当前位置: X-MOL 学术Dalton Trans. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Isostructural lanthanide-based metal–organic frameworks: structure, photoluminescence and magnetic properties†
Dalton Transactions ( IF 3.5 ) Pub Date : 2017-12-07 00:00:00 , DOI: 10.1039/c7dt04024e
Li-Lin Luo 1, 2, 3, 4 , Xiang-Long Qu 1, 2, 3, 4 , Zheng Li 1, 2, 3, 4 , Xia Li 1, 2, 3, 4 , Hao-Ling Sun 5, 6, 7, 8
Affiliation  

A series of the anhydrous lanthanide-based metal–organic frameworks (Ln-MOFs) were successfully synthesized under hydrothermal conditions of Ln(III) ions with 3,4′-oxybis(benzoate) (3,4′-oba), oxalate (ox) and 1,10-phenanthroline (phen). Structural analyses revealed that they are isostructural 3D open-frameworks with the formula of [Ln(3,4′-oba) (phen)(ox)0.5]n (Ln = Sm for 1, Eu for 2, Gd for 3, Tb for 4, and Dy for 5) and the topology of {33·43·58·6}. Within the 3D structure, the [LnO6N2] units are bridged by ox to form [Ln2ox] dimers and then are further connected by 3,4′-oba ligands. These complexes feature high chemical stabilities in common solvents, boiling water, and acidic (pH = 3) and alkaline (pH = 13) solutions and high thermal stability even up to 400 °C. The photoluminescence and magnetic properties were studied. Especially, 2 shows bright red emission with a high luminescence efficiency of 40.51%. We mainly discuss the luminescence properties of 2 in common solvents and inorganic ions. It shows luminescence stability in common solvents and the ability to detect ammonia and Fe3+ ions under a long excitation wavelength (350 nm). Significantly, magnetic studies reveal that the Dy-MOF, 5, shows a typical single-molecule magnetic behavior. Under zero dc field, compound 5 shows temperature and frequency dependent out-of-phase (χ′′M) signals, indicating the existence of slow magnetic relaxation.

中文翻译:

镧系元素同构的金属-有机骨架:结构,光致发光和磁性

在水热条件下,Ln(III)离子与3,4'-氧双(苯甲酸酯)(3,4'-oba),草酸酯( ox)和1,10-菲咯啉(phen)。结构分析表明,它们是同构的3D开放框架,其公式为[Ln(3,4'-oba)(phen)(ox)0.5 ] n(Ln = Sm表示1,Eu表示2,Gd表示3,Tb为4,和Dy为5)和拓扑{3 3 ·4 3 ·5 8 ·6}。在3D结构中,[LnO 6 N 2]单元被ox桥接以形成[Ln 2 ox]二聚体,然后进一步通过3,4'-oba配体连接。这些配合物在普通溶剂,沸水,酸性(pH = 3)和碱性(pH = 13)溶液中均具有很高的化学稳定性,甚至在高达400°C的温度下也具有很高的热稳定性。研究了光致发光和磁性。特别地,2显示出具有40.51%的高发光效率的鲜红色发射。我们主要讨论2在普通溶剂和无机离子中的发光特性。它显示了在普通溶剂中的发光稳定性以及在长激发波长(350 nm)下检测氨和Fe 3+离子的能力。值得注意的是,磁研究表明Dy-MOF,5,显示了典型的单分子磁行为。在零DC场,化合物5示出了温度和依赖于频率的失相(χ '中号)的信号,指示慢磁弛豫的存在。
更新日期:2017-12-07
down
wechat
bug