Synthesis and crystal structures of Cu(II) and Pb(II) aroylhydrazone complexes and magnetic properties of [Cu2(L)2(Cl)2(HO)6] n (HL=2-pyridylaldehyde isonicotinoylhydrazone)

Two novel aroylhydrazones complexes {[Cu2(L)2(Cl)2](H2O)6} n (1), [Pb(L)(CH3COO)] (2), (HL = 2-pyridylaldehyde isonicotinoylhydrazone), were synthesized and structurally characterized by means of X-ray single-crystal diffraction. In complex 1, HL coordinates to Cu(II) using the normal coordination of aroylhydrazone, and also two pyridyl nitrogens forming a coordination polymer. There are strong intermolecular π–π stacking interactions in 2. Magnetism of complex 1 was studied in the temperature range 5–300 K. The results reveal the occurrence of a weak ferromagnetic coupling with J = 0.29 cm−1.