Chemical Identity and Structure

1,12-Bis((1-methylbenzimidazolium)-3-yl)dodecane dibromide belongs to the gemini (dimeric) surfactant family, in which two cationic benzimidazolium head groups are covalently tethered through a flexible C12 methylene spacer. Each head group carries an N-methyl substituent at position 1, while the bridging nitrogen at position 3 is quaternized by the dodecyl chain, generating the permanent positive charge. The two bromide anions serve as exchangeable counter-ions, enabling convenient anion metathesis to tailor solubility and reactivity. The extended alkyl spacer promotes strong hydrophobic interactions, which underpins the compound's surface-active and membrane-disruptive properties relevant to biological and materials research.

Handling, Safety, and Storage

As a quaternary ammonium-type salt, this compound should be handled with standard laboratory precautions. Wear appropriate personal protective equipment including nitrile gloves, safety glasses, and a laboratory coat when weighing or preparing solutions. Avoid inhalation of dust and contact with skin or eyes. Work in a well-ventilated area or fume hood when handling powders.

Store the reagent in a tightly sealed container in a cool, dry location away from direct light and moisture. Because bromide salts can be hygroscopic, desiccant storage is recommended to maintain purity. Consult the Safety Data Sheet (SDS) supplied with the product for full hazard classification, first-aid measures, and disposal requirements before use.

Research Applications

Antimicrobial Research: Gemini bis-quaternary ammonium and bis-imidazolium compounds with C10–C14 spacers are well documented in the literature as potent membrane-active antimicrobial agents. The dicationic nature of this compound enables dual electrostatic interactions with negatively charged bacterial membranes, potentially leading to membrane disruption and cell death. Researchers investigating new classes of antimicrobial agents or studying structure–activity relationships of gemini surfactants will find this compound a useful model system.

N-Heterocyclic Carbene (NHC) Precursor: Benzimidazolium salts are classical precursors for NHC ligands widely used in organometallic catalysis. Treatment with a suitable base generates the free carbene at the C2 position, which can coordinate to transition metals to form NHC–metal complexes. The bis-benzimidazolium scaffold of this reagent makes it a candidate for synthesizing bidentate or bridging bis-NHC metal complexes relevant to catalysis and materials science.

Ionic Liquid and Supramolecular Chemistry: Bis-imidazolium and bis-benzimidazolium salts serve as building blocks for task-specific ionic liquids and supramolecular assemblies. Anion exchange (e.g., replacing Br⁻ with PF₆⁻ or NTf₂⁻) can convert this salt into a room-temperature ionic liquid or tune its solubility for specific applications.

Solution Preparation Protocol

1. Solubility: This salt is expected to be soluble in polar protic solvents such as water and methanol, and in polar aprotic solvents such as DMSO and DMF, consistent with the general behavior of gemini benzimidazolium dibromide salts. Verify solubility empirically for your specific application and concentration.

2. Weighing: Allow the sealed container to equilibrate to room temperature before opening to prevent moisture condensation. Tare a suitable vessel and weigh the required amount of compound rapidly to minimize atmospheric exposure.

3. Dissolution: Add the appropriate solvent gradually to the weighed solid with stirring or gentle sonication until complete dissolution is achieved. For aqueous solutions, use deionized or Milli-Q water.

4. Filtration and storage of stock solutions: Filter through a 0.22 µm syringe filter if sterile solutions are required. Prepare fresh solutions where possible; if stock solutions must be stored, keep them refrigerated (2–8 °C) in tightly capped vials protected from light.

Quality, Purity, and Ordering Information

Aladdin Scientific supplies 1,12-Bis((1-methylbenzimidazolium)-3-yl)dodecane dibromide under SKU B469961, referenced against Sigma catalog number 762776. Researchers and procurement teams should specify the SKU when ordering to ensure the correct specification is received. For questions regarding certificate of analysis (CoA), purity specification, available pack sizes, bulk pricing, or custom synthesis inquiries, please contact Aladdin Scientific customer support. Always request and review the CoA for lot-specific purity data before use in critical experiments.