Oligomeric Metallocenes for Molecular Electronics

用于分子电子学的低聚茂金属

• 批准号: 401425981
• 负责人: Dr. Marie Bergner
• 金额: --
• 依托单位: Department of Chemistry
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/401425981?language=en
• 关键词: Oligomeric; Metallocenes; Molecular; Electronics

Oligomers consisting of multiple covalently linked metallocene units are a promising class of materials for potential application in molecular electronic devices. This project will focus in the synthesis of tailor-made metallocene oligomers featuring two or three metallocene units in a linear fashion, or six metallocene units in cyclic oligomers. Special emphasis will be on a thorough and generalized understanding of the ways in which the individual redox active metal centres within the oligomeric structure communicate and how this communication affects the overall electronic and electrochemical properties, including accessibility of distinct redox states and the degree of spin delocalization. Therefore, different variants of the bimetallocene and trimetallocene as well as of the hexameric ring will be prepared by varying the central metals. Isolation of chemically oxidized species will afford paramagnetic, mixed valent compounds, that allow for inisght into delocalization effects. Suitable building blocks for the deposition as thin films will then be chosen based on their properties on a molecular level. This bottom-up approach will lead to directed preparation of thin films with predictable properties (e.g. no or high conductivity). The resulting films will be characterized by a number of techniques (such as AFM, SEM) from a materials scientist´s point of view, highlighting the interdisciplinary approach of this project. Potentially switchable properties such as conductivity will be addressed by applying voltages or oxidating/ redcuing conditions to the resulting materials, making the new class of materials promising candidates for applications in molecular electronic devices, such as moleular switches, sensors, and wires.

由多个共价连接的茂金属单元组成的低聚物是一类在分子电子器件中具有潜在应用前景的材料。该项目将专注于合成定制的茂金属齐聚物，其特征是以线性方式具有两个或三个茂金属单元，或以环状低聚物中的六个茂金属单元。特别强调彻底和普遍地了解低聚结构中各个氧化还原活性金属中心的通信方式，以及这种通信如何影响整体的电子和电化学性质，包括不同氧化还原态的可及性和自旋离域的程度。因此，将通过改变中心金属来制备双茂金属和三茂金属以及六聚环的不同变体。化学氧化物种的分离将提供顺磁性的混合价化合物，从而允许发生离域效应。然后，将根据分子水平上的性质来选择适合作为薄膜沉积的构建块。这种自下而上的方法将导致定向制备具有可预测性能(例如，无或高导电性)的薄膜。从材料科学家S的观点来看，最终得到的薄膜将通过多种技术(如原子力显微镜、扫描电子显微镜)进行表征，突出了该项目的跨学科方法。潜在的可切换性质，如导电性，将通过对所得材料施加电压或氧化/还原条件来解决，使这类新材料有望应用于分子电子器件，如分子开关、传感器和电线。