Four Coordination Polymers Assembled with a New Biscarboxyl-functionalized Schiff Base Ligand

Abstract

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 L^4– anion are ligated by Mn²⁺ ions, and the structure displays a layer. In CP2, the Fe²⁺ cations are linked by L^4– anions to form a binuclear double chain. CP3 displays a [Cu₂(HL)₂] dimer. In CP4, the Ni²⁺ ions are connected by L^4– 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.

Keywords

Coordination polymer / Schiff base / Carboxylic acid / Dye adsorption

References

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