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

[Cu(II)(saleanN3H3)] 1 (saleanN3H3 = 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 A77/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.

► [Cu(II)(saleanN3H3)] shows a interesting 1D zigzag chains supramolecular structure. ► 1D zigzag chains supramolecular structure correlate well with the magnetic results. ► UV–Vis/IR spectra of [Cu(II)(saleanN3H3)] link perfectly with the Cu(II) coordination. ► ESR at 300 K/77 K spectra and J value are consistent with antiferromagnetic interaction. ► The 1D chain magnetic model fits well the magnetic data of [Cu(II)(saleanN3H3)].