琉基叶琳自组装单分子膜的制备及表征研究外文翻译资料

 2022-12-25 14:21:07

Preparation and characterization of self assembled monolayers of ryukyl

Abstract:

This thesis is based on the excellent photoelectric properties and stability of Ye Lin compounds, and the sparse base of Ye Lin.

The sulfur atom in the metal and gold junction can synthesize the strong total valence bond and construct the self assembled monolayer on the gold electrode. The domestic and foreign research of Ye Lin and its derivatives, molecular self-assembly membranes and molecular electronic devices are reviewed.

The self-assembled monolayers and their surface properties have been proposed based on the sparse base and the metallized lobes.

Topic selection of academic dissertations. By self-assembled method, the monolayer of the four phenyl leaf Linden one open and metallized Ryukyu four phenyl linlin1 was prepared on gold surface, and the characterization of cyclic voltammetry, AC impedance, scanning electrochemical microscopy and contact angle were carried out. The results show that a highly ordered self-assembled monolayer can be formed on the gold surface. On the other hand, the electron transfer from the surface of the gold electrode to the solution is hindered by the insulation of the alkyl chain, and the impediment effect of the electron transfer increases with the increase of the alkyl chain. However, when the metal ions were inserted in the center of the ryukyl forest, the increase of the electron transfer made the reduction peak of the Au electrode obviously increased. The increased electron transfer ability can understand the insertion of metal ions in two aspects, which leads to the distortion of the leaf linen, and the structure of metal Ye Lin plays a vital role in the process of electron transfer.

The insertion of the electrons increases the possibility of tunneling. We used Ye Lin derivative - 41 (1, 1, 4 -) - propanoxy phenyl - Elin as the research object. The molecular self-assembly of four Ryukyu molecules was used as the model of the multi claw leaf Lynn molecule, and compared with the corresponding mono - ryukyn leaf - Lin as a single 'claw' model self - assembly membrane. At the same time, molecular devices were assembled on the gold nanoscale gap electrode, and the feasibility of the application of self assembled monolayers of sparsine and its derivatives on molecular devices was investigated by measuring and characterizing the UV visible spectrum, the contact angle and the contact angle of the monolayer on the gold surface. The results show that the molecules are assembled on the surface of the substrate by the inclination angle, and the self-assembled nannode of the molecule and the nonlinear current voltage curve are produced by the gold nanoscale electrode. It shows that the current may be injected into the molecule from the gold electrode by the nano tunneling effect. With the opening and closing of the light source, the nanoscale junction can be converted between low and high resistance states, and the nanometer level photoelectric switch is made. So far, the self - assembly of mono - sparse leaf lineline has been mainly focused on, so the self - assembly of many 'claw' leaf linelyn molecules, that is, four Ryukyu leaf lynline, and their results constitute the innovation of this dissertation.

Keywords: Ye Lin, self assembly, monolayer, electrochemistry, nanoscale junction

Progress in the research of Ye Lin compounds

Ye Lin is the core part of the macromolecular structure, such as heme, cytochrome and chlorophyll, and plays a special role in the transmission of energy, information and oxygen in life activities in nature. Ye Lins special two-dimensional common windlass structure and its molecular structure, the diversity of its molecular structure, the easy to cut, the high stability of light and heat, and the complexing properties of various metal atoms have attracted wide attention and become a hot topic in the study of electrochemistry. The introduction of metal ions gave Ye Lin a more obvious electrocatalytic activity. Usually, Ye Lin and metal salts are refluxing in organic acid acetic acid to get metal leaf Lin. In addition, the voltammetry of solid particles can also directly obtain metal leaf linen on the electrode surface. The study of leaf compounds has great significance and broad prospects for the photosynthesis of green plants, the development of renewable energy solar energy, medical devices and drug synthesis, industrial catalysts and so on. The following aspects may be a hot field in the research of leaf compounds. The model of the oxidation process within the organism is due to the particularity of the structure of metal Ye Lin complexes. Some special biochemical reactions can occur, which can be used as an analog model for the reaction mechanism of organisms. The disease diagnosis and treatment of some leaf linen compounds can give priority to the absorption and retention of malignant tumor, which is used as the photosensitive reagent of leaf linen and laser to make contributions to human conquest of cancer. Photoconversion of Ye Lin compounds has the electrocatalytic reduction of molecular oxygen, so it can be used as photocathode for photoelectrochemical cells. Environmental protection metal leaf compounds have catalytic oxidation of organic compounds, and the most prominent is the catalytic oxidation of metal leaf compounds used to eliminate pollution special catalytic systems, which will be beneficial to the construction of a new chemical synthesis catalytic system. Introduction to the structure and classification of Ye Lin compounds: Ye Lin is a general term for a class of macrocyclic compounds having substituents on the leaf ring. It was first proposed in the first year, with the structure of the large ring of the 'four adjoining' structure, which was considered unstable and not recognized by people until the structure was confirmed by and synthesis of the chloro ferri

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琉基叶琳自组装单分子膜的制备及表征研究

摘要：

位论文基于叶琳类化合物具有优异的光电特性和稳定性、以及疏基叶琳中的硫原子能和金结合成牢固的一共价键而在金电极上构筑自组装单分子膜发展前景,综述了叶琳及其衍生物、分子自组装膜以及分子电子器件的国内外研究进展,提出了以疏基叶琳和金属化疏基叶琳自组装单分子膜及其表面性质研究的学位论文选题。通过自组装的方法,在金表面制备了疏基四苯基叶琳一开和金属化琉基四苯基叶琳一的单分子膜,并进行循环伏安、交流阻抗、

扫描电化学显微镜和接触角的表征研究。结果表明,和一开可以在金表面形成高度有序的自组装单分子膜。一仰的会因烷基链的绝缘性质而阻碍金电极表面到溶液中的电子传递、且电子传递的阻碍效应会随烷基链增长而增加。然而,当在琉基叶琳中心插入金属离子之后,电子传递增加的又使得金电极上【哟广的还原峰有明显的增高。所增加的电子传递能力可以从两方面来理解金属离子的插入导致了叶琳分子的扭曲,而金属叶琳的结构在电子传递过程中起到了至关重要的作用金属离子的插入增加电子发生隧穿的可能性。采用叶琳衍生物—四一【一一疏基丙氧基苯基叶琳作为研究对象。利用分子的四个琉基作为多“爪”叶琳分子的模型进行分子自组装,并与相应的单琉基叶琳作为单“爪”模型自组装膜比较。同时,在金纳米间隙电极上组装分子得到分子器件,通过组装在金表面的单分子膜紫外一可见光谱、、、、接触角和的测试及表征,考察了疏基叶琳及其衍生物自组装膜在分子器件领域应用的可行性。结果表明,分子在以的倾角组装在基底表面形成,用金纳米间隙电极制得了分子的自组装纳米结、纳米结显示出非线性的电流一电压曲线,说明电流可能是借助纳米隧穿效应从金电极向分子注入的。随着光源的开合,纳米结可以在低高阻态间转换从而制得了纳米级别的光电开关。迄今研究报道基本集中单疏基叶琳自组装方面,故多“爪”叶琳分子、即四琉基叶琳分子的自组装研究及其结果构成本学位论文的创新点。

关键词：叶琳,自组装,单层膜,电化学,纳米结

叶琳类化合物研究进展

叶琳是血红素、细胞色素和叶绿素等生物大分子结构的核心部分,在自然界生命活动的能量、信息和氧气的传送过程中起特殊作用。叶琳特殊的二维共辘兀电子结构及其分子结构的多样性、易裁剪性,以及对光、热的高稳定性和对多种金属原子配位络合特性等,引起人们的广泛关注,也成为电化学研究的热点课题川。金属离子的引入使叶琳具有更明显的电催化活性。通常,将叶琳与金属盐在有机酸醋酸中回流便可得到金属叶琳。此外,固体微粒伏安法亦可在电极表面直接获得金属叶琳。叶琳化合物的研究对于绿色植物的光合作用、可再生能源太阳能的开发、医疗器械及药物合成、工业催化剂等领域都有重大意义和广阔的前景。下述几方面也许是叶琳化合物研究的热点领域生物体内氧化过程的模型由于金属叶琳配合物结构的特殊性,能发生某些特殊生物化学反应,可作为生物体某些反应机理问题的模拟模型。疾病诊断与治疗一些叶琳化合物都能优先为恶性肿瘤吸收和滞留,作为叶琳光敏试剂与激光结合加以应用,向人类征服癌症作出贡献。光电转换叶琳化合物具有分子氧的电催化还原性,故可作为光电化电池的光阴极。环境保护金属叶琳化合物对有机化合物具有催化氧化的作用,其中最突出的是用以消除的污染特殊催化体系金属叶琳化合物的催化氧化特性将有利于构建新型化学合成催化体系。叶琳类化合物的结构及分类简介叶琳是在叶吩环上拥有取代基的一类大环化合物的总称。最早是年由首次提出的,其结构为大环的“四毗咯”结构,当时被认为该结构是不稳定的而未被人们认可,直到年由和合成了氯高铁叶琳,其结构才被证实。叶琳分子母体叶吩则是由个毗咯环和个次甲基桥相互联起来的大键共扼体系,叶吩自由碱的骨架结构

叶琳类化合物的合成

自年和首次合成了血晶素之后,人们对叶琳类化合物的合成进行了广泛的研究。在年将苯甲醛和毗咯于℃下回流一后首次合成了四苯基叶琳即仰,但该方法合成产率低且在此反应条件

下能用作反应物的取代苯甲醛也很有限。等人于年改进了的方法,采用丙酸作溶剂,将苯甲醛和毗咯在℃下回流得到四苯基叶琳。但由于该法在酸性介质中合成,易生成副产物四氢叶琳仰而造成目标产物与副产物不易分离。在年,进一步改进了上述四苯基叶琳的合成方法,该法产率较高,达一左右,其缺点是反应需氮气保护,合成步骤复杂。中国化学家郭灿城采用作溶剂,无水作催化剂,产率可达,该法不生成副产物仰,适用范围广。在大量合成具有不同结构的叶琳化合物的同时,金属叶琳配合物的研究在国内外也受到广泛的重视。由于叶琳所具有的大环结构和多齿配位作用,使得叶琳与金属尤其是过渡金属离子形成的配合物有独特的物理化学性质。此类化合物往往被作为新型的催化剂和光电功能材料被广泛应用于化学工业以及材料科学领域,而且在自然界也发挥着重要的作用。实际上在自然界广泛存在的叶绿素、血红素、维生素等都是金属叶琳化合物。如起氧化传递作用的血红蛋白、电子传递和氧活化作用的细胞色素、细胞色素一及起酶催化作用的过氧化氢酶等都是金属铁叶琳化合物,叶绿素是金属镁叶琳化合物,维生素是金属钻叶琳化合物等等。可见,没有金属叶琳化合物就没有自然界中动植物的生命,因此研究金属叶琳化合物不仅可以揭示此类化合物的结构与性质特征之间的关系,而且还可有助于探索生命科学的重要生物过程研究。大多数研究工作主要集中在过渡金属如铁、钻、镍、锌等金属上,这些化合物己广泛应用于食品、医药领域,如作食品添加剂和医学上用来治疗肝、胃等疾病以及诊治肿瘤的标记物等。由于叶琳环类衍生物的特殊功能尤其铁叶琳、钻叶琳和叶绿素铜钠等在临床上的广泛应用,使得金属叶琳配合物的应用研究有着很好的发展前途。因此,通过改变叶琳环中心金属离子的种类,可能合成具有特殊功能的金属叶琳配合物。

自组装膜的表征研究方法

目前有很多技术和方法被广泛应用于自组装单分子膜的表征,大致可分为以下两种,即电化学方法和非电化学方法也可称之为物理方法。电化学方法表征是通过研究探针分子与电极表面修饰剂发生相关的电化学反应的电流、电量、电位和电解时间等参数间的关系来定性、定量地表征自组装膜的方法。电化学方法可以方便快捷地给出有关的界面结构和性质的直接信息。其中由电容法、阻抗法可获得膜电容、膜电阻等信息。常见的电化学方法主要有以下几种循环伏安法法。循环伏安法表征又可分为电容表征法、阻碍效应表征以及还原解析表征等。例如利用电容表征法对金电极表面的琉基叶琳自组装膜的表征,由于膜电极的电容随膜的厚度线性减小,所以可利用这一关系对电极表面形成的自组装膜进行表征。实际上,循环伏安法在众多的表征膜结构方法中是一种较灵敏的电化学方法,主要是因为该方法能够直接给出关于膜结构中存在的针孔和膜的缺陷等信息。董绍俊等人利用循环伏安法结合膜的阻碍效应对金电极表面的自组装膜进行了电化学表征。等人珠用烷基硫醇的解析还原对其在金电极表面形成的自组装膜进行了表征,通过连续扫描可以得出烷基硫醇在溶液中的逐步解离,该法不仅可以用来表征膜的形成,还可用于处理电极等进一步的应用。

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