Supramolecular water dimer, (H(2)O)(2), is fundamentally important. During the course of our work on polyoxometalates, we have been able to identify the existence of hydrogen-bonded, near-linear water dimers in the "sinuous" channels of an inorganic framework material, Na(3)(n)(H(2)O)(6)(n)[Al(OH)(6)Mo(6)O(18)](n)() x 2nH(2)O, 1. The three-dimensional network structure of 1 in the solid state is assembled by the Anderson type of heteropolyanions as building blocks sharing sodium cations. Vibrational spectroscopy, X-ray powder diffraction technique, TG-DSC analyses, and single-crystal X-ray structure analysis have characterized this host-guest system, 1. Crystal data for 1: triclinic space group Ponemacr;, a = 12.0618 (3) A, b = 13.1570 (4) A, c = 14.1563 (4) A, alpha = 80.7850 (10) degrees, beta = 75.2660 (10) degrees, gamma = 68.9210 (10) degrees, and Z = 3.

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6n [Al(OH) 6 Mo 6 O 18 ] n ·2nH 2 O are prepared by reaction of Na 2 MoO 4 with an acidified aqueous solution of AlCl 3 (pH 1.8, 20-22°C, 7 d, 68% yield). The samples are characterized by vibrational spectroscopy, powder and single XRD, and TG-DSC analyses. The compound crystallizes in the triclinic space group P1 with Z = 3. It has a three-dimensional framework structure with well-defined "S"-shaped channels. These channels encapsulate supramolecular water dimers as guests furnishing a novel example of a near-linear (H 2 O) 2 cluster in the solid state. -(MANIKUMARI, S.; SHIVAIAH, V.; DAS*, S. K.; Inorg.