Uranyl(VI) compounds. 3. Crystal structures of two forms of bis(urea)dioxouranium(VI) sulfate

Autor:	J. Toivonen, L. Niinistoe
Rok vydání:	1983
Předmět:	Inorganic Chemistry chemistry.chemical_compound Crystallography Molecular geometry Pentagonal bipyramidal molecular geometry chemistry Hydrogen bond Molecule Crystal structure Physical and Theoretical Chemistry Sulfate Uranyl sulfate Uranyl
Zdroj:	Inorganic Chemistry. 22:1557-1559
ISSN:	1520-510X 0020-1669
DOI:	10.1021/ic00152a027
Popis:	The structures of the ..cap alpha.. and ..beta.. forms of the title compound UO/sub 2/SO/sub 4/.2CO(NH/sub 2/)/sub 2/ are similar. The uranium atom lies at the center of a pentagonal bipyramid formed by the oxygen atoms. Of the 5 equatorial oxygens, 3 belong to sulfate groups and two to urea molecules. The bridging tridentate sulfate groups join the bipyramids into infinite double chains in the same fashion as in uranyl sulfate hydrates. Selected interatomic distances and angles are listed. The distances and angles in UO/sub 7/ polyhedra are in close agreement with values reported for other related uranyl sulfates. The U-O (uranyl) bond distances in the ..cap alpha.. form are unusually long, exceeding 1.8 A. The U-O (urea) distances in the ..beta.. are slightly longer than in the ..cap alpha.. form. The orientation of the planar area molecules is different in the 2 forms. The urea molecules are involved in the hydrogen bonding within and between the chains. The main structural difference between the 2 forms lies in the packing of the chains. The packing efficiency is slightly greater in the ..cap alpha.. form as the unit cell volume is 2.3% smaller. 2 figures, 5 tables.
Databáze:	OpenAIRE
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