Issue 43, 2012

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

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

Supplementary files

Article information

Article type
Paper
Submitted
02 Jun 2012
Accepted
31 Aug 2012
First published
03 Sep 2012

Dalton Trans., 2012,41, 13379-13387

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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