Octadecyltrimethoxysilane

Octadecyltrimethoxysilane
Names
Preferred IUPAC name
Octadecyltrimethoxysilane
Systematic IUPAC name
Trimethoxy(octadecyl)silane
Other names
n-Octadecyltrimethoxysilane
Trimethoxyoctadecylsilane
Identifiers
3D model (JSmol)
Abbreviations OTMS
5791830
ChemSpider
ECHA InfoCard 100.019.400
EC Number 221-339-2
MeSH n-Octadecyltrimethoxysilane
Properties
C21H46O3Si
Molar mass 374.68 g·mol−1
Appearance Colorless liquid
Density 0.883 g cm−3
Melting point 16 to 17 °C (61 to 63 °F; 289 to 290 K)
Boiling point 170 °C (338 °F; 443 K)
1.438-1.44
Hazards
Safety data sheet
Xi
R-phrases (outdated) R36, R37, R38
S-phrases (outdated) S26, S36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 oilHealth code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroformReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
1
2
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Octadecyltrimethoxysilane (OTMS) is an organosilicon compound. This colorless 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 (1995). J. Daillant, P. Guenoun, C. Marques, P. Muller, J. Tran Thanh Van, ed. Kinetics of Polymerisation in Langmuir Monolayers of n-Alkyltrimethoxysilane. Short and Long Chains at Interfaces.

Further reading

  • Hild, R; David, C; Müller, H. U; Völkel, B; Kayser, D. R; Grunze, M (1998). "Formation and Characterization of Self-assembled Monolayers of Octadecyltrimethoxysilane on Chromium:  Application in Low-Energy Electron Lithography". Langmuir. 14 (2): 342–346. doi:10.1021/la970438l.
  • Vidon, S; Leblanc, R. M (1998). "Langmuir Study of Octadecyltrimethoxysilane Behavior at the Air−Water Interface". The Journal of Physical Chemistry B. 102 (7): 1279–1286. doi:10.1021/jp973334s.
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