Two novel lanthanide metal–organic frameworks (MOFs) with the formulas [Tb(bidc)(Hbidc)(H₂O)]_n (JXUST-20) and {[Tb₃(bidc)₄(HCOO)(DMF)]·solvents}_n (JXUST-21) were synthesized based on 2,1,3-benzothiadiazole-4,7-dicarboxylic acid (H₂BTDC) under solvothermal conditions. Interestingly, benzimidazole-4,7-dicarboxylic acid (H₂bidc) was formed in situ using H₂BTDC as the starting material. The self-assembly process of the targeted MOFs with different topological structures can be controlled by the solvents and concentration of the reactants. Luminescence experiments show that JXUST-20 and JXUST-21 exhibit strong yellow-green emission. JXUST-20 and JXUST-21 can selectively sense benzaldehyde (BzH) via a luminescence quenching effect with detection limits of 15.3 and 1.44 ppm, respectively. In order to expand the practical application of MOF materials, mixed-matrix membranes (MMMs) have been constructed by mixing targeted MOFs and poly(methyl methacrylate) in a N,N-dimethylformamide (DMF) solution, which can also be used for BzH vapor sensing. Therefore, the first case of MMMs derived from Tb^III MOFs has been developed for the reversible detection of BzH vapor, providing a simple and efficient platform for the future detection of volatile organic compounds.

中文翻译：

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苯甲醛蒸气可逆发光传感的 TbIII 金属有机骨架的可控合成

两种新型镧系金属有机骨架 (MOF)，分子式为 [Tb(bidc)(Hbidc)(H ₂ O)] _n ( JXUST-20 ) 和 {[Tb ₃ (bidc) ₄ (HCOO)(DMF)]·溶剂} _n ( JXUST-21 ) 是在溶剂热条件下基于 2,1,3-苯并噻二唑-4,7-二羧酸 (H ₂ BTDC) 合成的。有趣的是，苯并咪唑-4,7-二羧酸 (H ₂ bidc) 是使用 H ₂ BTDC 作为起始原料原位形成的。具有不同拓扑结构的目标 MOFs 的自组装过程可以通过溶剂和反应物的浓度来控制。发光实验表明JXUST-20和JXUST-21表现出强烈的黄绿色发射。JXUST-20和JXUST-21可以通过发光猝灭效应选择性地检测苯甲醛 (BzH)，检测限分别为 15.3 和 1.44 ppm。为了扩大 MOF 材料的实际应用，通过在N，N-二甲基甲酰胺（DMF）溶液中混合目标 MOF 和聚（甲基丙烯酸甲酯）构建了混合基质膜（MMM），该溶液也可用于BzH蒸汽感应。因此，第一例源自 Tb ^{III的 MMM}MOF 已开发用于 BzH 蒸气的可逆检测，为未来检测挥发性有机化合物提供了一个简单高效的平台。