COTIC-4Cl

• CAT Number: M440149
• CAS Number: 2328092-51-7
• Molecular Formula: C75H78Cl4N4O4S4
• Molecular Weight: 1369.52
• Purity: 98.0%
• Synonyms: COTIC-4Cl, 2,2′-((2Z,2’Z)-(((4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b’]dithiophene-2,6-diyl)bis(4-(2-ethylhexyloxy)thiophene-5,2-diyl))bis(methanylylidene))bis(5,6-dichloro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile
• Solubility: Chloroform, chlorobenzene
• Appearance: Black deep-blue powder/crystals
• Storage: Room Temperature (Recommended in a cool and dark place)
• HOMO / LUMO: HOMO = -5.24 eV, LUMO = -4.02 eV, Eg, opt> = 0.99 eV

COTIC-4Cl is an ultra-narrow bandgap n-type semiconductor designed for next-generation organic optoelectronic devices. Its molecular structure features an electron-rich cyclopentadithiophene (CPDT) donor core, alkoxythienyl spacers, and two IC-2Cl terminal acceptor units. Compared to COTIC-4F, COTIC-4Cl exhibits extended near-infrared (NIR) absorption, spanning ~600–1400 nm, with a strong absorption band and an optical bandgap of ~1.0 eV. This makes it especially suitable for organic photodiodes requiring spectral response beyond 1000 nm. Ternary OPDs using PCE10:COTIC-4Cl:PC₇₁BM active layers have achieved a detectivity (D*) of 5 × 10¹² Jones and responsivity (R) of 0.30 A W⁻¹ at 1100 nm.