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  • Title: Three-dimensional mesomeric networks assembled from helix-linked sheets: syntheses, structures, and magnetisms.
    Author: Qin C, Wang XL, Li YG, Wang EB, Su ZM, Xu L, Clérac R.
    Journal: Dalton Trans; 2005 Aug 07; (15):2609-14. PubMed ID: 16025182.
    Abstract:
    Two new three-dimensional nickel coordination polymers, [Ni3(BTC)2(4,4'-bpy)2(H2O)5].1.5H2O (1) and [Ni(PDB)(4,4'-bpy)].0.5H2O (2)(4,4'-bpy = bipyridine, BTC = 1,2,4-benzenetricarboxylate, PDB = pyridine-3,4-dicarboxylate), have been synthesized under hydrothermal conditions and characterized by elemental analysis, IR, TGA, and single crystal X-ray diffraction. Both compounds contain 2D scaffolding motifs, and most interestingly adjacent scaffolds are connected by infinite helical chains into unique three-dimensional mesomeric networks. Moreover, temperature-dependent magnetic susceptibilities for the two compounds were studied, and ferromagnetic interactions through syn-anti carboxylate bridges between Ni sites have been observed.
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