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Multi-dimensional charge transport in supramolecular helical foldamer assemblies
Chemical Science ( IF 7.6 ) Pub Date : 2017-09-13 00:00:00 , DOI: 10.1039/c7sc03341a
Alejandro Méndez-Ardoy 1 , Nagula Markandeya 2 , Xuesong Li 2 , Yu-Tang Tsai 1 , Gilles Pecastaings 3 , Thierry Buffeteau 1 , Victor Maurizot 2 , Luca Muccioli 1 , Frédéric Castet 1 , Ivan Huc 2 , Dario M Bassani 1
Affiliation  

Aromatic foldamers are bioinspired architectures whose potential use in materials remains largely unexplored. Here we report our investigation of vertical and horizontal charge transport over long distances in helical oligo-quinolinecarboxamide foldamers organized as single monolayers on Au or SiO2. Conductive atomic force microscopy showed that vertical conductivity is efficient and that it displays a low attenuation with foldamer length (0.06 Å−1). In contrast, horizontal charge transport is found to be negligible, demonstrating the strong anisotropy of foldamer monolayers. Kinetic Monte Carlo calculations were used to probe the mechanism of charge transport in these helical molecules and revealed the presence of intramolecular through-space charge transfer integrals approaching those found in pentacene and rubrene crystals, in line with experimental results. Kinetic Monte Carlo simulations of charge hopping along the foldamer chain evidence the strong contribution of multiple 1D and 3D pathways in these architectures and their dependence on conformational order. These findings show that helical foldamer architectures may provide a route for achieving charge transport over long distance by combining multiple charge transport pathways.

中文翻译:


超分子螺旋折叠组件中的多维电荷传输



芳香折叠分子是一种受生物启发的结构,其在材料中的潜在用途在很大程度上尚未被开发。在此,我们报告了对在 Au 或 SiO 2上组织为单层的螺旋寡喹啉甲酰胺折叠体中长距离垂直和水平电荷传输的研究。传导原子力显微镜表明,垂直电导率是有效的,并且随着折叠长度(0.06 Å -1 )显示出低衰减。相比之下,水平电荷传输可以忽略不计,这表明折叠体单层具有很强的各向异性。动力学蒙特卡罗计算用于探测这些螺旋分子中的电荷传输机制,并揭示了分子内空间电荷转移积分的存在,接近并五苯和红荧烯晶体中发现的积分,与实验结果一致。沿折叠链的电荷跳跃的动力学蒙特卡罗模拟证明了这些架构中多个 1D 和 3D 路径的强大贡献及其对构象顺序的依赖。这些发现表明,螺旋折叠体架构可以通过组合多个电荷传输路径来提供实现长距离电荷传输的途径。
更新日期:2017-09-13
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