Interplay of structural and electronic properties and their impact on thin films of metal-free organic radicals (Prolongation).

结构和电子特性的相互作用及其对不含金属有机自由基薄膜的影响（延长）。

• 批准号: 394233453
• 负责人: Professorin Dr. Maria Benedetta Casu
• 金额: --
• 依托单位: Department of Chemistry
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/394233453?language=en
• 关键词: Interplay; structural; electronic; properties; their

I intend to intercorrelate the structure with the film properties of (poly)radical thin films, also addressing their film stability. I want to tune the film structure, also using different functional groups, i.e., designing the chemical structure of the films, tuning the growing conditions, and investigating the impact on the film proprieties. We are going to evaporate radicals, diradicals, and triradicals. After optimizing a growth recipe to obtain films and monolayers of intact radicals, the systems will be fully characterized, intercorrelating structural, and electronic properties. The investigations will be mainly performed with X-ray based techniques also by using synchrotron radiation. I will also investigate how the strength of the interaction between the (poly)radical and the substrate influences not only the formed interface but also the growth modes and the film processes of the radical thin films. Assessing the film stability is important for two main reasons: 1) to understand the chemistry of the films once exposed to air before performing electron spin resonance (ESR) spectroscopy that is the traditional (ex-situ) technique used for radicals. 2) To define the film stability in an environment simulating a working device. We have also developed a protocol to investigate the effects of air exposure on the radical thin films and we will use it.Within the present project, I intend to extend our X-ray magnetic circular dichroism (XMCD) investigations performing magnetization measurements depending on the field to identify the magnetic character of the films and if possible, to obtain a hysteresis curve for magnetization because this will give a clear indication on the magnetic character of the system.

我打算相互关联的（聚）自由基薄膜的薄膜性质的结构，也解决他们的薄膜稳定性。我想调整膜结构，也使用不同的官能团，即，设计薄膜的化学结构，调整生长条件，并研究对薄膜性能的影响。我们要蒸发自由基，二自由基和三自由基。在优化生长配方以获得完整自由基的薄膜和单层之后，系统将被充分表征，相互关联的结构和电子性质。调查将主要使用X射线技术，也使用同步辐射。我还将研究（聚）自由基和基板之间的相互作用的强度如何影响不仅形成的界面，但也自由基薄膜的生长模式和膜过程。评估薄膜稳定性很重要，主要有两个原因：1）在进行电子自旋共振（ESR）光谱之前，了解薄膜一旦暴露于空气中的化学性质，ESR光谱是用于自由基的传统（非原位）技术。2)定义在模拟工作设备的环境中的薄膜稳定性。我们还开发了一个协议，以调查空气暴露对自由基薄膜的影响，我们将使用它。在本项目中，我打算扩展我们的X射线磁性圆二色性（XMCD）调查执行磁化测量取决于磁场，以确定薄膜的磁性特征，如果可能的话，以获得磁化的磁滞曲线，因为这将给出关于系统的磁特性的清楚指示。