In situ deca­rbonylation of N,N-di­methyl­formamide to form di­methyl­ammonium cations in the hybrid framework compound {[(CH(3))(2)NH(2)](2)[Zn{O(3)PC(6)H(2)(OH)(2)PO(3)}]}(n)

The title phospho­nate-based organic–inorganic hybrid framework, poly[bis(dimethylammonium) [(μ(4)-2,5-dihydroxybenzene-1,4-diphosphonato)zinc(II)]], {(C(2)H(8)N)(2)[Zn(C(6)H(4)O(8)P(2))]}(n), was formed unexpectedly when di­methyl­ammonium cations were formed from the in situ deca­rbonylation of the N,N-di­methyl­formamide solvent. The framework is built up from ZnO(4) tetra­hedra and bridging di­phospho­nate tetra-anions to generate a three-dimensional network comprising [100] channels occupied by the (CH(3))(2)NH(2) (+) cations. Within the channels, an array of N—H⋯O hydrogen bonds help to establish the structure. In addition, intra­molecular O—H⋯O hydrogen bonds between the appended –OH groups of the phenyl ring and adjacent PO(3) (2−) groups are observed.