Coexistence of Parallel and Rotary Stackings in the Lamellar Crystals of a Perylene Bisimide Dyad for Temperature-Sensitive Bicomponent Emission,The Journal of Physical Chemistry Letters

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Coexistence of Parallel and Rotary Stackings in the Lamellar Crystals of a Perylene Bisimide Dyad for Temperature-Sensitive Bicomponent Emission
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2021-03-30 , DOI: 10.1021/acs.jpclett.1c00674
Jiehuan Chen ₁ , Ningning Tang ₁ , Jiadong Zhou ₁ , Liangxuan Wang ₁ , Nianqiang Jiang ₁ , Nan Zheng ₁ , Linlin Liu ₁ , Zengqi Xie ₁

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Coexistence of rotationally π–π stacked columns and discrete slip-stacked dimers of perylene bisimide (PBI) chromophores is revealed by single crystal X-ray diffraction in the lamellar crystal of a head-to-tail linked PBI dyad. The rotary π–π stacked columnar moieties show H-type spectral character with relatively higher excitation energy, while the discrete slip-stacked π–π dimers have J-type spectral behavior with lower excitation energy. The lamellar crystals show relatively low photoluminescence efficiency of 12% at room temperature, while this dramatically increases to ∼90% at low temperature (80 K). Both of the rotary and slip-stacked moieties are emissive, and the nonradiative energy transfer processes between them are suppressed at low temperature, ensuring the highly efficient excimer-like long-lived fluorescence.

中文翻译：

sim双酰亚胺二元化合物层状晶体中平行和旋转堆积的共存，用于温度敏感的双组分发射

通过头对尾连接的PBI二元组的层状晶体中的单晶X射线衍射揭示了per-双酰亚胺（PBI）发色团的旋转π-π堆叠柱和离散的滑移堆叠二聚体的共存。旋转的π-π堆积的柱状部分显示出具有较高激发能量的H型光谱特征，而离散的滑移堆积的π-π二聚体具有较低的激发能量的J型光谱行为。层状晶体在室温下显示出相对较低的光致发光效率，为12％，而在低温（80 K）下则显着增加至约90％。旋转部分和滑动堆叠部分均是发射性的，并且它们之间的非辐射能量转移过程在低温下得到抑制，从而确保了高效的准分子样长寿命荧光。

更新日期：2021-04-08

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