Octadecyltrichlorosilane

Octadecyltrichlorosilane
Other names Trichlorooctadecylsilane Stearyltrichlorosilane
Identifiers
Abbreviations	ODTS
CAS number	112-04-9 Y
	EC number	203-930-7
Jmol-3D images	Image 1
SMILES CCCCCCCCCCCCCCCCCCSi(Cl)(Cl)Cl
Properties
Molecular formula	C18H37Cl3Si
Molar mass	387.93 g mol−1
Appearance	Colorless liquid
Density	0.984 g/mL, liquid
Boiling point	223 °C; 433 °F; 496 K (at 10 Torr)
Solubility	soluble in ether, THF, THP, hydrocarbons, tetrachloroethylene[1]
Hazards
EU classification	Corrosive (C)
S-phrases	S26 S27 S36 S37 S39
Main hazards	flammable, corrosive
NFPA 704	2 3 2
Related compounds
Related Chlorosilanes	Dodecyltrichlorosilane
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Octadecyltrichlorosilane (ODTS, or n-octadecyltrichlorosilane) is an organometallic chemical. It is used in semiconductor industry to form self-assembled monolayer thin films on silicon dioxide substrates. Its structural chemical formula is CH₃(CH₂)₁₇SiCl₃. It is flammable, reacts with water, and is also sensitive to air. It is corrosive and can severely damage mucous membranes. Its EINECS number is 203-930-7.

Octadecyltrichlorosilane is an amphiphilic molecule consisting of a long-chain alkyl group (C₁₈H₃₇–) and a polar head group (SiCl₃–), which forms Self assembled monolayers (SAMs) on various oxidic substrates.^[2]

ODTS finds its use in molecular electronics, as thin insulating gates in Metal-Insulator-Semiconductor Field-Effect Transistors.^[3]

Dodecyltrichlorosilane, an ODTS analog with shorter alkyl chain, is used for the same purpose as well.

ODTS-PVP films are used in organic-substrate LCD displays.^[4]

References