Two cobalt(II) coordination polymers based on carboxylate ligand: Preparation, crystal structures and magnetic properties

Two new coordination polymers, [Co2(L)1.5(OH)(H2O)2]·2H2O (1) and [CoL(bpp)] (2) (H2L = 2,5-dibenzoylterephthalic acid and bpp = 1,3-bis(4-pyridyl)propane), have been synthesized and characterized by elemental analyses, IR spectra, and thermogravimetric analyses. Their structures were determined by single crystal X-ray diffraction analyses. Complex 1 exhibits a 3D framework assembled from tetra-nuclear cobalt-oxygen bridged by carboxylic O atoms with a (412·63) topology. Complex 2 possesses a 2D layered structure which extends into a 3D architecture via C–H···π interaction between propane proton and the phenyl ring or pyridine ring of an adjacent sheets. Furthermore, the magnetic properties of them are discussed.

Graphical abstractTwo new coordination polymers, [Co2(L)1.5(OH)(H2O)2]·2H2O (1) and [CoL (bpp)] (2) (H2L1 = 2,5-dibenzoylterephthalic acid and bpp = 1,3-bis(4-pyridyl)propane), have been synthesized. Complex 1 exhibits a 3D framework assembled from tetranuclear cobalt-oxygen bridged by carboxylic O atoms with a (412·63) topology. 2 possesses a 2D layered structure which extends into a 3D architecture via C–H···π interaction.Figure optionsDownload full-size imageDownload as PowerPoint slide