Hydrothermal synthesis and crystal structures of two NLO compounds, NaIO3•H2O and In(IO3)3

Two metal iodates. (NaIO3H2O)-H-. and In(IO3)(3), have been prepared by hydrothermal reactions at 170 degrees C. The X-ray structural analysis showed that (NaIO3H2O)-H-. crystallizes in a inonoclinic space group C2 with a = 14.175(3) angstrom, b = 3.6688(3) angstrom, c = 9.666(1) angstrom, beta = 124.41 (1)degrees, Z = 4 and In(IO3)(3) in a hexagonal group P6(3) with a = 9.5463(8) angstrom, c= 5.2745(8) angstrom, Z = 2. (NaIO3H2O)-H-. represents anew structure type and it can be viewed as a layered compound consisting of two-dimensional layers of edge-sharing NaO7 monocapped octahedra that are capped by IO3- groups, while In(IO3)(3) S a new compound containing slightly distorted InO6 octahedra that are bridged by IO3- groups giving rise to a three-dimensional polar network. Both compounds crystallize in non-centrosymmetric, chiral space groups. (c) 2005 Elsevier B.V. All rights reserved.