New isoformula iodates In(IO{sub 3}){sub 3} and Sm(IO{sub 3}){sub 3} with different crystal structures: Specific structural features of I{sup 5+} compounds
- Lomonosov Moscow State University, Department of Crystallography and Crystal Chemistry, Faculty of Geology (Russian Federation)
New iodates, namely, In(IO{sub 3}){sub 3} (space group R3-bar) and Sm(IO{sub 3}){sub 3} (space group P2{sub 1}/a), are synthesized under hydrothermal conditions. The original crystal structure of the In(IO{sub 3}){sub 3} compound is determined without prior knowledge of the chemical formula. The Sm(IO{sub 3}){sub 3} compound is isostructural to the Gd(IO{sub 3}){sub 3} compound. The [IO{sub 4}]{sup 3-} tetrahedra with three short I-O bonds have an umbrella coordination, which is characteristic of pentavalent iodine, and form anionic radicals, such as a ring radical in the In(IO{sub 3}){sub 3} iodate, a triple helix in the isoformula compound Fe(IO{sub 3}){sub 3}, a complex chain in the Sm(IO{sub 3}){sub 3} iodate, and a linear triortho group in the Sm(IO{sub 3}){sub 3}.H{sub 2}O compound. All radicals contain triortho groups. The structural differences are determined by different ionic radii and shapes of the coordination polyhedra of the cations (indium and iron octahedra and an eight-vertex samarium polyhedron)
- OSTI ID:
- 21090668
- Journal Information:
- Crystallography Reports, Vol. 53, Issue 1; Other Information: DOI: 10.1134/S1063774508010057; Copyright (c) 2008 Nauka/Interperiodica; Article Copyright (c) 2008 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7745
- Country of Publication:
- United States
- Language:
- English
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