Anionic Lanthanide Metal-Organic Frameworks: Selective Separation of Cationic Dyes, Solvatochromic Behavior, and Luminescent Sensing of Co(II) Ion

作者：Cui, Zheng; Zhang, Xiaoying^*; Liu, Shuang; Zhou, Lei; Li, Wenliang^*; Zhang, Jingping^*

来源：Inorganic Chemistry, 2018, 57(18): 11463-11473.

DOI：10.1021/acs.inorgchem.8b01319

• CARBON-DIOXIDE CAPTURE
• COORDINATION POLYMERS
• METHYLENE-BLUE
• DRUG-DELIVERY
• GAS SORPTION
• WHITE-LIGHT
• PROTON CONDUCTIVITY
• ADSORPTION-KINETICS
• AQUEOUS-SOLUTIONS
• LIGAND SYNTHESIS

Four new microporous isostructural anionic lanthanide metal-organic frameworks (Ln-MOFs), [(CH3)(2)NH2](1.5)[Ln(1.5)(TATAT)(H2O)(4.5)]-x(solvent) {Ln = Tb, Eu, Dy, and Gd; H(6)TATAT = 5,5',5 ''-(1,3,5-triazine2,4,6-triyl)tris(azanediyl)triisophthalate}, were successfully constructed. The Ln-MOFs are three-dimensional (3D) anionic frameworks and have two sizes of square channels (8.9 X 8.9 angstrom and 4.3 x 4.3 angstrom) with a Lewis basic nitrogen-decorated pore environment. The 3D frameworks of Ln-MOFs can be simplified as (4,6)-connected she networks. Because of the anionic framework properties, Ln-MOFs can efficiently select and separate cationic dyes in the presence of anionic or neutral dyes of similar sizes. The adsorption amounts of methylene blue for Tb-MOF, Eu-MOF, Dy-MOF, and Gd-MOF are 147, 141, 133, and 143 mg g(-1), respectively. Moreover, Tb-MOF and Eu-MOF allow easy detection and identification of ethanol, acetonitrile, and diethyl ether through solvatochromism. Diethyl ether vapor also rapidly changes the colors of Tb-MOF and Eu-MOF. The photoluminescence experiments show that the absolute quantum yields of Tb-MOF (upon excitation at 341 nm), Eu-MOF (upon excitation at 396 nm), Dy-MOF (upon excitation at 341 nm), and Gd-MOF (upon excitation at 370 nm) are 32.5%, 11.0%, 2.1%, and 7.1%, respectively. In addition, Tb-MOF can detect Co2+ ion with high selectivity and quenching efficiency of 87%.

• 出版日期2018-9-17
• 单位东北师范大学