SILICON TETRAACETATE Property

Melting point:

111-115 °C(lit.)

Boiling point:

148 °C5 mm Hg(lit.)

Density 

1,18 g/cm³

vapor density 

>1 (vs air)

Flash point:

>110°C

storage temp. 

-20°C

solubility 

Soluble in acetone and benzene.

form 

crystal

color 

white

Water Solubility 

soluble acetone, benzene [MER06]

Hydrolytic Sensitivity

7: reacts slowly with moisture/water

Sensitive 

Moisture Sensitive

Merck 

14,8498

BRN 

994868

CAS DataBase Reference

562-90-3(CAS DataBase Reference)

EPA Substance Registry System

Silicon tetraacetate (562-90-3)

Safety

Hazard Codes 

C

Risk Statements 

34

Safety Statements 

26-36/37/39-45

RIDADR 

UN 3261 8/PG 2

WGK Germany 

3

F 

10

TSCA 

Yes

HazardClass 

8

PackingGroup 

II

HS Code 

29159000

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H314Causes severe skin burns and eye damage

Precautionary statements

P260Do not breathe dust/fume/gas/mist/vapours/spray.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P363Wash contaminated clothing before reuse.

SILICON TETRAACETATE Chemical Properties,Usage,Production

Introduction

Tetraacetoxysilane is a clear to yellowish liquid with acrid odor of acetic acid (vinegar). It hydrolyzes in the presence of moisture (acetic acid is released) to form silanols, which can react with themselves to pro-duce siloxanes or bind to inorganic substrates.

Chemical Properties

Off-white crystalline solid

Uses

Silicon tetraacetate is used in the preparation of silicon dioxide thin films by a direct photochemical vapor deposition method. It serves as a precursor to prepare silicon complexes with monofunctional bidentate Schiff bases. It is also used as an alternative to silicon hydride and alkoxide for low-temperature silicon dioxide production. Further, it reacts with ethanol in the absence of water to get silica gel and ethyl acetate. In addition, it is employed as a sol-gel precursor.

General Description

Silicon tetraacetate is an alternative to silicon hydride and alkoxide for low-temperature SiO₂ production. Silicon tetraacetate reacts with ethanol in absence of water to form silica gel and ethyl acetate. Silicon tetraacetate is reported as a sol-gel precursor.

Purification Methods

It can be crystallised from mixtures of CCl4 and pet ether or Et2O, or from acetic anhydride and then dried in a vacuum desiccator over KOH. Ac2O adheres to the crystals and is removed first by drying at room temperature, then at 100o for several hours. It is soluble in Me2CO, is very hygroscopic and effervesces with H2O. It decomposes at 160-170o. [Schenk in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 701 1963, Beilstein 2 H 171.]