Cesium sulfate

The residue is leached to give cesium sulfate solution, which can be converted to cesium chloride by ion exchange on Dowex 50 resin and elution with 10% HCl, treatment using ammonia or lime, to precipitate the alurninum, or by solvent extraction, followed by purification at neutral pH using hydrogen peroxide or ammonia. 

Thermal Decomposition. Cesium a2ide [22750-57-8] CsN, which is prepared by reacting aqueous solutions of cesium sulfate and barium a2ide, melts at 326°C and decomposes at 390°C to cesium metal (32) ... 

Cesium Sulfates. Cesium sulfate [10294-54-9], Qs O, mol wt 361.87, theoretical cesium content 73.46 wt %, forms colorless, rhombic, or... 

Cesium fluoroxy sulfate [5, dl is prepared by reacting fluorine with cesium sulfate in aqueous solution [20, 21] (equation 3). 

Cesium hydroxide is prepared hy electrolysis of cesium salts to obtain cesium metal, which then reacts with water to yield hydroxide. It also is prepared hy the action of harium hydroxide with an aqueous solution of cesium sulfate. 

Carl Friedrich Plattner was bom in 1800 at Klein-Waltersdorf near Freiberg, was educated at the Freiberg School of Mines, and became a professor of metallurgy and blowpipe analysis there. He was a great master of the art and science of analytical chemistry, and applied the blowpipe even to quantitative analysis. He made many promising experiments on the oxidation of sulfur dioxide to the trioxide by means of catalysts. Before the work was completed, however, he was stricken with apoplexy, which terminated fatally in 1858 (68). When F lix Pisani (1831—1920) examined pollucite four years after the discovery of cesium, he found that Plattner had mistaken his cesium sulfate for a mixture of the sulfates of sodium and potassium (8, 37, 58). 

A chemist prepares an aqueous solution of cesium sulfate, 082(804)3, swirling the beaker in her gloved hand to promote dissolution. She notices something, momentarily furrows her brow, and then smiles knowingly. She nestles the beaker into a bed of crushed ice within a bucket. What did the chemist notice, why was she briefly confused, and why did she place the dissolving cesium sulfate on ice ... 

Cesium fluoroxysulfate, CsSO.,f (1). Mol. wt. 247.97, stable solid at - I O, stable in CHyCN for about a day. The reagent is prepared by reaction of cesium sulfate in water with fluorine.1... 

The S NMR spectrum of thiophene was initially studied as a solution in carbon disulfide <1970M1379> and its chemical shift relative to carbon disulfide was —220 - - 6 while those of 2- and 3-methylthiophene were -178-1-9 and — 197 + 26, respectively. The S chemical shift of neat thiophene (relative to aqueous cesium sulfate) was found to be —119ppm, while that of tetrahydrothiophene was —354ppm (Table 49) <1985J(F2)63>. 

Chemical shifts were measured relative to external 2 mol dm aqueous cesium sulfate. 

The fluorination of a saturated aqueous solution of rubidium sulfate or cesium sulfate with dilute elemental fluorine at temperatures between -4 and O C results in the formation of the corresponding fluoroxysulfate Cesium and rubidium fluoroxysulfate can be stored... 

Xenon difluoride is a better fluorinaling reagent for vinyltin compounds than cesium fluoroxysulfate (compare entry 1 in Tables 1 and 2). Besides this, cesium fluoroxysulfate (which can be prepared from elemental fluorine and cesium sulfate) is known to be shock sensitive and to undergo detonation upon hcaling. However, cesium fluoroxysulfate is the alternative choiee in the ease of some vinyltin compounds, such as 2- and 3-(trimethylstannyl)indolcs (Table 2, entries 5 7), whose reactions with xenon difluoride are not effective. 

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