1-Octadecanethiol (CAS 2885-00-9) is a long-chain organic compound with a thiol group (-SH). It appears as a white to pale yellow crystalline solid or waxy substance at room temperature, with a faint sulfur-like odor. It has a melting point of around 30-33°C, so it can soften or melt in warm conditions. It is insoluble in water but dissolves well in organic solvents like ethanol, ether, and hexane. Its structure features an 18-carbon alkyl chain (CH₃(CH₂)₁₇-) attached to a thiol group, giving it both hydrophobic (water-repelling) and reactive properties due to the -SH group.
What is the formula for Octadecanethiol?
The chemical formula of 1-octadecanethiol is C₁₈H₃₈S. Its structure is often written as CH₃(CH₂)₁₇SH, where the long 18-carbon chain is linked to a thiol group (-SH) at one end.
Applications
- Surface Modification in Nanotechnology: Its thiol group strongly binds to metals like gold, silver, and copper. This makes it ideal for coating metal nanoparticles or surfaces, forming a protective "monolayer" (a single layer of molecules). This layer changes the surface properties-for example, making gold nanoparticles water-repellent or improving their stability in solutions. Such modified surfaces are used in sensors, electronics, and medical diagnostics.
- Lubricant Additives: The long carbon chain helps reduce friction between metal surfaces. It is added to lubricants for machinery or precision instruments, forming a slippery layer that prevents wear and tear. This is especially useful in high-pressure or high-temperature equipment where smooth movement is critical.
- Cosmetics and Personal Care: In some hair and skin products, it acts as a conditioning agent. The hydrophobic chain coats hair or skin, locking in moisture and adding softness. It can also help stabilize formulations by improving the mix of oil and water-based ingredients.
- Organic Synthesis: It serves as a building block in making other chemicals. For example, it can react with other compounds to form thiol-derived polymers or surfactants, used in specialty coatings or industrial detergents.
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