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Alternating donor–acceptor indigo-cyclopentadithiophene copolymers: competition between excited state conformational relaxation, energy transfer and excited state proton transfer†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2017-11-30 00:00:00 , DOI: 10.1039/c7qm00439g João Pina 1, 2, 3, 4 , Mohamed Alnady 1, 2, 3, 4 , Anika Eckert 5, 6, 6, 7, 8 , Ullrich Scherf 5, 6, 6, 7, 8 , J. Sérgio Seixas de Melo 1, 2, 3, 4
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2017-11-30 00:00:00 , DOI: 10.1039/c7qm00439g João Pina 1, 2, 3, 4 , Mohamed Alnady 1, 2, 3, 4 , Anika Eckert 5, 6, 6, 7, 8 , Ullrich Scherf 5, 6, 6, 7, 8 , J. Sérgio Seixas de Melo 1, 2, 3, 4
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A comprehensive characterization of the electronic excited states of an alternating donor–acceptor indigo-[didodecyl-cyclopentadithiophene] copolymer (IndC12CPDT) together with a model compound (with one indigo unit and two C12CPDT units) was undertaken. The two chromophoric units of the copolymer, indigo and C12CPDT, were independently investigated. The study encompasses qualitative absorption, fluorescence, phosphorescence emission and transient singlet–singlet and triplet–singlet difference spectra, together with quantitative measurements of quantum yields and lifetimes. The excited state dynamics of the trimeric model compound and copolymer was investigated in solution and in the solid state. Namely the competition of conformation relaxation processes with energy transfer/migration between the didodecyl-cyclopentadithiophene moiety (donor) and indigo (acceptor) units, together with the occurrence of fast excited state proton transfer (ESPT, from the N–H to the C![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
O group of indigo units), was observed. Our results demonstrate that ESPT and intrachain energy transfer are competitive processes in the IndC12CPDT copolymer excited state both in solution and in the solid state while conformational relaxation was found to be absent.
中文翻译：
交替供体-受体靛蓝环戊二烯共聚物：激发态构象放松，能量传递和激发态质子转移之间的竞争†
对交替的供体-受体靛蓝-[双十二烷基-环戊二噻吩]共聚物（IndC 12 CPDT）和模型化合物（具有一个靛蓝单元和两个C 12 CPDT单元）进行了电子激发态的全面表征。共聚物的两个发色单元，靛蓝和C 12CPDT，进行了独立调查。该研究涵盖了定性吸收，荧光，磷光发射和瞬态单重态-单重态和三重态-单重态的差异光谱，以及对量子产率和寿命的定量测量。在溶液和固态下研究了三聚体模型化合物和共聚物的激发态动力学。即，构象松弛过程与双十二烷基-环戊二噻吩部分（供体）和靛蓝（受体）单元之间的能量转移/迁移以及快速激发态质子转移（ESPT，从NH到CO ）之间的竞争。观察到一组靛蓝单元）。我们的结果表明，ESPT和链内能量转移是IndC 12中的竞争性过程CPDT共聚物在溶液和固态均处于激发态，而发现没有构象弛豫。
更新日期：2017-11-30
O group of indigo units), was observed. Our results demonstrate that ESPT and intrachain energy transfer are competitive processes in the IndC12CPDT copolymer excited state both in solution and in the solid state while conformational relaxation was found to be absent.
中文翻译：
交替供体-受体靛蓝环戊二烯共聚物：激发态构象放松，能量传递和激发态质子转移之间的竞争†
对交替的供体-受体靛蓝-[双十二烷基-环戊二噻吩]共聚物（IndC 12 CPDT）和模型化合物（具有一个靛蓝单元和两个C 12 CPDT单元）进行了电子激发态的全面表征。共聚物的两个发色单元，靛蓝和C 12CPDT，进行了独立调查。该研究涵盖了定性吸收，荧光，磷光发射和瞬态单重态-单重态和三重态-单重态的差异光谱，以及对量子产率和寿命的定量测量。在溶液和固态下研究了三聚体模型化合物和共聚物的激发态动力学。即，构象松弛过程与双十二烷基-环戊二噻吩部分（供体）和靛蓝（受体）单元之间的能量转移/迁移以及快速激发态质子转移（ESPT，从NH到C
O ）之间的竞争。观察到一组靛蓝单元）。我们的结果表明，ESPT和链内能量转移是IndC 12中的竞争性过程CPDT共聚物在溶液和固态均处于激发态，而发现没有构象弛豫。
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