Poly[hemi(hexa­aqua­zinc) [[μ(2)-1,3-bis­(1,2,4-triazol-1-yl)methane](μ(2)-5-sulfonato­benzene-1,3-dicarboxyl­ato)zinc] sesquihydrate]

The title coordination polymer, {[Zn(H(2)O)(6)](0.5)[Zn(C(8)H(3)O(7)S)(C(5)H(6)N(6))]·1.5H(2)O}(n), synthesized under hydro­thermal conditions, possesses a one-dimensional tube-like chain structure along [100], with octahedral [Zn(H(2)O)(6)](2+) groups ([Image: see text] symmetry) trapped in the pores. The other Zn atom is five-coordinated in a highly distorted trigonal–biyramidal coordin­ation that is defined by two different N atoms from two 1,3-bis­(1,2,4-triazol-1-yl)methane (btrm) ligands and three carboxyl­ate O atoms from 5-sulfonato­benzene-1,3-dicarboxyl­ate ligands. The chains carry negative charges, whereas the free [Zn(H(2)O)(6)](2+) cations are positively charged. The [Zn(H(2)O)(6)](2+) cation is connected with the one-dimensional tubelike chain through weak classical O—H⋯O and O—H⋯N hydrogen-bonding inter­actions as well as through electrostatic inter­actions. One of the two uncoordinated water molecules exhibits half-occupancy.