14265-45-3Relevant articles and documents
Catalytic activity of CuS nanoparticles in hydrosulfide ions air oxidation
Raevskaya,Stroyuk,Kuchmii,Kryukov
, p. 259 - 265 (2004)
The most efficient technique for H2S removal from the wastewaters is the catalytic aeration of the wastewaters, i.e., H2S oxidation in air-saturated solutions in the presence of catalysts. Photophysical characteristics of colloidal CuS nanoparticles synthesized in various conditions and stabilized in aqueous solutions with sodium polyphosphate were studied. Hydrosulfide ions air oxidation in aqueous solutions at room temperatures and 1 atm proceeded with small rates in the absence of catalysis and increased, substantially upon the injection of CuS nanoparticles into a reacting mixture. The rate of HS- catalytic oxidation grew at an increase in molar CuS concentration, initial concentration of Na2S, volume fraction of oxygen in gas mixture bubbled into the reactor, and pH of a solution (≤ 11.9). A scheme for the mechanism of HS- catalytic oxidation was proposed. According to the scheme, HS- oxidation is a chain radical reaction initiated on the surface of CuS nanoparticles and propagated further in the bulk of a solution.
Bartlett, P. D.,Davis, R. E.
, p. 2513 - 2516 (1958)
DNA damage induced by sulfite autoxidation catalyzed by copper(II) tetraglycine complexes
Moreno, Ruben G. M.,Alipazaga, Maria V.,Medeiros, Marisa H. G.,Coichev, Nina
, p. 1101 - 1107 (2005)
Copper(II)/(III) tetraglycine complexes were investigated for their ability to catalyze the autoxidation of sulfite resulting in oxidative DNA damage. The focus of this work is on DNA damage by Cu(III) and oxysulfur radicals formed by the oxidation of S(IV) oxides by dissolved oxygen in the presence of Cu(II) tetraglycine complexes. The results suggest that sulfite is rapidly oxidized by oxygen in the presence of Cu(II) complexes producing Cu(III) tetraglycine, which can be monitored spectrophotometrically at 365 nm. A synergistic effect of Cu(II) with a second metal ion (Ni(II), Co(II) or Mn(II) traces) was observed. The Royal Society of Chemistry 2005.
The preparation and properties of N-fluoroformyliminosulfur difluoride, SF2=NCOF
Clifford, Alan F.,Kobayashi, Calvin S.
, p. 571 - 574 (1965)
The inorganic isocyanates derived from silicon, phosphorus, and sulfur have been found to react readily with sulfur tetrafluoride to give, in common, the novel compound, N-fluoroformyliminosulfur difluoride, SF2=NCOF, the preparation and proper
Evidence for Multistep Reactions in the Iron(III) Catalysed Autoxidation of Sulphur(IV) Oxides: Possible Steps during Acid Rain Formation
Kraft, Jochen,Eldik, Rudi van
, p. 790 - 792 (1989)
Kinetic and spectroscopic evidence is presented for the formation and decomposition of iron(III)-sulphur(IV) transients during the iron(III) catalysed autoxidation of sulphur(IV) oxides in aqueous solution, for which four different reaction steps could be
Oxidation of thiocyanate with H2O2 catalyzed by [RuIII(edta)(H2O)]-
Chatterjee, Debabrata,Paul, Barnali,Mukherjee, Rupa
, p. 10056 - 10060 (2013)
The [RuIII(edta)(H2O)]- (edta4- = ethylenediaminetetraacetate) complex is shown to catalyze the oxidation of thiocyanate (SCN-) with H2O2 mimicking the action of peroxidases. The kinetics of the catalytic oxidation process was studied by using stopped-flow and rapid scan spectrophotometry as a function of [RuIII(edta)], [H2O2], [SCN-], pH (3.2-9.1) and temperature (15-30 °C). Spectral analyses and kinetic data are suggestive of a catalytic pathway in which hydrogen peroxide reacts directly with thiocyanate coordinated to the RuIII(edta) complex. Catalytic intermediates such as [RuIII(edta)(OOH)]2- and [Ru V(edta)(O)]- were found to be non-reactive in the oxidation process under the specified conditions. Formation of SO 42- and OCN- was identified as oxidation products in ESI-MS experiments. A detailed mechanism in agreement with the spectral and kinetic data is presented. The Royal Society of Chemistry 2013.
Lewes, V.
, p. 300 (1882)
Some perfluoroalkyliminosulfur derivatives
Lustig, Max
, p. 1317 - 1319 (1966)
Trifluoromethyliminosulfur dichloride and pentafluoroethyliminosulfur dichloride are prepared by reaction of aluminum trichloride with trifluoromethyliminosulfur difluoride and pentafluoroethyliminosulfur difluoride, respectively. These imino dichlorides
177. Photoreduction of Thiosulfate in Semiconductor Dispersions
Borgarello, Enrico,Desilvestro, Jean,Graetzel, Michael,Pelizzetti, Ezio
, p. 1827 - 1834 (1983)
Conduction band electrons produced by band gap excitation of TiO2-particles reduce efficiently thiosulfate to sulfide and sulfite. This reaction is confirmed by electrochemical investigations with polycrystalline TiO2-electrodes.The valence ban
Ishimoto, M.,Koyama, J.,Nagai, Y.
, p. 41 - 53 (1955)
Light-Activated generation of nitric oxide (NO) and sulfite anion radicals (SO3-) from a ruthenium(ii) nitrosylsulphito complex
Roveda, Antonio C.,Santos, Willy G.,Souza, Maykon L.,Adelson, Charles N.,Gon?alves, Felipe S.,Castellano, Eduardo E.,Garino, Claudio,Franco, Douglas W.,Cardoso, Daniel R.
supporting information, p. 10812 - 10823 (2019/07/31)
This manuscript describes the preparation of a new Ru(ii) nitrosylsulphito complex, trans-[Ru(NH3)4(isn)(N(O)SO3)]+ (complex 1), its spectroscopic and structural characterization, photochemistry, and thermal reactivity. Complex 1 was obtained by the reaction of sulfite ions (SO32-) with the nitrosyl complex trans-[Ru(NH3)4(isn)(NO)]3+ (complex 2) in aqueous solution resulting in the formation of the N-bonded nitrosylsulphito (N(O)SO3) ligand. To the best of our knowledge, only four nitrosylsulphito metal complexes have been described so far (J. Chem. Soc., Dalton Trans., 1983, 2465-2472), and there is no information about the photochemistry of such complexes. Complex 1 was characterized by spectroscopic means (UV-Vis, EPR, FT-IR, 1H-and 15N-NMR), elemental analysis and single-crystal X-ray diffraction. The X-ray structure of the precursor complex 2 is also discussed in the manuscript and is used as a reference for comparisons with the structure of 1. Complex 1 is water-soluble and kinetically stable at pH 7.4, with a first-order rate constant of 3.1 × 10-5 s-1 for isn labilization at 298 K (t1/2 ~ 373 min). Under acidic conditions (1.0 M trifluoroacetic acid), 1 is stoichiometrically converted into the precursor complex 2. The reaction of hydroxide ions (OH-) with 1 and with 2 yields the Ru(ii) nitro complex trans-[Ru(NH3)4(isn)(NO2)]+ with second-order rate constants of 2.1 and 10.5 M-1 s-1 (at 288 K), respectively, showing the nucleophilic attack of OH- at the nitrosyl in 2 (Ru-NO) and at the nitrosylsulphito in 1 (Ru-N(O)SO3). The pKa value of the-SO3 moiety of the N(O)SO3 ligand in 1 was determined to be 5.08 ± 0.06 (at 298 K). The unprecedented photochemistry of a nitrosylsulphito complex is investigated in detail with 1. The proposed mechanism is based on experimental (UV-Vis, EPR, NMR and Transient Absorption Laser Flash Photolysis) and theoretical data (DFT) and involves photorelease of the N(O)SO3- ligand followed by formation of nitric oxide (NO) and sulfite radicals (SO3-, sulfur trioxide anion radical).
Mechanism of decomposition of the human defense factor hypothiocyanite near physiological pH
Kalmar, Jozsef,Woldegiorgis, Kelemu L.,Biri, Bernadett,Ashby, Michael T.
, p. 19911 - 19921 (2012/01/31)
Relatively little is known about the reaction chemistry of the human defense factor hypothiocyanite (OSCN-) and its conjugate acid hypothiocyanous acid (HOSCN), in part because of their instability in aqueous solutions. Herein we report that HOSCN/OSCN- can engage in a cascade of pH- and concentration-dependent comproportionation, disproportionation, and hydrolysis reactions that control its stability in water. On the basis of reaction kinetic, spectroscopic, and chromatographic methods, a detailed mechanism is proposed for the decomposition of HOSCN/OSCN- in the range of pH 4-7 to eventually give simple inorganic anions including CN -, OCN-, SCN-, SO32-, and SO42-. Thiocyanogen ((SCN)2) is proposed to be a key intermediate in the hydrolysis; and the facile reaction of (SCN) 2 with OSCN- to give NCS(=O)SCN, a previously unknown reactive sulfur species, has been independently investigated. The mechanism of the aqueous decomposition of (SCN)2 around pH 4 is also reported. The resulting mechanistic models for the decomposition of HOSCN and (SCN) 2 address previous empirical observations, including the facts that the presence of SCN- and/or (SCN)2 decreases the stability of HOSCN/OSCN-, that radioisotopic labeling provided evidence that under physiological conditions decomposing OSCN- is not in equilibrium with (SCN)2 and SCN-, and that the hydrolysis of (SCN)2 near neutral pH does not produce OSCN-. Accordingly, we demonstrate that, during the human peroxidase-catalyzed oxidation of SCN-, (SCN)2 cannot be the precursor of the OSCN- that is produced.