Bis(μ-cobaltoceniumseleno-late-1:2κ2 Se:Se)bis[bis-(cobaltoceniumseleno-late-κSe)mercury(II)] tetra-kis-(hexa-fluorido-phosphate) aceto-nitrile disolvate.

The title compound, [Co6Hg2(C5H5)6(C5H4Se)6](PF6)4·2CH3CN or [Hg2(CcSe)6][PF6]4·2CH3CN (Cc = C10H9Co), was obtained as bright-orange needle-shaped crystals. It is a salt containing a tetra-cationic dimercury species with six cobaltoceniumseleno-late ligands, four hexa-fluorido-phosphate counter-ions and two aceto-nitrile solvent mol-ecules. The cation (point group ) has a bi-tetra-hedral {Hg2Se6} core with two bridging Se atoms and four terminal Se atoms.