Synthesis, crystal structure and magnetic properties of a novel Nd(III)-Cu(II) heterometallic coordination polymer based on pyridine-3,5-dicarboxylateand oxalate ligands.

Abstract

A novel 3d–4f heterometallic coordination polymer, {[NdCu(3,5-pdc)2(Oxa)0.5(H2O)8]2H2O}n (3,5- pdc=pyridine-3,5 dicarboxylate, Oxa=oxalate), has been successfully synthesized through slow diffusion in agar-agar gel medium and characterized by X-ray single-crystal diffraction at 100K. The structure is composed of infinite dinuclear chains sandwiching oxalate ligands. The three-dimensional network is ensured by hydrogen bonds involving water molecules and stabilized by π-π* stacking interactions. Magnetic properties of the complex were investigated by variable temperature magnetic susceptibility and reveal the occurrence of overall antiferromagnetic interactions within Nd3+-Nd3+ dinuclear units through the exchange pathway provided by the oxalate bridges.