Octadecyltrimethoxysilane

Octadecyltrimethoxysilane
Names
Preferred IUPAC name
Octadecyltrimethoxysilane
Systematic IUPAC name
Trimethoxy(octadecyl)silane
Other names
n-Octadecyltrimethoxysilane
Trimethoxyoctadecylsilane
Identifiers
Abbreviations OTMS
5791830
3069-42-9 Yes
ChemSpider 68956 Yes
EC number 221-339-2
Jmol-3D images Image
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MeSH n-Octadecyltrimethoxysilane
PubChem 76486
Properties
Molecular formula
 C21H46O3Si
Molar mass 374.67 g·mol−1
Appearance Colorless liquid
Density 0.883 g cm−3
Melting point 16 °C (61 °F; 289 K)
Boiling point 170 °C (338 °F; 443 K)
1.438-1.44
Hazards
MSDS
EU classification Xi
R-phrases R36, R37, R38
S-phrases S26, S36
NFPA 704
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g., canola oil Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
1
2
0
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Octadecyltrimethoxysilane is an organosilicon compound, commonly called OTMS. This colourless liquid is used for preparing hydrophobic coatings and self-assembled monolayers. It is sensitive toward water, irreversibly degrading to a siloxane polymer.[1] It places a C18H39SiO3 "cap" on oxide surfaces. The formation of OTMS monolayers is used for converting hydrophilic surfaces to hydrophobic surfaces, e.g. for use in certain areas of nanotechnology and analytical chemistry.

References

  1. ↑ P. Fontaine and F. Rondelez, Kinetics of Polymerisation in Langmuir Monolayers of n-Alkyltrimethoxysilane, Short and Long Chains at Interfaces, Edited by: J. Daillant, P. Guenoun, C. Marques, P. Muller, J. Tran Thanh Van. 1995.

Further reading (specialized articles)