Excitation-Wavelength-Dependent Photophysics of a Torsionally Disordered Push–Pull Dye,The Journal of Physical Chemistry Letters

当前位置： X-MOL 学术 › J. Phys. Chem. Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Excitation-Wavelength-Dependent Photophysics of a Torsionally Disordered Push–Pull Dye
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2024-07-25 , DOI: 10.1021/acs.jpclett.4c01840
Ina Fureraj ₁ , Johannes Wega ₁ , Evangelos Balanikas ₁ , Khurnia Krisna Puji Pamungkas ₂ , Naomi Sakai ₂ , Stefan Matile ₂ , Eric Vauthey ₁

Affiliation

The torsional disorder of conjugated dyes in the electronic ground state can lead to inhomogeneous broadening of the S₁ ←S₀ absorption band, allowing for the selective photoexcitation of molecules with different amounts of distortion. Here, we investigate how this affects electronic transitions to upper excited states. We show that torsion of a core-alkynylated push–pull dye can have opposite effects on the oscillator strength of its lowest-energy transitions. Consequently, photoselection of planar and twisted molecules can be achieved by exciting in distinct absorption bands. Whereas this has limited effect in liquids due to fast planarization of the excited molecules, it strongly affects the overall photophysics in a polymeric environment, where torsional motion is hindered, allowing for the photoselection of molecules with different fluorescence quantum yields and intersystem-crossing dynamics.

中文翻译：

扭转无序推拉染料的激发波长相关光物理学

共轭染料在电子基态下的扭转无序可导致S ₁ ←S ₀吸收带的不均匀展宽，从而允许具有不同变形量的分子的选择性光激发。在这里，我们研究这如何影响电子跃迁到高激发态。我们表明，核心炔基化推拉染料的扭转对其最低能量跃迁的振荡器强度产生相反的影响。因此，平面和扭曲分子的光选择可以通过在不同的吸收带中激发来实现。虽然由于受激分子的快速平坦化，这在液体中的影响有限，但它强烈影响聚合环境中的整体光物理，其中扭转运动受到阻碍，从而允许对具有不同荧光量子产率和系间交叉动力学的分子进行光选择。

更新日期：2024-07-25

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南