Hierarchically organized hybrid MOF particles were developed to meet the stable luminescence requirements of lanthanide complexes for applications in biological media. Anionic terbium (Tb) complexes sensitized by tridentate pyridine-tetrazolate (pytz) ligands (i.e. Tb(pytz)₃) were encapsulated in zeolitic imidazolate framework-8 (ZIF-8) nanoparticles (∼150 nm). TIF-1Zn (Zn(DMBIM)₂) frameworks were then hybridized with ZIF-8 by the mediation of a hydrophobic ligand, i.e. DMBIM (5,6-dimethylbenzimidazole). A bio-inspired polymer, i.e. polydopamine, was utilized for imparting the particles with hydrophilicity and functionalization ability. An unprecedentedly high quantum yield (82.0%) and luminescence stability in PBS buffer were realized by the hierarchical structure.

中文翻译：

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aqueous络合物封装在分层组织的混合MOF颗粒中，可在水性介质中稳定发光†

开发了分层组织的混合MOF颗粒，以满足镧系元素配合物在生物介质中的稳定发光要求。由三齿吡啶-四唑酸酯（pytz）配体（即Tb（pytz）₃）敏化的阴离子ter（Tb）复合物被封装在沸石咪唑酸酯骨架8（ZIF-8）纳米粒子中（〜150 nm）。然后，通过疏水性配体即DMBIM（5,6-二甲基苯并咪唑）的介导，将TIF-1Zn（Zn（DMBIM）₂）骨架与ZIF-8杂交。生物启发的聚合物，即聚多巴胺被用于赋予颗粒亲水性和功能化能力。通过分层结构实现了PBS缓冲液中前所未有的高量子产率（82.0％）和发光稳定性。