Bis[hexa­aquacobalt(II)] 25,26,27,28-tetra­hydr­oxy-2,8,14,19-tetra­thia­calix[4]arene-5,11,17,23-tetra­sulfonate monohydrate

In the crystal structure of the title compound, [Co(H(2)O)(6)](2)(C(24)H(12)O(16)S(8))·H(2)O, the thia­calix[4]arenetetra­sulfonate (= TCAS(4−)) anions adopt a cone-type conformation with an additional water mol­ecule as a guest mol­ecule in the hydro­phobic cavity. The TCAS(4−) anions are arranged in layers in an up–down fashion. These anionic layers alternate with cationic layers consisting of rather regular octahedral cations (symmetry m). Several medium O—H⋯O hydrogen-bond inter­actions exist between the aqua ligands of the [Co(H(2)O)(6)](2+) cations and the O atoms of the sulfonate groups. In addition to the two crystallographically different Co atoms, two S and four O atoms are situated on mirror planes.