title: 1,1'-[(Biphenyl-4,4'-di-yl)bis-(methyl-ene)]di-1H-imidazol-3-ium tetra-chlorido-mercurate(II).
abstract: In the title compound, (C(20)H(20)N(4))[HgCl(4)], the Hg(II) ion is four-coordinated in a tetra-hedral environment defined by four chloride ions. The dihedral angle between the two phenyl rings is 32.83 (15)°. The protonated 1,1'-[(biphenyl-4,4'-di-yl)bis-(meth-yl-ene)]di-1H-imidazol-3-ium cations, showing a cis conformation, link the [HgCl(4)](2-) anions into an R(4) (4)(42) motif via N-H⋯Cl hydrogen bonds.
authors.forename: Bo
authors.initials: B
authors.lastname: Wen
authors.forename: Guang-Feng
authors.initials: GF
authors.lastname: Hou
authors.forename: Ying-Hui
authors.initials: YH
authors.lastname: Yu
authors.forename: Jin-Sheng
authors.initials: JS
authors.lastname: Gao