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Original scientific paper

On the Structure .and Symmetry of the Phosphate Ions in Some Calcium Phosphates

B. Šoptrajatov ; Department of Chemistry, Faculty of Science, University· of Skopje, $kopje, .Macedonia, Yugoslavia
I. Petrov ; Department of Chemistry, Faculty of Science, University· of Skopje, $kopje, .Macedonia, Yugoslavia


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Abstract

The infrared Spectra, ·recorded at room-temperature and at
7711K, bf some calcium ' orthophosphates (anhydrous dicalcium .
phosphate, dicalcium phosphate dihydrate and octacalcium phosphate)
have been analysed, particularly with respect to the site
symmetry of the phosphate ions. .
Whereas ·the free phosphate ion exhibits Ta symmetry, C3v
symmetry could be expected for the hydrogen phosphate ion,
HPQ~.- . Ho'fever, in the solid state the site symmetry of the
phosphate ions of the analysed compounds is apreciably lowered
as inferred from the fact that the degeneracies of all vibrational
modes have been removed and all modes are infrared active. This
could correspond fo the Cs or Ci symmetry groups for which the
selection rules and · activities are identical. It was concluded that,
on the basis of the present information, it is not possible to distinguish
between these two symmetry groups.

Keywords

Hrčak ID:

208106

URI

https://hrcak.srce.hr/208106

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