A novel three-dimensional coordination polymer containing tetranuclear [Co4(μ3-OH)2] building blocks: Synthesis, crystal structure and magnetic behavior of {[Co2(btc)(μ3-OH)(H2O)2] · H2O}n

A cobalt coordination polymer {[Co2(btc)(μ3-OH)(H2O)2] · H2O}n1 (btc = 1,2,4-benzenetricarboxylate) was synthesized hydrothermally and structurally characterized by single-crystal X-ray diffraction method. In 1, the six-coordinated Co(II) ions are held together by two bridging hydroxides to form a tetranuclear [Co4(μ3-OH)2] unit, which are connected further through btc3− ligands in a new μ7-bridging mode to give a porous three dimensional framework. The study of magnetic properties indicated dominant antiferromagnetic coupling interactions between the adjacent Co(II) sites.

Graphical abstractThe Co(II) ions are held together by two bridging hydroxides to form tetranuclear [Co4(μ3-OH)2] units, which are connected further through btc3− (H3btc = 1,2,4-benzene- tricarboxylate) ligands in a new μ7-bridging mode to give a three-dimensional porous framework. The study of magnetic properties indicated dominant antiferromagnetic coupling interactions between the adjacent Co(II) sites.Figure optionsDownload full-size imageDownload as PowerPoint slide