NDLI: Dimensionality variations in new zirconium iodates: hydrothermal syntheses, structural determination, and characterization of $BaZr(IO_{3})_{6}$ and $K_{2}Zr(IO_{3})

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ahn, Hyun Sun Lee, Dong Woo Ok, Kang Min
Description	Author Affiliation: Ahn HS ( Department of Chemistry, Chung-Ang University, Seoul, 156-756, Republic of Korea. kmok@cau.ac.kr.)
Abstract	Two new quaternary zirconium iodates, $BaZr(IO_{3})_{6}$ and $K_{2}Zr(IO_{3})_{6},$ have been synthesized through hydrothermal reactions using $BaCO_{3}$ (or $K_{2}CO_{3}),$ $ZrO_{2},$ and $HIO_{3}$ as reagents. Single crystal and powder X-ray diffraction were used to determine crystal structures of the compounds. $BaZr(IO_{3})_{6}$ exhibits infinite bands that are composed of $ZrO_{7}$ pentagonal bipyramids and $IO_{3}$ trigonal pyramids, in which $Ba^{2+}$ cations are sandwiched by the bands. $K_{2}Zr(IO_{3})_{6}$ exhibits a molecular structure that is composed of $ZrO_{6}$ octahedra and $IO_{3}$ groups. The dimensionality variations seem to be attributable to the flexible coordination numbers of $Zr^{4+}$ cations with large ionic radii as well as the number of counter cations. Both of the materials are thermally stable up to approximately 440–450 °C and decompose to the corresponding metal zirconium oxides above these temperatures. The band gaps for $BaZr(IO_{3})_{6}$ and $K_{2}Zr(IO_{3})_{6}$ are calculated to be 3.1 and 3.0 eV, respectively, using the (K/S)-versus-E plots obtained from the UV-vis diffuse reflectance spectra. Infrared spectra and local dipole moment calculations are also presented.
ISSN	14779226
Issue Number	27
Journal	Dalton Trans.
Volume Number	43
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2014-07-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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