structure of Cobalt(II) stearate

Cobalt(II) stearate

CAS No.: 1002-88-6
M. Wt: 342.40300
M. Fa: C18H35CoO2+
InChI Key: AMFIJXSMYBKJQV-UHFFFAOYSA-L
Appearance: Black Solid

Names and Identifiers of Cobalt(II) stearate

CAS Number

1002-88-6

EC Number

237-016-4

IUPAC Name

cobalt(2+);octadecanoate

InChI

InChI=1S/2C18H36O2.Co/c2*1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20;/h2*2-17H2,1H3,(H,19,20);/q;;+2/p-2

InChIKey

AMFIJXSMYBKJQV-UHFFFAOYSA-L

Canonical SMILES

CCCCCCCCCCCCCCCCCC(=O)[O-].CCCCCCCCCCCCCCCCCC(=O)[O-].[Co+2]

UNII

000J930IO1

Physical and chemical properties of Cobalt(II) stearate

Boiling Point

359.4ºC at 760 mmHg

Density

1.71

Exact Mass

342.19700

Exposure Limits

ACGIH: TWA 10 mg/m3; TWA 3 mg/m3

Flash Point

162.4ºC

LogP

4.99780

Melting Point

109-112ºC(lit.)

Molecular Formula

C18H35CoO2+

Molecular Weight

342.40300

PSA

40.13000

RTECS

RG1212000

Storage condition

under inert gas (nitrogen or Argon) at 2-8°C

Vapour Pressure

8.58E-06mmHg at 25°C

Water Solubility

Insoluble in water.

λmax

275nm(MCH)(lit.)

Solubility of Cobalt(II) stearate

Solvent Dissolution Behavior Temperature Effect pH Effect
Water Almost insoluble Increasing temperature shows no significant improvement in solubility May undergo partial hydrolysis under acidic conditions, but remains insoluble; still insoluble under alkaline conditions
Ethanol Slightly soluble or poorly soluble Heating slightly increases solubility Minimal pH influence, as ethanol is a non-aqueous solvent
Toluene Soluble, forming a homogeneous solution Solubility increases with rising temperature Essentially unaffected by pH (non-aqueous system)
Acetone Insoluble or extremely poorly soluble Increasing temperature has negligible effect No significant pH effect
Chloroform Soluble Solubility increases with temperature rise No pH influence
Diethyl ether Slightly soluble Mild heating promotes dissolution No pH effect
Mineral oil Can be dispersed or partially dissolved, commonly used in lubricants Increasing temperature aids dispersion and dissolution No pH effect
Isopropanol Difficult to dissolve Heating improves solubility slightly Effect is insignificant

Safety Information of Cobalt(II) stearate

Pictograms

Signal Word

 Danger

Safety Data Sheet
Supports customized editing of SDS information and downloading in PDF documents.

Key Milestone of Cobalt(II) stearate

Time Event / Milestone Background & Significance
Mid-19th century (ca. 1840s–1860s) First synthesis and study of fatty-acid metal salts, including stearates As organic chemistry and saponification research advanced, scientists began systematically preparing metal salts of fatty acids. Stearic acid (octadecanoic acid), a common fatty acid, was likely converted into its cobalt salt in laboratories during this period, although no specific literature records its isolated application.
Late 19th – early 20th century Early trials as a drier in oil-based paints With the growth of the paint industry, cobalt salts (e.g., cobalt naphthenate, cobalt stearate) were found to accelerate oxidative polymerization of drying oils (e.g., linseed oil) thanks to their strong oxidative catalytic power, thereby shortening drying times. Cobalt stearate, owing to its good lipophilicity and high stability, was included in these investigations.
1920s–1930s Industrial-scale production and widespread adoption in coatings Cobalt stearate became a standard “surface-drying” siccative in oil paints and varnishes, establishing itself as one of the benchmark additives in the coatings industry. Manufacturing processes (e.g., double-decomposition between stearic acid and a cobalt salt) reached maturity.
1940s–1950s Expansion into rubber and plastics as stabilizer and activator Cobalt stearate was adopted as a vulcanization activator for synthetic rubbers such as chloroprene rubber (CR) and as a component of heat stabilizers for polyvinyl chloride (PVC), improving processing stability.
1970s–1980s Environmental and health concerns trigger substitution research Potential toxicity of cobalt compounds (skin sensitization, environmental accumulation) led to restrictions on their use in consumer coatings in Europe and North America, spurring the development of low-cobalt or cobalt-free driers (e.g., zirconium-, calcium-, or iron-based systems). Nevertheless, cobalt stearate continued to be used in industrial coatings and niche applications.
1990s–2000s Emerging applications in specialty materials Cobalt stearate served as a precursor for cobalt-based nanomaterials, catalysts, or magnetic materials. It also persisted as an additive in lubricating greases, printing inks, and—under restricted conditions—cosmetics.
2010s–present Strict regulation under REACH drives specialization Under the EU’s REACH regulation, cobalt stearate is classified as a substance requiring authorization for certain uses (e.g., coatings), pushing the industry toward safer alternatives. Nonetheless, it remains irreplaceable in high-performance industrial coatings and as a precursor for electronic materials.

Applications of Cobalt(II) stearate

Cobalt(II) stearate has diverse applications across various industries:

  • Rubber Industry: It serves as a high-performance bonding agent for natural rubber and synthetic rubbers, enhancing adhesion to metals such as brass and zinc-plated steel.
  • Catalyst in Organic Synthesis: Utilized in polymerization reactions and other organic synthesis processes.
  • Pigment Production: Cobalt compounds are known for their vibrant colors, making them useful in pigments for paints and ceramics.

Interaction Studies of Cobalt(II) stearate

Studies on the interactions of cobalt(II) stearate with other compounds reveal its potential use as a stabilizer and bonding agent. Its ability to enhance adhesion properties makes it valuable in composite materials where metal-to-rubber bonding is critical. Additionally, investigations into its biological interactions highlight both its essential role in certain metabolic pathways and the potential health risks associated with exposure to cobalt compounds.

Physical sample testing spectrum (NMR) of Cobalt(II) stearate

Physical sample testing spectrum (NMR) of Cobalt(II) stearate