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Isostructural Lanthanide-Based Metal-Organic Frameworks: Structure, Photoluminescence and Magnetic Property

Abstract

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)2(ox)0.5]n (Ln = Sm for 1, Eu for 2, Gd for 3, Tb for 4, 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 acidity (pH = 3) and alkalinity (pH = 13) solutions and high thermal stability even up to 400 °C. The photoluminescence and magnetic properties were studied. Especially, 2 displays a bright red emission with the high luminescence efficiency of 40.51%. We mainly discussed the luminescence properties of 2 in common solvents and inorganic ions. It shows luminescence stability in common solvents and the ability to detect ammonia, expressly, Fe3+ ion under a long excitation wavelength (350 nm), which can be improved by adding NaNO3 into the system. Significantly, magnetic studies reveal that the Dy-MOF, 5, shows a typical single-molecule magnetic behavior. Under zero dc field, compound 5 displays temperature and frequency dependent out-of-phase (χM”) signals, indicating the existence of slow magnetic relaxation.

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Publication details

The article was received on 26 Oct 2017, accepted on 06 Dec 2017 and first published on 07 Dec 2017


Article type: Paper
DOI: 10.1039/C7DT04024E
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Isostructural Lanthanide-Based Metal-Organic Frameworks: Structure, Photoluminescence and Magnetic Property

    L. Luo, X. Qu, Z. li, X. Li and H. Sun, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT04024E

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