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A comparative study of the structure of copper and lead xanthates

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Abstract

XPS, PbL3 and CuK EXAFS, solid state NMR, and EPR techniques are used to study insoluble products formed in the interaction of aqueous solutions of lead(II) nitrate and copper (II) sulfate with potassium nbutylxanthate (KX). The XPS spectra of lead xanthates with the composition PbX2 are similar to those of KX, and interatomic distances of 0.279 nm suggest a nearly ionic character of Pb–S bonds. In copper xanthate precipitating together with dixanthogen (approximately 15 wt.%), the Cu(I)–S bond length is smaller (0.229 nm), and copper coordination number of 2.9 in a composite with dixanthogen increases to 3.3 after its removal by washing with acetone. The XPS spectra indicate the covalent character of the bond and non-equivalence of xanthate radicals. Solid state 1H and 13C NMR spectra as well as the actual absence of metal lines under the measurement conditions demonstrate strong disordering of the structure of xanthates, which is stronger for PbX2 and weakest in CuX after the removal of dixanthogen. EPR reveals sulfur-containing radicals and Cu2+ in CuX, however, their amounts are insignificant and decrease after the washing with acetone. The results of the work are significant for the understanding of the reactivity of xanthates, in particular, under the conditions of flotation of base metal ores.

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Authors and Affiliations

  1. Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia

    S. A. Vorobyev, N. G. Maksimov & Yu. L. Mikhlin

  2. Siberian Federal University, Krasnoyarsk, Russia

    S. V. Saikova

  3. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia

    S. B. Erenburg & S. V. Trubina

  4. Kirensky Insitute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia

    Yu. N. Ivanov

Authors
  1. S. A. Vorobyev
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  2. S. V. Saikova
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  3. S. B. Erenburg
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  4. S. V. Trubina
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  5. Yu. N. Ivanov
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  6. N. G. Maksimov
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  7. Yu. L. Mikhlin
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Correspondence to S. A. Vorobyev.

Additional information

Translated from Zhurnal Strukturnoi Khimii, Vol. 58, No. 6, pp. 1191–1198, July–August, 2017.

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Vorobyev, S.A., Saikova, S.V., Erenburg, S.B. et al. A comparative study of the structure of copper and lead xanthates. J Struct Chem 58, 1144–1151 (2017). https://doi.org/10.1134/S0022476617060117

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  • DOI: https://doi.org/10.1134/S0022476617060117

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