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A series of anionic host coordination polymers based on azoxybenzene carboxylate: structures, luminescence and magnetic properties

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Abstract

A series of coordination polymers {[Ln(aobtc)(H2O)4]·Hbipy·H2O}n (H4aobtc = azoxybenzene-2,2′,3,3′-tetracarboxylic acid, bipy = 4,4′-bipyridine, and Ln = Sm(1), Eu(2), Gd(3), Tb(4), Dy(5), Er(6)) have been synthesized and characterized systematically. The cationic Hbipy+ guest incorporated polymers are isostructural sets, featuring a one-dimensional (1D) zigzag double chain edifice composed of binuclear clusters [Ln2(H4aobtc)2], with the Hbipy+ guest being located on two sides. These 1D chains are further interlinked into a 2D layer structure, and further extended into a 3D framework through hydrogen bonding interactions. The luminescence emission spectra of polymers 2 and 3 are based on the H4aobtc acid ligands, while 1 and 4 display the characteristic f–f transitions of Ln(III) ions. Magnetic measurements revealed the presence of ferromagnetic behavior in polymer 3. The magnetic behaviors of 4 and 6 are ascribed to the depopulation of the Stark levels and/or weak antiferromagnetic interactions within MOFs at lower temperature. Slow relaxation is observed through the alternating-current susceptibility measurements for 5 at lower temperature, and the coexistence of weak ferromagnetism corresponding to the spin-canting-like behavior.

Graphical abstract: A series of anionic host coordination polymers based on azoxybenzene carboxylate: structures, luminescence and magnetic properties

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Publication details

The article was received on 11 Aug 2017, accepted on 18 Sep 2017 and first published on 18 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT02974H
Citation: Dalton Trans., 2017, Advance Article
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    A series of anionic host coordination polymers based on azoxybenzene carboxylate: structures, luminescence and magnetic properties

    X. Feng, N. Guo, H. Chen, H. Wang, L. Yue, X. Chen, S. W. Ng, X. Liu, L. Ma and L. Wang, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT02974H

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