Copper extractant strength: the effect of substituents in the 3-position on hydroxyoxime performance

Forgan, R.S. , Henderson, D.K., Mcallister, F.E., Tasker, P.A., White, F.J., Campbell, J. and Swart, R.M. (2008) Copper extractant strength: the effect of substituents in the 3-position on hydroxyoxime performance. Canadian Metallurgical Quarterly, 47(3), pp. 293-300. (doi:10.1179/000844308794408218)

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Abstract

The synthesis and study of a systematic series of phenolic oximes have shown that substitution in the 3-position can greatly affect extractive efficacy. Solid state, solution and gas phase analytical techniques including X-ray crystallography, Electron Paramagnetic Resonance (EPR) and IR spectroscopy and collision induced dissociation mass spectrometry have been assessed for their applicability in interpreting the origins of differences in extractant strength. The dominant substituent effect on pH(0.5) is the change in ligand pK(a), with the more acidic ligands being stronger extractants. The influence of the 3-substituent on the stabilizing intracomplex H-bonding of their copper(II) complexes also affects extractant strength. The 3-NO2 substituted ligand shows the lowest pH(0.5) value due to a combination of its low pK(a) and a stabilising bifurcated H-bond assembly around the copper(II) centre. Appending an aminomethyl group to the 3-position gives a ligand capable of binding a metal and its attendant anion(s). These metal salt reagents show potential to open up new flowsheets for the processing of high tenor copper feeds.

Item Type:Articles
Additional Information:John Dutrizac International Symposium on Copper Hydrometallurgy, Toronto, Canada, 2007
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Forgan, Dr Ross
Authors: Forgan, R.S., Henderson, D.K., Mcallister, F.E., Tasker, P.A., White, F.J., Campbell, J., and Swart, R.M.
Subjects:Q Science > QD Chemistry
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Canadian Metallurgical Quarterly
ISSN:0008-4433
ISSN (Online):1879-1395

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