Based on a new biscarboxyl-functionalized Schiff base ligand 1,2-cyclohexanediamino-N,N′-bis[3-methoxyl-5-(p-carboxyl-phenylazo)] salicylidene(H4L), four polymers, [(CH3)2NH2]2·[Mn3(L)2(H2O)4]·2DMF(CP1), [Fe2(L)(H2O)(DMF)](CP2), [(CH3)2NH2]·[Cu(HL)]·H2O(CP3) and [Ni2(L)(teta)]·2DMF·H2O(CP4), have been synthesized(teta=5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane). In CP1, both of the internal [N2O2] pocket and the external carboxylate groups of L4– anion are ligated by Mn2+ ions, and the structure displays a layer. In CP2, the Fe2+ cations are linked by L4– anions to form a binuclear double chain. CP3 displays a [Cu2(HL)2] dimer. In CP4, the Ni2+ ions are connected by L4– anions to form a chain. The structures are further linked by hydrogen bonds to form 2D or 3D supramolecular architectures, respectively. CP1 exhibits adsorption ability to three organic dyes.
Coordination polymer Schiff base Carboxylic acid Dye adsorption
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1.Key Laboratory of Polyoxometalate Science, Department of ChemistryNortheast Normal UniversityChangchunP. R. China
2.Inner Mongolia Key Lab of Chemistry of Natural Products and Synthesis of Functional Molecules, College of Chemistry and Chemical EngineeringInner Mongolia University for the NationalitiesTongliaoP. R. China