catena-Poly[mercury(II)-di--chloro--pyridazine-? 2 N:N']

The crystal structure of [HgBr2(Pyo)]n (Pyo = pyridazine, C4H4N2) consists of strands of octahedrally coordinated mercuric centers asymmetrically bridged by bromide and connected by the two neighboring N atoms of pyridazine mol­ecules to complete the octahedral coordination of mercury. The Hg atoms lie on inversion centers.