Antimonate, determination

Antimonate, hexafluoro-, 3, 276 Antimonate, tris(cthyl dithioearbonate)-electron pair, 1, 37 Antimonates, 3, 265 Antimonic acids, 3, 265 Antimony, 3, 237-294 biology, 3,277 carcinogenicity, 3, 278 coordination number, 3, 256 determination... 

Oi T, Odagiri T, Nomura M (1997) Extraction of lithium from GSJ rock reference samples and determination of their lithium isotopic compositions. Anal Chim Acta 340 221-225 Oi T, Shimizu K, Tayama S, Matsuno Y, Hosoe M (1999) Cubic antimonic acid as column-packing material for chromatographic lithium isotope separation. Sep Sci Tech 34 805-816 Olsher U, Izatt RM, Bradshaw JS, Dailey NK (1991) Coordination chemistry of lithium ion a crystal and molecular structure review. Chem Rev 91 137-164... 

The Mdssbauer spectrometer was equipped with a 10 mC 5 Co/Rh source maintained at room temperature, A Northern NS-yOO multichannel analyser was used for taking the spectra. The Mdssbauer parameters were determined by least square computer programme. Tht isomer shift (5) was calculated with reference to a-Fe. The diaracieristics of iron in various iron molybdates and iron antimonate arc given in table I. 

Wet Methods.—(a) Gravimetric.— a) Determination as Tri-sulphide, SB. Sj.— H,S is passed for twenty minutes into the cold solution of an antimonite or antimonate. The solution is then heated to... 

As an example, when the photoacid generator triphenylsulfonium hexafluoro-antimonate is exposed to radiation, it decomposes to release the superacid hexafluoroantimonic acid in the resist film. While this photochemical reaction can occur at room temperature, the acid-catalyzed deprotection of the pendant t-butyl group of the resist polymer occurs at reasonable rates only at elevated temperature. It is therefore necessary to heat the resist film to an appropriate temperature (PEB) to provide the energy that is required for the acid-catalyzed deprotection of the t-butyl group of the ester, which in mrn affords the base-soluble norbomene carboxylic acid unit the isobutylene volatilizes. The extent of deprotection at constant temperamre is dependent on the dose of applied radiation. By monitoring the carboxylic acid OH stretch 3000-3600 cm and the ester carbonyl (C O) around 1735 cm acid carbonyl (C O) around 1705 cm , and ester (C-O-C) stretch around 1150 cm it is possible to determine by means of IR spectroscopy the extent of dose-dependent deprotection, as well as the influence of baking temperature on the extent of deprotection for each resist system. Doses ranging from 0 to 50 mJ/cm were applied to each resist system, after which they were baked at 120, 130, 140, and 150°C for 60 seconds and analyzed by FTIR. ... 

In an effort to probe the nature of the initial interaction between propane and the surface of the gallium antimonate-based catalyst, the rates of propane and isobutane ammoxidation were compared (134). In all instances, the propane conversion was greater than the conversion of isobutane vmder the same reaction conditions. Likewise, the rate of acrylonitrile formation from propane was greater than the rate of methaciylonitrile formation from isobutane. Assuming that the rate-determining step is abstraction of hydrogen from the hydrocarbon, the data suggest that abstraction does not occur at a secondary or tertiary carbon, but rather at a primary carbon site and that the first... 

The zwitterionic tetramethylene intermediate has been trapped with methanol as a linear 1-methoxybutane, indicating that the addition of tetracyanoethylene to NVK occurs in a stepwise manner. Once the zwitterions are formed, the course of the reaction is determined largely by experimental conditions. With excess NVK, cationic polymerization occurs. If the concentrations of NVK and tetracyanoethylene are comparable, collapse of the intermediate to the corresponding cyclobutane is favored. The cyclobutane formation is reversible, and the isolated cyclobutane alone is capable of initiating the cationic polymerization of NVK. The polymerization of NVK by the stable radical cation salts phenothiazin hexafluoroantimonate [464] and tris-p-bromophenylamminium hexachloro-antimonate [465] were shown to occur via charge transfer initiation too. 

Stationary phase Binder free Zirconium (IV) antimonate ion exchanger in H form, mixture of zirconium antimonate and silica gel (1 1) and silica gel. Mobile phase HNO, (10 -1.0 M), DMSO-O.I M HN03(10 0, 8 2, 6 4, 4 6, and 2 8), dioxane-0.1 M HNO, 8.2, 6 4, 4 6, and 2 8). Conditions Ascending technique, layer thickness 0.1 mm. Detection Standard spot test reagents. Remarks Quantitative separation of Ru (5-50 pg) from synthetic mixtures of metal ions. Ru after detection with 2% thiourea solution in 2 M HCI was eluted from working plate with 0.1 M HCl, filtered and determined spectrophotometrically applying the p-nitrosodimethylaniline method. The standard deviation was 8-25 ppt. 

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