MOF-1和Tb@MOF-1荧光探针的设计、 合成及对痕量Cr2O72-、 S2O82-离子的识别

采用5-((4-吡啶基)甲氧基)-异烟酸(H₂PLIA)、1，3，5-三(1-咪唑基)-苯(TIB)合成了金属有机骨架Cd(PLIA)(TIB)]_n (MOF-1)，MOF-1是具有理想一维孔道的二维结构化合物，其一维孔道由柔性三角形PLIA^2-配体和刚性三角形TIB配体间隔形成。利用MOF-1 易掺杂的优势，采用后修饰合成策略制备了Tb@MOF-1。对MOF-1 和Tb@MOF-1 进行了基本表征及荧光探针性能研究。2种探针材料具有相同的结构。MOF-1和Tb@MOF-1分别对水溶液中的Cr₂O₇^2-和S₂O₈^2-离子具有较强荧光识别能力，均有响应时间快，稳定性、选择性、灵敏度高的特点。研究了MOF-1和Tb@MOF-1对Cr₂O₇^2-和S₂O₈^2-的荧光识别机理，其不同可能与Tb³⁺离子掺杂有关。

Design and synthesis of MOF-1 and Tb@MOF-1 as fluorescent probes for recognizing trace amounts of Cr2O72- and S2O82- ions

A new fluorescent probe metal-organic framework (MOF) materials formulated as Cd(PLIA)(TIB)]_n (MOF-1) was successfully obtained adopting 5-((4-pyridyl)methoxy)-isophthalic acid (H₂PLIA) and 1,3,5-tris(1-imidazolyl)-benzene (TIB). MOF-1 possesses 2D networks with an ideal 1D tunnel, and the 1D tunnel is spaced and driven by the flexible triangle PLIA^2- and rigid triangle TIB ligands. Employing the advantage of MOF-1 channel easy doping, efficient luminescent probe Tb@MOF-1 was also constructed using a coordinated post-synthetic modification strategy. MOF-1 and Tb@MOF-1 were fully characterized in detail, and the two probe materials have the same structural feature. The fluorescence recognition performance was investigated in detail, revealing a capability of MOF-1 for sensing Cr₂O₇^2-, Tb@MOF-1 for identifying S₂O₈^2- anion. Herein, the fabricated fluorescent probes exhibit fascinating features, such as fast response time, remarkable stability, excellent selectivity, and high sensitivity. The possible fluorescence recognition mechanism of Cr₂O₇^2- and S₂O₈^2- by MOF-1 and Tb@MOF-1 has been investigated, and the difference in the mechanism may be related to Tb³⁺ ion doping.