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Rational construction of a porous lanthanide coordination polymer featuring reversible guest-dependent magnetic relaxation behavior

Abstract

A new three-dimensional porous lanthanide coordination polymer {[Dy(L)(μ2-bpdo)0.5(μ4-bpdo)0.5(CH3OH)]•ClO4•3CH3OH}n (2) featuring slow magnetic relaxation has been successfully assembled by reacting a superparamagnetic chain complex{[Dy(HL)(H2O)2(CH3OH)2]•2Cl•CH3OH}n (1) with an organic bridging ligand, namely, 4,4’-bipyridine-N,N’-dioxide (bpdo) (H2L = N′-(2-hydroxybenzylidene)-picolinohydrazide). Compared with 1, complex 2 has a higher magnetic anisotropy barrier, which arises from the variation of ligand field around dysprosium ions and/or the existence of magnetic coupling between them induced by the bpdo ligand, leading to a thermal magnetic relaxation process through the second-excited doublet. Interestingly, complex 2 can undergo a reversible single-crystal-to-single-crystal conversion accompanying the desorption and adsorption of methanol molecules. The de-solvated phase, {[Dy(L)(μ2-bpdo)0.5(μ4-bpdo)0.5(CH3OH)]•ClO4}n (3), exhibits a slow magnetic relaxation process through the first-excited doublet, presenting the first example of reversible adjustment on magnetic relaxation pathway regulated by guest molecules. This exciting finding offers a new perspective for enhancing magnetic relaxation barrier.

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Publication details

The article was received on 06 Aug 2018, accepted on 11 Sep 2018 and first published on 12 Sep 2018


Article type: Research Article
DOI: 10.1039/C8QI00814K
Citation: Inorg. Chem. Front., 2018, Accepted Manuscript
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    Rational construction of a porous lanthanide coordination polymer featuring reversible guest-dependent magnetic relaxation behavior

    H. Sun, F. Ma, J. Xiong, Y. Meng, J. Yang and S. Gao, Inorg. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QI00814K

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