Research Article

Raman spectroscopy of gerhardtite at 298 and 77 K

  1. Ray L. Frost1,*,
  2. Peter Leverett2,
  3. Peter A. Williams2,
  4. Matt L. Weier1,
  5. Kristy L. Erickson1

Article first published online: 7 SEP 2004

DOI: 10.1002/jrs.1246

Issue

Journal of Raman Spectroscopy

Journal of Raman Spectroscopy

Volume 35, Issue 11, pages 991–996, November 2004

Additional Information

How to Cite

Frost, R. L., Leverett, P., Williams, P. A., Weier, M. L. and Erickson, K. L. (2004), Raman spectroscopy of gerhardtite at 298 and 77 K. Journal of Raman Spectroscopy, 35: 991–996. doi: 10.1002/jrs.1246

Author Information

  1. 1

    Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia

  2. 2

    School of Science, Food and Horticulture, University of Western Sydney, Locked Bag 1797, Penrith South DC, New South Wales 1797, Australia

*Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.

Publication History

  1. Issue published online: 25 OCT 2004
  2. Article first published online: 7 SEP 2004
  3. Manuscript Accepted: 13 MAY 2004
  4. Manuscript Received: 9 MAR 2004

Funded by

  • Australian Research Council (ARC).

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Keywords:

  • gerhardtite;
  • likasite;
  • copper nitrate;
  • infrared spectroscopy

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 at 77 K indicates a phase change is occurring for the mineral upon cooling to 77 K. Copyright © 2004 John Wiley & Sons, Ltd.

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