Hydrothermal synthesis and characterization of a new organically templated three-dimensional open-framework gallium phosphate-phosphite (C6N2H18)2(C6N2H17)Ga15(OH)8(PO4)2(HPO4)12(HPO3)6•2H2O

Using H3PO3 as a phosphorus source and oxalic acid as a reducing agent, the first three-dimensional open-framework gallium phosphate-phosphite formula as (C6N2H18)(2)(C6N2H17)Ga-15(OH)(8)(PO4)(2)(HPO4)(12)(HPO3)(6)center dot 2H(2)O (1), has been hydrothermally synthesized in the presence of N,N,N',N'-tetramethylenediamine (TMEDA) as a structure-directing agent. Compound 1 crystallizes in trigonal system with space group P - 3, a = b= 19.046(3) angstrom, c = 8.3306(17) angstrom, gamma = 120 degrees, V= 2617.1(7) angstrom(3), and Z = 1. Its 3-D network is based on alternated Ga-centered (GaO4 tetrahedra, GaO5 trigonal bipyramids, and GaO6 octahedra) and P-centered (PO43-, HPO42- and HPO32-) units. Protonated organic amines and water molecules are located in the 12-membered ring channels. (C) 2010 Elsevier Masson SAS. All rights reserved.