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Syntheses, structures, luminescence and magnetic properties of seven isomorphous metal-organic frameworks based on 2,7-bis(4-benzoic acid)-N-(4-benzoic acid) carbazole

Abstract

We report herein seven novel lanthanide metal-organic frameworks (Ln-MOFs), [M(L27)(DMA)(H2O)·XH2O]n (TCZ-M), (M = Nd, Sm, Eu, Gd, Tb, Dy, Ho), (X = 2 or 3) (H3L27 = 2,7-bis(4-benzoic acid)-N-(4-benzoic acid) carbazole, DMA = N,N-dimethylacetamide, TCZ = “T”-shape carbazole-based MOFs, L27 = fully deprotonated H3L273- ligand). X-ray crystallography showed that all of the TCZ-M (M = Nd, Sm, Eu, Gd, Tb, Dy, Ho) are isomorphous and possesses a 3,6-connected three-dimensional (3D) framework with a point symbol of {4·62}2{42·610·83}. The photoluminescence measurement indicates that TCZ-Eu shows reddish-orange emission bands and TCZ-Sm shows both visible and near-infrared (NIR) emissions bands. Magnetic susceptibility measurements show deviations from the Curie law mainly owing to the split of the ground term due to the ligand field and spin–orbit coupling in TCZ-Eu and TCZ-Sm. The magnetic properties of TCZ-M (M = Nd, Gd, Tb, Dy, Ho) are also investigated, and the results indicate a ferromagnetic interaction between Tb3+ magnetic centers in TCZ-Tb and antiferromagnetic interactions in TCZ-M (M = Nd, Gd, Dy, Ho).

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Publication details

The article was received on 19 Oct 2017, accepted on 10 Jan 2018 and first published on 10 Jan 2018


Article type: Paper
DOI: 10.1039/C7NJ04048B
Citation: New J. Chem., 2018, Accepted Manuscript
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    Syntheses, structures, luminescence and magnetic properties of seven isomorphous metal-organic frameworks based on 2,7-bis(4-benzoic acid)-N-(4-benzoic acid) carbazole

    D. Chen, L. Lin, T. Sheng, Y. Wen, X. Zhu, L. Zhang, S. Hu, R. Fu and X. Wu, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ04048B

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