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

Frost, Ray L. and Carmody, Onuma and Erickson, Kristy L. and Weier, Matt L. and Henry, Dermot O. and 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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DOI : 10.1016/j.molstruc.2004.08.014

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.

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
ISSN:	0022-2860
Subjects:	Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions:	QUT Faculties and Divisions > Faculty of Science
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:	03 Dec 2008 12:09

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