Unraveling the structure and exciton coupling for multichromophoric merocyanine dye molecules.

Unraveling the structure and exciton coupling for multichromophoric merocyanine dye molecules.
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揭示多发色部花青染料分子的结构和激子耦合。

DOI:
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发表时间:
2017
期刊:
Physical Chemistry, Chemical Physics - PCCP
影响因子:
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通讯作者:
F. Würthner
F. Würthner
中科院分区:
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文献类型:
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作者:
Federico Koch;M. Stolte;André Zitzler;D. Bialas;Andreas F. Steinbacher;T. Brixner;F. Würthner

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在分子多生色团系中,生色团的相对取向是决定其结构与功能关系的关键因素。对于溶液中结构灵活的分子体系,用光谱观察来阐明可获得的发色团取向的相关影响是非常艰巨的任务。在这项研究中,我们通过研究一系列不同连接的多色团系统来解决这个问题,这些系统由高度偶极的merocyanine染料组成,它们的取代模式和连接到桥接苯环上的发色团数量系统地变化。将电光吸收(EOA)和紫外/可见光谱与密度泛函理论(DFT)和激子理论相结合,揭示了相互作用发色团的构象偏好,并使其光学性质合理化。我们的研究结果表明,对于所有的多色系,都存在一个相对的发色团方向,它通过指向相反的方向来补偿merocyanine染料的个别偶极矩。这些取向通过部分激子耦合亚基进一步合理化了观测到的光谱性质。
The relative orientation of chromophores is a key factor in determining the relationship between the structure and the functionality in molecular multichromophore ensembles. In the case of structurally flexible molecular systems in solution, the task to clarify the relevant effects of accessible chromophore orientations with spectroscopic observations is very demanding. In this study, we address this issue by investigating a series of differently connected multichromophoric systems composed of highly dipolar merocyanine dyes that are systematically varied in their substitution pattern and the number of chromophores attached to a bridging benzene ring. Combining electro-optical absorption (EOA) and UV/Vis spectroscopy with density functional theory (DFT) as well as exciton theory discloses conformational preferences and rationalizes the optical properties of the interacting chromophores. Our findings suggest for all multichromophoric systems there is a relative orientation of the chromophores which compensates for the individual dipole moments of the merocyanine dyes by pointing preferably in opposing directions. These orientations furthermore rationalize the observed spectral properties by partly excitonically-coupled subunits.
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