55671-63-1Relevant academic research and scientific papers
Interactions between Sulphide Minerals and Alkylxanthate Ions Part 4.-Vibrational Spectroscopic and Calorimetric Study of the Interactions between Galena and Synthetic Lead(II) Sulphide, and Alkylxanthate Ions in Aqueous, Acetone and Acetonitrile Solutions
Persson, Per,Persson, Ingmar
, p. 2779 - 2784 (1991)
The reactions between galena and synthetic lead(II) sulphide powders, and potassium alkylxanthates have been studied in aqueous, acetone and acetonitrile solutions.Acetone and acetonitrile have been used since potassium and lead(II) alkylxanthates are soluble in these solvents.Qualitative analysis of the alkylxanthate species present on the surfaces of galena and lead(II) sulphide after treatment with alkylxanthate ions has been made by means of diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy.Solid lead(II) alkylxanthate is formed on oxidized galena and lead(II) sulphide surfaces.Alkylxanthate ions are co-ordinated to lead sites in the ultimate surface layer as alkylxanthate complexes on synthetic lead(II) sulphide surfaces when soluble lead(II) compounds are removed.Two types of complex adsorbed onto galena and lead(II) sulphide surfaces have been found.One of these complexes resembles similar complexes on zinc(II) and cadmium(II) sulphide surfaces.This chemisorbed complex is formed in all solvents studied.The other kind of complex is formed only in acetone and acetonitrile solutions.It displays a unique vibrational spectrum and it is formed in a non-exothermic reaction.This complex may result from an electrostatic interaction between a charged particle and alkylxanthate ions.
Infrared spectroscopic determination of the gas-phase thermal decomposition products of metal-ethyldithiocarbonate complexes
Vreugdenhil, Andrew J.,Brienne, Stephane H.R.,Butler, Ian S.,Finch, James A.,Markwell, Ross D.
, p. 2139 - 2151 (2007/10/03)
Head-space analysis by gas-phase infrared spectroscopy (HAGIS) allows the facile examination of the decomposition mechanisms of the metal xanthates [metal-(O-alkyldithiocarbonates], Fe(EtOCS2)3, Zn(EtOCS2)3, Cu(EtOCS2), Pb(EtOCS2)2 and Ni(EtOCS2)2, over the temperature range 25-120°C. These metal xanthates fall into two groups based on the generation of the primary gaseous decomposition products, CS2, COS and CO2. The first group, consisting of Fe(III) and Zn(II) xanthates, decompose readily, forming mostly CS2 and COS in a constant ratio and leaving, initially, a metal-alkoxide residue. In the second group, decomposition is relatively small, generating CO2 and COS, with the proportion of COS increasing as the temperature increases and CS2 formation occurring only at the upper end of the temperature range. The residue is more of a metal-thioalkyl species in this case. Presumably, CO2 is formed by re-insertion of COS into a metal alkoxide and elimination of CO2, leaving a thioalkyl moiety. Volatile metal-xanthates are probably observed in the gas-phase, allowing examination of the changes concomitant to the vaporization of the discrete metal xanthates from network or partially associated solids.
