Structural diversity of Cu(II) compounds of Schiff bases derived from 2-hydroxy-1-naphthaldehyde and a series of aminobenzoic acid
2011
Niu, Meiju | Cao, Zhiqiang | Xue, Ruiting | Wang, Suna | Dou, Jianmin | Wang, Daqi
Five novel Cu(II) metal–organic coordination polymers, [(CuL¹)ₙ] (1), [Cu₂L₂ ²(Py)₄] (2), [Cu(HL³)(DMF)₂] (3), [Cu₆L₄ ³(Py)₆·H₂O]ₙ (4), [Cu₆L₄ ³(Py)₈(C₁₀H₈N₂)₂·8CH₃OH]ₙ (5) (H₂L¹=N-2-hydroxy-naphthaldehyde-1-alkenyl-o-amino acid, H₂L²=N-2-hydroxy-naphthaldehyde-1-alkenyl-m-amino acid, H₂L³=N-2-hydroxy-naphthaldehyde-1-alkenyl-o-amino-terephthalic acid), have been synthesized and characterized by IR, elemental analysis, UV spectroscopy and single-crystal X-ray diffraction analyses. Complex 1 possesses helical chain structure, which are further assembled to form three-dimensional frameworks by π⋯π stacking interactions. Complex 2 and 3 exhibit dimeric and monomeric structure. Complex 4 is a novel two-dimensional layer structure based on two kinds of binuclear Secondary Building Units (SBUs), Cu₂O₂ and Cu₂(CO₂)₄. Complex 5 exhibits a distorted zigzag chain by the alternate connectivity of L and bpy molecules. This result shows that the position of carboxylate groups play an important role in the formation of supramolecular networks.
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