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Merck
CN

939390

Cobalt(II) fluoride tetrahydrate

greener alternative

99.9% trace metals basis

Synonym(s):

Cobalt difluoride hydrate, Cobaltous fluoride tetrahydrate, Difluorocobalt hydrate

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About This Item

Linear Formula:
CoF2 · 4H2O
CAS Number:
13817-37-3
Molecular Weight:
168.99
UNSPSC Code:
12352200
MDL number:
MFCD00149656
NACRES:
NA.22
Assay:
98-102% (complexometric), 99.9% trace metals basis
Form:
powder or crystals
Solubility:
water: solubleslightly

Key Documents

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InChI key

MNHUTFNEBYCZAF-UHFFFAOYSA-L

InChI

1S/Co.2FH.4H2O/h;2*1H;4*1H2/q+2;;;;;;/p-2

SMILES string

O.O.O.O.F[Co]F

type

(High purity Salts)

assay

98-102% (complexometric), 99.9% trace metals basis

form

powder or crystals

greener alternative product characteristics

Catalysis
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impurities

≤1500 ppm (trace metals analysis)

color

faint red to dark red/pink

mp

200 °C

solubility

water: solubleslightly

density

2.19 g/mL at 25 °C (lit.)

anion traces

chloride (Cl-): ≤20 ppm

cation traces

Al: <20 ppm, Cu: <20 ppm, Fe: <20 ppm, K: <20 ppm, Mg: <20 ppm, Na: <20 ppm, Pb: <20 ppm

suitability

catalyst

application(s)

(Catalyst)

greener alternative category

Aligned

Quality Level

100

Related Categories

General description

Cobalt(II) fluoride tetrahydrate is a reddish crystalline solid with slight solubility in water. It serves as a source of cobalt for oxygen-sensitive applications. Additionally, it is employed as a catalyst biaryl cross-coupling reactions.
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Application

Cobalt(II) fluoride tetrahydrate is used as a starting material to synthesize 2-dimensional cobalt-fluoride-oxide as an oxygen evolution electrocatalysts using a rapid thermal annealing (RTA) method. In this process, the cobalt(II) fluoride tetrahydrate is placed in an alumina furnace at 400°C. After annealing for 20 minutes in air, the alumina crucible is removed and allowed to cool naturally to room temperature. The resulting products are then rinsed multiple times in deionized water and ethanol to remove any soluble impurities. Finally, the product is dried thoroughly in a vacuum oven at 60°C to obtain the 2D nanosheets sample. Furthermore, when combined with N-Heterocyclic Carbenes, Cobalt(II) fluoride tetrahydrate has been found to be highly effective as a catalyst for cross-coupling reactions between aryl Grignard reagents and aryl as well as heteroaryl halides. This reaction results in the formation of unsymmetrical biaryls.

pictograms

Skull and crossbonesCorrosion
GHS06,GHS05

signalword

Danger

Hazard Classifications

Acute Tox. 3 Dermal - Acute Tox. 3 Inhalation - Acute Tox. 3 Oral - Eye Dam. 1 - Skin Corr. 1B

Storage Class

6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects

wgk

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

Regulatory Information

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Certificates of Analysis (COA)

Lot/Batch Number
MKCW6479

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Rapid Thermal Annealing toward High-Quality 2D Cobalt Fluoride Oxide as an Advanced Oxygen Evolution Electrocatalyst
Huang, K. t al.
ACS sustainable chemistry & engineering, 8, 6905?6913-6905?6913 (2020)
Takuji Hatakeyama et al.
Journal of the American Chemical Society, 131(33), 11949-11963 (2009-07-31)
Combinations of N-heterocyclic carbenes (NHCs) and fluoride salts of the iron-group metals (Fe, Co, and Ni) have been shown to be excellent catalysts for the cross-coupling reactions of aryl Grignard reagents (Ar(1)MgBr) with aryl and heteroaryl halides (Ar(2)X) to give

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