5,5'-Dibromo-2,2'-bithiophene (CAS 4805-22-5) is a 2,2'-bithiophene carrying bromine atoms at both 5-positions. It serves as a versatile starting material for making semiconducting small molecules, oligothiophenes and conjugated polymers used in OLEDs, OFETs and organic solar cells. The two bromine sites make it a key intermediate for C-C bond formation through Suzuki and Stille coupling.
Copolymerising it with a 9,9-dioctylfluorene diboronic ester gives F8T2, a wide band gap conjugated polymer used as a yellow emitter in OLEDs and as a donor blended with PCBMs in OPV devices. F8T2:ZnO nanoparticle photodetectors have reached an external quantum efficiency of 782% at 358 nm under 3 V forward bias.
Coupling with 7-dodecyl-9H-fluoren-2-boronic acid yields the p-channel semiconductor DDFTTF, which has shown mobility up to 0.39 cm2/Vs and an on/off ratio of 2 × 10^5 in OFETs, with water-stable performance suited to OTFT sensors detecting analytes at ppb levels. Ossila supplies this solid powder at >98% purity (1H NMR in CDCl3).
- Synthesis of semiconducting small molecules, oligothiophenes and conjugated polymers via Suzuki and Stille coupling.
- Preparation of the fluorene-bithiophene copolymer F8T2 for OLED emitters and OPV donor layers.
- Synthesis of the p-channel semiconductor DDFTTF for OFET devices.
- Development of water-stable OTFT chemical and biological sensors.
- Research on F8T2-based nanocomposite ultraviolet photodetectors.
| Brand | Ossila |
|---|---|
| CAS number | 4805-22-5 |
| Molecular formula | C8H4Br2S2 |
| Purity | >98% (1H NMR in CDCl3) |
| Category | — |
| Pack sizes | 5 g, 10 g, 25 g |
| Physical form | Solid powder |
| Storage | — |
- Product code: B921
- Molecular Weight: 324.06 g/mol
- Synonyms: 2,2'-Bi(5-bromothiophene)
- Classification / Family: Bithiophene, semiconductor synthesis intermediates, low band gap polymers, OLED, OFETs, organic photovoltaics
- Melting Point: 144.0 °C - 146.0 °C
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