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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

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

Group 4: Flammable liquids + Type 2 petroleums + Hazardous rank III + Water insoluble liquid

fsl

Substances Subject to be Indicated Names

ishl_indicated

Substances Subject to be Notified Names

ishl_notified

86578-250ML:4548173946405 + 86578-BULK: + 86578-1L:4548173946399 + 86578-6X1L: + 86578-VAR:

jan

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Certificates of Analysis (COA)

Lot/Batch Number
BCCP2261
0000478575
0000478575
BCCN9137
BCCN3373

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Preparation of silicon oxycarbide glass fibers from organically modified silicates
Hu, Yi
Journal of materials science & technology, 35(12), 3155-3159 (2000)
Preparation of spherical silica particles by Stober process with high concentration of tetra-ethyl-orthosilicate
Wang XD, et al.
Journal of Colloid and Interface Science, 1(341), 23-29 (2010)
A spectroscopic study of an anhydrous tetraethyl orthosilicate-boric acid-ethanol system
Zha Congji, et al.
Journal of Sol-Gel Science and Technology, 13(1-3), 103-107 (1998)
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)
Reaction of poly (vinyl butyral) with tetraethyl orthosilicate: grafting of siloxane chains and new composites
Annenkov VV, et al.
Polymer International, 53(6), 772-776 (2004)
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