Design and construction of coordination polymers by 2,2′-dinitro-4,4′-biphenyldicarboxylate and imidazole-based ligands: diverse structures based on different metal ions

Six coordination polymers, [Mn2(nbpdc)2(bib)]n (1), [Co2(nbpdc)2(bib)1.5(H2O)2]n (2), [Ni2(nbpdc)2(bib)1.5(H2O)2]n (3), [Cu3(nbpdc)2(bib)(OH)2]n (4), [Zn2(nbpdc)2(bib)]n (5), and [Cd2(nbpdc)2(bib)(H2O)]n (6), (H2nbpdc = 2,2′-dinitro-4,4′-biphenyldicarboxylic acid, bib = 1,4-bis(imidazol-1-yl)butane), have been prepared and structurally characterized. In these compounds, nbpdc and bib link different secondary building units (SBUs) to construct various architectures based on different metals. Compounds 1 and 5 present a 3D pcu net based on an infinite rod-shaped SBU. Compounds 2 and 3 have the same 2D double-layer structure with a unique {412.52.6} topology, showing an interesting self-penetration feature. Compound 4 presents a 3D framework with hex topology. Compound 6 shows a 3D framework with unprecedented (412.513.63)(48.55.62) topology based on two different unusual infinite and finite SBUs, and has an interesting self-penetrating feature. Therefore, different metal ions influence the final structures of coordination polymers. Magnetic properties of compounds 1 and 4 have been characterized.

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