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Issue 43, 2012
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Chelating Schiff base assisted azide-bridged Mn(II), Ni(II) and Cu(II) magnetic coordination polymers

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Abstract

Four new Mn(II), Ni(II) and Cu(II) coordination polymers [Mn2(L1)(μ1,1-N3)21,3-N3)2]n (1), [Ni(L2)21,3-N3)]n(ClO4)n (2), [Cu(L3)(μ1,1-N3)(N3)]n (3) and [Cu(L4)(μ1,1-N3)2]n (4) (L1 = N,N′-bis(2-pyridylmethylene)ethane-1,2-diamine, L2 = N-(2-pyridylmethylene)methylamine, L3 = N-(2-pyridylmethylene)-3-pyridylamine, L4 = N-(2-pyridylmethylene)-tbutylamine) have been synthesized and characterized by single-crystal X-ray analysis and magnetic measurements. Complex 1 indicates a stoichiometry-dependent structural change (based on Mn : L1 : N3 = 2 : 1 : 4 molar ratio) and consists of two-dimensional (2-D) (4,4) net layers, in which Mn(II) centers are co-bridged by single end-to-end (EE), double end-on (EO) azide and chelate-bridging L1 ligands. Complex 2 shows a single EE azide-bridged one-dimensional (1-D) Ni(II) chain. Complexes 3 and 4 indicate single EO and double EO azide-bridged 1-D Cu(II) chains, respectively. Complex 1 exhibits weak ferromagnetism due to its intra-layer spin-canting with Tc = 20 K. Complex 2 shows an unusual intra-chain ferromagnetic coupling and spin-canting behaviour. Both complexes 3 and 4 exhibit intra-chain antiferromagnetic interactions. Magneto-structural parameters for these related complexes were also discussed.

Graphical abstract: Chelating Schiff base assisted azide-bridged Mn(ii), Ni(ii) and Cu(ii) magnetic coordination polymers

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Publication details

The article was received on 02 Jun 2012, accepted on 31 Aug 2012 and first published on 03 Sep 2012


Article type: Paper
DOI: 10.1039/C2DT31186K
Dalton Trans., 2012,41, 13379-13387

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    Chelating Schiff base assisted azide-bridged Mn(II), Ni(II) and Cu(II) magnetic coordination polymers

    S. Bai, C. Fang, Z. He, E. Gao, C. Yan and T. S. A. Hor, Dalton Trans., 2012, 41, 13379
    DOI: 10.1039/C2DT31186K

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