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Issue 8, 2016
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Azide-bridged Cu(II), Mn(II) and Co(II) coordination polymers constructed with a bifunctional ligand of 6-(1H-tetrazol-5-yl)-2,2′-bipyridine

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Abstract

Three new azide-bridged coordination polymers, [M(N3)(tzbp)]n (M = Cu, 1·Cu; Mn, 2·Mn; Co, 3·Co), were successfully synthesized by the introduction of a bifunctional tetrazolate/2,2′-bipyridine ligand, 6-(1H-tetrazol-5-yl)-2,2′-bipyridine (Htzbp), from the in situ [2 + 3] cycloaddition of 6-cyano-2,2′-bipyridine in the presence of an excess of sodium azide under hydrothermal conditions. Compounds 1·Cu−3·Co were characterized by X-ray crystallography, IR spectroscopy, thermogravimetry, and elemental analysis. With tzbp ligands acting in the chelating coordination mode, compound 1·Cu was comprised of a single end-on N3 (EO-N3) bridged one-dimensional (1D) zigzag structure. Both compounds 2·Mn and 3·Co adopt two-dimensional (2D) layered structures composed of a double EO-N3 bridged dinuclear motif, [M2(EO-N3)2], which are interlinked by tzbp ligands in the chelating/bridging mode. The layers of 2·Mn and 3·Co are stacked on each other in ⋯ABAB⋯ and ⋯AAAA⋯ fashions, respectively. Magnetic investigations revealed that intrachain antiferromagnetic interactions were dominant in compound 1·Cu, and both 2·Mn and 3·Co exhibited spin-canted antiferromagnetism with critical temperatures (TN) of 3.0 and 18.4 K, respectively. Furthermore, below TN, the field-induced magnetic transitions of spin-flop and metamagnetism were observed in 2·Mn and 3·Co, respectively.

Graphical abstract: Azide-bridged Cu(ii), Mn(ii) and Co(ii) coordination polymers constructed with a bifunctional ligand of 6-(1H-tetrazol-5-yl)-2,2′-bipyridine

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Publication details

The article was received on 07 Dec 2015, accepted on 08 Jan 2016 and first published on 08 Jan 2016


Article type: Paper
DOI: 10.1039/C5DT04773K
Author version available: Download Author version (PDF)
Citation: Dalton Trans., 2016,45, 3388-3397
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    Azide-bridged Cu(II), Mn(II) and Co(II) coordination polymers constructed with a bifunctional ligand of 6-(1H-tetrazol-5-yl)-2,2′-bipyridine

    J. Tsao, J. Tsai and Chen-I. Yang, Dalton Trans., 2016, 45, 3388
    DOI: 10.1039/C5DT04773K

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