Abstract Series of Eu/Tb bifunctional metal-organic frameworks (MOFs) [EuxTb1-x(L)(H2O)3]n (1-EuxTb1-x) (H4L+·Cl− = 1, 3-bis (3, 5-dicarboxyphenyl) imidazolium chloride) were synthesized successfully by solvothermal reaction. In these complexes, the adjacent Tb3+ or Eu3+ are linked by L3− to form two-dimensional sheet, and then forming three-dimensional framework by various H-bondings. All of complexes have wonderful selectivities and sensitivities for detecting 4-nitrophenol (4-NP) and Fe3+, comparatively speaking, the mixed [Eu0.5Tb0.5(L)(H2O)3]n (1-Eu0.5Tb0.5) has better sensing performance than isolate [Eu(L)(H2O)3]n (1-Eu) or [Tb(L)(H2O)3]n (1-Tb) for 4-NP; while 1-Tb has better sensing performance for Fe3+, the highest quenching constants Ksv for 4-NP and Fe3+ reach to 7.5 × 106 M−1 and 9.6 × 105 M−1. The variable temperature XRD and regenerated experiments prove the good thermal and structural stabilities of 1-EuxTb1-x. Furthermore, the sensing mechanisms of complexes as bifunctional sensors have been explored in detail based on experiments and calculations.

中文翻译：

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基于双功能镧系金属有机骨架的硝基污染物和金属离子的可调发射和选择性发光传感

摘要 Eu/Tb 双功能金属有机骨架 (MOF) 系列 [EuxTb1-x(L)(H2O)3]n (1-EuxTb1-x) (H4L+·Cl− = 1, 3-bis (3, 5-二羧基苯基）咪唑氯化物）通过溶剂热反应成功合成。在这些配合物中，相邻的Tb3+或Eu3+通过L3-连接形成二维薄片，然后通过各种H键形成三维骨架。所有配合物对4-硝基苯酚(4-NP)和Fe3+的检测都有很好的选择性和灵敏度，比较而言，混合[Eu0.5Tb0.5(L)(H2O)3]n(1-Eu0.5Tb0.5)对于 4-NP，具有比隔离 [Eu(L)(H2O)3]n (1-Eu) 或 [Tb(L)(H2O)3]n (1-Tb) 更好的传感性能；虽然 1-Tb 对 Fe3+ 具有更好的传感性能，但 4-NP 和 Fe3+ 的最高猝灭常数 Ksv 达到 7.5 × 106 M-1 和 9.6 × 105 M-1。变温 XRD 和再生实验证明 1-EuxTb1-x 具有良好的热稳定性和结构稳定性。此外，基于实验和计算详细探索了复合物作为双功能传感器的传感机制。