Raman spectroscopic study of the uranyl selenite mineral marthozite Cu[(UO2)3(SeO3)2O2].8H2O
Frost, Ray L., Cejka, Jiri, Keeffe, Eloise C., & Dickfos, Marilla J. (2008) Raman spectroscopic study of the uranyl selenite mineral marthozite Cu[(UO2)3(SeO3)2O2].8H2O. Journal of Raman Spectroscopy, 39(10), pp. 1413-1418.
The mineral marthozite, a uranyl selenite, has been characterised by Raman spectroscopy at 298 K. The bands at 812 and 797 cm-1 were assigned to the symmetric stretching modes of the (UO2)2+ and (SeO3)2- units, respectively. These values gave calculated U-O bond lengths in uranyl of 1.799 and/or 1.814 Å. Average U-O bond length in uranyl is 1.795 Å, inferred from the X-ray single crystal structure analysis of marthozite by Cooper and Hawthorne. The broad band at 869 cm-1 was assigned to the ν3 antisymmetric stretching mode of the (UO2)2+ (calculated U-O bond length 1.808 Å). The band at 739 cm-1 was attributed to the ν3 antisymmetric stretching vibration of the (SeO3)2- units. The ν4 and the ν2 vibrational modes of the (SeO3)2- units were observed at 424 cm-1 and 473 cm-1. Bands observed at 257, and 199 and 139 cm-1 were assigned to OUO bending vibrations and lattice vibrations, respectively. O-H..O hydrogen bond lengths were inferred using the Libowiztky's empirical relation. The infrared spectrum of marthozite was studied for complementation.
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