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Merck

86578

Tetraethyl orthosilicate

≥99.0% (GC)

Synonym(s):

Orthosilicic acid tetraethyl ester, Silicon tetraethoxide, TEOS, Tetraethoxysilane, Tetraethoxysilicon(IV), Tetraethyl silicate

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About This Item

Linear Formula:
Si(OC2H5)4
CAS Number:
78-10-4
Molecular Weight:
208.33
UNSPSC Code:
12352103
NACRES:
NA.22
PubChem Substance ID:
57653167
EC Number:
201-083-8
Beilstein/REAXYS Number:
1422225
MDL number:
MFCD00009062
Assay:
≥99.0% (GC)
Technique(s):
GC/GC: suitable
Bp:
168 °C (lit.)
Vapor pressure:
<1 mmHg ( 20 °C)

Key Documents

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InChI key

BOTDANWDWHJENH-UHFFFAOYSA-N

InChI

1S/C8H20O4Si/c1-5-9-13(10-6-2,11-7-3)12-8-4/h5-8H2,1-4H3

SMILES string

CCO[Si](OCC)(OCC)OCC

vapor density

7.2 (vs air)

vapor pressure

<1 mmHg ( 20 °C)

assay

≥99.0% (GC)

form

liquid

technique(s)

GC/GC: suitable

refractive index

n20/D 1.382 (lit.), n20/D 1.383

bp

168 °C (lit.)

density

0.933 g/mL at 20 °C (lit.)

Quality Level

200

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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

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.
  • 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.

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

pictograms

FlameExclamation mark
GHS02,GHS07

signalword

Warning

Hazard Classifications

Acute Tox. 4 Inhalation - Eye Irrit. 2 - Flam. Liq. 3 - STOT SE 3

target_organs

Respiratory system

Storage Class

3 - Flammable liquids

wgk

WGK 1

flash_point_f

113.0 °F - closed cup

flash_point_c

45 °C - closed cup

ppe

Eyeshields, Faceshields, Gloves, type ABEK (EN14387) respirator filter

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Certificates of Analysis (COA)

Lot/Batch Number
BCCG5120
BCCG3312
BCCG3313
BCCF9426
BCCF4830

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Ferric chloride/tetraethyl orthosilicate as an efficient system for synthesis of dihydropyrimidinones by Biginelli reaction
Cepanec I, et al.
Tetrahedron, 17(61), 4275-4280 (2005)
Use of poly (2-acrylamido-2-methylpropane sulfonate) modified with tetraethyl orthosilicate as sensing material for measurement of humidity
Su PG, et al.
Analytica Chimica Acta, 1-2(449), 103-109 (2001)
Ullmann reaction in tetraethyl orthosilicate: a novel synthesis of triarylamines and diaryl ethers
Zhao Y, et al.
Chemical Communications (Cambridge, England), 30(449), 3186-3188 (2007)
Silica xerogels as pharmaceutical drug carriers
Quintanar-Guerrero D, et al.
Expert Opinion on Drug Delivery, 5(6), 485-498 (2009)
Removal of Cu (II) and Fe (II) ions through thin film composite (TFC) with hybrid membrane
Sulaiman NA, et al.
Journal of Engineering Science and Technology, 36-49 (2016)
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