{N (1)-[2-(Butyl­selan­yl)benz­yl]-N (2),N (2)-di­methyl­ethane-1,2-di­amine}­dichlorido­mercury(II)

In the title compound, [HgCl(2)(C(16)H(28)N(2)Se)], the primary geometry around the Se and Hg atoms is distorted trigonal–pyramidal and distorted square-pyramidal, respectively. The distortion of the mol­ecular geometry in the complex is caused by the steric demands of the ligands attached to the Se atom. The Hg atom is coordinated through two chloride anions, an N atom and an Se atom, making up an unusual HgNSeCl(2) coordination sphere with an additional long Hg⋯N inter­action. Inter­molecular C—H⋯Cl inter­actions are the only identified inter­molecular hydrogen-bonding inter­actions that seem to be responsible for the self assembly. These relatively weak C—H⋯Cl hydrogen bonds possess the required linearity and donor–acceptor distances. They act as mol­ecular associative forces that result in a supra­molecular assembly along the b-axis direction in the solid state of the title compound.