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Interactions between Sulfide Minerals and Alkylxanthate Ions .1. A Vibrational Spectroscopic Study of the Interactions between Sphalerite and Synthetic Zinc(Ii) and Cadmium(Ii) Sulfides, and Ethylxanthate Ions in Aqueous and Acetone Solutions

Persson, Per LU ; Malmensten, B. and Persson, I. (1991) In Journal of the Chemical Society, Faraday Transactions 87. p.2769-2777
Abstract
The crystal structures of zinc(II) and cadmium(II) sulphides are not affected by the stoichiometry of metal and sulphide ions at the precipitation of the two compounds. The composition and structure of the ultimate surface layers, and thereby the chemical properties of the particles, are on the other hand sensitive to the stoichiometry at the preparation. Chemisorbed ethylxanthate complexes are formed at metal ion sites on the surfaces of sphalerite and synthetic zinc(II) and cadmium(II) sulphides at metal and ethylxanthate ion concentrations where the solubility product of zinc(II) or cadmium(II) ethylxanthate is not exceeded. Two different types of ethylxanthate species co-ordinated to the surfaces have been found. These have been... (More)
The crystal structures of zinc(II) and cadmium(II) sulphides are not affected by the stoichiometry of metal and sulphide ions at the precipitation of the two compounds. The composition and structure of the ultimate surface layers, and thereby the chemical properties of the particles, are on the other hand sensitive to the stoichiometry at the preparation. Chemisorbed ethylxanthate complexes are formed at metal ion sites on the surfaces of sphalerite and synthetic zinc(II) and cadmium(II) sulphides at metal and ethylxanthate ion concentrations where the solubility product of zinc(II) or cadmium(II) ethylxanthate is not exceeded. Two different types of ethylxanthate species co-ordinated to the surfaces have been found. These have been assigned to mono- and bi-dentate co-ordination of the ethylxanthate ion to the surface. Surface complexes are most probably enthalpy stabilized, and the bond(s) between the metal ion site in the surface and the ligand must contain some degree of covalency, as the entropy contribution to the formation of a chemisorbed complex on a surface is small. The stability of complexes of this kind is expected to increase with increasing softness of metal site and ligand. This is indicated as the ethylxanthate and EDTA surface complexes on cadmium(II) sulphide seem to be more stable than the corresponding complexes on zinc(II) sulphide surfaces. The stability of the surface complex is dependent on the solvent used, and seems to be a function of the solvation properties of the solvent. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of the Chemical Society, Faraday Transactions
volume
87
pages
2769 - 2777
publisher
Royal Society of Chemistry
external identifiers
  • scopus:0009347423
ISSN
0956-5000
DOI
10.1039/FT9918702769
language
English
LU publication?
no
id
c6ac0226-c720-4ca2-a650-98c6ced67e65 (old id 4332734)
date added to LUP
2014-03-04 09:48:32
date last changed
2017-01-01 06:58:29
@article{c6ac0226-c720-4ca2-a650-98c6ced67e65,
  abstract     = {The crystal structures of zinc(II) and cadmium(II) sulphides are not affected by the stoichiometry of metal and sulphide ions at the precipitation of the two compounds. The composition and structure of the ultimate surface layers, and thereby the chemical properties of the particles, are on the other hand sensitive to the stoichiometry at the preparation. Chemisorbed ethylxanthate complexes are formed at metal ion sites on the surfaces of sphalerite and synthetic zinc(II) and cadmium(II) sulphides at metal and ethylxanthate ion concentrations where the solubility product of zinc(II) or cadmium(II) ethylxanthate is not exceeded. Two different types of ethylxanthate species co-ordinated to the surfaces have been found. These have been assigned to mono- and bi-dentate co-ordination of the ethylxanthate ion to the surface. Surface complexes are most probably enthalpy stabilized, and the bond(s) between the metal ion site in the surface and the ligand must contain some degree of covalency, as the entropy contribution to the formation of a chemisorbed complex on a surface is small. The stability of complexes of this kind is expected to increase with increasing softness of metal site and ligand. This is indicated as the ethylxanthate and EDTA surface complexes on cadmium(II) sulphide seem to be more stable than the corresponding complexes on zinc(II) sulphide surfaces. The stability of the surface complex is dependent on the solvent used, and seems to be a function of the solvation properties of the solvent.},
  author       = {Persson, Per and Malmensten, B. and Persson, I.},
  issn         = {0956-5000},
  language     = {eng},
  pages        = {2769--2777},
  publisher    = {Royal Society of Chemistry},
  series       = {Journal of the Chemical Society, Faraday Transactions},
  title        = {Interactions between Sulfide Minerals and Alkylxanthate Ions .1. A Vibrational Spectroscopic Study of the Interactions between Sphalerite and Synthetic Zinc(Ii) and Cadmium(Ii) Sulfides, and Ethylxanthate Ions in Aqueous and Acetone Solutions},
  url          = {http://dx.doi.org/10.1039/FT9918702769},
  volume       = {87},
  year         = {1991},
}