EPR OF ALKYLTHIO MODIFIED GOLD COLLOID

用后续的方法制备了几种金胶体体系 长链硫醇单分子膜在其表面的吸附。 由此得到的单层膜具有高度有序的链长 10个碳单位或更多。观察到了不同寻常的拉曼光谱 从这些薄膜中，出现了一系列新的拉曼光谱，以获得更长的链 电影(NC&GT；10)，与电影直接相关 结晶度。此外，这些波段仅在 激发波长在620-720范围内的拉曼光谱 在这个范围之外，正常的群振动频率 这部电影是唯一观察到的乐队。共鸣过程 与这些拉曼光谱相关的谱带似乎起源于Au/S 界面区和当前的界面结构模型 支持多硫物种在全球范围内的形成 化学吸附的烷基硫醇。多硫链预计将是 双自由基，以及一种自由基物种的存在可以解释 光学式 到目前为止，吸收显示为红色。因此，我们的目标是 确定聚硫醚(或任何自由基物种)是否 Essence)由EPR在电影中呈现。

Several Au colloidal systems have been prepared by subsequent adsorption of long-chain alkanethiol monolayers on their surfaces. The resulting monolayer films are highly ordered for chain lengths of 10 carbon units or greater. Unusual Raman spectra have been observed from these films; a series of new Raman bands appears for longer chain films (nc>10), which has been directly correlated to film crystallinity. In addition, these bands are only observed in the Raman spectra when the excitation wavelength is in the range 620-720 nm; outside this range, the normal group vibrational frequencies of the film are the only bands observed. The resonance process associated with these Raman bands appears to originate from the Au/S interfacial region, and current models of interfacial structure support the formation of polysulfur species at the headgroups of the chemisorbed alkanethiols. Polysulfur chains are expected to be diradicals, and the presence of a radical species would explain the optical absorption appearing so far in the red. Our goal therefore is to ascertain whether or not polysulfur (or any radical species in essence) is present within the film by EPR.