Hydrothermal synthesis and crystal structure of strontium iodate, Sr(IO3)2

Strontium iodate, Sr(IO3)2, has been prepared by hydrothermal reactions at 170 deg. C. The X-ray single-crystal structural analysis showed that it crystallizes in a new structure type with space group P1-bar, a=7.0130(7) A, b=7.0520(8) A, c=13.088(1) A, α=84.12(1) deg., β=84.80(1) deg., γ=63.48(1) deg., Z=4, R1/wR2=0.0442/0.1019 for 2109 observed reflections and 158 parameters. The crystal structure of Sr(IO3)2 consists of pyramidal IO3- anions and Sr2+ cations, which are alternately arranged along the a-axis in a 2:1 ratio to form a layer-like structure. Infrared spectra further confirmed that the compound contains low symmetric IO3- groups