[1,2-Bis(di­cyclo­hexyl­phosphan­yl)-1,2-dicarba-closo-dodeca­borane-2κ(2) P,P′]di-μ-chlorido-1:2κ(4) Cl:Cl-di­chlorido-1κ(2) Cl-dimercury(II)

The title compound, [Hg(2)Cl(4)(C(26)H(54)B(10)P(2))], was synthesized by the reaction of 1,2-bis­(di­cyclo­hexyl­phosphan­yl)-1,2-dicarba-closo-dodeca­borane with HgCl(2). Both Hg(II) atoms show a distorted tetra­hedral coordination geometry, provided by the two bridging chloride anions and the P atoms of the diphosphanyl ligand for one metal atom, and by two bridging and two terminal chloride anions for the other. The five-membered HgP(2)C(2) chelate ring assumes an envelope conformation, with the Hg(II) atom displaced by 0.1650 (5) Å from the mean plane of the other four atoms (r.m.s. deviation = 0.002 Å). In the crystal, B—H⋯Cl interactions link the molecules, forming a supramolecular chain along the a-axis direction.