2,6-Dipicolinic acid (DPA) is an anthrax biomarker, whose detection is in great need. This work presented nine MOFs of three series containing three ligands of 2,6-naphthalene-dicarboxylic acid (H₂NDC), 4,4′-biphenyldicarboxylic acid (H₂BPDC), and 1,4-benzenedicarboxylate acid (H₂BDC): six single Ln-MOFs (Ln = Eu³⁺ (1, 4 and 7) and Tb³⁺ (2, 5 and 8)) and three hetero Eu/Tb-MOFs (3, 6, and 9). This work aimed at ligand regulation of the fluorescence properties and DPA detection. The solid-state emissions of 3, 6, and 9 can be assigned to the characteristic transitions of Eu³⁺ (⁵D₀ → ⁷F_J (J = 1–4)) and/or Tb³⁺ (⁵D₄ → ⁷F_J (J = 6–3)). The hetero MOFs were applied as fluorescence sensors in DPA detection. The fluorescence and DPA detection performances of 3, 6 and 9 are related to the energy differences between the ligands/DPA and Ln³⁺, showing the effect of ligand energy regulation and the competition between the three ligands and DPA. The detection performances of 3, 6 and 9 show linear responses of I_Tb/I_Euvs. DPA concentration with the limit of detections of 0.248 μM (3), 0.874 μM (6), and 2.277 μM (9). Seven interferents did not affect the DPA detection using 3, 6 and 9. Time-dependent fluorescence measurement suggested that 3, 6 and 9 responded very fast to DPA. High recoveries in the DPA detection of 3, 6 and 9 in human serum (93.96 to 108.84%) indicated their high reliabilities. The paper-based MOF sensors of 3, 6 and 9 could display emission color changes depending on C_DPA, which offers a fast field detection method for DPA.

中文翻译：

---

通过杂配MOF传感器通过配体调节对炭疽生物标记物2,6-二吡啶甲酸进行比例荧光检测

2,6-二吡啶甲酸（DPA）是一种炭疽生物标志物，需要对其进行检测。这项工作提出了三个系列的9个MOF，它们分别包含3,2,6-萘二甲酸（H ₂ NDC），4,4'-联苯二甲酸（H ₂ BPDC）和1,4-苯二甲酸（H ₂ BDC ）的三个配体）：6个单LN-的MOF（LN =铕³⁺（1，4和7）和Tb ³⁺（2，5和8））和三个杂EU /铽的MOF（3，6，和9）。这项工作旨在调节荧光性质和DPA检测的配体。的固态排放3，6，和9可以被分配到Eu的跃迁特性³⁺（⁵ d ₀ → ⁷ ˚F _Ĵ（Ĵ = 1-4））和/或Tb ³⁺（⁵ d ₄ → ⁷ F _J（J = 6-3）。异质MOF被用作DPA检测中的荧光传感器。的荧光和DPA检测性能3，6和9它们与配体/ DPA和Ln ³⁺之间的能量差有关，显示了配体能量调节的效果以及三个配体与DPA之间的竞争。的检测性能3，6和9示出了线性的响应我_铽/我_的Eu与用0.248μM（的检测的极限浓度DPA 3），0.874μM（6），和2.277μM（9）。七个干扰并不影响使用DPA检测3，6和9。时间依赖性荧光测量表明3，6和9对DPA的反应非常快。在DPA检测的高回收率3，6和9人血清（93.96至108.84％）中指示它们的高可靠性。的纸基MOF传感器3，6和9可以显示发光颜色的变化取决于Ç _DPA，它提供了对DPA快速场检测方法。