Di‐μ2‐sulfito‐κ8O,O′:O′,O′′‐bis[(2,4,6‐tri‐2‐pyrid­yl‐1,3,5‐triazine‐κ3N2,N1,N6)cadmium(II)] octa­hydrate

The title compound, [Cd₂(SO₃)₂(C₁₈H₁₂N₆)₂]·8H₂O, is a dimer built up around a symmetry center, where the sulfite anion displays a so far unreported coordination mode in metal‐organic complexes; the anion binds as a μ₂‐sulfite‐κ⁴O,O′:O′,O′′ ligand to two symmetry‐related seven‐coordinate Cd^II cations, binding through its three O atoms by way of two chelate bites with an O atom in common, which acts as a bridge. The cation coordination is completed by a 2,4,6‐tri‐2‐pyridyl‐1,3,5‐triazine ligand acting in its usual tridentate mode.