An anisaldehyde sodium bis­ulfite derivative: poly[[μ₄-(hy­droxy)(4-meth­oxy­phenyl)methane­sulfonato]­sodium]

The title complex, [Na(C₈H₉O₅S)]_n, is polymeric and consists of broad layers parallel to (100) made up of an inner hydro­philic core of Na⁺ cations and polar SO₃C(OH)– groups, padded on both sides by two hydro­phobic layers of pendant meth­oxy­phenyl groups. The Na⁺ cations in the inner core are six-coordinated into highly distorted NaO₆ octa­hedra by four symmetry-related (hy­droxy)(4-meth­oxy­phenyl)methane­sul­fon­ate anions, leading to a tightly woven two-dimensional structure. While there are some hydrogen bonds providing inter­planar cohesion, inter­actions between adjacent layers are weak hydro­phobic ones. The present compound appears to be the first reported structure containing the (hy­droxy)(4-meth­oxy­phenyl)methane­sulfonate ligand.