Journal of Solution Chemistry

, Volume 37, Issue 10, pp 1411–1418

The Structure of Gallium in Strongly Alkaline, Highly Concentrated Gallate Solutions—a Raman and 71Ga-NMR Spectroscopic Study

Article

DOI: 10.1007/s10953-008-9314-y

Cite this article as:
Sipos, P., Megyes, T. & Berkesi, O. J Solution Chem (2008) 37: 1411. doi:10.1007/s10953-008-9314-y

Abstract

Highly concentrated alkaline gallate solutions with 0.23≤[Ga(III)]T≤2.32 mol⋅dm−3 and 1≤[NaOH]T≤15 mol⋅dm−3 have been prepared and investigated by Raman and 71Ga-NMR spectroscopy. Both the Raman and 71Ga-NMR spectra are consistent with the presence of only one Ga-bearing species in these solutions, the tetrahedral hydroxocomplex, Ga(OH)4. Contact ion pairs were found to cause variations in the Raman and 71Ga-NMR parameters that are at the edge of detectability. Other species that have been claimed to exist in the literature, like higher hydroxo complexes (i.e., Ga(OH)63−) or the μ-oxo-bridged dimer (i.e., (OH)3Ga-O-(OH)32−), were not detected by these spectroscopic techniques. If such solution species exist at all, their concentrations are below the detection limit of Raman and 71Ga-NMR spectroscopy. The behavior of gallium appears to be very similar to that of aluminium under identical conditions, except that the dimeric species detected in aluminate solutions is undetectable in analogous gallates.

Keywords

Gallium Solution structure Concentrated electrolyte solutions Hydroxo complexes Ga(OH)4 Raman spectroscopy Ion pairs 71Ga-NMR spectroscopy Bayer liquors 

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Department of Inorganic and Analytical ChemistryUniversity of Szeged, Research Group for Environmental Chemistry, ReGEChSzegedHungary
  2. 2.Chemical Research Centre, Institute of ChemistryHungarian Academy of SciencesBudapestHungary
  3. 3.Department of Physical ChemistryUniversity of SzegedSzegedHungary

Personalised recommendations