Two new 2p–3d–4f heterometallic coordination polymers based on 3,5-pyrazoledicarboxylic acid: synthesis, crystal structures and magnetic properties

• Two new 2p–3d–4f heterometallic coordination polymers have been synthesized.
• The pyrazoledicarboxylate ligand has been found in two different coordinated modes.
• Magnetic properties of the complexes have been investigated in detail.

Two new 2p–3d–4f heterometallic coordination polymers, [NaCuGd(pdc)2(H2O)7 ∙ 2H2O]n (1) and [NaCuEu(pdc)2(H2O)7 ∙ 2H2O]n (2), have been synthesized based on 3,5-pyrazoledicarboxylic acid (H3pdc). Single-crystal X-ray diffraction analysis reveals that complexes 1−2 are isostructural and both of them display an infinite two-dimensional brickwall-like layer structure consisting of three metal ions and bridged pyrazoledicarboxylate ligands. Magnetic properties of the complexes have been investigated in detail. Furthermore, free-ion approximation was used to fit the magnetic data and a good theory-experiment agreement was obtained for both 1 and 2.

Complexes 1−2 are isostructural and they both display 2D brickwall-like layer structure with the pyrazoledicarboxylate bridged ligand in two different coordinated modes.Figure optionsDownload as PowerPoint slide