| Multi-dimensional transition-metal coordination polymers with 5-nitro-1,2,3-benzenetricarboxylic acid exhibiting ferro-/antiferromagnetic interactions. | |
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MedLine Citation:
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PMID: 20689863 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Six transition metal coordination polymers, [Cu(3)(nbta)(2)(bipy)(2)(H(2)O)(2)] x 2 H(2)O (1), [Cu(3)(nbta)(2)(bpp)(2)(H(2)O)(2)] x 2 H(2)O (2), [Co(3)(nbta)(2)(bipy)(3)(H(2)O)(2)] x 2 H(2)O (3), [Co(3)(nbta)(2)(bpp)(2)(H(2)O)(2)] (4), [Ni(2)(Hnbta)(2)(bipy)(2)(H(2)O)(2)] (5) and [Ni(3)(nbta)(2)(bpa)(3)(H(2)O)(2)] x 2 H(2)O (6) (H(3)nbta = 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 Cu(II), Co(II) and Ni(II) salts with H(3)nbta 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 nbta(3-) 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 (4(2) x 6(2) x 8(2)) (6(2) x 7(2) x 8(2)) (4(2) x 6(2) x 7 x 8), (6(4) x 8(2)) (4(2) x 6(4)) (4(2) x 6(4)) and (4 x 6(4) x 8)(4(4) x 6(2))(4(3) x 6(3)) respectively. Complex 3 shows a (4,5)-connected 3D network with (4(2) x 6(7) x 8)(6(4) x 8(2))(4(2) x 6(4)) topology. Whereas the structure of 5 is a 2D (4,4) net due to the partially deprotonated H(3)nbta ligand existed. Complex 6 features a 3D (4,5)-connected framework with (4 x 6(8) x 8) (6(5) x 8) (4 x 6(5)) topology, also exhibiting the intriguing helical motif. The variable-temperature magnetic susceptibility studies reveal antiferromagnetic interactions between Cu(II) or Co(II) ions in 1, 2, 3, 4 and ferromagnetic interactions between Ni(II) ions for 5 and 6, respectively. |
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Authors:
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Lu-Fang Ma; Qing-Lei Meng; Li-Ya Wang; Bin Liu; Fu-Pei Liang |
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Publication Detail:
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Type: Journal Article Date: 2010-08-05 |
Journal Detail:
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Title: Dalton transactions (Cambridge, England : 2003) Volume: 39 ISSN: 1477-9234 ISO Abbreviation: Dalton Trans Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-25 Completed Date: 2010-12-14 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101176026 Medline TA: Dalton Trans Country: England |
Other Details:
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Languages: eng Pagination: 8210-8 Citation Subset: - |
Affiliation:
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College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471022, PR China. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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