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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >XPS, FTIR-ATR, and AFM Structural Study of Silicon-Grafted Triol Monolayers for Controlled Anchoring of Single Molecule Magnets
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XPS, FTIR-ATR, and AFM Structural Study of Silicon-Grafted Triol Monolayers for Controlled Anchoring of Single Molecule Magnets

机译：硅接枝三醇单分子膜用于单分子磁体可控锚定的XPS，FTIR-ATR和AFM结构研究

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摘要

The structures of monolayers on Si(100) made up of two acetyl-protected triol ligands, derived from 2-hydroxymefhyl-propane-1,3-diol, namely, R-C(CH2OAc)3 with R = CH2=CH-(CH2)9-O-CH2- and R = CH2=CH-(CH2)7-, have been investigated. After deprotection, the two ligands are well-suited receptors for anchoring molecular functionalities, such as Fe4 single molecule magnets, to the Si surface through OH groups. Monolayers were obtained by the hydrosilylation reactions between H-terminated Si(100) and the CH2=CH- end groups and were prepared in pure form or diluted with inert 1-alkenes to achieve an accurate control over the concentration and concerted orientation of the receptors on the surface. Subsequent anchoring of a Fe4 cluster, especially designed for a vertical atom sequence, has been expedient to clarify the influence of ligand mole, fraction on the ordering of molecular receptors. We have achieved insight into the related structures and morphologies by combining angle-resolved X-ray photoelectron spectroscopy (AR-XPS), FTIR-attenuated total reflection (ATR) spectroscopy, and atomic force microscopy (AFM), including force lithography experiments. There is evidence that steric hindrances of apical groups are crucial for surface concentrations and, in turn, for geometrical orientation of the tethering units. Aging effects on monolayer structures and possible recovery processes have also been evaluated.
机译：Si（100）上的单分子层结构由两个乙酰基保护的三醇配体组成，这些配体衍生自2-羟基甲基丙烷-1,3-二醇，即RC（CH2OAc）3，R = CH2 = CH-（CH2）已经研究了9-O-CH 2-和R ＝ CH 2 ＝ CH-（CH 2）7-。脱保护后，两个配体是非常合适的受体，用于将分子功能（例如Fe4单分子磁体）通过OH基团锚定到Si表面。通过H封端的Si（100）与CH2 = CH-端基之间的氢化硅烷化反应获得单层，并以纯形式制备或以惰性1-烯烃稀释以实现对受体浓度和一致取向的精确控制在表面上。 Fe4簇的随后锚固，特别是为垂直原子序列设计的锚固，已经很有利于阐明配体摩尔分数对分子受体排序的影响。通过结合角度分辨X射线光电子能谱（AR-XPS），FTIR衰减全反射（ATR）光谱和原子力显微镜（AFM），包括力光刻实验，我们已经对相关的结构和形态有了深入的了解。有证据表明，顶端基团的空间位阻对于表面浓度至关重要，而对于束缚单元的几何方向也至关重要。还已经评估了老化对单层结构的影响以及可能的恢复过程。

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