Electrostatic Repulsion-Induced Desorption of Dendritic Viologen-Arranged Molecules Anchored on a Gold Surface through a Gold-Thiolate Bond Leading to a Tunable Molecular Template
Electrostatic Repulsion-Induced Desorption of Dendritic Viologen-Arranged Molecules Anchored on a Gold Surface through a Gold-Thiolate Bond Leading to a Tunable Molecular Template
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通过金-硫醇盐键锚定在金表面的树枝状紫罗碱排列分子的静电排斥诱导解吸，形成可调节的分子模板
DOI：
10.1021/acs.langmuir.8b00858
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Tomokazu Iyoda
中科院分区：
文献类型：
--
作者：
Takehiro Kawauchi;Takahiro Kojima;Hiroshi Sakaguchi;Tomokazu Iyoda
本文研究了在极性溶剂中，以ω-巯基癸基（An，n = 0-3）为顶点的树枝状紫精分子为模板分子的自组装单分子膜（SAMs）在金表面的吸附和脱附行为。的树枝状分子的吸附发生迅速，并在几分钟内饱和的乙腈/乙醇（1/1，v/v）混合物中，在2 mM的浓度。原子力显微镜图像的自组装膜显示平坦的表面，无论树枝状代，因为周边紫精单位紧密堆积在分子层的表面。通过扫描隧道显微镜测量混合SAM与癸醇的混合物，观察到固定在基底上的单个A3分子。研究了树枝状分子在水等溶剂中的脱附行为。An-SAM的自发脱附比常规的正烷基乙氧基化SAM发生得更快。然而，通过添加电解质如NaNO 3抑制解吸由于屏蔽效应的静电排斥之间的树枝状分子。这些结果表明，树枝状分子的表面密度可以通过脱附来控制。
We investigated the adsorption and desorption behavior of self-assembled monolayers (SAMs) on gold derived from dendritic viologen-arranged molecules with an ω-mercaptodecyl group (An,n(dendritic generation) = 0–3) at the apex of the dendritic structure in polar solvents. The adsorption of the dendritic molecules occurred quickly and saturated within a few minutes in an acetonitrile/ethanol (1/1, v/v) mixture at a concentration of 2 mM. Atomic force microscopy images of the SAMs showed flat surfaces regardless of the dendritic generation because the peripheral viologen units were closely packed at the surface of the molecular layer. IndividualA3molecules immobilized on the substrate were observed by scanning tunneling microscopy measurements of a mixed SAM with decanethiol. The desorption behaviors of dendritic molecules from theAn-SAMs in several solvents such as water were also investigated. The spontaneous desorption of theAn-SAM occurred more rapidly than that of a conventionaln-alkanethiol SAM. However, the desorption was inhibited by adding electrolytes such as NaNO3due to the shielding effect on the electrostatic repulsion between the dendritic molecules. These results indicate that the surface density of the dendritic molecules can be controlled through the desorption.