Crystal Structure and Chemistry of a Complex Indium Phosphate Framework Material, (Ethylenediammonium)In3P3O12(OH)2. -The title compound is obtained from a gel of InCl3, H3PO4, SiO2, en, and H2O (200-225°C, 4-10 d). the product is characterized by single crystal XRD, SEM, IR, and NMR spectroscopy. (enH2)In3P3O12(OH)2 crystallizes in the monoclinic space group C2/m with Z = 4. The structure consists of a complex open framework of edge-and corner-sharing of InO 6 octahedra and PO4 tetrahedra with cavities occupied by the organic ammonium ions. -(BROACH*, R. W.; BEDARD, R. L.; KING, L. M.; PLUTH, J. J.; SMITH, J. V.; KIRCHNER, R. M.; J. Solid State Chem. 196 (2012) 341-348, http://dx.