Cobalt(II) fluoride Chemical Properties

Melting point:

1200 °C

Boiling point:

1400 °C

Density 

4.46 g/mL at 25 °C

solubility 

soluble in acid solutions

form 

powder

color 

Pink

Specific Gravity

4.46

Water Solubility 

Soluble in water, alcohol and acetone.

Crystal Structure

Rutile type

Sensitive 

Hygroscopic

Merck 

14,2440

crystal system

square

Space group

P42/mnm

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.4695	0.4695	0.3182	90	90	90	0.0701

Exposure limits

ACGIH: TWA 0.02 mg/m3; TWA 2.5 mg/m3
NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3

Stability:

hygroscopic

CAS DataBase Reference

10026-17-2(CAS DataBase Reference)

EPA Substance Registry System

Cobalt fluoride (CoF2) (10026-17-2)

Safety Information

Hazard Codes 

T,C

Risk Statements 

25-34

Safety Statements 

26-36/37/39-45-50A-28A

RIDADR 

UN 2923 8/PG 3

WGK Germany 

3

RTECS 

GG0770000

F 

21

Hazard Note 

Toxic

TSCA 

Yes

HazardClass 

6.1

PackingGroup 

III

HS Code 

28261990

Hazardous Substances Data

10026-17-2(Hazardous Substances Data)

MSDS

• Language:English Provider:Cobalt difluoride
• Language:English Provider:ACROS
• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

Cobalt(II) fluoride Usage And Synthesis

Preparation

Cobalt(II) fluoride is prepared by heating anhydrous cobalt(II) chloride or oxide in a stream of hydrogen fluoride:
CoCl2 + 2HF → CoF2 + 2HCl
CoO + 2HF → CoF2 + 2H2O
Also, cobalt(II) fluoride can be prepared as a tetrahydrate, CoF2•4H2O by dissolving cobalt(II) hydroxide in hydrofluoric acid. The tetrahydrate is then dehydrated to anhydrous fluoride. Elemental fluorine combines with cobalt at 450°C forming mixtures of cobalt(II)–and cobalt(III) fluorides.

Chemical Properties

Rose-red crystals or powder. Soluble in cold water and hydrofluoric acid. Decomposes in hot water. Ammine complexes can be prepared from the hydrate.

Physical properties

Red tetragonal crystal; density 4.46 g/cm³; melts at 1,127°C; vaporizes around 1,400°C; sparingly soluble in water; soluble in warm mineral acids; decomposes in boiling water. Tetrahydrate is red orthogonal crystal; density 2.22 g/cm³; decomposes on heating; soluble in water; di- and trihydrates are soluble in water.

Uses

Cobalt(II) fluoride can be used as a catalyst to alloy metals. It is also used for optical deposition, of which it tremendously improves optical quality. The compound may be used in dental care.

Uses

Catalyst for organic reactions.

General Description

Violet to red solid. Sinks and mixes slowly with water.

Reactivity Profile

Cobalt(II) fluoride is a toxic, light brown crystalline material, when exposed to water Cobalt(II) fluoride forms highly corrosive hydrofluoric acid. When heated to decomposition Cobalt(II) fluoride emits toxic fumes of metallic cobalt and fluorides [Lewis, 3rd ed., 1993, p. 344].

Hazard

Highly toxic.

Health Hazard

INHALATION: Inhalation of dust may cause pulmonary symptoms. EYES: Irritation. SKIN: Skin rashes, dermatitis. INGESTION: Nausea and vomiting caused by local irritation.
LD50 oral (rat): 150 mg/kg

Safety Profile

Poison by ingestion. When heated to decomposition it emits toxic fumes of Co and F-.

Cobalt(II) fluoride(10026-17-2)Related Product Information

• Boron trifluoride diethyl etherate
• Sulfur hexafluoride
• COBALT BLUE
• Potassium fluoride dihydrate
• Carbon tetrafluoride
• FLUORIDE STANDARD
• Cobalt chloride
• Ammonium fluoride
• Cobalt
• COBALT(III) OXIDE BLACK
• Aluminum fluoride
• Sodium fluoride
• Hydrogen fluoride
• Ammonium hydrogen difluoride
• Potassium fluoride
• Oxygen difluoride
• COBALT(II) FLUORIDE TETRAHYDRATE
• COBALT(III) FLUORIDE