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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.

acta crystallographica. section e

[1,2-Bis(dicyclohexylphosphanyl)-1,2-dicarba-closo-dodecaborane-2κ2P,P′]di-μ-chlorido-1:2κ4Cl:Cl-dichlorido-1κ2Cl-dimercury(II)