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Issue 35, 2010
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Multi-dimensional transition-metal coordination polymers with 5-nitro-1,2,3-benzenetricarboxylic acid exhibiting ferro-/antiferromagnetic interactions

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Abstract

Six transition metal coordination polymers, [Cu3(nbta)2(bipy)2(H2O)2]·2H2O (1), [Cu3(nbta)2(bpp)2(H2O)2]·2H2O (2), [Co3(nbta)2(bipy)3(H2O)2]·2H2O (3), [Co3(nbta)2(bpp)2(H2O)2] (4), [Ni2(Hnbta)2(bipy)2(H2O)2] (5) and [Ni3(nbta)2(bpa)3(H2O)2]·2H2O (6) (H3nbta = 5-nitro-1,2,3-benzenetricarboxylic acid, bipy = 4,4′-bipyridine, bpa = 1,2-bis(4-pyridyl)ethane, bpp = 1,3-bis(4-pyridyl)propane), have been hydrothermally synthesized by the reactions of CuII, CoII and NiII salts with H3nbta in the presence of dipyridyl-type co-ligands, respectively. Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, and TG analyses. Compounds 1–4 and 6 exhibit 3D pillared-layer structures while compound 5 has a 2D layer. The nbta3− ligands in the 2D carboxylate layer motifs of 1–4 and 6 connect transition metal ions in different coordination modes, and the dipyridyl-type co-ligands in compounds 1–4 and 6 serve as the pillar between the 2D layers, creating 3D open frameworks. From a topologic point of view, complex 1, 2 and 4 present 4-connected 3D coordination frameworks with the topologies of (42·62·82) (62·72·82) (42·62·7·8), (64·82) (42·64) (42·64) and (4·64·8)(44·62)(43·63) respectively. Complex 3 shows a (4,5)-connected 3D network with (42·67·8)(64·82)(42·64) topology. Whereas the structure of 5 is a 2D (4,4) net due to the partially deprotonated H3nbta ligand existed. Complex 6 features a 3D (4,5)-connected framework with (4·68·8) (65·8) (4·65) topology, also exhibiting the intriguing helical motif. The variable-temperature magnetic susceptibility studies reveal antiferromagnetic interactions between CuII or CoII ions in 1, 2, 3, 4 and ferromagnetic interactions between NiII ions for 5 and 6, respectively.

Graphical abstract: Multi-dimensional transition-metal coordination polymers with 5-nitro-1,2,3-benzenetricarboxylic acid exhibiting ferro-/antiferromagnetic interactions

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Publication details

The article was received on 05 Feb 2010, accepted on 16 Jun 2010 and first published on 05 Aug 2010


Article type: Paper
DOI: 10.1039/C002581J
Dalton Trans., 2010,39, 8210-8218

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    Multi-dimensional transition-metal coordination polymers with 5-nitro-1,2,3-benzenetricarboxylic acid exhibiting ferro-/antiferromagnetic interactions

    L. Ma, Q. Meng, L. Wang, B. Liu and F. Liang, Dalton Trans., 2010, 39, 8210
    DOI: 10.1039/C002581J

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