Assembly of dithiocarbamate-anchored monolayers on gold surfaces in aqueous solutions.

Assembly of dithiocarbamate-anchored monolayers on gold surfaces in aqueous solutions.
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在水溶液中将二硫代氨基甲酸盐锚定的单层组装在金表面上。

DOI:
10.1021/la801254b
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发表时间:
2008-08-19
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
Wei A
Wei A
中科院分区:
其他
文献类型:
--
作者:
Zhu H;Coleman DM;Dehen CJ;Geisler IM;Zemlyanov D;Chmielewski J;Simpson GJ;Wei A

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二硫代氨基甲酸盐(DTC)可以通过极性烷基胺与CS2的原位缩合形成,并在水溶液中组装成二硫代氨基甲酸盐锚定的单分子层(DAM)。伯胺和仲胺均可用于制备DTC,但其反应活性和产品稳定性存在显着差异。紫外吸收光谱为监测原位 DTC 形成以及潜在副产物的形成提供了一种便捷的方法。通过二次谐波发生 (SHG) 测量的 Au 基底上 DAM 组装的动力学表明,其一级速率过程和饱和覆盖范围与 Au 上的链烷硫醇相似。然而,吸附速率并没有按照 Langmuir 动力学预期的方式随 DTC 浓度变化,这归因于烷基铵抗衡离子对新氧化的 Au 底物的竞争吸附。这些分析建立了使用原位 DTC 形成从极性胺制备 DAM 的实用条件范围。
Dithiocarbamates (DTCs) can be formed by the in situ condensation of polar alkylamines with CS2, and assembled into dithiocarbamate-anchored monolayers (DAMs) on Au substrates in aqueous solutions. Primary and secondary amines can both be used to prepare DTCs, but have significant differences in their reactivities and product stabilities. Ultraviolet absorption spectroscopy provides a convenient method for monitoring in situ DTC formation as well as the formation of potential byproducts. The kinetics of DAM assembly on Au substrates as measured by second harmonic generation (SHG) indicated first-order rate processes and saturation coverages similar to those of alkanethiols on Au. However, the rate of adsorption did not change with DTC concentration in a manner expected of Langmuir kinetics, and is attributed to the competitive adsorption of alkylammonium counterions to the freshly oxidized Au substrate. These analyses establish a practical range of conditions for preparing DAMs from polar amines using in situ DTC formation.
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影响因子: 3.9
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