Synthesis and thermal stability study of a cobalt-organic framework with tetrahedral cages

•Co-bipyrazole-dicarboxylates MOFs;•porous framework based Co ions•three-dimensional structure with tetrahedral cages;•high thermal stability.

A new stable cobalt-organic framework, namely [Co2(oba)2(H2Me4bpz)]n (1) (H2oba = 4.4′-oxydibenzoic acid, H2Me4bpz = 3.3′,5,5′-tetramethyl-4,4′-bipyrazole), has been synthesized by combining the mixed H2oba and H2Me4bpz with Co(CH3COO)2·4H2O under solvothermal conditions, which was characterized by infrared spectroscopy, single-crystal X-ray diffraction, powder X-ray diffraction, and thermogravimetric analyses. Single-crystal X-ray diffraction analysis reveals that 1 features a three-dimensional framework, which is built from interesting tetrahedral cages. The thermal stability of the complex has also been investigated.

Graphical abstractA new stable metal-organic framework, namely [Co2(oba)2(H2Me4bpz)]n (H2oba = 4.4′-oxydibenzoic acid, H2Me4bpz = 3.3′,5,5′-tetramethyl-4,4′-bipyrazole), has been synthesized and its thermal stability was explored.Figure optionsDownload full-size imageDownload as PowerPoint slide