Ossila 4H-Cyclopenta[1,2-b:5,4-b']dithiophene B271

4H-Cyclopenta[1,2-b:5,4-b']dithiophene (CPDT, CAS 389-58-2) from Ossila is an off-white powder supplied at >99% purity. It serves as a cyclopentadithiophene building block and synthesis intermediate for semiconducting polymers used in organic field effect transistors (OFETs), organic photovoltaics and polymer solar cells.

Its rigid, coplanar fused-ring core promotes π−π stacking between molecules and is a good electron donor. The central five-membered ring can carry side chains, which helps tune solubility for solution processing, film morphology and polymer handling. CPDT is the precursor for 4,4'-alkyl-cyclopenta[2,1-b:3,4-b′]dithiophene, which can be prepared in aqueous solution.

Well-known CPDT-based materials include PCPDTBT, an alternating copolymer of CPDT and 2,1,3-benzothiadiazole that has reached power conversion efficiencies above 6%, and CPE-K, a conjugated polyelectrolyte used as a hole transporting layer in polymer/fullerene bulk heterojunction and perovskite solar cells as an alternative to PEDOT:PSS.

• Synthesis of low band-gap conjugated polymers with a cyclopentadithiophene backbone.
• Preparation of 4,4'-alkyl-cyclopenta[2,1-b:3,4-b′]dithiophene derivatives.
• Development of semiconducting materials for organic field effect transistors.
• Research on donor polymers such as PCPDTBT for polymer solar cells.
• Building CPDT-based hole transport materials such as CPE-K for perovskite and bulk heterojunction solar cells.

• Product code: B271
• M​olecular Weight: 178.27 g/mol
• Melting Point: 71.0 °C - 75.0 °C
• Synonym: CPDT; 4H-Cyclopenta[2,1-b:3,4-b']dithiophene

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