Thienothiophene, Thieno[3,2-b]thiophene
CAS Number 251-41-2
Chemistry Building Blocks, Heterocyclic Building Blocks, Monomers
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Thienothiophene, for the synthesis of small molecules and polymers
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Thieno[3,2-b]thiophene, also known as thienothiophene (TT), is a heterocyclic compound. It belongs to the family of fused thiophenes and is widely used as an intermediate for the synthesis of small molecules and polymers in the application of organic field-effect transistors (OFETs) and organic photovoltaic devices (OPV).
Fused thiophenes are more electron-rich and more structurally rigid, with extended π-conjugation so they are good candidates for adjusting the band gap of the organic polymer semiconducting materials, i.e. Poly[2,5-bis(3-hexadecylthiophen-2-yl)thieno[3,2-b]thiophene] (also known as PBTTT).
![pbttt synthesis with 2,5-bis(trimethylstannyl)thieno[3,2-b]thiophene and 5,5'-dibromo-4,4'-didodecyl-2,2'-bithiophene or 5,5'-dibromo-4,4'-dihexadecyl-2,2'-bithiophene or 5,5'-dibromo-4,4'-ditetradecyl-2,2'-bithiophene](http://cdn.shopify.com/s/files/1/0823/0287/files/pbttt-synthesis_636x148.jpg?6038470244592440286)
General Information
CAS Number | 251-41-2 |
Chemical Formula | C6H4S2 |
Molecular Weight | 140.23 g/mol |
Synonyms |
1,4-Dithiapentalene Thienothiophene |
Classification / Family | Thiophene, Fused thiophene, Dithiapentalene, Heterocylic aromatics, Five-membered ring, Semiconductor synthesis intermediates, Low band gap polymers OFETs, Organic Photovoltaics, Polymer solar cells |
Chemical Structure

Product Details
Purity | >95% |
Melting Point | 56 °C - 58 °C |
Appearance | White crystals |
MSDS Documentation
Thieno[3,2-b]thiophene MSDS sheet
Literature and Reviews
- Thienothiophenes, Dithienothiophenes, and Thienoacenes: Syntheses, Oligomers, Polymers, and Properties, M. E. Cinar et al., Chem. Rev., (2015), DOI: 10.1021/cr500271a
- A stable solution-processed polymer semiconductor with record high-mobility for printed transistors, Li et al., Sci. Reports, 2, 754, (2012) DOI: 10.1038/srep00754.
- Liquid-crystalline semiconducting polymers with high charge-carrier mobility, I. McCulloch et al., Nat. Mater., 5, 328 (2006)
To the best of our knowledge the information provided here is accurate. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. Products may have minor cosmetic differences (e.g. to the branding) compared to the photos on our website. All products are for laboratory and research and development use only.