2,3,6,7,10,11-Hexahydroxytriphenylene tetrahydrate: a new form of an important starting material for supramolecular chemistry and covalent organic frameworks

In the title compound, C18H12O6·4H2O, the 2,3,6,7,10,11-hexa­hydroxy­triphenyl­ene mol­ecule is located on a twofold axis and two water mol­ecules occupy general positions. The compound forms (4,4) two-dimensional nets via hydrogen bonds between neighbouring hexa­hydroxy­triphenyl­ene mol­ecules, somewhat similar to the cyclo­penta­none solvates but distinctively different from the monohydrate form. Hydrogen bonds to water mol­ecules connect these layers to form a complicated three-dimensional net, supported also by strong π–π stacking.