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2D carboxylate-bridged LnIII coordination polymers: displaying the slow magnetic relaxation and luminescent properties in detection of Fe3+, Cr2O72- and nitrobenzene

Abstract

Eight new 2D isostructural lanthanide coordination polymers (Ln-CPs), [Ln(HL)(H2O)2(NO3)]·NO3 (1-Ln, Ln = NdIII, SmIII, EuIII, GdIII, TbIII, DyIII, HoIII, and YbIII ions, H2L = 4-(3,5-dicarboxylphenyl)-2-methylpyridine, were synthesized by solvothermal methods and studied by structural analyses, magnetic analyses and luminescent probe. Crystallographic studies revealed that these compounds are 2D frameworks in which the dinuclear units with double μ-syn, syn-carboxylate bridges are interlinked by single μ-trans, trans-carboxylate bridges from the organic spacers. The layers are further stabilized and associated into 3D architectures through intra- and interlayer π···π stacking interactions and hydrogen bonding, respectively. Magnetic investigations indicated that the carboxylate bridges transmit intralayer antiferromagnetic coupling in 1-Nd, 1-Gd and 1-Ho but transmit intralayer ferromagnetic coupling in 1-Dy. Furthermore, 1-Dy also displays slow magnetic relaxation behavior with a high relaxation energy barrier (ΔUeff) of 100.7 K and a pre-exponential factor (τ0) of 1.4 × 10-8 s under zero dc field. The luminescent investigations showed that CPs 1-Eu and 1-Tb can serve as the highly selective and recyclable sensing materials for Fe3+, Cr2O72- and nitrobenzene. Thus, both 1-Eu and 1-Tb should be the excellent candidate for multifunctional sensors.

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Publication details

The article was received on 20 Aug 2017, accepted on 13 Sep 2017 and first published on 13 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT03088F
Citation: Dalton Trans., 2017, Accepted Manuscript
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    2D carboxylate-bridged LnIII coordination polymers: displaying the slow magnetic relaxation and luminescent properties in detection of Fe3+, Cr2O72- and nitrobenzene

    W. gao, F. liu, B. Y. zhang, X. Zhang, J. P. liu, E. Gao and Q. Gao, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT03088F

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