Cobaltous iodide
Basic information
- CAS
15238-00-3- Standard SMILES
[Co+2].[I-].[I-]- InChIKey
AVWLPUQJODERGA-UHFFFAOYSA-L- Molecular formula
- CoI2
- Average molar mass
- 312.7421 g/mol
- Monoisotopic mass
- 312.74214
Overview
Cobalt(II) iodide is a iodide of cobalt. It is used to detect the presence of water. Cobalt is a metallic element with the atomic number 27. It is found naturally in rocks, soil, water, plants, and animals. In small amounts cobalt is an essential element for life, as it is part of vitamin B12. However, excess exposure is known to exhibit toxic effects. (L29, L30, L33)
Names & identifiers
- Preferred name
- Cobaltous iodide
- IUPAC
- cobalt(2+) diiodide
- English name
- COBALT(II) IODIDE
- Molecular formula
- CoI2
- Molecular weight
- 312.74
Names & synonyms
Cobaltous iodideCOBALT IODIDERTJ1W9DF34UNII-RTJ1W9DF34EINECS 239-283-2Cobaltum IodatumRefChem:58324239-283-2COBALT(II) IODIDECobalt diiodidecobalt(2+);diiodideCobalt iodide (CoI2)
Show more names
cobaltiodide(coi2)CobaltiodideanhydrousCobalt(Ⅱ) iodide dihydratecobalt(ii) iodide, ultra dry
CoI2cobalt(2+) diiodidecobalt(II) diiodideMFCD00016030Cobalt(II); iodideCOBALTOUS IODIDE [MI]SCHEMBL320751DTXSID301014304
Database identifiers
- CAS
15238-00-3- PubChem CID
- 84850
- DTXSID
DTXSID301014304- UNII
- RTJ1W9DF34
- EC Number
- 239-283-2
- Nikkaji
- J43.781F
Properties
Computed structural properties
- Topological polar surface area
- 0 Ų
- Hydrogen bond donors
- 0
- Hydrogen bond acceptors
- 2
- Rotatable bonds
- 0
- Heavy atoms
- 3
- Formal charge
- 0
- Complexity
- 0
Experimental & physicochemical properties
Chemical ClassesMetals -> Metals, Inorganic Compounds
Physical Description
alpha-Form: Black graphite-like solid; Highly hygroscopic turning blackish-green in air; beta-Form: Highly hygroscopic ochre-yellow solid; Deliquescent in moist air forming green droplets; [Merck Index] Black hygroscopic beads; [Alfa Aesar MSDS]
Physicochemical properties
- Melting point
- 515 °C · >515 °C(lit.)
- Boiling point
- 570 °C · 570°C
- Density
- 5.45 g/mL · 5.45 g/mL at 25 °C(lit.)
- Flash point
- 570 °C · 570°C vac.
- solubility
- acetone: slightly soluble(lit.)
- form
- powder
- color
- White
- Specific Gravity
- 5.68 · 5.68
- Water Solubility
- Soluble in water.
- Sensitive
- Hygroscopic
- Merck
Safety & regulation
Safety information is for reference only and does not replace the supplier’s Safety Data Sheet (SDS), applicable regulations, or professional assessment.
GHS classification
GHS Classification
Warning
H302 (89.4%): Harmful if swallowed [Warning Acute toxicity, oral]
P203, P261, P264, P264+P265, P270, P271, P272, P280, P301+P317, P302+P352, P304+P340, P305+P351+P338, P317, P318, P319, P321, P330, P332+P317, P333+P317, P337+P317, P362+P364, P403+P233, P405, and P501 (click each P-code to see the statement)
Aggregated GHS information provided per 47 reports by companies from 6 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Hazard information
Hazards SummaryAn irritant; May cause skin sensitization; Suspected mutagen; [Alfa Aesar MSDS] See Cobaltous chloride. See Iodine for the TLV of Iodides.
Hazard Classes and CategoriesAcute Tox. 4 (89.4%)
Safety & protection
Exposure Control and Personal ProtectionBiological Exposure Indices (BEI) [ACGIH] - Cobalt in urine = 15 ug/L; sample at end of shift at end of workweek;
Minimum Risk LevelChronic Inhalation: 0.0001 mg/m3 (L134)
Intermediate Oral: 0.01 mg/kg/day (L134)
Threshold Limit Values (TLV)0.02 [mg/m3], as Co [0.01 ppm, inhalable fraction and vapor (iodides)]
Toxicology
TreatmentTreatment of cobalt poisoning is symptomatic. (L29)
Chemistry & industry
Pharmacology
Metabolism/Metabolites
Cobalt is absorbed though the lungs, gastrointestinal tract, and skin. Since it is a component of the vitamin B12 (cyanocobalamin), it is distributed to most tissues of the body. It is transported in the blood, often bound to albumin, with the highest levels being found in the liver and kidney. Cobalt is excreted mainly in the urine and faeces. (L29)
Uses & manufacturing
Uses
Used as a humidity indicator and catalyst; [Merck Index]
Cobalt(II) iodide is used to detect the presence of water. (L33)
General Manufacturing InformationCobalt iodide (CoI2): ACTIVE
Applications
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.
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.
Preparation methods
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.
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