6533b870fe1ef96bd12d0767
RESEARCH PRODUCT
A series of lanthanide(iii) metal-organic frameworks derived from a pyridyl-dicarboxylate ligand: single-molecule magnet behaviour and luminescence properties
Chengcheng ZhangEmilio PardoXiangyu LiuXiangyu LiuJesús Ferrando-soriaXiaoyong JinYi-quan ZhangJinhui YangXiufang MaPeipei Censubject
chemistry.chemical_classificationLanthanideMaterials science010405 organic chemistryLigand010402 general chemistry01 natural sciencesFluorescència0104 chemical sciencesInorganic ChemistryCrystallographyDicarboxylic acidchemistryAb initio quantum chemistry methodsElements químicsMetal-organic frameworkSingle-molecule magnetSBusLuminescencedescription
The reactions of LnIII ions with a versatile pyridyl-decorated dicarboxylic acid ligand lead to the formation of a series of novel three-dimensional (3D) Ln-MOFs, [Ln3(pta)4(Hpta)(H2O)]·xH2O (Ln = Dy (1), Eu (2), Gd (3), Tb (4), H2pta = 2-(4-pyridyl)-terephthalic acid, x = 6 for 1, 2.5 for 2, 1.5 for 3 and 2 for 4). The Ln3+ ions act as nine-coordinated muffin spheres, linking to each other to generate trinuclear {Ln3(OOC)6N2} SBUs, which are further extended to be interesting 3D topological architectures. To the best of our knowledge, the Dy-MOF exhibits zero-field single-molecule magnet (SMM) behaviour with the largest effective energy barrier among the previously reported 3D MOF-based Dy-SMMs. The combined analyses of a diluted sample (1@Y) and ab initio calculations demonstrate that the thermally assisted slow relaxation is mainly attributed to the single-ion magnetism. Furthermore, fluorescence measurements reveal that H2pta can sensitize EuIII and TbIII characteristic luminescence.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-10-07 |