CRYSTAL STRUCTURE OF MONOCLINIC MODIFICATIONS OF ZIRCONIUM AND HAFNIUM TETRAFLUORIDE TRIHYDRATES
R. L. Davidovich, M. A. Pushilin, V. B. Logvinova, A. V. Gerasimenko
Institute of Chemistry, Far Eastern Division, Russian Academy of Sciences, Vladivostok
davidovich@ich.dvo.ru
Keywords: synthesis, zirconium and hafnium tetrafluorides, X-ray crystallographic analysis, crystal structure, hydrogen bonds
Abstract
The monoclinic modification of ZrF4×3H2O, isostructural to HfF4×3H2O, is synthesized and structurally studied for the first time. Unlike the triclinic modification of ZrF4×3H2O with a dimeric structure, the synthesized compound has a polymer structure formed from infinite chains composed of ZrF6(H2O)2 groups sharing F…F edges. The crystal structure of HfF4×3H2O, previously determined by the photo method, is refined. The refined data on the geometric characteristics of the coordination polyhedron of the Hf atom and the system of hydrogen bonds in the structure are obtained.
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