Departament de Química Física, Universitat de Barcelona , Diagonal 645, and Institut de Bioenginyeria de Catalunya (IBEC) , Baldiri Reixac 15-21, 08028 Barcelona, Catalonia, Spain.
Nano Lett. 2014 Aug 13;14(8):4751-6. doi: 10.1021/nl501884g. Epub 2014 Jul 3.
Porphyrin-based molecular wires are promising candidates for nanoelectronic and photovoltaic devices due to the porphyrin chemical stability and unique optoelectronic properties. An important aim toward exploiting single porphyrin molecules in nanoscale devices is to possess the ability to control the electrical pathways across them. Herein, we demonstrate a method to build single-molecule wires with metalloporphyrins via their central metal ion by chemically modifying both an STM tip and surface electrodes with pyridin-4-yl-methanethiol, a molecule that has strong affinity for coordination with the metal ion of the porphyrin. The new flat configuration resulted in single-molecule junctions of exceedingly high lifetime and of conductance 3 orders of magnitude larger than that obtained previously for similar porphyrin molecules but wired from either end of the porphyrin ring. This work presents a new concept of building highly efficient single-molecule electrical contacts by exploiting metal coordination chemistry.
基于卟啉的分子线由于其卟啉化学稳定性和独特的光电特性，是纳米电子学和光伏器件的有前途的候选者。在纳米尺度器件中利用单个卟啉分子的一个重要目标是拥有控制它们之间的电通路的能力。本文中，我们通过化学修饰 STM 针尖和表面电极上的吡啶-4-基-甲硫醇，展示了一种通过金属中心离子构建具有金属卟啉的单分子线的方法，该分子对与卟啉金属离子的配位具有很强的亲和力。新的平面构型导致单分子结具有极高的寿命，并且其电导比以前通过卟啉环的任一端布线得到的类似卟啉分子的电导大 3 个数量级。这项工作提出了一种通过利用金属配位化学构建高效单分子电接触的新概念。
