳原子簇的石墨层间闭合形成机理

本文提出了富烯碳原子簇的石墨层间闭合形成机理，由该机理推出的许多结果与实验事实符合很好。我们认为碳原子簇自由基的快速淬灭及其淬灭速度是富烯碳原子簇形成及其丰度的决定因素。由此得出富烯碳原子簇在给定实验条件下产生的必然性，并预言不同大小的富烯碳原子簇可以通过优化实验条件选择性地合成。     

聚丙烯腈高分子半导体纤维的研究——聚丙烯腈高分子半导纤维的制备及其半导体特性

经四氯化锡处理的聚丙烯腈纤维,在进一步热处理过程中可以成为一种高分子半导纤维。它具有如下四个特点:1.纤维电阻率在10~3—10~(12)欧姆·厘米范围内可以控制热处理温度而随意调节。2.水解处理干燥后纤维的电阻值基本不变。3.有足够的机械强度可以进行多种形式的加工。4.纤维的电阻-温度、电导率-频率依赖关系,直流伏-安特性的试验结果表明它具有有机半导体特性,是一种兼有良好电性能和力学性能的高分子半导纤维。     

Surprisingly efficient catalytic Cr-mediated coupling reactions

[reaction: see text] With use of 1 mol % of Cr catalyst 5, surprisingly efficient Cr-mediated couplings of aldehydes with various types of nucleophiles have been realized. The catalyst set of Cr catalyst 5 and Ni catalyst 4 is used for alkenylation, alkynylation, and arylation, whereas the catalyst set of Cr catalyst 5 and CoPc (cobalt phthalocyanine) is used for 2-haloallylation, alkylation, and propargylation. Only the Cr catalyst 5 is required for allylation. The reaction rates in DME and THF have been found significantly faster than that in MeCN.     

模板组装Fe纳米线阵列及其微结构

铝在硫酸溶液中经直流阳极氧化,得到多孔铝阳极氧化膜(AAO). 以AAO膜为模板,通过交流电沉积的方法,在AAO模板孔内成功组装了Fe纳米线.TEM分析表明,Fe纳米线的长度约为2.5 μm,其长度分布十分均匀；粗细均匀,直径约为25 nm. XRD实验分析证实,所制备的Fe纳米线为α-Fe.选区电子衍射（SAED）实验分析表明,α-Fe纳米线具有单晶结构.     

无亲水基团取代的四苯基卟吩类LB膜的制备与表征

拉制了4种无亲水基团的四苯基卟吩LB膜,用透射电镜、荧光寿命、荧光光谱和紫外-可见光谱测量表征了膜的形貌和结构,发现膜中卟吩主要以聚集体形式存在。