3,3',4,4'-Tetrabromobiphenyl: Properties, Uses & Safety

3,3',4,4'-Tetrabromobiphenyl is a fully characterized, halogenated aromatic compound widely employed in research laboratories as a reference standard, environmental analytical standard, and chemical probe for studying the biological and toxicological effects of brominated biphenyl congeners.

Chemical Name

3,3',4,4'-Tetrabromobiphenyl

SKU

T1539773

Molecular Formula

C₁₂H₆Br₄

Compound Class

Brominated Biphenyl (PBB congener)

Primary Application

Reference standard for environmental analysis and toxicological research

Storage Condition

Store in a cool, dry, well-ventilated area away from light and incompatible materials

Regulatory Context

Polybrominated biphenyl (PBB) congener subject to environmental monitoring regulations in multiple jurisdictions

Chemical Identity and Physical Properties

3,3',4,4'-Tetrabromobiphenyl (CAS number to be confirmed; SKU T1539773) belongs to the polybrominated biphenyl (PBB) family of halogenated aromatic compounds. Its molecular formula is C₁₂H₆Br₄, consisting of a biphenyl backbone substituted with four bromine atoms at the 3, 3', 4, and 4' ring positions. This substitution pattern imparts a high degree of molecular symmetry and planarity, which is significant for its receptor-binding behavior and environmental persistence.

The compound appears as a white to off-white crystalline solid at room temperature. Like other highly brominated biphenyls, it exhibits low aqueous solubility and high lipophilicity, characteristics that underpin its tendency toward bioaccumulation in fatty tissues and environmental compartments. It is soluble in common organic solvents such as dichloromethane, chloroform, acetone, and dimethyl sulfoxide (DMSO), making it suitable for preparation of standard solutions used in chromatographic analysis.

Research Applications

3,3',4,4'-Tetrabromobiphenyl is primarily used in scientific research as an analytical reference standard and a biochemical tool. Its well-defined structure and high purity make it indispensable in the following areas:

• Environmental Analysis: Used as a certified or working reference standard for the quantification of PBB congeners in environmental matrices including soil, sediment, water, and biological tissue samples by gas chromatography–mass spectrometry (GC-MS) and high-resolution GC-MS methods.
• Toxicological and Mechanistic Research: The 3,3',4,4'-substitution pattern is structurally analogous to dioxin-like compounds and enables researchers to investigate aryl hydrocarbon receptor (AhR) activation pathways, enzyme induction, and related endocrine-disrupting mechanisms in vitro and in vivo.
• Method Development and Validation: Laboratories developing or validating analytical methods for PBB detection in food, feed, and environmental samples use this compound as a spiking standard to assess method accuracy, precision, and recovery.
• Structure–Activity Relationship (SAR) Studies: Chemists and toxicologists use congeners such as 3,3',4,4'-tetrabromobiphenyl to map relationships between halogen substitution pattern and biological activity, aiding the design of safer flame-retardant alternatives.

Handling, Storage, and Safety

As a member of the polybrominated biphenyl family, 3,3',4,4'-Tetrabromobiphenyl must be handled with appropriate precautions. Researchers should consult the current Safety Data Sheet (SDS) prior to use. General guidelines include:

• Personal Protective Equipment (PPE): Use chemical-resistant gloves, laboratory coat, and eye protection. Where aerosol or dust generation is possible, use a fume hood or respiratory protection.
• Storage: Store in a tightly sealed container in a cool, dry, well-ventilated area, protected from direct light and heat. Keep away from incompatible materials such as strong oxidizing agents.
• Waste Disposal: Dispose of waste in accordance with local, regional, and national environmental regulations for halogenated organic compounds. Do not dispose of via drain or general waste streams.
• Environmental Precautions: Prevent release to the environment. PBB compounds are persistent, bioaccumulative, and potentially toxic (PBT substances); strict containment procedures are recommended.

All safety information provided here is for general guidance only. Users must refer to the official SDS document supplied with the product for complete hazard information.

Regulatory and Environmental Context

Polybrominated biphenyls (PBBs) as a class have been subject to significant regulatory scrutiny globally due to their persistence, bioaccumulation potential, and toxic properties. Several key regulatory frameworks are relevant to researchers and procurement personnel working with 3,3',4,4'-Tetrabromobiphenyl:

• EU RoHS Directive: The Restriction of Hazardous Substances (RoHS) Directive restricts the use of PBBs in electrical and electronic equipment sold within the European Union. This drives demand for PBB reference standards in compliance testing laboratories.
• Stockholm Convention: While specific PBB congeners may fall under the purview of the Stockholm Convention on Persistent Organic Pollutants (POPs), researchers should verify the current listing status for individual congeners.
• REACH Regulation: Under the EU REACH framework, substances of very high concern (SVHC) including certain PBBs may be subject to authorization requirements. Importers and downstream users should confirm compliance obligations.
• Food and Feed Safety: Regulatory agencies including the European Food Safety Authority (EFSA) and national bodies monitor PBB residues in food and animal feed, creating ongoing need for validated analytical methods and high-quality reference standards.

Researchers are advised to stay current with applicable regulations in their jurisdiction, as the regulatory landscape for halogenated persistent organic pollutants continues to evolve.

Frequently asked questions

What is 3,3',4,4'-Tetrabromobiphenyl used for in the laboratory?

3,3',4,4'-Tetrabromobiphenyl (SKU T1539773) is primarily used as an analytical reference standard for the detection and quantification of polybrominated biphenyl (PBB) congeners in environmental, food, and biological samples by GC-MS. It is also used as a biochemical probe in toxicological research to investigate aryl hydrocarbon receptor (AhR) activation and related mechanisms.

In which solvents is 3,3',4,4'-Tetrabromobiphenyl soluble?

3,3',4,4'-Tetrabromobiphenyl is soluble in common organic solvents including dichloromethane, chloroform, acetone, and dimethyl sulfoxide (DMSO). It has very low solubility in water due to its high lipophilicity, which is consistent with its behavior as a persistent, bioaccumulative organic compound.

What safety precautions should be taken when handling 3,3',4,4'-Tetrabromobiphenyl?

Researchers should handle 3,3',4,4'-Tetrabromobiphenyl in a fume hood while wearing appropriate personal protective equipment, including chemical-resistant gloves, a laboratory coat, and safety goggles. The compound should be stored in a sealed container in a cool, dry, well-ventilated area away from incompatible materials and heat sources. Waste must be disposed of in accordance with local regulations for halogenated organic compounds. Always consult the current Safety Data Sheet (SDS) before use.

How should 3,3',4,4'-Tetrabromobiphenyl be stored to maintain stability?

To maintain the integrity and purity of 3,3',4,4'-Tetrabromobiphenyl, store the compound in a tightly sealed container under cool, dry, and dark conditions, away from direct sunlight, heat, and strong oxidizing agents. Following recommended storage conditions will help ensure the compound remains suitable for use as a reference standard over its shelf life.

References

1. Safe, S. H. Polychlorinated biphenyls (PCBs), dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), and related compounds: environmental and mechanistic considerations which support the development of toxic equivalency factors (TEFs). Critical Reviews in Toxicology, 1990.
2. European Parliament. Directive 2011/65/EU on the restriction of the use of certain hazardous substances in electrical and electronic equipment (RoHS recast). Official Journal of the European Union, 2011.
3. Stockholm Convention on Persistent Organic Pollutants. United Nations Environment Programme (UNEP), 2001.
4. European Chemicals Agency (ECHA). Guidance on REACH. Helsinki: ECHA, current edition.

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.