A DFT-Elucidated Comparison of the Solution-Phase and SAM Electrochemical Properties of Short-Chain Mercaptoalkylferrocenes: Synthetic and Spectroscopic Aspects, and the Structure of Fc–CH<sub>2</sub>CH<sub>2</sub>–S–S–CH<sub>2</sub>CH<sub>2</sub>–Fc
作者:Jan P. Lewtak、Marilé Landman、Israel Fernández、Jannie C. Swarts
DOI:10.1021/acs.inorgchem.5b02936
日期:2016.3.7
mainly located on the sulfur. Rapid exothermic dimerization leads to the observed dimers, Fc(CH2)n–S–S–(CH 2)nFc. Reduction of the ferrocenium groups on the dimer occurs at potentials that still showed the ferrocenyl group ΔE = Epa,monomer – Epc,dimer ≤ 78 mV, indicating that the redox properties of the ferrocenyl group on the mercaptans are very similar to those of the dimer. 1H NMR measurements showed
合成一系列难于获得的巯基烷基二茂铁即Fc(CH 2)n SH的简便合成方法,其中n = 1(1),2(2),3(3)或4(4)和Fc =铁(η 5 -C 5 H ^ 5)(η 5 -C 5 H ^ 4),被报告。在空气中观察到1 – 4二聚为相应的二硫化物19 – 22。在三斜空间群中结晶的二聚体20(Z = 2)P 1。二聚体20 - 22可以减少回原始的Fc(CH 2)Ñ SH衍生物与的LiAlH 4在回流的四氢呋喃中进行。密度泛函理论(DFT)计算表明,最高占据分子轨道1 - 4个位于完全放在二茂铁基暗示电化学氧化在约观察 -15 < E pa <76 mV(相对于FcH / FcH +)仅涉及Fe(II)到Fe(III)的过程。进一步的DFT计算表明,这种单电子氧化后,硫醇基上的质子损失,从而生成自由基Fc(CH 2)nS •,自旋密度主要位于硫上。快速放热二聚化导致观察到二聚体,即Fc(CH