Diketopyrrolopyrrole (DPP) and bisthiadiazole (BTDz)-based terpolymers were developed to obtain tunable optical properties and crystalline structures. Using dibromo-compounds of DPP and BTDz with distannylated thienylene vinylene (TV) moieties, high molecular weight polymers (44,100-99,200) with varied BTDz compositions (25, 50, or 75 mol%) were obtained. The introduction of BTDz generated a complementary light absorption band in the short-wavelength region (~550 nm), while the DPP units created an intramolecular charge transfer band at ~730 nm. As a result, terpolymers with a deep highest occupied molecular orbital energy of −5.50 eV and narrow bandgap of <1.5 eV were obtained. In addition, the crystal orientation of the DPP-based polymer was changed from edge-on to face-on by copolymerizing with only 25 mol% BTDz units.

中文翻译：

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使用双噻二唑单元调节二酮吡咯并吡咯基聚合物的光吸收和晶体结构的终端化方法

开发了基于二酮吡咯并吡咯 (DPP) 和双噻二唑 (BTDz) 的三元共聚物，以获得可调的光学特性和晶体结构。使用 DPP 和 BTDz 的二溴化合物与二甲基亚苯基亚乙烯基 (TV) 部分，获得了具有不同 BTDz 组成（25、50 或 75 mol%）的高分子量聚合物（44,100-99,200）。BTDz 的引入在短波长区域（~550 nm）产生了一个互补的光吸收带，而 DPP 单元在~730 nm 处产生了一个分子内电荷转移带。结果，获得了具有-5.50 eV的深最高占据分子轨道能量和<1.5 eV的窄带隙的三元共聚物。此外，通过与仅 25 mol% BTDz 单元共聚，DPP 基聚合物的晶体取向从侧向变为正面。