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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Tripodal Binding Units for Self-Assembled Monolayers on Gold: A Comparison of Thiol and Thioether Headgroups
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Tripodal Binding Units for Self-Assembled Monolayers on Gold: A Comparison of Thiol and Thioether Headgroups

机译：自组装单层金的三脚架结合单元：硫醇和硫醚头基的比较。

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摘要

Whereas thiols and thioethers are frequently used as binding units of oligodentate precursor molecules to fabricate self-assembled monolayers (SAMs) on coinage metal and semiconductor surfaces, their use for tridentate bonding configuration is still questionable. Against this background, novel tridentate thiol ligands, PhSi(CH2SH)3 (PTT) and p-Ph-C6H4Si(CH2SH)3 (BPTT), were synthesized and used as tripodal adsorbate molecules for the fabrication of SAMs on Au(111). These SAMs were characterized by X-ray photoelectron spectroscopy (XPS) and near edge X-ray absorption fine structure (NEXAFS) spectroscopy. The PTT and BPTT films were compared to the analogous systems comprised of the same tripodal ligands with thioether instead of thiol binding units (anchors). XPS and NEXAFS data suggest that the binding uniformity, packing density, and molecular alignment of the thiol-based ligands in the respective SAMs are superior to their thioether counterparts. In addition, the thiol-based films showed significantly lower levels of contamination. Significantly, the quality of the PTT SAMs on Au(111) was found to be even higher than that of the films formed from the respective monodentate counterpart, benzenethiol. The results obtained allow for making some general conclusions on the specific character of molecular self-assembly in the case of tridentate ligands.
机译：尽管硫醇和硫醚经常用作寡齿前体分子的结合单元，以在造币金属和半导体表面上制造自组装单分子层（SAM），但它们在三齿键合构型中的用途仍然令人怀疑。在此背景下，合成了新型三齿硫醇配体PhSi（CH2SH）3（PTT）和p-Ph-C6H4Si（CH2SH）3（BPTT），并将其用作三脚架吸附物分子，用于在Au（111）上制备SAM。这些SAM通过X射线光电子能谱（XPS）和近边缘X射线吸收精细结构（NEXAFS）光谱进行了表征。将PTT和BPTT薄膜与由相同三脚架配体组成的类似系统进行比较，该配体具有硫醚而不是硫醇结合单元（锚）。 XPS和NEXAFS数据表明，相应SAM中硫醇基配体的结合均匀性，堆积密度和分子排列均优于其硫醚对应物。此外，基于硫醇的薄膜显示出较低的污染水平。值得注意的是，发现Au（111）上PTT SAM的质量甚至比由相应的单齿对应物苯硫醇形成的薄膜的质量还要高。在三齿配体的情况下，获得的结果可以对分子自组装的特定特征做出一些一般性结论。

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