Cobaltdiiodid

Bezeichnung:Cobaltdiiodid

CAS-Nr15238-00-3

Englisch Name:COBALT(II) IODIDE

CBNumberCB9706215

SummenformelCoI2

Molgewicht312.74

MOL-Datei15238-00-3.mol

Synonyma

Cobaltdiiodid

Cobaltdiiodid physikalisch-chemischer Eigenschaften

Schmelzpunkt	>515 °C(lit.)
Siedepunkt	570°C
Dichte	5.45 g/mL at 25 °C(lit.)
Flammpunkt	570°C vac.
Löslichkeit	acetone: slightly soluble(lit.)
Aggregatzustand	powder
Farbe	White
Wichte	5.68
Wasserlöslichkeit	Soluble in water.
Sensitive	Hygroscopic
Merck	14,2443
Expositionsgrenzwerte	ACGIH: TWA 0.02 mg/m3
Stabilität	hygroscopic
CAS Datenbank	15238-00-3(CAS DataBase Reference)
EPA chemische Informationen	Cobalt iodide (CoI2) (15238-00-3)

Sicherheit

Kennzeichnung gefährlicher	Xn
R-Sätze:	20/21/22-36/37/38
S-Sätze:	26-36
WGK Germany	3
TSCA	Yes

Gefahreninformationscode (GHS)

COBALT(II) IODIDE Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R20/21/22:Gesundheitsschädlich beim Einatmen,Verschlucken und Berührung mit der Haut.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
Beschreibung
Cobalt 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.
Chemische Eigenschaften
Brownish red crystalline powder
Physikalische Eigenschaften
Exists 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).
Verwenden
Hygrometers; determination of water in organic solvents; catalyst.
Verwenden
Cobalt(II) iodide is used as a moisture and humidity indicator. It is also used as a catalyst.
synthetische
Cobalt(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.
Structure and conformation
Cobalt(II) iodide crystallizes in two polymorphs, the α- and β-forms. The α-polymorph comprises black hexagonal crystals, which turn dark green when exposed to air. Under vacuum at 500℃, samples of α-CoI2 sublime, forming the β-polymorph as yellow crystals. β-CoI2 also easily absorbs moisture from the air, converting into green hydrate. Below 400℃, β-CoI2 reverts back to the α-form. The anhydrous salt has the cadmium halide structure. The hexaaquo salt comprises separated [Co(H2O)6] 21 and iodide ions.

Cobaltdiiodid Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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