5,5′-Diamino-2,2′-bipyridin-1,1′-diium bis(5,5′-diamino-2,2′-bipyridin-1-ium) tetrakis(rac-1,1′-binaphthalene-2,2′-diyl phosphate) hexahydrate: a two-dimensional supramolecular hydrogen-bonded network

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In the title compound, C10H12N42+·2C10H11N4+·4C20H12O4P−·6H2O, the 1,1′-binaphthalene-2,2′-diyl phosphate anion and 5,5′-diamino-2,2′-bipyridine as hydrogen-acceptor and -donor building blocks, respectively, are combined in a supra­molecular two-dimensional hydrogen-bonding network of one centrosymmetric diprotonated diamino­bipyridin-1,1′-ium dication, two monoprotonated diamino­bipyridinium cations, four phosphate counter-anions and six water mol­ecules of crystallization. Protonation of diamino­bipyridine to the bipyridinium mono- or dication enhances the hydrogen bonding due to the primary electrostatic attraction with the anion. The packing can be rationalized by a separation of the hydro­phobic binaphthyl backbone from the hydro­philic (RO)2PO2− phosphate groups, bipyridinium cation and water components. The binaphthyl tail-to-tail packing in the hydro­phobic lamellae as well as the diamino­bipyridinium packing is governed by π–π and C—H⋯π inter­actions.