A new dissymmetrical oxamidate ligand has been used to construct a metal-organic network. Using this ligand, a novel coordination polymer, namely {[Cu(obea)]2Cu・CH3OH・H2O}n (1) [H3obea = N1-(2-carboxyphenyl)-N2-(2-hydroxyethyl)oxalamide] has been synthesized and characterized by single-crystal X-ray analysis. The structure of complex 1 consists of neutral trinuclear complex units. Through syn-anti carboxylate bridges, the complex features a 2D structure with a helical substructure. Its magnetic properties have been investigated.

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A new complex {{[Cu(oxbe)]Cu(tmen)}2・2ClO4}n (H3oxbe = N-benzoato-Nʹ-(2-aminoethyl)- oxamido, tmen = N,N,Nʹ,Nʹ-tetramethylethylenediamine) has been synthesized and characterized by IR spectroscopy, elemental analysis, and single-crystal X-ray diffraction, and by its magnetic properties. It crystallizes in the triclinic system, space group P¯1, with a = 1.364(2), b = 1.379(2), c = 1.516(3) nm, α = 64.402(3), β = 66.098(3), γ = 89.604(3)°, V = 2.301(7) nm3, Z = 2, Dcalcd. = 1.71 g cm−3. The structure of 1 consists of tetranuclear units. Through syn-anti carboxylate bridges, the complex features a chain structure.