Oxamato-Bridged Trinuclear NiIICuIINiII Complexes: A New (NiIICuIINiII)2 Hexanuclear Complex and Supramolecular Structures. Characterization and Magnetic Properties

...propylenebis(oxamato), OHpba = 2-hydroxy-1,3-propylenebis(oxamato), Me2pba = 2,2-dimethyl-1,3-propylenbis(oxamato), dpt = 3,3ʹ-diaminodipropylamine, dien = 2,2ʹ-diaminodiethylamine, and Medpt = 3,3ʹ-diamino-N-methyldipropylamine were synthesized and characterized. The crystal structures of 1, 7, and 8 were solved. For complex 1, the trinuclear entities are linked by hydrogen bonds forming a one-dimensional system, and for complex 8, the presence of van der Waals interactions gives a one-dimensional system, too. For complex 7, the trinuclear entities are self-assembled by azido ligands, given a hexanuclear system; each of these hexanuclear entities are self-assembled through two [Na(O)3(H2O)3] octahedral-sharing one-edge entities, given a one-dimensional system. The magnetic behavior of complexes 2-7 was investigated by variable-temperature magnetic susceptibility measurements. Complexes 2-6 exhibit the minimum characteristic of this kind of polymetallic species with an irregular spin state structure. The J value through the oxamato bridge varied between -88 cm (for 6) and-111.2 cm (for 5). For complex 7, the values obtained were J1 = -101.7 cm (through the oxamato ligand) and = -3.2 cm (through the azido ligand).