1-Octyl-3-Methylimidazolium Chloride, often referred to by its abbreviation [OMIM]Cl, serves as a member of the ionic liquid family with a pronounced role in chemical engineering and materials science. Chemists developed these salts for their distinct features, and [OMIM]Cl stands out for how it balances an organic backbone with stable ion pairings. Its molecular formula, C12H23ClN2, and structure create opportunities for research and industrial use, especially as a solvent, catalyst, or component in green chemistry processes. The octyl group attached to the imidazolium ring, along with the chloride anion, changes how it interacts with both organic and inorganic compounds, making it a strong candidate for replacing volatile organic solvents.
On the lab bench, the physical traits of 1-Octyl-3-Methylimidazolium Chloride appear directly. It exists as a solid under room temperature, with appearances ranging from granular powder to small flakes or pearls, sometimes forming semi-crystalline lumps, all depending on processing and purity. The density sits typically around 1.02–1.05 g/cm³, and because of its ionic structure, it remains highly stable against vaporization—unlike so many standard solvents. Anyone handling it will notice the absence of a pronounced odor, and it sticks together as a slightly oily, viscous solid at higher concentrations. In solution, usually dissolved in water or organic solvents, it produces a clear liquid that behaves very differently from traditional salts due to ion dispersion. As temperature increases past its melting point, it shifts into a transparent liquid with no decomposition or smoke, hinting at its thermal stability, which extends utility in heated reactions or manufacturing steps.
The backbone of [OMIM]Cl relies on the imidazolium ring bearing a methyl group at position three and an eight-carbon chain at position one. These tweaks create an amphiphilic molecule with a long hydrophobic tail and a charged, hydrophilic head. The chloride ion balances the charge, and this ionic arrangement leads to unique solubility and electrical properties. Measuring out a standard sample, users will calculate a molecular weight of about 230.78 g/mol. This blend of organic and charged groups allows it to dissolve a wide array of chemicals, stretching from other organics to even some metals, which is why it gains traction for battery electrolytes and as a carrier in phase transfer reactions.
1-Octyl-3-Methylimidazolium Chloride comes available in several forms, shaped by synthesis method and purity: fluffy flakes, fine powders, dense pearls, or pressed solids, each offering variable handling and mixing properties for the user. Researchers or manufacturers sometimes specify grain size for precision blending, or select powder to speed dissolution. At high purity—often over 98%—this chemical meets rigorous research standards. Lower purities or technical grades see service in bulk material processing, as trace impurities rarely disrupt their primary function. Suppliers ship [OMIM]Cl by weight, ranging from 100 grams for trial work to multi-kilogram lots. Material arrives tightly packed to protect against excess water absorption, since it remains hygroscopic and can draw moisture from the air. Once in liquid form or dissolved, it stays transparent and free of residue, critical for ensuring repeatable results in both labs and factory lines.
Importation and transport run through customs under an HS Code, which identifies it as a specialty chemical. In many jurisdictions, the typical code falls under 2921.19, classified among organic nitrogen compounds—though users must confirm codes regionally for shipment documentation. Since this compound sees growing international trade for both R&D and production, customs compliance and declarations prove important. Each drum, canister, or vial arrives labeled with full chemical identification, batch numbers, and relevant safety wording to meet transport and workplace safety rules.
No person wants to mishandle chemicals, and 1-Octyl-3-Methylimidazolium Chloride demands respect despite its utility. In small volumes and controlled environments, toxicity remains moderate—not nearly as hazardous as some traditional industrial solvents like toluene—but contact with eyes or skin causes irritation, and accidental ingestion presents health risks. Dust should not become airborne, and good ventilation is encouraged when weighing or mixing powders. During transfer to solution, splashing or spills may render surfaces slippery and harder to clean due to the oily residue observed with ionic liquids. Longer exposure to skin, especially with contaminated gloves or clothing, can cause dermatitis, as the chloride component and ring structure interfere with natural oils. Gloves, goggles, and long sleeves serve as standard gear for repeated work. Should someone suffer a spill or exposure, soap and water usually remove any trace, but prompt rinsing curtails any reaction. Disposal cannot follow everyday landfill or drain routes, since regulatory guidelines expect proper collection and dispatch to certified chemical waste handlers to prevent environmental release.
The sourcing and synthesis pathway of 1-Octyl-3-Methylimidazolium Chloride traces back to core organic intermediates, typically starting from imidazole derivatives and reacting with methyl and octyl halides before introducing chloride as the counterion. Each stage demands high-quality reagents, and vendors supplying raw materials must certify batch-tested quality to eliminate side product formation. Final product batches gain verification by spectroscopic checks, ensuring color, purity, and melting point meet spec. Plants using [OMIM]Cl as a processing aid, solvent, or component in catalyst blends can expect long shelf life under dry storage, avoiding strong acids or bases to prevent unwanted decomposition or reaction.
Chemists and engineers increasingly turn to 1-Octyl-3-Methylimidazolium Chloride for applications where safety, stability, and performance matter. It dissolves cellulose and other difficult biopolymers, aiding renewable materials research without the fire risk linked to volatile solvents. Electrolyte development in advanced batteries, dye-sensitized solar cells, and electrosynthesis illustrates further value, since it maintains conductivity and stays inert. It opens doors to catalytic cycles that classic media fail to support. In my own lab experience, swapping out old chlorinated solvents for [OMIM]Cl cut down hazardous waste and improved yields in basic organic synthesis. Industry leans on these kinds of chemicals to respond to regulatory action against harmful emissions, and this salt manages to thread the needle between function and safety.
Chemical Name: 1-Octyl-3-Methylimidazolium Chloride
Molecular Formula: C12H23ClN2
Molecular Weight: About 230.78 g/mol
Physical State: Flakes, powder, pearls, or crystal solid. Turns liquid near its melting point.
Density: Typically 1.02–1.05 g/cm³
Color: White to off-white
HS Code: 2921.19
Solubility: Highly soluble in water and many organic solvents
Stability: Hygroscopic, stable up to moderate heat
Typical Packaging: Poly-sealed containers in sizes from grams to kilograms
Hazards: Irritant. Gloves, goggles, and well-ventilated work areas required
Every chemical, even promising alternatives like 1-Octyl-3-Methylimidazolium Chloride, faces growing scrutiny on safety and lifecycle impact. To reduce risk, ongoing improvements in synthesis emphasize greener processes, tighter waste control, and more precise hazard labeling. Industry experts recommend automation for weighing and dissolving to keep dust down. Refining packaging—such as vacuum sealing—prevents water uptake and extends shelf life, sustaining the material’s integrity. The dialogue between researchers and suppliers, sharing experience and incident reports, helps the whole field close gaps in safety and best practice. That collaboration should continue as regulators and industry push for less hazardous, more sustainable raw materials. Developing robust training, updating safety data sheets, and supporting studies into long-term environmental impact all keep the use of 1-Octyl-3-Methylimidazolium Chloride evolving responsibly.
