Synthesis, crystal structure and magnetic properties of two coordination polymers with 4-(4-carboxyphenyl)-4,2′:6′,4″-terpyridine ligand

•Two 1D 4-cptpy coordination polymers were prepared.•Complex 1 displays 3D supramolecular framework in which 4-cptpy exists as a guest.•Complex 2 is a linear chain coordination polymer with quadrangled pores.•Complex 1 exhibits an antiferromagnetic interaction in (μ-O2CR)2Mn2 core.

MnII and CoII salts reacting with 4-(4-carboxyphenyl)-4,2′:6′,4″-terpyridine (4-Hcptpy) in DMF/H2O afford two complexes, [Mn(4-cptpy)(DMF)(H2O)2]n·n(4-cptpy)·nDMF (1) and [Co(4-cptpy)2(H2O)2]n (2). Complex 1 is a 1D ribbon coordination polymer assembled by Mn2 dimer and tridentate 4-cptpy ligand. The guest 4-cptpy anion is embedded in 3D supramolecular architecture with strong hydrogen bonds. Complex 2 is a 1D linear chain coordination polymer with quadrangled pores. The complex 1 releases H2O and DMF in 87–150 °C, and the anhydrous [Mn(4-cptpy)]n·n(4-cptpy) remains thermally stable until 403 °C. Variable temperature magnetic susceptibility study in 2–300 K proves that a weak antiferromagnetic interaction exists in the (μ-O2CR)2Mn2 core.

Graphical abstractTwo MnII/CoII 1D coordination polymers were constructed from 4-(4-carboxyphenyl)-4,2′:6′,4″-terpyridine. [Mn(4-cptpy)(DMF)(H2O)2]n·n(4-cptpy)·nDMF displays interesting supramolecular framework in which uncoordinated 4-cptpy exists as guest molecule. Its magnetic properties and thermal stability have been studied.Figure optionsDownload full-size imageDownload as PowerPoint slide