Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan.
Organization for the Promotion of Regional Innovation, Mie University, Tsu, Mie 514-8507, Japan.
Molecules. 2018 Nov 6;23(11):2893. doi: 10.3390/molecules23112893.
The three-point adsorption of tripod-shaped molecules enables the formation of robust self-assembled monolayers (SAMs) on solid surfaces, where the component molecules are fixed in a strictly upright orientation. In the present study, SAMs of a rigid molecular tripod consisting of an adamantane core and three CH₂SH groups were employed to arrange ferrocene on a gold surface through oligo(-phenyleneethynylene) linkers. Cyclic voltammetry of the monolayers demonstrated high surface coverage of ferrocene, yet the molecular interaction among adjacent ferrocene units was negligible. This was because of the extended intermolecular distance caused by the bulky tripod framework. The rates of electron transfer from the ferrocene to the gold surface through different linker lengths were determined by electrochemical measurements, from which the decay factor for oligo(-phenyleneethynylene) wire was evaluated.
三脚架分子的三点吸附作用能够在固体表面上形成稳定的自组装单层（SAM），其中组成分子被固定在严格的垂直方向上。在本研究中，使用由金刚烷核心和三个 CH₂SH 基团组成的刚性分子三脚架的 SAM 通过寡聚（苯乙炔）接头将二茂铁排列在金表面上。单层的循环伏安法表明二茂铁具有高的表面覆盖率，但是相邻二茂铁单元之间的分子相互作用可以忽略不计。这是因为庞大的三脚架框架导致了分子间距离的延长。通过电化学测量确定了通过不同接头长度从二茂铁到金表面的电子转移速率，从中评估了寡聚（苯乙炔）线的衰减因子。
