Synthesis, structural, electronic and magnetic studies of [Cu(II)(saleanN₃H₃)]

[Cu(II)(saleanN₃H₃)] 1 (saleanN₃H ₃ = N,N″-bis(2-oxybenzyl)-diethylenetriamine dianion) is obtained by direct synthesis. 1 crystallizes in orthorhombic space group Pbca. The crystalline network features one-dimensional (1D) columns of zigzag chains well separated in the [1 0 0] direction. Each column is a supramolecular structure, with triangles formed among the Cu(II) ions of the chain. Local Cu(II) geometry in 1 is intermediate between square-pyramidal and trigonal-bipyramidal conformations. UV-Vis spectrum, IR, and NMR ¹H spectra prove the formation of 1. X-band ESR spectra at 77 K/300 K of a polycrystalline sample show a broad singlet with temperature independent values g_||/g_⊥ = 2.1967/2.1074. An area ratio A ₇₇/A₃₀₀ of 1.63 suggests an incomplete antiferromagnetic (AF) coupling of the copper ions. The X-band ESR spectra at 77 K in solution show typical hyperfine interactions of monomer paramagnetic copper ions. The linear chain model fits well the magnetic susceptibility data vs temperature from 2 to 300 K and is consistent with antiferromagnetic exchange interaction.