EPR spectroscopy of paramagnetic centers and adsorption complexes in porous metal organic frameworks: Development and application of dielectric resonators and microresonators for investigations of small single crystals

多孔金属有机框架中顺磁中心和吸附配合物的 EPR 光谱:用于研究小型单晶的介电谐振器和微谐振器的开发和应用

基本信息

项目摘要

Porous metal-organic framework (MOF) compounds are a novel class of materials, which offer a large application potential in various areas such as adsorption, separation, catalysis, and sensing. Many of these materials contain paramagnetic ions as major framework constituents. Therefore, a detailed characterization of paramagnetic ions and their interaction with adsorbates and reactants by EPR spectroscopy is of uttermost importance for the the understanding of the adsorptive and catalytic properties and the envisaged future applications of MOF materials. Unfortunately, EPR investigations of MOF systems are restricted to powder materials so far as single crystals are only available in sub-millimeter sizes. However a proper elucidation of the structure of the formed adsorption complexes requires knowledge about the orientation of the magnetic tensors with respect to the crystallographic axes frame in many cases which can only be deduced from single crystal experiments. Here we will use dielectric resonators with high permittivities (eps = 80) that have been developed in the first funding period to study paramagnetic adsorption complexes in selected small MOF single crystals and to determine the orientation of the magnetic interaction tensors with respect to the crystallographic axes frame. The use of dielectric resonators may improve the EPR sensitivity by one order of magnitude and allows EPR measurements on sub-millimeter MOF single crystals now. In addition we will develop set-ups for pulsed EPR spectroscopy of small MOF single crystals that are based on dielectric resonators and micro resonators. They will allow us to elucidate the orientation of the ligand hyperfine coupling tensors in the adsorption complexes by ESEEM spectroscopy and will provide detailed information about their complex structure.
多孔金属有机骨架化合物是一类新型材料,在吸附、分离、催化、传感等领域具有广阔的应用前景。这些材料中的许多含有顺磁性离子作为主要骨架成分。因此,顺磁离子及其与吸附物和反应物的EPR光谱的相互作用的详细表征是最重要的吸附和催化性能的理解和设想的未来应用的MOF材料。遗憾的是,MOF系统的EPR研究仅限于粉末材料,因为单晶仅可用于亚毫米尺寸。然而,一个适当的阐明所形成的吸附复合物的结构需要知识的磁张量相对于结晶轴框架的取向,在许多情况下,这只能从单晶实验推断。在这里,我们将使用具有高折射率(eps = 80),已在第一个资助期内开发的介质谐振器,以研究在选定的小MOF单晶的顺磁吸附复合物,并确定相对于结晶轴框架的磁相互作用张量的取向。介电谐振器的使用可以将EPR灵敏度提高一个数量级,并且现在可以在亚毫米级的MOF单晶上进行EPR测量。此外,我们将开发基于介质谐振器和微谐振器的小型MOF单晶的脉冲EPR光谱的设置。他们将使我们能够阐明的配体超精细耦合张量的吸附配合物的ESEEM光谱的取向,并将提供有关其复杂的结构的详细信息。

项目成果

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Professor Dr. Andreas Pöppl其他文献

Professor Dr. Andreas Pöppl的其他文献

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{{ truncateString('Professor Dr. Andreas Pöppl', 18)}}的其他基金

Monitoring adsorption induced structural transformations of MOFs at a molecular level by in situ EPR spectroscopy
通过原位 EPR 光谱在分子水平监测吸附诱导的 MOF 结构转变
  • 批准号:
    323223618
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Units
Synthese und Strukturaufklärung von Vanadium-Phosphat-Systemen mittels Elektronen-Kern-Doppelresonanz und Elektronen-Spin-Echo-Modulationsspektroskopie
利用电子核双共振和电子自旋回波调制光谱合成磷酸钒体系并阐明其结构
  • 批准号:
    5388728
  • 财政年份:
    2002
  • 资助金额:
    --
  • 项目类别:
    Research Grants
High field EPR spectroscopy of monomer and dimer nitric oxide complexes in zeolites
沸石中单体和二聚体一氧化氮复合物的高场 EPR 光谱
  • 批准号:
    5266166
  • 财政年份:
    2000
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes

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Investigation and Application of Pulse Shaping to High-Frequency Electron Paramagnetic Resonance (EPR) / Zero-field Optically Detected Magnetic Resonance (ODMR) Spectroscopy
脉冲整形在高频电子顺磁共振 (EPR)/零场光检测磁共振 (ODMR) 光谱中的研究和应用
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    2011
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ELECTRON PARAMAGNETIC RESONANCE (EPR) SPECTROSCOPY FACILITY
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Electron Paramagnetic Resonance (EPR)/Q-Band ENDOR Spectrometer
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ELECTRON PARAMAGNETIC RESONANCE (EPR) SPECTROMETER
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High-frequency time-resolved EPR Study on the Short-lived Paramagnetic Species
短寿命顺磁性物质的高频时间分辨 EPR 研究
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EPR AND ENDOR OF PARAMAGNETIC BIOMOLECULES
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