Octadecanethiol Chemical Properties

Melting point:

30-33 °C(lit.)

Boiling point:

204-210 °C11 mm Hg(lit.)

Density 

0.847 g/mL at 25 °C(lit.)

vapor pressure 

<0.5 hPa (20 °C)

refractive index 

n20/D 1.3610

Flash point:

55 °F

storage temp. 

Store below +30°C.

form 

Crystalline Solid

pka

10.49±0.10(Predicted)

Specific Gravity

0.832 (30℃)0.847

color 

White

Water Solubility 

Insoluble

BRN 

1811934

Exposure limits

NIOSH: Ceiling 0.5 ppm(5.9 mg/m3)

Stability:

Stability Combustible. Stable. Incompatible with strong oxidizing agents, bases, reducing agents, alkali metals.

InChIKey

QJAOYSPHSNGHNC-UHFFFAOYSA-N

LogP

8 at 20℃

CAS DataBase Reference

2885-00-9(CAS DataBase Reference)

NIST Chemistry Reference

1-Octadecanethiol(2885-00-9)

EPA Substance Registry System

1-Octadecanethiol (2885-00-9)

Safety Information

Hazard Codes 

F,Xi

Risk Statements 

36/37/38

Safety Statements 

7-16-37/39-26-36

RIDADR 

UN 1170 3/PG 2

OEL

Ceiling: 0.5 ppm (5.9 mg/m3) [15-minute]

WGK Germany 

3

Autoignition Temperature

>200 °C

TSCA 

Yes

HS Code 

29309070

Toxicity

LD50 orally in Rabbit: > 5000 mg/kg LD50 dermal Rat > 2000 mg/kg

MSDS

• Language:English Provider:Octadecanethiol
• Language:English Provider:ACROS
• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

Octadecanethiol Usage And Synthesis

Chemical Properties

white powder with an extremely unpleasant smell

Uses

Organic intermediate, synthetic rubber processing.

Uses

1-Octadecanethiol (ODT) is used to deposit thiolated molecules onto the surface of gold substrates, such as SAMs on gold quartz crystal resonators, on the tip of atomic force microscope probes, capacitive sensors.

Uses

ODT is used in the surface modification of gold nanoparticle (AuNPs)/Nickel (Ni) foam conjugate for the preparation of a 3D surface enhanced Raman spectroscopy(SERS) substrate for the detection of organic pollutants. It may also be used enhance the superhydrophobic properties for different materials like nano-sized copper films, graphene and silica for different applications like mercury detection and electrochemical analysis.

General Description

1-Octadecanethiol (ODT) is a water soluble sulfur compound with an 18 carbon alkyl chain, which forms a strong hydrophobic assembly with transition metals, like gold .It forms self-assembled monolayers (SAMs) on the surface of such transition metals. The thiol membrane when covalently bonded with the surface of the metal electrode, it shows electrostriction phenomenon leading to variation in capacitance.ODT SAMs have a hydrophobic surface with contact angle of 102^oC.

Reactivity Profile

Octadecanethiol is non-flammable but combustible (Flash point >100°F and <140°F). Incompatible with oxidizing agents, strong acids and strong bases, alkali metals, and nitric acid. Can react with water, steam or acids to produce toxic and flammable vapors. Reacts violently with powerful oxidizing agents such as calcium hypochlorite(Ca(OCl)2) to generate SOx. Reacts with hydrides to form flammable H2 gas; reacts with halogenated hydrocarbons to yield HX. Reacts exothermically with aldehydes. Emits toxic compounds of sulfur when when heated to decomposition.

Hazard

Strong irritant.

Flammability and Explosibility

Not classified

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