Raman spectroscopy of gerhardtite at 298 and 77 K

Frost, Ray L. and Leverett, Peter and Williams, Peter A. and Weier, Matt L. and Erickson, Kristy L. (2004) Raman spectroscopy of gerhardtite at 298 and 77 K. Journal of Raman Spectroscopy, 35(11). pp. 991-996.

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DOI : 10.1002/jrs.1246

Abstract

Raman spectroscopy has been used to study the nature of gerhardtite, a naturally occurring basic copper(II) nitrate of formula Cu2NO3(OH)3. Raman spectra at 77 K show four bands at 3557, 3548, 3467 and 3409 cm-1 in accordance with the crystal structure with three non-equivalent hydroxyl groups. Estimations of hydrogen bond distances of 0.3019, 0.2987, 0.2855 and 0.2804 pm are obtained. Cooling to liquid nitrogen temperatures did not affect these values. Two bands are observed at 1048 and 1052 cm-1 in the NO3 stretching region. Cooling to liquid nitrogen temperature altered the ratio of these nitrates from 3/1 to 1/3. Two sets of bands in the antisymmetric stretching region of the nitrate in the 77 K spectra suggest that there are two non-equivalent nitrate anions in the gerhardtite structure at liquid nitrogen temperature. X-ray crystallography suggests three independent oxygens in the one nitrate group. The shift in band positions on obtaining Raman spectra at 298 and 77 K indicates a phase change is occurring for the mineral upon cooling to 77 K.

ID Code:	815
Item Type:	Journal Article
Additional Information :	For more information, please refer to the journal's website (see hypertext link) or contact the author. Note: Co-authors Peter Leverett and Peter Williams are affiliated with the School of Science, Food and Horticulture, University of Western Sydney.
Keywords :	gerhardtite, likasite, copper nitrate, Raman spectroscopy, infrared spectroscopy
ISSN:	0377-0486
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 John Wiley & Sons
Deposited On:	14 Mar 2005
Last Modified:	03 Dec 2008 12:09

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