MOF Based Sorption Sensors by Rare Earth Luminescence

该项目专注于两种特性的结合：发光和吸收，它们的依赖性使得可以通过观察发射来实现一种新的吸收传感器。在最初的阶段，成功地证明了发光可以作为一种本征性质被实现到Ln-N-MOF中，从而获得目前已知的最高量子效率的MOF。实验还证明，在相同的MOF材料中，微孔率与发光结合在一起，并且发光可以被某些吸附剂猝灭。为了提高选择性，第二阶段的目标是将连接基既作为天线又作为孔系统的修饰剂的新型MOF。基于官能化富勒烯的新型反相金属有机化合物，其中有机连接物通过金属离子相互连接形成连接中心。这提供了两个前景：本征发光和改进的吸附猝灭选项，以及将发光纳米颗粒包含到反向MOF中。与不包含这些颗粒的传统MOF和ZIF相比，官能化的富勒烯提供了它们自己延伸的纳米间距。光致发光将通过光致发光光谱、量子产额、衰变测定以及利用BET和漂移天平在200bar以下的气孔率来表征。该项目的最终目标是通过同时进行荧光/孔隙率研究来量化依赖发光与吸附的关系，以评估传感器的效果。

The project focuses on a combination of two properties: luminescence and sorption, with their depen-dency rendering a new sensoring for sorption accessible via observation of an emission. In the prelim-inary period it was successfully shown that luminescence can be implemented into Ln-N-MOFs as an intrinsic property leading to the MOFs with the highest quantum efficiencies known today. It was also proven that microporosity is observed in combination with luminescence in the same MOF material and that luminescence can be quenched by certain adsorbants. To improve the selectivity, new MOFs with linkers suitable both as antennas as well as modifiers of the pore systems are aims of the second period. Novel inverse MOFs based on functionalized fullerenes are included in which the organic linker constitutes the connectivity centers interlinked by metal ions. This offers two perspectives: Intrinsic luminescence with improved quenching options upon sorption as well as the inclusion of luminescent nanoparticles into the inverse MOF. Functionalized fullerenes offer nanometer spacing from their own extensions in contrast to conventional MOFs and ZIFs that do not incorporate these particles. Lumi-nescence will be characterized by photoluminescence spectroscopy, quantum yield, decay determina-tions, and porosity utilizing BET and drifting balances for pressures up to 200 bar. Quantification of the dependency luminescence versus sorption to evaluate the sensor effect by simultaneous fluorescence / porosity studies is the final goal of the project.