Two new copper(II) complexes, [(CuL) 2 (µ 1,1-N 3) 2 ]·2H 2 O (1) and [Cu(HL)(2,2-bipy)-(CH 3 COO)]·ClO 4 ·H 2 O (2), have been synthesized using the tridentate NNO Schiffbase ligand 2-[(2-aminoethylimino)methyl]-6-methoxyphenol (HL). They have been characterized by elemental analysis, IR spectroscopy, thermal analysis, and single-crystal X-ray analysis. The copper environment is distorted square pyramidal in complex 1: two nitrogen atoms and one oxygen atom from the ligands and two nitrogen atoms from two azido ligands build the coordination polyhedron around the copper atom. The Cu-N azide-Cu angle in complex 1 is 85.6 •. This is unusually small in comparison with the same angle in other end-on doubly azido-bridged dimers. Complex 2 is mononuclear with the Cu atom having a slightly distorted octahedral geometry. Magnetic measurements of 1 have been performed in the temperature range from 2 to 300 K. The experimental data indicate an anti-ferromagnetic exchange interaction between copper(II) ions bridged by the azido ligand. The best-fit parameters for complex 1 are g = 2.18 and J = −1.31 cm −1 .

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.