513-78-0 cadmium carbonate

Cadmium Bromide. The hydrated bromide is prepared by dissolution of cadmium carbonate, oxide, sulfide, or hydroxide in hydrobromic acid. The white crystalline material is cadmium bromide tetrahydrate [13464-92-1], CdBr2 4H2O, Ai/ 29s —1492.55 kJ/mol (—356.73 kcal/mol) (3)... 

Dimethyl ketals and enol ethers are stable to the conditions of oxime formation (hydroxylamine acetate or hydroxylamine hydrochloride-pyridine). Thioketals and hemithioketals are cleaved to the parent ketones by cadmium carbonate and mercuric chloride. Desulfurization of thioketals with Raney nickel leads to the corresponding methylene compounds, while thioenol ethers give the corresponding olefin. In contrast, desulfurization of hemithioketals regenerates the parent ketone. ... 

Note. Higher hydrolysis yields can be attained using aqueous DMSO and mercury(n) chloride and cadmium carbonate (5). 

Cadmium carbonate, 82 Carbodemetallation, 11 Carbometallation, 10 Carboxylic acids, 60,86 Ccrium(ni) chloride heptahydrate, 64 a-Chiral aldehyde, 112 Chiral lanthanide, 112 ff Chloro-a-lithio-a-trimethylsilanes, 21 2 Chloro-2-methylbutane, 135 4-Chloro-2-trimethylsilylamsole. 40... 

The presence of carbonate in the ammoniacal system offers a possibility of controlling the conditions for the formation of cadmium carbonate. After separation of nickel in the solvent extraction loop, cadmium is precipitated from the raffinate as carbonate. Thermal stripping reduces the ammonia concentration and some carbon dioxide will also be evaporated. Precipitation is completed by cooling the solution and by addition of... 

Compounds Cadmium oxide cadmium carbonate cadmium chloride cadmium sulfate cadmium sulfide... 

Cadmium carbonate occurs in nature as the mineral otavite. The commercial apphcations of this compound are limited. It is used as a catalyst in organic synthesis and as a starting material to prepare other cadmium salts. 

Cadmium carbonate is precipitated by adding excess ammonium carbonate to a solution of cadmium chloride ... 

Cadmium carbonate also may be obtained by slow absorption of cadmium oxide with carbon dioxide. 

Cadmium carbonate decomposes to cadmium oxide and carbon dioxide at 357°C. The compound dissolves in mineral acids forming their cadmium salts and carbon dioxide ... 

Cadmium carbonate forms a cyanide complex ion, Cd(CN)42+ in cyanide solutions. It dissolves in concentrated aqueous solutions of ammonium salts forming ammonium complexes. 

It also may be obtained by dissolving cadmium carbonate in 40% hydrofluoric acid solution, evaporating the solution and drying in vacuum at 150°C ... 

Cadmium oxide also may be prepared by several other routes starting with various cadmium salts. The compound can be made by thermal decomposition of cadmium carbonate or cadmium hydroxide ... 

CdO slowly absorbs carbon dioxide forming cadmium carbonate, CdCOs. 

It should be pointed out that this deposition was carried out for films ca. 50 nm thick the study was carried out with CdS window layers for solar cells in mind, which are usually thin. It is possible that much longer depositions result in different impurities. Thus the sparingly soluble cadmium carbonate and cyanamide will be converted to CdS if enough sulphide ion is formed with time (or, for the complex-decomposition mechanism, if enough adsorbed thiourea decomposes on the surface of the solid phases). Of course, longer time also means more thiourea decomposition products. 

FIG. 1.13 Spherical and cubic model particles with crystalline or amorphous microstructure (a) spherical zinc sulfide particles (transmission electron microscopy, TEM, see Section 1.6a.2a) x-ray diffraction studies show that the microstructure of these particles is crystalline (b) cubic lead sulfide particles (scanning electron microscopy, SEM, see Section 1.6a.2a) (c) amorphous spherical particles of manganese (II) phosphate (TEM) and (d) crystalline cubic cadmium carbonate particles (SEM). (Reprinted with permission of Matijevic 1993.)... 

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