Key Laboratory of Functional Inorganic Material Chemistry (MOE) and School of Chemistry and Materials Science , Heilongjiang University , Harbin 150080 , P. R. China.
Anal Chem. 2018 Jun 5;90(11):6675-6682. doi: 10.1021/acs.analchem.8b00494. Epub 2018 May 22.
A series of isomorphic lanthanide metal-organic frameworks (Ln-MOFs), namely [Ln(dcbba)(DMF)] ·HO·0.5DMF [Ln = La (1), Eu (2) and Tb (3); Hdcbba = 4-(3, 5-dicarboxylatobenzyloxy)benzoic acid; DMF = N, N'-dimethylformamide] have been designed and synthesized by the solvothermal reactions of Hdcbba and La(NO)·6HO. Single-crystal X-ray diffraction analysis reveals that the complexes 1-3 exhibit a (3,6)-connected open framework structure with binuclear [Ln(COO)] secondary building units as 6-connected nodes and Hdcbba ligands as 3-connected nodes. The isostructural mixed La/Eu/Tb-dcbba (4) was obtained via the in-suit doping of different Ln ions into the host framework, which is able to emit pure orange, white, and blue light when excited at 300, 305, and 350 nm, respectively. Subsequently, a novel and multifunctional sensing process was designed based on the excitation wavelength sensitive color tunable luminescent sample 4, which can detect HS ions, THF (tetrahydrofuran), and Ag ions via different luminescence color change mechanisms. The remarkable color change, excellent selectivity, and high sensitivity further indicate the promise of this type of multifunctional luminescent materials for the sensing of anion, cation, and organic small molecule.
一系列同构的镧系金属有机骨架（Ln-MOFs），即[Ln(dcbba)(DMF)]·HO·0.5DMF [Ln = La (1)，Eu (2) 和 Tb (3)；Hdcbba = 4-(3,5-二羧基苯甲基)苯甲酸；DMF = N, N'-二甲基甲酰胺]，通过 Hdcbba 和 La(NO)·6HO 的溶剂热反应设计和合成。单晶 X 射线衍射分析表明，配合物 1-3 具有（3,6）连接的开放骨架结构，双核[Ln(COO)] 作为 6 连接节点，Hdcbba 配体作为 3 连接节点。通过将不同的 Ln 离子原位掺杂到主体骨架中，获得了同构的混合 La/Eu/Tb-dcbba（4），当分别在 300、305 和 350nm 激发时，它能够分别发射出纯橙色、白色和蓝色光。随后，基于具有激发波长敏感的颜色可调谐发光样品 4，设计了一种新型多功能传感过程，可以通过不同的发光颜色变化机制检测 HS 离子、THF（四氢呋喃）和 Ag 离子。显著的颜色变化、优异的选择性和高灵敏度进一步表明，这种多功能发光材料在阴离子、阳离子和有机小分子的传感方面具有广阔的应用前景。
