86578

Tetraethyl orthosilicate

≥99.0% (GC)

• Synonym(s): Orthosilicic acid tetraethyl ester, Silicon tetraethoxide, TEOS, Tetraethoxysilane, Tetraethoxysilicon(IV), Tetraethyl silicate
• Linear Formula: Si(OC₂H₅)₄
• CAS Number: 78-10-4
• Molecular Weight: 208.33
• Beilstein: 1422225
• EC Number: 201-083-8
• MDL number: MFCD00009062
• UNSPSC Code: 12352103
• PubChem Substance ID: 57653167
• NACRES: NA.22

Properties

• vapor density: 7.2 (vs air)
• vapor pressure: <1 mmHg ( 20 °C)
• Assay: ≥99.0% (GC)
• form: liquid
• refractive index: n20/D 1.382 (lit.); n20/D 1.383
• bp: 168 °C (lit.)
• density: 0.933 g/mL at 20 °C (lit.)
• SMILES string: CCO[Si](OCC)(OCC)OCC
• InChI: 1S/C8H20O4Si/c1-5-9-13(10-6-2,11-7-3)12-8-4/h5-8H2,1-4H3
• InChI key: BOTDANWDWHJENH-UHFFFAOYSA-N

Description

General description

Tetraethyl orthosilicate (TEOS) is an inorganic material that can be used as a silica source for the synthesis of silica-based materials such as silicon dioxide, silicon oxycarbides, silanol, siloxane polymer, and organosilicon thin films for a variety of applications. It can also be used in the synthesis of blended membranes, and the production of aerogel. Other applications include coatings for carpets and other objects.

Application

Tetraethyl orthosilicate (TEOS) can be used:

• As a reagent along with ferric chloride in the synthesis of dihydropyrimidinones.
• As a modifier in fabrication of humidity sensing material, poly(2-acrylamido-2-methylpropane sulfonate) (poly-AMPS).
• As a medium to synthesize triarylamines and diaryl ethers via copper catalyzed, ligand free-Ullmann reaction.
• As a precursor for the preparation of silica xerogel which finds application in pharmaceutical drug carriers.
• As a precursor for the synthesis of spherical silica particles by Stober process.

Commonly used as a precursor to prepare xerogel

Will interact with dodecylamine in the formation of intercalation compounds of H⁺-magadiite and used in a study of mixed-metal bioactive glasses.

Safety Information

• Pictograms: GHS02,GHS07
• Signal Word: Warning
• Hazard Statements: H226,H319,H332,H335
• Precautionary Statements: P210 - P233 - P240 - P241 - P304 + P340 + P312 - P305 + P351 + P338
• Hazard Classifications: Acute Tox. 4 Inhalation - Eye Irrit. 2 - Flam. Liq. 3 - STOT SE 3
• Target Organs: Respiratory system
• Storage Class Code: 3 - Flammable liquids
• WGK: WGK 1
• Flash Point(F): 113.0 °F - closed cup
• Flash Point(C): 45 °C - closed cup
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves