Xi:Irritant;
7757-82-6Relevant articles and documents
Investigation of 3,3′,5,5′-tetra-tert-butyl-4,4′-stilbenequinone-based catalyst in the reaction of liquid-phase oxidation of inorganic sulfides
Hoang, Hien Y.,Akhmadullin, Renat Maratovich,Akhmadullina, Farida Yunusovna,Zakirov, Rustem Kayumovich,Bui, Dinh Nhi,Akhmadullina, Alfiia Garipova,Gazizov, Almir Sabirovich
, p. 130 - 139 (2018)
In this paper, the intermediate and final reaction products of catalytic oxidation of inorganic sulfides in the presence of oxygen dissolved in the kerosene fraction and 3,3′,5,5′-tetra-tert-butyl-4,4′-stilbenequinone were investigated. The thiosulfate and sulfate are major products of the oxidation of sodium sulfide under these conditions. The intermediate and final products in the catalytic oxidation of sulfide sulfur do not affect the rate of its oxidation. The yield of catalytic oxidation products depends on the nature of the sulfide and on the pH of the solution. The catalytic cycle for sulfide oxidation in the presence of 3,3′,5,5′-tetra-tert-butyl-4,4′-stilbenequinone is shown. The role of 3,3′,5,5′-tetra-tert-butyl-4,4′-stilbenequinone is to create a new and a more effective way of electron transfer from the reducing agent (sulfide) to the oxidant (oxygen).
STUDIES ON THE CONCENTRATED STEFFEN FLUID OF BEET SUGAR INDUSTRY - 1. ON THE SALT SEPARATED FROM CONCENTRATED STEFFEN FLUID USING METHANOL AND SULFURIC ACID.
Ito,Abe,Sasaki,Wakabayashi,Misono
, p. 3920 - 3922 (1982)
The chemical desalting technique was applied to the concentrated Steffen fluid using concd sulfuric acid and methanol. The chemical components of the isolated salt were studied by scanning electron microscopy, infrared spectroscopy, X-ray diffraction, and
Lewis acid base reactions between boron trifluoride and complex oxoanions as a versatile access to fluorooxoanions: Synthesis of sodium (Trifluoroborato)sulfate
Pilz, Thomas,Jansen, Martin
, p. 733 - 736 (2012)
Na2SO4BF3, synthesized in a closed vessel from BF3 and Na2SO4 at 603 K, crystallizes in the triclinic space group P1 (a = 6.6033(2), b = 6.6328(2), c = 6.6349 (1) A, α = 84.542(2), β = 84.458(1) and γ = 65.762(1)°). The novel fluorooxo anion [SO4BF3]2- displays a structure similar to the disulfate anion S2O7 2-. Heating the title compound in the absence of BF3 in the gas phase leads to decomposition even at 553 K, which is below the temperature of synthesis under BF3 pressure. Copyright
FeCl2-Na2SO3-H2O system as a basis for recovery of iron(II) sulfite from solution
Motov,Vasekha
, p. 1674 - 1677 (2009)
The FeCl2-Na2SO3-H2O system was studied along seven sections with the molar ratios Na2SO 3: FeCl2 = 5: 1, 5: 2, 5: 3, 5: 4, 5: 5, 5: 10, and 5: 15, including six points on each s
Evolved gas analyses on a mixed valence copper(I,II) complex salt with thiosulfate and ammonia by in situ TG-EGA-FTIR and TG/DTA-EGA-MS
Madarasz, Janos
, p. 111 - 116 (2009)
Thermal decomposition of a mixed valence copper salt, Na 4[Cu(NH3)4][Cu(S2O3) 2]2?0.5NH3 (1) prepared from pentahydrates of sodium thiosulfate and copper sulphate of v
Structural, transport, and electrochemical investigation of novel AMSO 4F (A = Na, Li; M = Fe, Co, Ni, Mn) metal fluorosulphates prepared using low temperature synthesis routes
Barpanda, Prabeer,Chotard, Jean-Nol,Recham, Nadir,Delacourt, Charles,Ati, Mohamed,Dupont, Loic,Armand, Michel,Tarascon, Jean-Marie
, p. 7401 - 7413 (2010)
We have recently reported a promising 3.6 V metal fluorosulphate (LiFeSO4F) electrode, capable of high capacity, rate capability, and cycling stability. In the current work, we extend the fluorosulphate chemistry from lithium to sodium-based systems. In this venture, we have reported the synthesis and crystal structure of NaMSO4F candidates for the first time. As opposed to the triclinic-based LiMSO4F phases, the NaMSO4F phases adopt a monoclinic structure. We further report the degree and possibility of forming Na(Fe1-xMx)SO 4F and (Na1-xLix)MSO4F (M = Fe, Co, Ni) solid-solution phases for the first time. Relying on the underlying topochemical reaction, we have successfully synthesized the NaMSO4F, Na(Fe1-xMx)SO4F, and (Na1-xLi x)MSO4F products at a low temperature of 300 °C using both ionothermal and solid-state syntheses. The crystal structure, thermal stability, ionic conductivity, and reactivity of these new phases toward Li and Na have been investigated. Among them, NaFeSO4F is the only one to present some redox activity (Fe2+/Fe3+) toward Li at 3.6 V. Additionally, this phase shows a pressed-pellet ionic conductivity of 10 -7 S·cm-1. These findings further illustrate the richness of the fluorosulphate crystal chemistry, which has just been recently unveiled.
Studies on synthetic galloalunites AGa3(SO4) 2(OH)6: Synthesis, thermal analysis, and X-ray characterization
Rudolph, Wolfram W.,Schmidt, Peer
, p. 112 - 120 (2011)
Stoichiometric end member galloalunites of the general formula AGa 3(SO4)2(OH)6, with A = Na +, K+, Rb+, H3O+, and NH4+ have been synthesized under hydrothermal conditions. These galloalunites were characterized by chemical methods, thermal analysis (DSC, TG coupled with mass spectroscopy), and powder X-ray diffraction (XRD). The stages of thermal decomposition of sodium, potassium and rubidium galloalunite show a common decomposition mechanism forming β-Ga 2O3 and A2SO4 (A = Na+, K+, and Rb+) while ammonium and oxonium galloalunite decompose under formation of pure β-Ga2O3. The thermogravimetric results confirmed the analytical results on the galloalunites and thereby verified the stoichiometry of these synthetic products. Galloalunites with different monovalent cations in A site (i.e. Na+, K+, Rb+, H3O+ and NH 4+) crystallize in the rhombohedral space group R3m (#166). The effects of substitution on the unit cell parameters are rationalized in terms of the structural arrangements in galloalunites. The unit cell parameter c increases with increasing effective ionic radii of the cation in the A site, whereas the parameter a changes to a much lesser degree.
Spectral, thermal, and photochemical studies on certain first, second, and third generation cephalosporin antibiotics and their Cd(II) complexes
Osman, Ahmed H.,El-Maali, Nagwa Abo,Aly, Aref A. M.,Al-Hazmi, Gamil A. A.
, p. 763 - 781 (2002)
The reactions of six cephalosporin antibiotics with cadmium chloride afforded the corresponding Cd(II) complexes. The antibiotics are: cephalexin, cephapirin, cefamandole, cefuroxime, cefotaxime, and ceftazidime. Their Cd(II) complexes are of the general formulas Cd(ATB)Cl·xH2O, Cd(ATB)2·xH2O and Cd2(ATB)Cl2·xH2O where ATB = the respective antibiotic, x= 1-3. The complexes have been characterized on the basis of elemental analyses, IR, electronic and 1H NMR spectroscopy, thermal decomposition and photochemical behaviour. Thermogravimetry and derivative thermogravimetry (TG-DTG) have been used to study the stabilities and the thermal decomposition processes of the antibiotics and their Cd(II) complexes. In some cases, the decomposition steps could be correlated with the proper decomposition products, where possible activation energies and order of the decomposition reaction have been calculated from the thermal data. The photochemical behaviour of the antibiotics under investigation and their Cd(II) complexes have been studied. Cephalexin and cefamandole show similar behaviour upon irradiation with light of 298 nm, i.e., an appearance of a new band at long wavelength attributable to the formation of a photocyclization product. The Cd(II) complex of cephalexin exhibits high light sensitivity. Mechanisms of the photolysis of the free antibiotics and Cd-complexes are suggested.
Thermal characteristics of novel NaH2PO4/NaHSO 4 flame retardant system for polyurethane foams
Kulesza,Pielichowski,Kowalski
, p. 475 - 478 (2006)
Thermal behaviour of NaH2PO4/NaHSO4 flame retardant system for polyurethane (PU) rigid foams was investigated by simultaneous TG/DTA under dynamic conditions. It has been found that the most probable mode of action of 5:3
Study of thermal preparation of iron (III) pigments by means of thermal analysis methods
Solc,Trojan,Brandova,Kuchler
, p. 463 - 469 (1988)
The decomposition of hydronium jarosite occurs in two temperature ranges: first a loss of 8 moles of H2O from 2 moles of jarosite, and then in the second step one mole of H2O and 4 moles of SO3 are simultaneously evolved. Fe(OH)(SO4)2 are assumed to be intermediates. During the thermal treatment of Na or K jarosites, only Fe2(SO4)3 appears as intermediate. The decomposition temperatures are significantly influenced by the type of crucible used (determination of partial pressure of gaseous decomposition products). The particle size distribution of the starting jarosite has no effect upon the temperaure of the decomposition steps and the reaction with ZnO. The results of TG measurements were evaluated via calculations of the steps of the experimental activation energies for these partial decomposition jarosites and for their reaction with ZnO.
