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 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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. |
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ISSN: | 0022-2860 1872-8014 |
DOI: | 10.1016/j.molstruc.2004.08.014 |