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
• Assay: ≥99.0% (GC)
• bp: 168 °C (lit.)
• vapor pressure: <1 mmHg ( 20 °C)

Properties

• vapor density: 7.2 (vs air)
• Quality Level: 200
• 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,[1] silicon oxycarbides,[2] silanol,[3] siloxane polymer,[4] and organosilicon thin films[5] for a variety of applications. It can also be used in the synthesis of blended membranes, and the production of aerogel.[6] Other applications include coatings for carpets and other objects.[7]

Application

Commonly used as a precursor to prepare xerogel

Tetraethyl orthosilicate (TEOS) can be used:

• As a reagent along with ferric chloride in the synthesis of dihydropyrimidinones.[8]
• As a modifier in fabrication of humidity sensing material, poly(2-acrylamido-2-methylpropane sulfonate) (poly-AMPS).[9]
• As a medium to synthesize triarylamines and diaryl ethers via copper catalyzed, ligand free-Ullmann reaction.[10]
• As a precursor for the preparation of silica xerogel which finds application in pharmaceutical drug carriers.[11]
• As a precursor for the synthesis of spherical silica particles by Stober process.[12]

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