Synthesis, spectral and magnetical characterization of monomeric [Cu(2-NO2bz)2(3-pyme)2(H2O)2] and polymeric [Cu{3,5-(NO2)2bz}2(3-pyme)2]n

Both complexes exhibit very similar π-π stacking of 3-pyridylmethanol and nitrobenzoato ligands, but the magnetic moment temperature dependence of both complexes is different. Very weak antiferromagnetic interactions transmitted probably through π-π stacking were evaluated for both complexes and for complex (1), results in a small decrease of magnetic moment below the 5 K temperature. Weak ferromagnetic interactions of magnetic centres within the chain structure of (2) are somewhat stronger than the mentioned antiferromagnetic contribution.