A Cobalt(II)‐containing Metal‐Organic Framework Showing Catalytic Activity in Oxidation Reactions

Abstract

Abstract A metal‐organic framework (MOF) containing redox active Co II atoms, [Co II (BPB)]·3DMF (1) , has been prepared from the solvothermal reaction of Co II nitrate and 1,4‐bis(4′‐pyrazolyl)benzene (H 2 ‐BPB) in dimethylformamide (DMF). Compound 1 constitutes a porous coordination framework that is built up by interconnecting 1D Co II polymer chains with (BPB) 2− ligands. The thermal stability of 1 was investigated by thermogravimetric (TG) analysis and variable‐temperature X‐ray powder diffraction (VTXRPD), which indicate that the framework of 1 is stable upon removal of solvent molecules. The argon adsorption isotherm of 1 at 77 K indicates a porous structure with a BET surface area of 1207 m 2 /g. As a test reaction for catalytic activity of 1 , the oxidation of cyclohexene was examined employing tert‐butyl hydroperoxide as oxidant. The maximum substrate conversion achieved after 12 h was 62 % with an estimated turn‐over number (TON) of 44 based on the number of converted substrate molecules (cyclohexene) per Co II atom.

Keywords

Affiliated Institutions

• Universität Ulm DE
• Bayer (Germany) DE

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