Molecular structure of the uranyl mineral uranopilite—a Raman spectroscopic study

Raman spectroscopy of the mineral uranopilite at 298 and 77 K has been obtained and used to elucidate the structure of the mineral at the molecular level. A single intense band at 1010 cm −1 is assigned to the ν 1 (SO 4) 2− symmetric stretching mode. Three low intensity bands in the 298 K Raman spec...

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Published in:Journal of molecular structure 2005-01, Vol.733 (1), p.203-210
Main Authors: Frost, Ray L., Carmody, Onuma, Erickson, Kristy L., Weier, Matt L., Henry, Dermot O., Čejka, Jirí
Format: Article
Language:English
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Summary:Raman spectroscopy of the mineral uranopilite at 298 and 77 K has been obtained and used to elucidate the structure of the mineral at the molecular level. A single intense band at 1010 cm −1 is assigned to the ν 1 (SO 4) 2− symmetric stretching mode. Three low intensity bands in the 298 K Raman spectrum are observed at 1143, 1117 and 1097 cm −1 and in the 77 K spectrum four bands at 1148, 1130, 1118 and 1106 cm −1. These bands are attributed to the ν 3 antisymmetric stretching modes. A series of infrared bands are found at 1559, 1540, 1526 and 1511 cm −1 attributed to δ UOH bending modes. Three bands are observed at 843, 835 and 819 cm −1 in both 298 and 77 K spectra attributed to the ν 1 symmetric stretching modes of the (UO 2) 2+ units. In the infrared spectra bands are observed at 941, 929 and 910 cm −1 and are assigned to the ν 3 antisymmetric stretching modes of the UO 2 units. These values are used to calculate UO bond distances. Multiple OH stretching modes prove a complex arrangement of OH groupings, i.e. water molecules and OH − ions, and hydrogen bonding in the crystal structure of uranopilite.
ISSN:0022-2860
1872-8014
DOI:10.1016/j.molstruc.2004.08.014