基于四硫富瓦烯衍生物Langmuir-Blodgett膜的研究进展

在简要介绍了Langmuir-Blodgett (LB)膜的基础上, 主要依据制备LB膜的四硫富瓦烯(TTF)衍生物化学结构的不同, 概括了基于两亲性TTF衍生物、非两亲性TTF衍生物、TTF电荷转移(CT)复合物或盐、以及TTF金属络合物LB膜的制备、结构表征与性能研究进展. 介绍了基于TTF衍生物的LB膜在导电、化学及生物传感器、光学以及磁性方面的应用, 并对基于TTF衍生物LB膜的发展进行了展望.     

四硫代富瓦烯及其CT复合物导电LB膜

通过Langmuir-Blodgett（LB）技术制备导电性有机超薄膜近年来受到了广泛的关注，导电LB膜的膜材料主要是含有电子受体77’，8，8’一四氨基二亚甲基本自（TCN则的电行转移（CT）复合物间以及给体分子特别是四流代宫瓦烯衍生物［‘刮.在以前的工作中，我们曾报导了四等基硫四硫     

基于四硫富瓦烯衍生物导电LB膜研究概况

四硫富瓦烯(TTF)是具有可逆氧化还原性质的强电子给体, 由其衍生物制备的导电Langmuir-Blodgett (LB)膜可应用于分子材料及分子电子器件方面的研究. 简要综述了近年来具有代表性的基于TTF衍生物的导电LB膜及其可能用途.     

四硫富瓦烯衍生物/硬脂酸LB膜的表征

研究了四（苄硫基）四硫富瓦烯／硬脂酸（TBT－TTF／SA）（1：1）LB膜、二（亚乙二硫基）四硫富瓦烯／硬脂酸（BEDT－TTF／SA）（1：1）LB膜和四（十六烷硫基）四硫富瓦烯／硬脂酸（THT－TTF／SA）（1：1）LB膜的结构．从X射线衍射结果得到了LB膜的层间距离．X射线衍射图显示了TBT－TTF／SALB膜和BEDT－TTF／SALB膜的层间结构由硬脂酸控制．从偏振红外结果计算出硬脂酸和四硫富瓦烯衍生物在LB膜中的取向角．根据分子取向角确定了LB膜的层间结构．用分子长度和分子取向角得到的层间距离与从X射线衍射得到的层间距离相吻合．     

2,3-二硫甲基-6,7-二硫十六烷基四硫代富瓦烯的合成

Langmuir-Blodgett(简称LB)法作为分子水平的成膜技术,能制备纳米级几乎无缺陷的单分子层或多分子层膜,在微电子学,分子器件,磁性有序材料,生物膜等方面有广泛的应用前景。目前,四硫富瓦烯类衍生物作为导电LB膜材料的研究,引起人们极大的兴     

荧光素衍生物LB膜对TiO2电极的光敏化作用

合成了三种荧光素长碳链衍生物，通过LB技术将它们组装成单分子薄膜，修饰在用溶胶-凝胶法制备的TiO2透明电极上，研究了这些LB膜的结构和特性及它对TiO2的光增感作用．并对其光敏化机理作了阐述．     

2-烷基-苯并咪唑在硝酸银亚相上的Langmuir膜及LB膜

对不同链长的2-烷基-苯并咪唑衍生物（BzCn,烷基链长从C5到C15）在硝酸银亚相上的成膜行为及形成的LB膜的结构进行了研究.表面压－面积曲线的结果表明，短链(C5～C9)的2-烷基-苯并咪唑可在银离子亚相上形成稳定的单分子膜，而长链(C13和C15)衍生物则形成多层膜.利用LB技术可将上述Langmuir膜转移到固体基板上形成LB膜，其吸收光谱的结果说明了苯并咪唑和银离子配位.利用AFM、XRD及FT-IR等技术研究了烷基链长对LB膜结构的影响.实验结果表明,除了BzC15，其余的衍生物都可形成规整的层状结构.短链衍生物的单层LB膜具有均一、平整的形貌；而对于BzC15，观察到多层结构.     

新型LB成膜材料—两亲性侧链取代酞菁锌的合成

本文合成了一种新型的两亲性硬脂酸侧链取代的酞菁化合物。利用LB膜技术制备了致菁化合物与正十六烷混合的单层和多层LB膜,LB膜内酞菁分子大环与基片大体平行,表明该分子具有良好的成膜性能。     

新型LB成膜材料-两亲性侧链取代酞菁锌的合成

本文合成了一种新型的两亲性硬脂酸侧链取代的酞菁化合物, 利用LB膜技术制备了酞菁化合物与正十六烷混合的单层和多层LB膜, LB膜内酞菁分子大环与基片大体平行, 表明该分子具有良好的成膜性能。     

TC16PyP(4)/AnQ混合LB膜结构的研究

我们曾报道了沉积在 Sn O2 导电玻璃基片上的 5 ,1 0 ,1 5 ,2 0 -四 -(4 -十六烷基吡啶基 )卟啉 [TC16 Py P(4 ) ]LB膜的光电性质 [1] .结果表明 ,电解质溶液中含有电子给体和受体时 ,由于超敏化作用 ,样品光电效应明显增强 .在研究其它 LB膜时 ,我们发现将两亲性卟啉分子 A与等物质的量憎水性化合物 B一起拉膜时 ,有可能得到一一对应的混合 LB膜[2 ] .如果 A和 B分别为电子给体和受体 (反之亦然 ) ,A和 B之间应有较强的相互作用 .将这种混合 LB膜沉积在基板上 ,可能表现出新的电子与光学性质 ,从而得到具有多种功能的新材料 .本文…     

Wetting of a drop on a sphere

In this work, the equilibrium morphology of a drop on a sphere is analyzed as a function of the contact angle and drop volume experimentally and with analytical effective interfacial energy calculations. Experimentally, a drop on a sphere geometry is realized in an oil bath by placing a water drop on a sphere coated with a dielectric, of which the radii of curvature are comparable with that of the drop. Electrowetting (EW) is used to change the contact angle of the water drop on the sphere. To validate the applicability of EW and the Lippman-Young equation on nonflat surfaces, we systematically investigate the response of the contact angle to the applied voltage (EW response) for various drop volumes and compared the results with the case of a planar surface. The effective interfacial energy of two competing morphologies, namely, the spherically symmetric "completely engulfing" and "partially engulfing" morphologies are calculated analytically. The analytical calculations are then compared to the experimental results to confirm which morphology is energetically more favored for a given contact angle and drop volume. Our findings indicate that the "partially engulfing" morphology is always the energetically more favorable morphology.     

Polymeric Antitumor Agents on a Molecular and on a Cellular Level?

“Chemistry has become a mature science, with all the advantages and handicaps of maturity: harvest is abundant, but many people think future and adventure are to be found elsewhere”^[1a]. This holds true—in 1981, the year of Hermann Staudinger's 100th birthday—for macromolecular chemistry, too. Where can the polymer chemists seek adventures? Unsolved problems in neighboring fields like medicine and molecular biology attract his zeal. Cancer chemotherapy is such a field. Can the polymer chemist help to solve its problems? Polymers may be pharmacologically active as such. If used as carriers, they may, due to their intrinsic properties, influence body distribution, excretion or cell uptake of the pharmaca they carry. Hence, there is a chance for new ways in therapy, including affinity chemotherapy using synthetic macromolecules. Our own body has a perfect biological system for affinity therapy: immune response to infection selectively attacks foreign cells, It is fascinating to observe what the immune system does to a tumor cell which could not escape immune surveillance (cf. Fig. 14). Can these specific cell-cell interactions be mimicked? What do we have to learn for an experimental approach to this adventure? Stable membrane and cell models can be synthesized, a first step towards this goal. Macromolecular chemistry is far from being able to offer satisfying solutions for a specific tumor therapy; striving for it, polymer chemists can learn lots of things. In order to do so, they will have to enter neighboring fields and they will have to be willing and able to cooperate.     

Trapping a pseudo-Hofmann rearrangement on a ruthenium cluster

In the clusters [Ru3(micro(3)-NPPh(3))(micro(3)-OSiMe(3))(micro-X)(micro(C,O)-OC[double bond]NPPh(3))(micro-CO)(CO)6] (X = NCO, 2; X = Cl, 3), which were prepared by a pyrolytic reaction of Ph(3)PNSiMe(3) with Ru(3)(CO)12, the ligands result from a cluster-mediated pseudo-Hofmann rearrangement involving the micro-NCO, micro(C,O)-Ph(3)P[double bond]N-CO and micro(3)-NPPh(3) fragments.     

Protein adsorption on a nanoparticle with a nanostructured surface

In the present study, the adsorption of a protein on a nanoparticle with a nanostructured surface, which is created using successively patterned Gaussian pillars (GPs), is simulated by considering the charge regulation within the electrical double layer of a silica nanoparticle (NP). Namely, the mathematical models for the adsorption mechanism, such as classical Langmuir model, extended Langmuir model, and two-state model, are coupled with charge regulation model. By this means, size and pH variables are able to included to the calculations. Moreover, free space, surface curvature, and conformational changes are also taken into account. For systematic investigation, the solution's pH, surface charge density, initial protein concentration, electrostatic charge of the protein, and the diameter of the spherical NP are varied. As a result, the vital properties of a nanoparticle, such as protonation/deprotonation, polarization, topography, and morphology, are considered in the current simulations. The surface charge density and surface chemistry change with NP and GP sizes. The present results reveal that the protein adsorption on an NP with a smooth surface reaches a faster complete surface coverage than an NP with a nanostructured surface. Both states of conformational changes are also affected by the presence of the GP.     

新型不对称四硫代富瓦烯导电LB膜的研究

新型不对称四硫代富瓦烯导电ＬＢ膜的研究李洪启姚钟麒刘丹谭干祖俞贤达（中国科学院兰州化学物理研究所７３００００）Ｌａｎｇｍｕｉｒ－Ｂｌｏｄｇｅｔ（ＬＢ）技术已成为制备分子厚度的有序导电薄膜的有力工具，该领域中四硫代富瓦烯（ＴＴＦ）衍生物是导电ＬＢ膜的研...