Bis[4-amino-N-(4-methyl­pyrimidin-2-yl-κN³)benzene­sulfonamidato-κN](2,2′-bi­pyridine-κ²N,N′)mercury(II)

The complete mol­ecule of the title complex, [Hg(C₁₁H₁₁N₄O₂S)₂(C₁₀H₈N₂)], is generated by crystallographic twofold symmetry, with the mercury cation lying on the rotation axis. The mercury coordination polyhedron can be described as tetra­hedral (from the N,N′-bidenate bi­pyridine mol­ecule and the sulfonamide N atoms of the sulfamerazine anions) or as squashed trigonal-prismatic, if two long (> 2.80 Å) Hg—N bonds to pyrimidine N atoms are included. The dihedral angle between the aromatic rings in the anion is 73.3 (2)°. In the crystal, N—H...(N,O) and N—H...N hydrogen bonds link the mol­ecules into a three-dimensional network.