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Infinite chains constructed from flexible bis(benzimidazole)-based ligands
Authors:Hui Jiang  Ying-Ying LiuJian-Fang Ma  Wen-Li ZhangJin Yang
Affiliation:Key Lab of Polyoxometalate Science, Department of Chemistry, Northeast Normal University, Changchun 130024, People’s Republic of China
Abstract:Two neutral ligands, L1 · 2H2O and L2 · H2O, and seven complexes, [Cu(pmb)2(L1)] (1), [Cu(pmb)2(L2)] (2), [Cu(Ac)2(L2)] · 4H2O (3), [Cu(4-aba)2(L2)] (4), [Ag(4-ts)(L1)(H2O)] (5), [Ag2(epes)2(L1)] · 2H2O (6), [Ag(1,5-nds)0.5(L2)] · 0.5C2H5OH · H2O (7) [where L1 = 1,1′-(1,4-butanediyl)bis(2-methylbenzimidazole); L2 = 1,1′-(1,4-butanediyl)bis(2-ethylbenzimidazole), pmb = p-methoxybenzoate anion; Ac = acetate anion; 4-aba = 4-aminobenzoate anion; 4-ts = p-toluenesulfonate anion; epes = N-(2-hydroxyethyl)piperazine-N′-(2-ethanesulfonate) anion; 1,5-nds = 1,5-naphthalenedisulfonate anion], have been synthesized and characterized by elemental analysis, IR, and single-crystal X-ray diffraction. The L1 and L2 ligands in compounds 17 act as bridging ligands, linking metal ions into chain structures. The chains in compounds 3, 4 and 6 interlace with each other by hydrogen bonds to generate 3D supramolecular structures. In compound 5, π–π interactions between adjacent L1 ligands hold the chains to a supramolecular layer. In compound 7, the sulfonate anions act as counterions in the framework. The thermal stabilities of 3, 6 and 7, and the luminescent properties for 57 in the solid states are also discussed.
Keywords:Coordination polymers   Bis(benzimidazole)   Carboxylate   Sulfonate
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