5395-75-5Relevant academic research and scientific papers
Synthesis and characterization of TiO2/Mg(OH)2composites for catalytic degradation of CWA surrogates
?tastny, Martin,?tengl, Václav,Ederer, Jakub,Henych, Jirí,Issa, Gloria,Jano?, Pavel,Kormunda, Martin,Tolasz, Jakub
, p. 19542 - 19552 (2020/06/04)
Surface catalyzed reactions can be a convenient way to deactivate toxic chemical warfare agents (CWAs) and remove them from the contaminated environment. In this study, pure titanium oxide, magnesium hydroxide, and their composites TiO2/Mg(OH2) were prepared by thermal decomposition and precipitation of the titanium peroxo-complex and/or magnesium nitrate in an aqueous solution. The as-prepared composites were examined by XRD, XPS, HRTEM, and nitrogen physisorption. Their decontamination ability was tested on CWA surrogates and determined by high-performance liquid chromatography (HPLC) and gas chromatography coupled with mass spectrometry (GC-MS). Dimethyl methyl phosphonate (DMMP) was used as a G simulant for the nerve agents sarin (GB) and soman (GD) while 2-chloroethyl ethyl sulfide (2-CEES) and 2-chloroethyl phenyl sulfide (2-CEPS) were used as surrogates of sulfur mustard (HD). The activity of the as-prepared composites was correlated with acid-base properties determined by potentiometric titrations and pyridine adsorption studied byin situDRIFTS. The mixing of Ti and Mg led to an increase of the surface area and the amount of surface -OH groups (with an increasing amount of Ti) that caused improved degradation of DMMP.
Alkyldisulfanium salts: Isolable, electrophilic sulfur reagents competent for polyene cyclizations
Schevenels, Florian T.,Shen, Minxing,Snyder, Scott A.
supporting information, p. 2 - 5 (2017/11/27)
Tools that can effect electrophilic sulfur-promoted cation-π cyclizations are generally lacking, especially using alkylsulfide-based reagents. Herein we report that combining three different 1,2-dithioethers with Cl2 and SbCl5 generates isolable alkyldisulfanium salts that can effect such reactions. These new reagents can install -SMe, -SEt, and -SCH2CH2CF3 in modest, moderate, or good yield on diverse frameworks, including polyenes that terminate with electron-deficient groups. We also show that reagents such as dimethyl(methylthio)sulfonium tetrafluoroborate (DMTSF) can accomplish similar chemistry.
Heterogeneous photocatalytic degradation of disulfoton in aqueous TiO 2 suspensions: Parameter and reaction pathway investigations
Chen, Ming-Hung,Chen, Chiing-Chang,Wu, Ren-Jang,Lu, Chung-Shin
, p. 380 - 390 (2013/07/27)
The photocatalytic degradation of organophosphorus insecticide disulfoton is investigated by having titanium dioxide (TiO2) as a photocatalyst. About 99% of disulfoton is degraded after UV irradiation for 90 min. The effects of the solution pH, catalyst dosage, light intensity, and inorganic ions on the photocatalytic degradation of disulfoton are also investigated, as well as the reaction intermediates which are formed during the treatment. Eight intermediates have been identified and characterized through a mass spectra analysis, giving insight into the early steps of the degradation process. To the best of our knowledge, this is the first study reporting the degradation pathways of disulfoton. The results suggest that possible transformation pathways may involve in either direct electron or hole transfer to the organic substrate. The photodegradation of disulfoton by UV/TiO2 exhibits pseudo-first-order reaction kinetics and a reaction quantum yield of 0.267. The electrical energy consumption per order of magnitude for photocatalytic degradation of disulfoton is 85 kWh/(m3 order).
Novel dithioether-silver(I) coordination architectures: Structural diversities by varying the spacers and terminal groups of ligands
Li, Jian-Rong,Ba, Xian-He,Jiao, Jiao,Du, Wen-Ping,Xu, Xiu-Hua,Zhang, Ruo-Hua
, p. 464 - 474 (2007/10/03)
An investigation into the dependence of the framework formation of coordination architectures on ligand spacers and terminal groups was reported based on the self-assembly of AgClO4 and eight structurally related flexible dithioether ligands, RS(CH2)nSR (L an, R = ethyl group, Lbn, R = benzyl group, n = 1-4). Eight novel metal-organic architectures, [Ag(L a1)3/2ClO4]n (1a), [Ag2(La2)2(ClO4) 2]2 (2a), [AgLa3ClO 4]n (3a), {[Ag(La4) 2]ClO4}n (4a), [AgLb 1ClO4]2 (1b), [Ag(Lb 2)2]ClO4 (2b), {[Ag(Lb 3)3/2(ClO4)1/2](ClO 4)1/2}n(3b) and [Ag(Lb 4)3/2ClO4]n (4b), were synthesized and structurally characterized by X-ray crystallography. Structure diversities were observed for these complexes: 1a forms a 2-D (6,3) net, while 2a is a discrete tetranuclear complex, in which the Ag1 ion adopts linear and tetrahedral coordination modes, and the S donors in each ligand show monodentate terminal and μ2-S bridging coordination fashions; 3a has a chiral helical chain structure in which two homo-chiral right-handed single helical chains (Ag-La3-)n are bound together through μ2-S donors, and simultaneously gives rise to left-handed helical entity (Ag-S-)n. In 4a, left- and right-handed helical chains formed by the ligands bridging Ag1 centers are further linked alternately by single-bridging ligands to form a non-chiral 2-D framework. 1b has a dinuclear structure showing obvious ligand-sustained Ag Ag interaction, while 2b is a mononuclear complex; 3b is a 3-D framework formed by ClO4- linking the 2-D (6,3) framework, which is similar to that of 1a, and 4b has a single, double-bridging chain structure in which 14-membered dinuclear ring units formed through two ligands bridging two Ag 1 ions are further linked by single-bridging ligands. In addition, a systematic structural comparison of these complexes and other reported AgClO4, complexes of analogous dithioether ligands indicates that the ligand spacers and terminal groups take essential roles on the framework formation of the Ag1 complexes, and this present feasible ways for adjusting the structures of such complexes by modifying the ligand spacers and terminal groups.
Reactions of diorganyl disulfides with dihaloalkanes in basic reductive media. Synthesis of bis(organylthio)alkanes
Alekminskaya,Russavskaya,Korchevin,Deryagina
, p. 75 - 78 (2007/10/03)
A convenient preparative synthesis of bis(organylthio)alkanes was developed. It is based on alkylation with dihaloalkanes of solutions of diorganyl disulfides in the basic reductive system hydrazine hydrate-alkali. The generation of organylthiolate anions
New preparative procedure for the synthesis of chloroalkyl sulfides
Russavskaya,Korchevin,Alekminskaya,Sukhomazova,Levanova,Deryagina
, p. 1445 - 1448 (2007/10/03)
Reaction of thiols with dihaloalkanes in the system hydrazine hydrate-base leads to alkyl(chloroalkyl) sulfides with different positions of the chlorine atom with respect to sulfur. The developed one-step procedure for the synthesis of such unsymmetrical sulfides is most suitable for arenethiols and alkanethiols having a long polymethylene chain. The reaction mechanism is discussed.
THE CHARACTERIZATION OF SULFONIUM CHLORIDES BY GAS CHROMATOGRAPHY/MASS SPCTROMETRY AND THE DEGRADATION OF 2-CHLOROETHYL SULFIDE DERIVATIVES
Rourhbaugh, Dennis K.,Yang, Yu-Chu,Ward, J. Richard
, p. 17 - 26 (2007/10/02)
Three aqueous samples containing sulfonium chloride salts of both mustard gas (2,2'-dichlorodiethylsulfide) and its simulant 2-chloroethyl ethyl sulfide have been characterized by gas chromatography/mass spectrometry (GC/MS).Theese salts decompose thermallly to the sorresponding 2-chloroethyl and 2-hydroxyethyl sulfides, therefore GC/MS analysis is not indicative of the true composition of these solutions.Small amounts of dithioethers characteristic of the decomposition of the dimeric salts were also detected.Electron Impact (EI) ionization produces a more intense molecular ion than methane chemical ionization (CI) for the dithioethers because of the ease of formation of sulfonium ions during chemical ionization.The composition products of four aged samples of 2-chloroethyl sulfides (RSCH2CH2Cl where R=methyl, ethyl, phenyl and benzyl groups) were also characterized by GC/MS, which indicated that decomposition of these compounds may proceed via dimeric sulfonium ions.Mustard gas was detected in all but one of the samples, providing evidence for secondary sulfonium cation formation in the degradation prcess.Keywords: Sulfonium chlorides; 2-chloroethyl sulfides; degradation; dimeric sulfonium cations; GC/MS characterization.
Zur Koordination Mehrfunktioneller Thioether in Cyclopentadienyleisen-Komplexen
Kuhn, Norbert,Schumann, Hans
, p. 93 - 104 (2007/10/02)
+ reacts with the ligands L-L and L-L-L to give the cations + (L-L= RS(CH2)nSR, 1,4-dithiane) and + (L-L-L= 1,3,5-trithiane, tris(methylmercapto)methane) containing monodentate coordinated sulfur ligands.In a similar way, sulfur ligand bridged dinuclear dications 2+ and 2+ and trinuclear trications 3+ are formed.Irradiation of the mononuclear cations gives the chelate complexes 2-L-L)>+.
HIGH-TEMPERATURE ORGANIC SYNTHESIS. XXVI. REACTIONS OF ALKANETHIOLS AND DIALKYL SULFIDES AND DISULFIDES WITH VINYL CHLORIDE
Kuznetsova, M. A.,Deryagina, E. N.,Voronkov, M. G.
, p. 2130 - 2132 (2007/10/02)
An abnormal directions was established in the thermal reactions of alkanethiols and dialkyl sulfides and disulfides with vinyl chloride, leading to the formation of the corresponding 1,1-bis(alkylthio)ethanes.
