Supramolecular assembly based on a heteropolyanion: Synthesis and crystal structure of Na3(H2O)6[Al(OH)6Mo6O18]×2H2O

Synthesis and structural characterization of a polyoxometalate compound Na3(H2O)6 Al(OH)6Mo6O182H2O (1) have been described. Compound 1 exhibits three-dimensional network structure in the solid state, which is assembled by Anderson-type heteropolyanions,Al(OH)6Mo6O18]n 3n–, as building blocks sharing sodium cations. 1 possesses “sinuous” channels occupied by supramolecular water dimers as guests. Anderson anions, sodium-coordinated water and crystal water are additionally involved in an intricate hydrogen-bonding network in the crystal of 1.