Chemical Identity and Physicochemical Properties

1,2-Bis(2,3,4,5,6-pentabromophenyl)ethane (DBDPE; CAS 84852-53-9) is a fully brominated aromatic compound consisting of two pentabromophenyl rings connected by an ethane bridge. Its molecular formula is C₁₄H₄Br₁₀ and its molecular weight is approximately 971.22 g/mol. The compound contains ten bromine atoms per molecule, yielding a bromine content of approximately 82% by weight.

The compound appears as a white to off-white crystalline powder under ambient conditions. It is practically insoluble in water and only sparingly soluble in common organic solvents such as acetone, toluene, and dichloromethane. Its high degree of bromination and symmetric structure confer exceptional thermal stability; the decomposition onset temperature is reported to exceed 300 °C, making it compatible with the elevated processing temperatures required for engineering thermoplastics such as high-impact polystyrene (HIPS), acrylonitrile-butadiene-styrene (ABS), and polyolefins.

Unlike its structural analogue decabromodiphenyl ether (DecaBDE), DBDPE lacks an ether linkage, which contributes to its improved photostability and reduced tendency toward debromination under UV exposure—properties that are advantageous in outdoor or UV-exposed polymer applications.

Flame-Retardant Mechanism and Research Applications

DBDPE functions primarily as an additive flame retardant acting via a vapor-phase free-radical quenching mechanism. During combustion, thermal decomposition of the compound releases hydrobromic acid (HBr) into the gas phase. HBr acts as a radical scavenger by reacting with highly reactive hydroxyl (HO•) and hydrogen (H•) radicals that propagate the combustion chain reaction, thereby interrupting the flame and reducing heat release rate.

Because DBDPE is an additive rather than a reactive flame retardant, it is physically blended into the polymer matrix without forming covalent bonds with the host material. This simplifies formulation but requires attention to loading levels, compatibility, and potential migration or blooming over time. It is typically used in conjunction with antimony trioxide (Sb₂O₃) as a synergist, which enhances flame-retardant efficiency through formation of antimony oxyhalide intermediates.

Research applications of DBDPE include: evaluation of flame-retardant efficacy in thermoplastic and thermoset polymer systems; investigation of thermal degradation pathways and decomposition kinetics; studies of environmental fate, bioaccumulation potential, and analytical method development for regulatory compliance; and synthesis or benchmarking work in the development of next-generation halogen-free flame retardants.

Safe Handling, Storage, and Exposure Control

Personal Protective Equipment (PPE): When handling DBDPE powder, researchers should wear appropriate PPE including a NIOSH-approved dust respirator (minimum P100 rating), chemical-splash safety goggles, a laboratory coat, and chemical-resistant gloves (nitrile or neoprene recommended). Inhalation of fine dust should be strictly avoided; all weighing and transfer operations should be performed inside a fume hood or a well-ventilated enclosure.

Engineering Controls: Use local exhaust ventilation when handling bulk quantities. Avoid generating dust. Keep containers tightly closed when not in use to prevent moisture uptake and airborne dispersal.

Storage: Store in a cool (15–25 °C), dry, well-ventilated area away from strong oxidizing agents, heat sources, and direct sunlight. Keep in the original, tightly sealed container. Segregate from food, beverages, and incompatible materials. DBDPE is stable under recommended storage conditions and does not require refrigeration.

Spill and Waste Disposal: In the event of a spill, prevent dust formation, avoid inhalation, and collect the material using non-sparking tools into a sealed container for disposal. Dispose of DBDPE and contaminated materials in accordance with local, national, and international regulations governing halogenated organic waste. Do not dispose via drain or municipal waste streams.

First Aid: If inhaled, remove the affected individual to fresh air and seek medical attention if symptoms persist. If skin or eye contact occurs, flush thoroughly with water for at least 15 minutes and consult a physician. Refer to the product Safety Data Sheet (SDS) for complete hazard and first-aid information.

Regulatory Status and Environmental Considerations

DBDPE was developed in part as a commercial alternative to decabromodiphenyl ether (DecaBDE), which is subject to severe use restrictions under the Stockholm Convention on Persistent Organic Pollutants (POPs) and the European Union's REACH regulation. DBDPE itself is not currently listed as a Stockholm Convention POP substance; however, researchers and procurement personnel should verify the current regulatory status applicable to their jurisdiction before purchase and use, as regulatory landscapes for brominated flame retardants continue to evolve.

Under the EU RoHS Directive (Restriction of Hazardous Substances in Electrical and Electronic Equipment), DBDPE is not included in the restricted substance list as of the time of writing; however, its use in consumer electronics applications should be reviewed against current directive annexes. In the United States, DBDPE is subject to TSCA (Toxic Substances Control Act) reporting requirements, and users should consult the current TSCA inventory status.

Environmentally, DBDPE is highly lipophilic (high log K_ow) and poorly water-soluble, raising concerns about potential persistence and bioaccumulation in aquatic and terrestrial ecosystems. While published data suggest lower environmental mobility compared with DecaBDE, the environmental fate of DBDPE and its debromination products remains an active area of scientific investigation. Researchers conducting environmental or ecotoxicological studies should consult the current peer-reviewed literature and relevant regulatory agency risk assessments.

All users are advised to consult the current product Safety Data Sheet (SDS) and applicable national chemical regulations prior to use.

Ordering Information and Quality Specifications

Aladdin Scientific supplies 1,2-Bis(2,3,4,5,6-pentabromophenyl)ethane under SKU B107579. Researchers should confirm purity grade, lot-specific certificate of analysis (CoA), and available pack sizes at the time of order to ensure suitability for their specific application.

When specifying this reagent for procurement, the following identifiers are recommended to avoid ambiguity:

• IUPAC Name: 1,2-bis(2,3,4,5,6-pentabromophenyl)ethane
• CAS Number: 84852-53-9
• Molecular Formula: C₁₄H₄Br₁₀
• Common Synonyms: DBDPE; decabromodiphenylethane; bis(pentabromophenyl)ethane
• Aladdin SKU: B107579

For technical inquiries regarding product specifications, compatibility with specific polymer systems, or bulk availability, contact Aladdin Scientific technical support. All products are supplied with a Safety Data Sheet; please request the SDS prior to first use and ensure all laboratory personnel have reviewed it.