Samarium sulfate

Under hydrothermal conditions, the hydrolysis of samarium sulfate in presence of ethylenediamine (en) leads to the formation of a diamond-like... 

Koshimura, H., Recovery of samarium from scrap of samarium-cobalt alloy with double salt of samarium sulfate. In Report of Tokyo Metropolitan Industrial Technology Center 1987, 16, pp. 113-118. 

To date our applications have been to kinetic studies of aqueous samarium sulfate (7), silver thiosulfate (8), and a variety of macrocyclic systems (9). It can be persuasively argued that the same systems could have been studied as effectively by other ultrasonic techniques, particularly the pulse method (10), Our response would be that the "looking at sound" experiment lends itself particularly well to minicomputerization and the latter greatly speeds the data taking process (by a factor of more than ten) and at the same time significantly reduces imprecision in the experimental data. 

Ethyl sulfate Flammable liquids Fluorine Formamide Freon 113 Glycerol Oxidizing materials, water Ammonium nitrate, chromic acid, the halogens, hydrogen peroxide, nitric acid Isolate from everything only lead and nickel resist prolonged attack Iodine, pyridine, sulfur trioxide Aluminum, barium, lithium, samarium, NaK alloy, titanium Acetic anhydride, hypochlorites, chromium(VI) oxide, perchlorates, alkali peroxides, sodium hydride... 

The monazite sand is heated with sulfuric acid at about 120 to 170°C. An exothermic reaction ensues raising the temperature to above 200°C. Samarium and other rare earths are converted to their water-soluble sulfates. The residue is extracted with water and the solution is treated with sodium pyrophosphate to precipitate thorium. After removing thorium, the solution is treated with sodium sulfate to precipitate rare earths as their double sulfates, that is, rare earth sulfates-sodium sulfate. The double sulfates are heated with sodium hydroxide to convert them into rare earth hydroxides. The hydroxides are treated with hydrochloric or nitric acid to solubihze all rare earths except cerium. The insoluble cerium(IV) hydroxide is filtered. Lanthanum and other rare earths are then separated by fractional crystallization after converting them to double salts with ammonium or magnesium nitrate. The samarium—europium fraction is converted to acetates and reduced with sodium amalgam to low valence states. The reduced metals are extracted with dilute acid. As mentioned above, this fractional crystallization process is very tedious, time-consuming, and currently rare earths are separated by relatively easier methods based on ion exchange and solvent extraction. 

Samarium sesquioxide may be prepared by two methods (1) thermal decomposition of samarium carbonate, hydroxide, nitrate, oxalate or sulfate ... 

Arene(tricarbonyl)chromium complexes, 19 Nickel boride, 197 to trans-alkenes Chromium(II) sulfate, 84 of anhydrides to lactones Tetrachlorotris[bis(l,4-diphenyl-phosphine)butane]diruthenium, 288 of aromatic rings Palladium catalysts, 230 Raney nickel, 265 Sodium borohydride-1,3-Dicyano-benzene, 279 of aryl halides to arenes Palladium on carbon, 230 of benzyl ethers to alcohols Palladium catalysts, 230 of carboxylic acids to aldehydes Vilsmeier reagent, 341 of epoxides to alcohols Samarium(II) iodide, 270 Sodium hydride-Sodium /-amyloxide-Nickel(II) chloride, 281 Sodium hydride-Sodium /-amyloxide-Zinc chloride, 281 of esters to alcohols Sodium borohydride, 278 of imines and related compounds Arene(tricarbonyl)chromium complexes, 19... 

Triphenylbismuth carbonate. ISOXAZOLES Samarium(II) iodide. LACTONES Sodium benzeneselenolate. METHOXYTHIOANISOLES Sodium-Hexamethylphosphoramide. OXAZIRIDINES Iron(II) sulfate. OXETANES Cyanotrimethylsilane. 

The cerium oxide obtained on calcination is treated with nitric acid and then hydrolysed in the presence of sulfate to give basic sulfate of 99.9% purity. The cerium-free rare earth chlorides are subjected to a solvent extraction step to produce a samarium concentrate as shown in Fig. 1.15. 

Separation of Samarium and Europium. One hundred thirty-five grams of samarium-europium acetate in 450 ml. of solution at 60° was treated with 1.0 g. of sodium in 80 ml. of mercury. One-half milliliter of 30% sulfuric acid was added, and the precipitated europium (II) sulfate... 

Samarium(III) sulfate octahydrate +1710 Strontium chromate SrCrO -5.1... 

Of the other lanthanides, europium(III) chloride, an / ion, and terbium(III) chloride, an / ion, have been reported to fluoresce weakly in dimethylformamide solution [16]. The chloride and sulfate salts of samarium(III), an / ion, of gado-linium(III), an f" ion, and of dysprosium(III), an/ ion, are also reported to luminesce weakly in solution [16]. All five of these lanthanides give rise to weak lines which have been assigned to/->-/transitions. 

Di-0-benzyl-3,4-0-isopropylidene-D-mannitol was ring closed to afford a 9 1 cis/trans mixture of 189 in high yield by (Swern) oxidation and radical cyclization of the dialdehyde using samarium iodide in fcrf-butanol. The cis-diastereoisomer was selectively converted into a cis-cyclic sulfate which underwent cleavage upon treatment with potassium tert-butoxide to afford a cyclo-... 

Yttrium-group earths, containing samarium, separation from mona-zite by magnesium nitrate, 2 56 separation by fractional crystallization of bromates, 2 56, 62 separation from cerium earths by double-sulfate method, 2 44, 46... 

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