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

The title compound, [Co 6 Hg 2 (C 5 H 5 ) 6 (C 5 H 4 Se) 6 ](PF 6 ) 4 ·2CH 3 CN or [Hg 2 (CcSe) 6 ][PF 6 ] 4 ·2CH 3 CN (Cc = C 10 H 9 Co), 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 {Hg 2 Se 6 } core with two bridging Se atoms and four terminal Se atoms.