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

Frost, Ray L., Carmody, Onuma, Erickson, Kristy L., Weier, Matt L., Henry, Dermot O., & Cejka, Jiri (2005) Molecular structure of the uranyl mineral uranopilite-a Raman spectroscopic study. Journal of Molecular Structure, 733(1-3), pp. 203-210.

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Abstract

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 ν1 (SO4)2- symmetric stretching mode. Three low intensity bands in the 298 K Raman spectrum are observed at 1143, 1117 and 1097 cm-1and in the 77 K spectrum four bands at 1148, 1130, 1118 and 1106 cm-1. These bands are attributed to the ν3 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 ν1 symmetric stretching modes of the (UO2)2+ units. In the infrared spectra bands are observed at 941, 929 and 910 cm-1 and are assigned to the ν3 antisymmetric stretching modes of the UO2 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.

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ID Code: 819
Item Type: Journal Article
Additional Information: Note: Co-author Dermott Henry is affiliated with Museum Victoria, Geosciences ,Melbourne. Co-author Jiri Cejka is affiliated with National Museum, Czech Republic.
Keywords: uranopilite, johannite, zippeite, uranyl sulphate minerals, dehydroxylation, dehydration, infrared and Raman spectroscopy
DOI: 10.1016/j.molstruc.2004.08.014
ISSN: 0022-2860
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2004 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher: This journal is available online.
Deposited On: 25 Oct 2005
Last Modified: 29 Feb 2012 23:13

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