22537-50-4Relevant articles and documents
Photostimulated oxidation of Sn(II) in aqueous solutions: Spectral sensitivity and quantum yield
Reva,Vorob'eva
, p. 1399 - 1405 (2002)
The spectral sensitivity of Sn(II) complexes in acid and alkaline solutions of SnCl2 in photostimulated oxidation with oxygen was studied. The reaction mechanism was revealed. A spectrophotometric method for prompt monitoring of the composition of SnCl2 solutions was proposed.
Photochemical Generation of Sn(III) in Hydrochloric Acid Solutions
Shinohara, Nobuyoshi,Inoue, Makoto
, p. 730 - 733 (1989)
In the flash photolysis of Sn(II) in a deaerated hydrochloric acid solution, Sn(III) was produced.Sn(III) has an absorption maximum at 280 nm in a 1 mol dm-3 hydrochloric acid solution.In the flash photolysis of a deaerated Sn(IV) solution, intermediates of Sn(III) and Cl2- were produced.Transient absorption spectra of intermediates generated by the flashed Sn(IV) solutions were measured under various concentrations of dissolved oxygen.Since Sn(III) reacts with oxygen very rapidly, only Cl2- was confirmed in the oxygen-saturated Sn(IV) solution.In the flash photolysis of Sn(IV) solutions containing Sn(II), the yield of Sn(III) increased with an increase of the added Sn(II), due to the generation of Sn(III) by the reaction of Cl2- with Sn(II).It was found that only Sn(III) was produced in the irradiation of 5.0*10-4 mol dm-3 Sn(IV) solution containing Sn(II) at concentrations of more than ca. 7*10-5 mol dm-3.The reaction rate constant for the reaction of Sn(II) with Cl2- was estimated to be 8.9*108 mol-1 dm3 s-1.The mechanisms for the photochemical generation of Sn(III) are discussed.
Reactions of octacyanomolybdate(V) and octacyanotungstate(V) with s 2 metal-ion reducing centers
Yang, Zhiyong,Gould, Edwin S.
, p. 1858 - 1861 (2007/10/03)
The s2 centers, Sn(II), Ge(II), and In(I) reduce Mo v(CN)83- and Wv(CN)8 3- quantitatively to the corresponding octacyanomolybdate(IV) and -tungstate(IV) anions. Reductions by In(I) proceed 103-10 5 times as rapidly as those by Sn(II) and Ge(II). All reactions are triggered by a single electron oxidation, yielding a much more reactive s I intermediate. Reductions by Sn(II) in chloride medium proceed predominantly through the SnCl3- anion. The Ge(II)-W(CN) 83- reaction is initiated by a slow unimolecular heterolysis of the Ge(II) center, yielding very nearly linear profiles when the reductant is in excess. The Royal Society of Chemistry 2004.
Oxidation of Sn(II) in Halide Solutions: The Effect of Copper Ions
Zhelis,Rozovskii,Shlegerene
, p. 44 - 47 (2008/10/08)
The effect of copper compounds on the oxidation of Sn(H) is studied in chloride and bromide acid solutions. Copper ions exhibit catalytic properties in the chloride solutions and both the catalytic and inhibiting properties in the bromide solutions. The predominance of either effect depends on the stirring rate and the concentrations of the copper compounds or the ligands (halide ions). The catalytic activity of copper ions can be explained by a scheme, according to which the Cu(II) ions oxidize Sn(II) and, in turn, the resulting compounds of Cu(I) are oxidized by atmospheric oxygen (the rate-determining stage). The inhibiting action is apparently attributed to the chain termination as a result of the reaction between Cu(I) and free radicals.
Oxidation of Tin(II) in Sulfuric Acid Solutions: Effect of Copper Ions
Rozovskii,Gal'dikene,Zhelis,Motskus
, p. 48 - 51 (2008/10/08)
Copper ions increase the rate of oxidation of tin(II) with atmospheric oxygen in continuously stirred sulfuric acid solutions of compositions corresponding to bronzing electrolytes. For tin(II), this reaction is of the zero order. The reaction order in copper ions decreases with an increase in the concentration of copper ions, approaching zero. The reaction rate decreases with an increase in the concentration of sulfate ions and a decrease in acidity. The dependence of the reaction rate on the concentration of copper and sulfate ions is explained by the possible formation of catalytically inactive binuclear copper(II) sulfate complexes. The inhibiting effect of hydroquinone, quinone, and cobalt(III) ions, characteristic of chain reactions, is established. The effect of each of these inhibitors on the reaction kinetics is shown.
Catalytic activity of copper ions in the oxidation of tin(II) by oxygen
Zhelis,Shlegerene
, p. 644 - 647 (2008/10/08)
It is established that copper ions catalyze the oxidation of Sn(II). It is shown that the catalytic oxidation of Sn(II) is a complex process, the rate of which is determined by oxidation of Cu(I) by atmospheric oxygen. A mechanism for the kinetic cycle of the catalytic process is presented.
99Tc-thiocyanate complexes: their extractions as ionic associations with Adogen 464
March, J. G.,Grases, F.
, p. 2583 - 2586 (2007/10/02)
The extraction of the ionic species formed between two reduced Tc-SCN anionic complexes and trioctylmethyl ammonium cation has been studied spectrophotometrically in both oxygenated and deoxygenated media.The distribution ratio for each reduced complex has been determined as a function of tin(II) and Adogen 464 concentrations.The results indicate that, depending on the concentration of the Sn(II) reducing agent, a red Tc(IV) or a yellow Tc(III) complex can be formed.
