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Description
4,7-Dibromo-2,1,3-benzoselenadiazole is an organic semiconductor building block built around a benzoselenadiazole core carrying two bromine atoms at the 4 and 7 positions. In materials science laboratories, this compound serves as an electron-accepting unit that is ready to be polymerized or coupled in order to construct donor-acceptor systems. The two symmetrically placed bromo groups make it an ideal bifunctional monomer for cross-coupling reactions such as Stille, Suzuki, and direct C-H coupling, allowing researchers to assemble conjugated polymers with controlled, regularly repeating chain structures.
The key characteristic that leads researchers to select this material is the presence of a selenium atom in place of the sulfur found in the more common benzothiadiazole framework. The selenium atom is larger and more easily polarized, and it contributes stronger intermolecular interactions, so the resulting polymers tend to display a narrower band gap, absorption shifted toward longer wavelengths, and denser chain packing within thin films. These properties are highly sought after in organic solar cell and near-infrared detector research. The benzoselenadiazole core also retains the electron-deficient character needed for a reliable acceptor unit.
In Indonesian laboratories, this building block is typically used in university and institutional materials chemistry groups working on organic electronics, thin-film devices, and conjugated polymer synthesis. It is generally handled at the bench scale in synthesis laboratories equipped for inert-atmosphere cross-coupling work, and is commonly requested by research teams preparing donor-acceptor copolymers for photovoltaic and photodetector studies, as well as by groups characterizing optical and electronic properties of newly designed semiconducting materials.
Laboratory Applications
- Donor-acceptor copolymer synthesis: the symmetric dibromo substitution provides two reliable coupling sites, letting researchers alternate this acceptor unit with donor comonomers in a regular, repeating chain sequence.
- Stille cross-coupling: the aryl bromide positions react cleanly with organostannane partners, making this a standard monomer for building extended conjugated backbones under palladium catalysis.
- Suzuki cross-coupling: the same bromo groups pair with boronic acids and esters, giving materials chemists an alternative route to conjugated polymers and defined small-molecule segments.
- Direct C-H coupling polymerization: the compound can be coupled without prior stannylation or borylation, reducing synthetic steps for laboratories developing more streamlined polymer preparation routes.
- Organic solar cell and near-infrared detector materials research: the selenium-containing core narrows the band gap and red-shifts absorption, supporting devices that must harvest longer-wavelength light.
Specifications
- Brand: TCI
- CAS number: 63224-42-0
- Catalog number: D3944
- Category: Materials Science > Material Building Blocks > Polymer/Macromolecule Semiconductor Building Blocks
- Pack sizes: available in standard TCI research-scale packaging; please confirm the pack size required when ordering
- Storage note: store in a cool, dry, well-ventilated place, protected from light and kept tightly closed
Handling and Storage
Store the container tightly closed in a cool, dry, and well-ventilated area, away from direct sunlight, heat sources, and incompatible chemicals. Amber glass bottles or the original manufacturer container are suitable, and transferring under an inert atmosphere is advisable when the material will be used in moisture-sensitive cross-coupling reactions. Handle the compound inside a fume hood using gloves, safety glasses, and a laboratory coat, and avoid generating or inhaling dust during weighing. Keep the container clearly labelled, and always consult the manufacturer's safety data sheet before use and disposal.
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