3,3'-Dibromo-2,2'-bithiophene (CAS 51751-44-1) is a brominated bithiophene building block used to make semiconducting small molecules, oligothiophenes and polymers for organic electronics and optoelectronics. It is an isomer of 5,5'-dibromo-2,2'-bithiophene, and its bromide end groups make it well suited to straightforward coupling reactions. The material is a white-yellowish powder with a purity of >98% by 1H NMR in CDCl3.
Introducing alkyl or aryl groups at the 3-positions can extend conjugation or raise solubility, add new functionality that alters electronic and photophysical behaviour, and strongly influence crystallinity, which helps tune the morphology and microstructure of cast films. Swapping the bromines for fluorine or cyano groups makes the structure more electron deficient, which affects charge mobility, stability and overall OFET and OPV efficiency.
The compound is also a core starting material for fused ring systems such as dithienopyrroles (DTP), dithienosilole (DTS), dithienoselenophene (DTSe), dithienogermole (DTG) and spiro-cyclopentadithiophene (SCT).
- Synthesis of semiconducting molecules, oligothiophenes and polymers for organic electronic devices.
- Preparation of materials for organic field-effect transistors (OFETs).
- Development of donor and acceptor materials for organic solar cells and organic photovoltaics.
- Building block for OLED materials and low band gap polymers.
- Synthesis of materials for chemical sensors.
- Precursor for fused structures such as DTP, DTS, DTSe, DTG and SCT.
| Brand | Ossila |
|---|---|
| CAS number | 51751-44-1 |
| Molecular formula | C8H4Br2S2 |
| Purity | >98% (1H NMR in CDCl3) |
| Category | — |
| Pack sizes | 5 g, 10 g, 25 g |
| Physical form | White-yellowish powder |
| Storage | — |
- Product code: B941
- Molecular Weight: 324.06 g/mol
- Synonyms: 2,2'-Bi(3-bromothiophene)
- Melting Point: 99 °C
- Classification / Family: Bithiophene, semiconductor synthesis intermediates, low band gap polymers, OLED, OFETs, organic photovoltaics
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