The limited processability of metal-organic frameworks (MOFs) is hindered flexibility in the manipulation of their aggregation state and applications. Therefore, achieving highly processable MOFs is of great significance but a challenging goal. Herein, a facile strategy is presented for achieving the construction of solution-processable Mg-based MOF, NKU-Mg-1, allowing for dynamic control of the aggregation state through dynamic self-assembly (DySA) process and reversible circularly polarized luminescence (CPL) switcher modulation. Notably, micron-sized crystals of NKU-Mg-1 can be readily dispersed in water to form nano-sized colloids, triggered by the dynamic COO-Mg coordination bonding interruption by the competitive H₂O-Mg bonding. Accordingly, the aggregation state of the colloid MOF can be readily tuned from 50–80 nm up to 1000 nm, in turn enabling control of aggregation-dependent emission. Specially, the solid-phase aggregation can be controlled via structural transitions between 3D NKU-Mg-1-rec-1 and 2D NKU-Mg-1-rec-2 nano-crystals, as confirmed by 3D electron diffraction. Furthermore, benefiting from its highly dynamic tunable aggregation nature, the rational incorporation of the chiral module confers significant CPL activity (g_lum up to 0.01). Importantly, controllable dynamic aggregation enables reversible switching of the CPL activity by precisely regulating the aggregation states. The solution-processable and dynamic aggregation-tunable features endow it highly promising for applications.

中文翻译：

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溶液可加工的金属有机框架，具有高度可调的动态聚集态


金属有机框架 （MOF） 的有限可加工性阻碍了其聚集状态和应用的灵活性。因此，实现高度可加工的 MOF 具有重要意义，但也是一个具有挑战性的目标。在此，提出了一种简单的策略来实现可溶液加工的 Mg 基 MOF NKU-Mg-1 的构建，允许通过动态自组装 （DySA） 过程和可逆圆偏振发光 （CPL） 开关调制对聚集状态进行动态控制。值得注意的是，NKU-Mg-1 的微米级晶体可以很容易地分散在水中形成纳米级胶体，这是由竞争性 H₂O-Mg 键合的动态 COO-Mg 配位键中断触发的。因此，胶体 MOF 的聚集状态可以很容易地从 50-80 nm 调整到 1000 nm，从而能够控制聚集依赖性发射。特别是，正如 3D 电子衍射所证实的那样，可以通过 3D NKU-Mg-1-rec-1 和 2D NKU-Mg-1-rec-2 纳米晶体之间的结构转变来控制固相聚集。此外，得益于其高度动态的可调聚集性质，手性模块的合理掺入赋予了显著的 CPL 活性 （g_lum 高达 0.01）。重要的是，可控的动态聚集通过精确调节聚集状态实现了 CPL 活性的可逆切换。解决方案可加工和动态聚合可调功能使其在应用中极具前景。