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.

Graphical abstractComplexes 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 full-size imageDownload as PowerPoint slide