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Two lanthanide metal–organic frameworks constructed from tris(4-carboxyphenyl)phosphane oxide with gas adsorption and magnetic properties

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Abstract

Two lanthanide metal–organic frameworks (LOFs), namely, {[Eu(L3−)(H2O)]·5H2O}n (1) and {[Dy(L3−) (H2O)]·2CH3CN}n (2), have been synthesized based on tris(4-carboxyphenyl)phosphane oxide (H3L) and further characterized by powder X-ray diffraction (PXRD), IR spectroscopy, elemental analyses and thermogravimetric (TG) analyses. X-ray diffraction analyses showed that complexes 1 and 2 are isostructural, and thus the structure and gas adsorption properties of complex 1 and the magnetic properties of 2 were described as a representative in detail. Complex 1 appears to have a 3D 6-connected {412·63} net based on binuclear {Eu2(COO)2} SBUs. Furthermore, the adsorption properties of 1 have been investigated using N2, H2, CO2 and CH4 gases. 1 has high CO2 uptake and exhibits highly selective adsorption of CO2 over CH4 at room temperature, which allows 1 to have a potential application in gas separation and purification. Finally, its full magnetic properties revealed that complex 2 displays antiferromagnetic coupling between DyIII ions and single-molecule magnet (SMM) behavior. According to the Arrhenius law, the anisotropy barrier (Ueff) and pre-exponential factor (τ0) were extracted by fitting of the alternating current data, giving the values of 53.5 K and 3.1 × 10−7 s, respectively. The afforded α parameter is less than 0.10, suggesting a single relaxation process.

Graphical abstract: Two lanthanide metal–organic frameworks constructed from tris(4-carboxyphenyl)phosphane oxide with gas adsorption and magnetic properties

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Publication details

The article was received on 25 Apr 2018, accepted on 20 Jun 2018 and first published on 21 Jun 2018


Article type: Paper
DOI: 10.1039/C8CE00661J
Citation: CrystEngComm, 2018, Advance Article
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    Two lanthanide metal–organic frameworks constructed from tris(4-carboxyphenyl)phosphane oxide with gas adsorption and magnetic properties

    T. Hu, Q. Zhao, L. Huo, L. Gao, J. Zhang, X. Wang and L. Fan, CrystEngComm, 2018, Advance Article , DOI: 10.1039/C8CE00661J

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