The Das cubane is a transition metal carboxylate complex with the formula [CoO(OAc)py]4 where OAc is acetate and py is pyridine.

The compound is named after Birinchi K. Das, who led the team that discovered the cluster.

Each Co(III) center is low-spin and has octahedral geometry.

The compound is prepared by mixing a cobalt(II) salt with acetate and pyridine followed by oxidation with hydrogen peroxide.

[1] Cobalt(III) carboxylates have attracted interest as catalysts for the oxidation of xylene to terephthalic acid.