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Description
6,6'-Dibromoisoindigo is an organic semiconductor building block constructed on the isoindigo framework, a conjugated bisoxindole system that is inherently electron-deficient. The two bromine atoms at the 6 and 6' positions make this molecule ready for use in palladium-catalysed cross-coupling reactions to form both conjugated polymers and small molecules. In the laboratory, the compound serves as the acceptor unit in donor–acceptor material design, an approach that has become standard practice in the development of organic semiconductors for transistors, solar cells, and near-infrared light-absorbing materials.
The characteristic that makes isoindigo so highly valued is its strong acceptor behaviour combined with a planar, rigid framework. The two lactam carbonyl groups withdraw electron density, thereby lowering orbital energy levels and narrowing the band gap when the unit is combined with a donor unit. The planarity of the framework supports close interchain interaction, a condition that is important for charge-carrier transport in thin films. In addition, isoindigo is known for good chemical and thermal stability along with a relatively concise synthetic route. The bromo positions provide well-defined, symmetric reactive handles for controlled polymerisation and coupling.
In Indonesian laboratories, this building block is typically used by university and institutional research groups working on organic electronics and functional polymer materials. It is handled at milligram-to-gram scale in synthesis laboratories equipped for inert-atmosphere work, then passed on to thin-film fabrication and characterisation. Because it is a research-scale material, quantities are usually planned around a specific series of coupling experiments and stored between synthetic campaigns rather than consumed in bulk.
Laboratory Applications
Donor–acceptor conjugated polymer synthesis: the symmetric 6,6'-dibromo substitution provides two equivalent reactive sites for step-growth polymerisation with donor comonomers, giving controlled backbone regularity.
Palladium-catalysed cross-coupling chemistry: the aryl bromide positions are well suited to Suzuki, Stille, and related couplings routinely used to assemble extended conjugated systems in the laboratory.
Organic field-effect transistor material development: the planar, rigid isoindigo core promotes close interchain packing in thin films, the structural condition required for efficient charge-carrier transport.
Organic photovoltaic material design: incorporating this strong acceptor unit lowers frontier orbital energy levels and narrows the band gap, tuning light absorption for solar cell active layers.
Near-infrared absorbing material research: the electron-deficient bisoxindole framework allows band gap narrowing far enough to reach absorption in the near-infrared region for optoelectronic and sensing studies.
Specifications
Brand: TCI
CAS number: 1147124-21-7
Product code: D5738
Chemical name: 6,6'-Dibromoisoindigo
Category: Materials Science > Material Building Blocks > Polymer/Macromolecule Semiconductor Building Blocks
Pack sizes: research-scale packs as listed by the manufacturer; please confirm the available pack size when ordering
Storage: keep in the original tightly closed container, protected from light and moisture, in accordance with the manufacturer's documentation
Handling and Storage
Store the material in its original tightly closed container in a cool, dry, well-ventilated area, protected from light and moisture, following the storage conditions stated in the manufacturer's documentation and safety data sheet. Amber glass vials or the supplied container are appropriate for keeping the solid; transfer to a secondary sealed container if the original is opened frequently. Because brominated conjugated building blocks are typically used in inert-atmosphere chemistry, weighing and transfer are best carried out in a glove box or under a nitrogen or argon stream to limit exposure to air and humidity. Handle the fine solid in a fume hood, wear safety glasses, nitrile gloves, and a laboratory coat, avoid dust generation and inhalation, and keep the material separate from strong oxidising agents. Consult the safety data sheet before use and dispose of residues and contaminated consumables through the laboratory's chemical waste route.
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