Tetramethyl orthosilicate
Synonym(s):Tetramethoxysilane;Tetramethyl orthosilicate
- CAS NO.:681-84-5
- Empirical Formula: C4H12O4Si
- Molecular Weight: 152.22
- MDL number: MFCD00008341
- EINECS: 211-656-4
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-03-14 15:18:27
What is Tetramethyl orthosilicate?
Description
Tetramethyl orthosilicate is the chemical compound with the formula Si(OCH3)4. This molecule consists of four methoxy groups bonded to a silicon atom.
Two common organic precursors are tetraethyl orthosilicate (TEOS) and tetramethyl orthosilicate (TMOS). The latter is more toxic than the former.
Tetraethyl orthosilicate (TEOS), Si(OC2H5)4, is the first alkoxide of the series, followed by tetramethyl orthosilicate (TMOS), Si(OCH3)4, which is, however, less safe to handle and hydrolyzes faster than TEOS.
The hydrolysis of TMOS is, in fact, around six times faster: in general, a lower hydrolysis rate is associated with an increase of the organic group size in the silicon alkoxide. The properties of the silicon alkoxides change according to the dimension of the alkoxy; larger groups produce an increase in molecular weight, viscosity, and boiling point and a decrease in density of the alkoxides.
As a rule of thumb, a larger size of the alkoxy group is associated with a lower hydrolysis rate due to the steric hindrance. The reactivity follows the sequence, with tetramethyl orthosilicate the most reactive alkoxide:
tetramethyl orthosilicate >tetraethyl orthosilicate>tetra-n-propylorthosilicate>tetrabutyl orthosilicate
The Uses of Tetramethyl orthosilicate
Tetramethyl Orthosilicate is a compound used in the research of the multifunctionality of silicified nanoshells and the efficiency at adsorbing cadmium ions at cell interfaces.
Properties of Tetramethyl orthosilicate
Melting point: | −4 °C(lit.) |
Boiling point: | 121-122 °C(lit.) |
Density | 1.023 g/mL at 25 °C(lit.) |
Flash point: | 84 °F |
storage temp. | Store below +30°C. |
form | liquid |
color | colorless |
Water Solubility | hydrolysis |
Sensitive | Moisture Sensitive |
Safety information for Tetramethyl orthosilicate
Signal word | Danger |
Pictogram(s) |
Flame Flammables GHS02 Corrosion Corrosives GHS05 Skull and Crossbones Acute Toxicity GHS06 |
GHS Hazard Statements |
H226:Flammable liquids H315:Skin corrosion/irritation H318:Serious eye damage/eye irritation H330:Acute toxicity,inhalation |
Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233:Keep container tightly closed. P280:Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for Tetramethyl orthosilicate
InChIKey | LFQCEHFDDXELDD-UHFFFAOYSA-N |
Abamectin manufacturer
Rivashaa Agrotech Biopharma Pvt. Ltd.
Tritech Catalyst and Intermediate Pvt Ltd
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