Cobalt tris(diethyldithiocarbamate) is the coordination complex of cobalt with diethyldithiocarbamate with the formula Co(S<sub>2</sub>CNEt<sub>2</sub>)<sub>3</sub> (Et = ethyl). It is a diamagnetic green solid that is soluble in organic solvents.
Cobalt tris(dithiocarbamate)s are typically are prepared by air-oxidation of mixtures of dithiocarbamate salts and a cobalt(II) nitrate. Cobalt tris(diethyldithiocarbamate) is an octahedral coordination complex of low-spin Co(III) with idealized D<sub>3</sub> symmetry. The Co-S distances are 267 pm.
Oxidation of Co(Et<sub>2</sub>dtc)<sub>3</sub> occurs at mild potentials to give the cobalt(IV) derivative.
Treatment of Co(Et<sub>2</sub>dtc)<sub>3</sub> with fluoroboric acid results in the removal of 0.5 equiv of ligand giving a binuclear cation: