Nanostructured Columns from Self-assemblyof Complementary Molecular Components

Nanostructured columns with a length about several tens of micrometer and a diameter of about 80 nm were obtained by molecular recognition directed self-assembly of a pair of comple- mentary molecular components, 4-amino-2 , 6-didodecylamino-1 , 3, 5-triazine(M) and 5- (4-dode- cyloxybenzylidene )-(1H, 3H)-2, 4, 6-pyrimidinetrione (B) in chloroform. In this system, with positive cooperativity, π-aromatic stacking and van der Waals interactions as well as hydrogen bonds cause the formation of the nanocolumns.

Self-assembled supramolecular networks at interfaces: Molecular immobilization and recognition using nanoporous templates

In this review a series of organic-based open porous networks are discussed, in which hydrogen bonds play an important role in network formation. Using these open networks as molecular templates: 1) a wealth of functional guest species can be immo- bilized; 2) fullerene molecules can be separated and recognized; 3) photoisomerization reactions can be observed by STM; 4) 1D molecular arrays can be constructed; and 5) heterogeneous bilayer structures can be formed. It is envisioned that these su- pramolecular networks might be developed into a new family of useful soft frameworks for studies toward shape-selective ca- talysis, molecular recognition and host-guest supramolecular chemistry.

Photo-regulation of 2D supramolecular self-assembly：On-surface photochemistry studied by STM

During the past few years,regulation and controlling of the two-dimension（2D） self-assembled supramolecular structure on surface have drawn increasing attention in nanoscience and technology.External stimuli have been widely used to regulate these 2D nanostructures.Among various external stimuli approaches,photo-regulation as one of the most outstanding means of regulation has been extensively studied because different wave bands can lead to molecular conformation variation and new bonds to gain new molecules.In this review,the photo-regulated self-assembled structure on solid surface as well as the photo-reactions of different molecules substituted with photo-sensitive groups are introduced to give us an insight into on-surface photochemistry,which plays an important role on the nano-devices fabrication.Notably,these photo-sensitive behaviors as well as the formed structures on surface were probed at sub-molecule level by unique scanning tunneling microscopy（STM） technique.

Advances in self-assembly and regulation of aromatic carboxylic acid derivatives at HOPG interface

Aromatic carboxylic acid self-assembly has been a hot research field for many scientists due to its strong coordination ability and flexible coordination mode.The hydrogen bond formed between aromatic carboxylic acids is a strong intermolecular force and has directionality and saturation,which plays a very important role in the self-assembly and regulation of aromatic carboxylic acids.In this review,we introduce surface organization formed by aromatic carboxylic acids with the aid of scanning tunneling microscopy(STM).These two-dimensional structures include molecular templates,host-guest systems,and photo-isomerization structures.We also emphasize the thermodynamics and dynamics,which are important research topics of current and future study.

Molecular Component Structures MediatedFormation of Self-assemblies

Molecular recognition directed self-assemblies from complementary molecular components, melamine and barbituric acid derivatives were studied by means of NMR, fluorescence, and TEM. It was found that both the process of the self-assembly and the morphologies of the result- ed self-assemblies could be mediated by modifying the structures of the molecular components used. The effect of the structures of the molecular components on the formation of the self-as- semblies was discussed in terms of intermolecular interactions.

Axially Chiral Dodecanuclear Lanthanide Clusters Constructed by“Bottom-Up” Self-assembly for Enantioselective Sensing

Via the bottom-up synthetic strategy,we synthesized a pair of dodecanuclear metal clusters of Eu_(12)(C_(2)O_(4))_(9)(R/S-BNP)_(18)(EtOH)_(6)-(H_(2)0)_(6)·8EtOH-7H_(2)0(complex 2),which represent the largest axial chiral lanthanide metal clusters.In the structure,rare four-pointed star coordination mode of oxalic acid is reported by this work.In addition,as a fluorescence sensor,the complex 2 exhibits high enantioselectivity for R-/S-BINOL-TF_(2)(EF=2.87)and other chiral binaphthyl derivatives.

Site-selection and recognition of aromatic carboxylic acid in response to coronene and pyridine derivative

The self-assembled structures of H_(3) BDA molecule with multiple meta-dicarboxylic groups and their stim-ulus responses to the guest molecules(COR and T4PT)are thoroughly investigated by scanning tunneling microscopy(STM).STM observations display that two kinds of nanostructures are fabricated by H3 BDA molecules through intermolecular hydrogen bonds,in which a linear structure is formed at a higher con-centration and a flower-like structure is obtained at a lower concentration.After the addition of COR and T4PT,H_(3) BDA appears different responsiveness resulting in different co-assembled structures,respectively.The linear structure is regulated into a flower-like structure by COR and COR molecules are trapped in the cavities.When the pyridine derivative(T4PT)is introduced,a new bicomponent porous structure emerges via the hydrogen bond formed between the carboxyl group and the pyridine.Furthermore,the deposition of additional COR to the H_(3) BDA/T4PT system results in the breakdown of the porous structure and the generation of H_(3) BDA/COR host-guest system.Combined with density functional theory(DFT)calculations and molecular dynamics(MD)simulations,the transformation phenomenon of bi-component nanostruc-ture induced by guest molecules is formulated.The results are expected to understand the modification effect of guest molecules on the host network,which is of great significance for the design and construc-tion of multi-component nanostructures and crystal engineering.

Molecular recognition of sulfonatocalixarene with organic cations at the self-assembled interface：a thermodynamic investigation

A microcalorimetric study on molecular recognition of p-sulfonatocalix[4]arene derivatives at selfassembled interface in comparison with in bulk water was performed,inspired by the dramatic change in physicochemical characteristics from bulk water to interface.A total of six cationic molecules were screened as model guests,including ammonium（NH_4~＋）,guanidinium（Gdm~＋）.N,N＇-dimethyl-1,4-diazabicyclo[2.2.2]octane（DMDABCO^（2＋））,tropylium（Tpm~＋）,N-methyl pyridinium（N-mPY＊） and methyl viologen（MV^（2＋））.The complexation with NH_4~＋.Gdm~＋ and DMDABCO2＊ is pronouncedly enhanced when the recognition process moved from bulk water to interface,whereas the complexation stabilities with Tpm~＋,N-mPY~＋ and MV2＊ increase slightly or even decrease to some extent.A more interesting phenomenon arises from the NH_4~＋/Gdm~＋ pair that the thermodynamic origin at interface differs definitely from each other although with similar association constants.The results were discussed in terms of differential driving forces,electrostatic,hydrogen bond as well as π-stacking interactions,originating from the unique physicochemical features of interfaces,mainly the polarity and dielectric constant.

利凡诺分子模板聚合物的吸附与识别特性研究

以利凡诺药物为模板分子，α－甲基丙烯酸为功能基单体，乙二醇二甲基丙烯酸酯为交联剂，选用分子模板技术，合成了一种新的具有类似于酶或药物受体结合部位为结构特征的分子模板聚合物．研究了它对利凡诺和其它底物的吸附特性和选择性识别能力．结果表明，与组成相同的非模板聚合物相比，利凡诺分子模板聚合物有较大的吸附性能和高度的选择性及识别能力．

久效磷分子印迹聚合物分子识别特性的光谱研究

采用分子印迹技术合成了对有机磷农药久效磷有高度选择性的聚合物,通过1H NMR和紫外光谱研究了印迹聚合物的结合机理和识别特性。结果表明,该聚合物通过协同氢键作用形成1∶2型氢键配合物专一地结合久效磷。聚合物红外光谱研究表明,聚合物表面存在可与印迹分子相互作用的官能团。

锌离子配位分子印迹聚合物的分子识别特性

以Zn(Ⅱ)和2,2′-联吡啶为模板,4-乙烯吡啶为功能单体,三烯丙基异氰脲酸酯为交联剂,采用分子印迹技术,合成了锌离子配位模板聚合物;系统研究了锌离子对聚合物识别的调节作用;平衡结合实验结果表明,乙酸锌(Ⅱ)在一定浓度条件下能显著提高聚合物对2,2′-联吡啶的选择性识别能力。

金属配位模板聚合物的分子识别特性的研究

以Ｃｏ（Ⅱ）和敌鼠配合物为模板，４－乙烯吡啶为功能基单体，乙二醇二甲基丙烯酸酯为交联剂，采用分子印迹技术，合成了具有类似于金属螯合抗体结合位点的金属配位模板聚合物。系统研究了金属离子对模板聚合物选择性结合敌鼠的调节作用。平衡结合实验结果表明，与化学组成相同的两种对比聚合物比较，乙酸钴（Ⅱ）在最佳浓度下可显著地提高模板聚合物对敌鼠的选择性识别能力。可望在环境、医学等研究领域获得实际应用。

芦丁-槲皮素双模板印迹聚合物的制备、表征及识别

以芦丁(RT)-槲皮素(QT)为混合模板分子制备了芦丁-槲皮素复合模板分子印迹聚合物。优化了制备条件,研究了模板用量比、功能单体及交联剂用量对印迹聚合物吸附性能的影响。用傅里叶红外光谱和扫描电镜对分子印迹聚合物进行结构表征。探讨了分子印迹聚合物的吸附动力学、等温吸附及键合位点特征,考察了其选择识别性能,并以分子印迹聚合物为吸附介质,萃取分离芦丁粗提液中的目标化合物。结果表明,当槲皮素与芦丁的摩尔比为3∶2,且模板总量与功能单体及交联剂用量摩尔比为1∶8∶10时,所得分子印迹聚合物的吸附性能最好,对槲皮素和芦丁的吸附量分别达47.86和60.97 mg/g。吸附可在3.5 h内达到平衡,显示了较快的吸附动力学。Scatchard分析表明,分子印迹聚合物基体中存在四类不同性能的键合位点,分别为芦丁和槲皮素的高亲和键合位点及非选择键合位点。相对分布系数(k=Kd(RT)/Kd(QT),Kd=qe/ρe,Kd为分布系数,qe为平衡吸附量,ρe为平衡质量浓度)大于1,表明了分子印迹聚合物对芦丁具有更高的选择键合作用,当模拟混合物中芦丁和槲皮素浓度分别为0.07和0.03 mmol/L时,相对分布系数和分离因子(α=qe(RT)/qe(QT))分别达6.669和25.02。另外,以乙腈、甲醇及甲醇-醋酸混合物依次为洗脱剂,通过分子印迹固相萃取可从槐米提取物中分离芦丁和槲皮素两种黄酮类化合物,总回收率分别为96.70%和94.67%。

分子印迹技术的研究与应用

分子印迹技术是一种制备具有分子识别功能的聚合物的新技术,介绍了分子印迹技术的基本原理与印迹聚合物的制备方法,综述了该技术在传感器、色谱、固相萃取、药物手性分离方面的研究与应用,并对未来的发展方向进行了展望。

Langmuir膜及LB膜中的金属参与

本文主要介绍了金属离子与Langmuir膜及LB膜相互作用中静电、配位等作用方式及其对膜相态和分子二维排列的影响。在此基础上探讨了Langmuir膜对金属离子的识别与传感。以Langmuir膜和LB膜为二维模板诱导无机盐定向生长作为金属/单分子膜结合的重要应用在文中也进行了讨论。通过举例展示了金属离子参与的Langmuir膜和LB膜催化有机反应的特点。最后对金属参与的Langmuir膜和LB膜在功能化和器件化等方面的研究也作了论述,并通过介绍金属螯合类脂分子的Langmuir膜在蛋白质等生物大分子界面定向聚集研究中的应用表明了金属参与的Langmuir膜及LB膜在生命科学研究中的意义。全文贯穿了金属结合调节Langmuir膜和LB膜组装结构以及通过金属结合导入功能基团进行有序组装的思想。

分子识别在分析化学中的应用

本文概述了分子模板理论的产生和发展,总结了分子模板技术在分析化学领域中的应用和发展趋势.同时对分子印渍技术的理论进行概述,并指出分子印渍技术在分析化学领域中的应用和发展情况.阐述了分子模板和分子印渍技术在分子识别分析方面的应用前景,其将为各种物质的超微量分析提供更加讯捷、准确、方便的分析方法.

分子印迹技术及其在生物领域内的应用

分子印迹技术是近十年来发展起来的模拟抗体 -抗原相互作用原理的新技术。在存在印迹分子的条件下 ,通过模板聚合可以构造出具有选择性识别位点的印迹聚合物。该聚合物可作为用于生物物质的监测、分析、分离与纯化等的基质。本文就分子印迹技术的产生、发展及其在生物领域中的应用做了较为详细的阐述 。

分子印迹技术及其应用研究进展

分子印迹技术是 2 0世纪 90年代迅速发展起来的一种化学分析技术 ,属于超分子化学研究范畴 ,通常被人们描述为制造识别“分子钥匙”的人工“锁”技术。它在化学仿生传感器、模拟抗体、模拟酶催化、膜分离技术、色谱中对映体和位置异构体的分离、固相提取、临床药物分析等领域展现了良好的应用前景。本文就分子印迹技术的产生、分析原理和应用研究进展进行综述。

选择性分离铜的分子模板聚合法优选条件的研究

以苯酚、甲醛、四乙烯五胺为反应单体，优化一系列反应条件，合成出对铜具有很高选择吸附能力的分子模板聚合物，对其动态选择吸附能力进行了验证，结果满意．

分子与纳米自组装材料的研究进展

对近年来分子与纳米自组装材料方面的研究进行了总结,分别从小分子自组装、大分子自组装、纳米自组装三个方面进行综述,展示了该领域的一些重要进展和研究结果的应用前景。