Aggregation is a conventional method to enhance the quantum yields (QYs) of pure organic luminophores due to the restriction of intramolecular motions (RIM). However, how to realize RIM in metal‐organic frameworks (MOFs) is still unclear and challenging. In this work, the ligand meta‐anchoring strategy is first proposed and proved to be an effective and systematic approach to restrict the intramolecular motions of MOFs for the QY improvement. By simply shifting the substituent position in the ligand from para to meta, the QY of the resulting MOF is significantly enhanced by eleven‐fold. The value is even higher than that of ligand aggregates, demonstrating the strong RIM effect of this ligand meta‐anchoring strategy. The introduction of co‐ligand induces the appearance of visible yellow room temperature phosphorescence with a lifetime of 222 ms due to the QY enhancement and the charge transfer between the donor and accepter units. The present work thus broadens the understanding of the RIM mechanism from a new perspective, develops a novel method to realize RIM and expands the applicable objects from pure organic materials to organic‐inorganic hybrid materials.

中文翻译：

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金属有机框架中的配体元锚定策略可显着提高量子产率

由于分子内运动（RIM）的限制，聚集是提高纯有机发光体量子产率（QY）的传统方法。然而，如何在金属有机框架（MOF）中实现 RIM 仍不清楚且具有挑战性。在这项工作中，首次提出了配体元锚定策略，并被证明是限制 MOF 分子内运动以提高 QY 的有效且系统的方法。通过简单地将配体中的取代基位置从对位转移到间位，所得 MOF 的 QY 显着增强 11 倍。该值甚至高于配体聚集体的值，证明了该配体元锚定策略的强大RIM效应。由于 QY 增强以及供体和受体单元之间的电荷转移，共配体的引入导致出现可见的黄色室温磷光，其寿命为 222 ms。因此，本工作从新的角度拓宽了对RIM机理的理解，开发了一种实现RIM的新方法，并将应用对象从纯有机材料扩展到有机-无机杂化材料。