COBALT(II) IODIDE

COBALT(II) IODIDE Basic information
Product Name:COBALT(II) IODIDE
Synonyms:Cobalt(II)iodide,anhydrous,99.5%;cobalt(ii) iodide, anhydrous;cobalt(ii) iodide, ultra dry;Cobalt(II) iodide, ultra dry, 99.999% (metals basis);COBALT(II)IODIDE,ANHYDROUS,MIN.95%(99.5%-CO);COBALT(II) IODIDE ANHYDROUS BEADS -1&;Cobalt(II)iodide,anhydrous,99.5%(metalsbasis);Cobalt(II)iodideanhydrous(CoI2
CAS:15238-00-3
MF:CoI2
MW:312.74
EINECS:239-283-2
Product Categories:metal halide;Catalysis and Inorganic Chemistry;Cobalt Salts;CobaltMetal and Ceramic Science;Crystal Grade Inorganics;Chemical Synthesis;Metal and Ceramic Science;Salts
Mol File:15238-00-3.mol
COBALT(II) IODIDE Structure
COBALT(II) IODIDE Chemical Properties
Melting point >515 °C(lit.)
Boiling point 570°C
density 5.45 g/mL at 25 °C(lit.)
Fp 570°C vac.
solubility acetone: slightly soluble(lit.)
form powder
color White
Specific Gravity5.68
Water Solubility Soluble in water.
Sensitive Hygroscopic
Merck 14,2443
Exposure limitsACGIH: TWA 0.02 mg/m3
Stability:hygroscopic
CAS DataBase Reference15238-00-3(CAS DataBase Reference)
EPA Substance Registry SystemCobalt iodide (CoI2) (15238-00-3)
Safety Information
Hazard Codes Xn
Risk Statements 20/21/22-36/37/38
Safety Statements 26-36
WGK Germany 3
TSCA Yes
MSDS Information
ProviderLanguage
SigmaAldrich English
ALFA English
COBALT(II) IODIDE Usage And Synthesis
DescriptionCobalt iodide appears as black crystals with a slight ‘iodine’-like odour. When heated to decomposition, it may emit toxic fumes of iodine and oxides of nitrogen. Anhydrous cobalt (II) iodide is sometimes used to test for the presence of water in various solvents. Cobalt (II) iodide is used as a catalyst, for example, in carbonylations. It catalyses the reaction of diketene with Grignard reagents, useful for the synthesis of terpenoids.
Chemical PropertiesBrownish red crystalline powder
Physical propertiesExists in two isomorphous forms, α- and ?-forms; both modifications highly hygroscopic. The α-form is black hexagonal crystal; density 5.58 g/cm3; turns dark green in air; melts at 560°C; disolves in water giving pink coloration. The α-forms sublimes in vacuo, partly forming an isomorous yellow modification-the anhydrous β-form.
The β-modification is a yellow powder; density 5.45 g/cm3; converts to the α-form when heated to 400°C; absorbs moisture from air, the yellow powder becoming green droplets; dissolves readily in water forming a colorless solution which turns pink on heating.
The hexahydrate is red hexagonal crystals; density 2.90 g/cm3; loses water at 130°C giving anhydrous iodide; soluble in water, ethanol, acetone, chloroform and ether, forming colored solutions, (while the aqueous solution is red below 20°C and green above this temperature; the salt forms blue solution in ethanol, chloroform and ether).

UsesHygrometers; determination of water in organic solvents; catalyst.
UsesCobalt(II) iodide is used as a moisture and humidity indicator. It is also used as a catalyst.
PreparationCobalt(II) iodide is prepared by heating cobalt powder in a stream of hydrogen iodide at 400 to 450°C:
Co + 2HI → CoI2 + H2
The product obtained is the black crystalline α-form.
Cobalt(II) iodide also may be made by heating cobalt powder with iodine vapor.


COBALT(II) IODIDE Preparation Products And Raw materials
NICKEL SULFIDE Bismuth trioxide Phosphorus pentasulfide ZINC TELLURIDE TIN(IV) IODIDE IRON (II) FLUORIDE Lithium iodide COBALT(II) IODIDE HYDRATE DIIODO(BIS(DIPHENYLPHOSPHINO)ETHANE)COB& COBALT(II) IODIDE DIHYDRATE COBALT(+2)IODIDE HYDRATE COBALT(II) IODIDE

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