Ultrafast energy transfer from rigid, branched side-chains into a conjugated, alternating copolymer.
Ultrafast energy transfer from rigid, branched side-chains into a conjugated, alternating copolymer.
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DOI：
10.1063/1.4855156
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发表时间：
2014-01
期刊：
影响因子：
--
通讯作者：
G. Griffin;P. M. Lundin;B. Rolczynski;Alexander Linkin;Ryan D. McGillicuddy;Zhenan Bao;G. Engel
中科院分区：
文献类型：
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作者：
G. Griffin;P. M. Lundin;B. Rolczynski;Alexander Linkin;Ryan D. McGillicuddy;Zhenan Bao;G. Engel
我们提出了一个苯并二噻吩/噻吩交替共聚物的合成和表征装饰刚性，单支化侧链。我们的特点激子迁移和重组动力学在这些分子在四氢呋喃溶液中，使用静态和时间分辨光谱相结合。作为对照实验，我们还测量电子弛豫动力学在孤立的分子类似物的侧链和聚合物部分。我们采用半经验和时间依赖性密度泛函理论计算表明，光激发的装饰共聚物使用395 nm的激光脉冲的结果在激发态主要位于侧链上。我们使用超快瞬态吸收光谱表明，激发被转移到聚合物主链的速度比仪器响应函数，10250 fs。
We present the synthesis and characterization of a benzodithiophene/thiophene alternating copolymer decorated with rigid, singly branched pendant side chains. We characterize exciton migration and recombination dynamics in these molecules in tetrahydrofuran solution, using a combination of static and time-resolved spectroscopies. As control experiments, we also measure electronic relaxation dynamics in isolated molecular analogues of both the side chain and polymer moieties. We employ semi-empirical and time-dependent density functional theory calculations to show that photoexcitation of the decorated copolymer using 395 nm laser pulses results in excited states primarily localized on the pendant side chains. We use ultrafast transient absorption spectroscopy to show that excitations are transferred to the polymer backbone faster than the instrumental response function, ∼250 fs.