Krishna Damodaran - Coordination polymers derived from a bis-pyridyl-bis-amide ligand: Supramolecular structural diversities and anion binding properties

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      Inorg   Chim Acta,   2010, 363, 1367


      Six new coordination polymers namely [{Cu(μ-L1)(CH3COO)2}]1a,   [{Cu(μ-L1)2(CH3COO)2]1b,   [{Cu(μ-L1)2(H2O)2}(NO3)2]2,   [{Cu(μ-L1)2(H2O)2}(ClO4)2]3,   [{Cu(μ-L1)(H2O)2(μ-SO4)}·3H2O]4a  and [{Cu(μ-L1)2SO4}·X]4b  (L1 =   N,N′-bis-(3-pyridyl)terephthalamide) have been   synthesized. Single crystal structures of five coordination   polymers namely 1a,   2–4b and the free ligand   L1 are discussed in the context   of the effect of conformation dependent ligating topology of the   ligands, hydrogen bonding backbone, counter anions on the   resultant supramolecular structures observed in these   coordination polymers. It was revealed from the single crystal   X-ray structure analysis that conformation dependent ligating   topology of the bis-amide ligand L1, counter anion’s ligating strength   dependent metal: ligand ratio, hydrogen bonding ability of the   ligand as well as counter anions are responsible for the   formation of 1D zigzag, 1D looped chain, 2D corrugated sheet in   1a, 2–3, 4a4b,   respectively. By following in situ coordination polymer   crystallization technique, anion binding and separation studies   have also been performed; nitrate anion has been separated as   neat coordination polymer crystals from a complex mixture of   anions.

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