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偶氮苯衍生物自组装膜的表征及组装动力学 总被引:6,自引:0,他引:6
报导了4-正辛基-4′-(3-巯基丙氧基)偶氮苯(简称C8AzoC3)自组装膜(Self-AssembledMonolnyersSAMs)的表征及其自组装成膜动力学,接触角滴定、原子力显微镜(AFM)及电化学的实验结果表明,C8AzoC3分子在金表面自组装形成致密有序的流水性单分子膜,并且在电极上没有明显的电化学响应.通过控制组装时间,考察了偶氮苯自组装形成单分子膜的动力学过程,从接触角和电化学数据得到组装过程的速率常数kad为(1.2±0.2)×103mol-1·dm3·s-1;依据不同组装时间形成的自组装膜的特征循环伏安行为,提出了C8AzoC3分子在金表面自组装过程的动态模型. 相似文献
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偶氮兹及其衍生物具有独特的光致异构化和电化学反应机制,其LB单分子膜作为一种高度有序的分子组装体系,以其诱人的应用前景引起了人们的极大兴趣.然而在这方面的研究中,LB膜通常是沉积在SnO。或镀金的基片上,其结构的相对木稳定性限制了实际应用的可能性.我们利用自组装技术,在金基底表面组装了具有特定末端基团的自组装单分子膜,然后利用LB技术构造偶氮苯衍生物的单分子膜,以期得到稳定而有序的偶氮苯LB膜,且不影响其光化学和电化学活性.本文报道了这种新型偶氮苯自组装一LB组合股的结构表征及其电化学行为.亚实验部分偶… 相似文献
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通过共价键连接的方式在亲水性基底上制备了刚性功能分子3,4,9,10- NFDA1 四羧酸的自组装单分子膜,利用接解角、紫外-可见光谱、电化学循环伏安等方法对所制备的NFDA1 四羧酸自组装膜进行了表征,并初步研究了该自组装膜在ITO电极表面光电转换性质. 相似文献
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硫醇分子链长对氧化还原自组装多层膜电化学行为影响的初步研究(英文) 总被引:1,自引:0,他引:1
以烷基硫醇和二茂铁衍生物构建的氧化-还原自组装多层膜为模型体系,研究烷基硫醇分子链长对多层膜电化学行为的影响.实验表明,二茂铁基团和电极之间的电子传递反应速率随两者距离的增加呈现指数级下降的趋势;烷基硫醇分子链长对自组装膜电化学行为的影响于不同情况下表现不同.本实验条件下,当多层膜上的电活性基团与电极比较接近时,长链分子自组装膜呈现较强的电化学响应.而当电极与电活性基团之间的距离较远时,短链烷基硫醇分子自组装膜呈现较强的电化学响应. 相似文献
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自组装超分子膜修饰电极的研制及分析应用 总被引:4,自引:0,他引:4
阐述了自组装超分子膜修饰电极的发展概况及超分子体系形成的理论基础,并对自组装超分子膜修饰电极的特点、电化学行为、功能膜的制备和表征方法以及它在电催化、生物传感器、离子选择性电极等方面的应用进行了综述。 相似文献
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研究了芳香席夫碱的设计合成、界面相行为以及与铜离子的配位过程,并与离位合成的铜复合物的界面组装行为进行了对比.利用表面压-面积等温线、紫外光谱、红外光谱、原子力显微镜等一系列实验方法来详细表征组装膜.结果表明,席夫碱配体与铜复合物均可在气液界面上形成稳定的有序组装膜,并可以转移到固体基片上构筑多层膜.进而,席夫碱配体在纯水界面上表现出奇特的相变.在相变点前后,二维的平膜变化成了三维的纤维状组装结构.然而,对于铜离子亚相上的组装过程却没有出现较大的变化.两者之间明显的差异可归因于在气液界面超分子组装过程中的分子构型以及疏水性能的不同引起的.目前的工作为制备和调控有序组装膜提供了有益探索. 相似文献
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二茂铁硫醇自组装膜的电化学行为及其离子对效应 总被引:5,自引:4,他引:5
详细了研究10-二基铁-1-癸硫醇(HSC10Fc)在金基底上形成的自组装单分子膜的电化学行为,发现HSC10Fc在金基底上形成稳定的自组装膜,并且在0.1mol/L的HClO4溶液中表现出可逆的氧化还原行为,但其氧化还原峰的峰形和峰位极易溶液中阴离子种类和浓度的影响,考察了二茂铁自组装膜及通过后置换形成的二茂铁硫醇/十二烷基硫醇混合膜在混合电解液中的电化学行为,直接比较了两种不同阴离子与二茂铁阳 相似文献
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Najat Aburas Aleksandar Loli? Nikola Stevanovi? Tatjana Tripkovi? Sne?ana Nikoli?-Mandi? Rada Bao?i? 《Journal of the Iranian Chemical Society》2012,9(6):859-864
This study describes the effects of the substituents on electrochemical behavior and antioxidant activity of the six tetradentate Schiff bases, containing ethane-1,2-diamine or propane-1,2-diamine as the amine part and pentane-2,4-dione and/or 1-phenylbutane-1,3-dione as ??-diketone, and corresponding copper(II) complexes. Cyclic voltammograms of these compounds were recorded in dimethylsulfoxide and 0.1?M sodium perchlorate as supporting electrolyte with glassy carbon as working electrode at different scan rates. The voltammograms of Schiff bases alone showed only one irreversible peak. Voltammograms recorded for complexes showed the presence of quasi-reversible processes taking place at the metal center and reversible process at the ligand part. Both steric and inductive effects of substituents and structure of imine bridge of Schiff base ligands as well as complexes were discussed. These effects appear relevant for the antioxidant activity. Antioxidant activity of the investigated compounds expressed as Trolox equivalent antioxidant capacity is also discussed. The electrochemical behavior showed a high correlation with the antioxidant activity for investigated compounds. 相似文献
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The electrochemical reduction of p-nitrophenyl sulfenyl chloride, o-nitrophenyl sulfenyl chloride as well as bis(4-nitrophenyl) disulfide and bis(2-dinitrophenyl) disulfide was investigated in acetonitrile at an inert electrode. Reduction standard potentials as well standard heterogeneous electron-transfer rate constants have been determined using convolution analysis. An unexpected big difference in the thermodynamics and kinetics of the initial electron-transfer process as well as a striking change in the reductive cleavage mechanism of the S-Cl bond as a function of the nitro group position on the aryl ring of the aryl sulfenyl chloride is observed. A computational study at the B3LYP level shows that this difference in behavior is due to the through-space nonbonded S...O interaction in the o-nitrophenyl sulfenyl chloride. 相似文献
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研制了Nafion-N,N′-双(3-羧基邻羟亚苄基)三亚甲基二胺(Schiff碱)化学修饰电极;研究了电极的伏安特性,探讨了电极反应机理;用红外光谱证实了Hg(Ⅱ)与Schiff碱的可配位性,该电极用于微分脉冲阳极溶出伏安法测定未处理的尿样中痕量汞,较玻碳电极具有更高的灵敏度和较好的抗表面活性物质干扰的能力。 相似文献
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The poisonous intermediate of methanol oxidation on a Pt electrode was validated to be CO(ad) by electrochemical method. An approximate treatment to bimolecular elementary reactions on an electrode was advanced and then was applied to the stripping normal pulse voltammetry (NPV) for complex multistep multielectron transfer processes on plane electrodes to study the kinetics of completely irreversible process of CO(ad) oxidation to CO2. The kinetic parameters for this process, such as standard rate constant (k0) and anodic transfer coefficient (alpha) for this irreversible heterogeneous electron-transfer process at electrode/solution interface and apparent diffusion coefficient (D(app)) for charge-transfer process within the monolayer of CO(ad) on electrode surface, were obtained with stripping NPV method. The effect of the approximate treatment on the kinetic parameters was also analyzed. 相似文献
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研究了在有机胶凝剂中掺杂的席夫碱化合物的结构和性质. 实验发现, 虽然席夫碱分子单独不能在有机溶剂中形成凝胶, 当其与一种胶凝剂N,N’-双十八烷基-L-Boc-谷氨酸混合时, 它们在二甲基亚砜或甲苯中形成透明的有机凝胶. 与相应的溶液相比, 观察到在有机凝胶中的荧光增强现象, 并且这一增强与席夫碱的结构有密切关系. 在二甲基亚砜的有机凝胶中, 观察到带有长烷基链的席夫碱具有诱导手性. 表明通过凝胶的形成, 胶凝剂的手性能传递到带有长链的席夫碱上. 相似文献
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The structures and properties of some Schiff base compounds doped in organogels were investigated. It was found that although individual Schiff bases could not form organogels with organic solvents, they can gel by mixing with an organogelator, N,N′-bisoctadecyl-L-Boc-glutamic-diamide, which formed transparent organogels in dimethyl sulfoxide (DMSO) or toluene (Tol). The enhancement of doping Schiff bases fluorescence in the organogel was observed in comparison with that of the corresponding solution. Furthermore, in the DMSO organogel, the induced chirality was obtained from the doping Schiff base with long alkyl chain. In contrast, the Schiff bases without long alkyl chain could not form supramolecular chiral assemblies in organogel. It was suggested that through gel formation the chirality of the gelator could be transferred to the Schiff base through hydrophobic interaction among the long alkyl chains. 相似文献
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两种二茂铁巯基化合物的合成表征及其修饰金电极电化学性质的研究 总被引:1,自引:0,他引:1
通过二茂铁甲醛与两种胺在无水乙醇中缩合,合成了两种新型的含有巯基的二茂铁基的Schiff碱,同时研究了两种新型二茂铁巯基化合物修饰金电极的电化学性质. 相似文献
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S. Majdi A. Jabbari H. Heli H. Yadegari A. A. Moosavi-Movahedi S. Haghgoo 《Journal of Solid State Electrochemistry》2009,13(3):407-416
The electrochemical behavior of ceftriaxone was investigated on a carbon-nanotube-modified glassy carbon (GC-CNT) electrode
in a phosphate buffer solution, pH = 7.40, and the results were compared with those obtained using the unmodified one [glassy
carbon (GC) electrode]. During oxidation of ceftriaxone, an irreversible anodic peak appeared, using both modified and unmodified
electrodes. Cyclic voltammetric studies indicated that the oxidation process is irreversible and diffusion-controlled. The
number of electrons exchanged in the electrooxidation process was obtained, and the data indicated that ceftriaxone is oxidized
via a one-electron step. The results revealed that carbon nanotube promotes the rate of oxidation by increasing the peak current.
In addition, ceftriaxone was oxidized at lower potentials, which thermodynamically is more favorable. These results were confirmed
by impedance measurements. The electron-transfer coefficients and heterogeneous electron-transfer rate constants for ceftriaxone
were reported using both the GC and GC-CNT electrodes. Furthermore, the diffusion coefficient of ceftriaxone was found to
be 2.74 × 10−6 cm2 s−1. Binding of ceftriaxone to human serum albumin forms a kind of electroreactive species. The percentage of interaction of
ceftriaxone with protein was also addressed. A sensitive, simple, and time-saving differential-pulse voltammetric procedure
was developed for the analysis of ceftriaxone, using the GC-CNT electrode. Ceftriaxone can be determined with a detection
limit of 4.03 × 10−6 M with the proposed method. 相似文献