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Synthesis, crystal structure, polymorphism and microscopic luminescence properties of anthracene derivative compounds.
Acta Crystallographica Section B ( IF 1.3 ) Pub Date : 2020-05-18 , DOI: 10.1107/s2052520620004424
Anna Moliterni 1 , Davide Altamura 1 , Rocco Lassandro 1 , Vincent Olieric 2 , Gianmarco Ferri 3 , Francesco Cardarelli 3 , Andrea Camposeo 4 , Dario Pisignano 4 , John E Anthony 5 , Cinzia Giannini 1
Affiliation  

Anthracene derivative compounds are currently investigated because of their unique physical properties (e.g. bright luminescence and emission tunability), which make them ideal candidates for advanced optoelectronic devices. Intermolecular interactions are the basis of the tunability of the optical and electronic properties of these compounds, whose prediction and exploitation benefit from knowledge of the crystal structure and the packing architecture. Polymorphism can occur due to the weak intermolecular interactions, requiring detailed structural analysis to clarify the origin of observed material property modifications. Here, two silylethyne‐substituted anthracene compounds are characterized by single‐crystal synchrotron X‐ray diffraction, identifying a new polymorph in the process. Additionally, laser confocal microscopy and fluorescence lifetime imaging microscopy confirm the results obtained by the X‐ray diffraction characterization, i.e. shifting the substituents towards the external benzene rings of the anthracene unit favours π–π interactions, impacting on both the morphology and the microscopic optical properties of the crystals. The compounds with more isolated anthracene units feature shorter lifetime and emission spectra, more similar to those of isolated molecules. The crystallographic study, supported by the optical investigation, sheds light on the influence of non‐covalent interactions on the crystal packing and luminescence properties of anthracene derivatives, providing a further step towards their efficient use as building blocks in active components of light sources and photonic networks.

中文翻译:

蒽衍生物化合物的合成,晶体结构,多态性和显微发光性质。

由于其独特的物理性能(例如,明亮的发光和发射可调性),使其成为先进光电器件的理想选择。分子间相互作用是这些化合物的光学和电子性质可调谐性的基础,其预测和开发受益于晶体结构和堆积结构的知识。由于分子间的相互作用较弱,可能会发生多态现象,因此需要进行详细的结构分析以阐明观察到的材料性能变化的起源。在此,通过单晶同步加速器X射线衍射表征了两个甲硅烷基乙炔取代的蒽化合物,从而确定了该过程中的新多晶型物。此外,激光共聚焦显微镜和荧光寿命成像显微镜还证实了通过X射线衍射表征获得的结果,即,将取代基移向蒽单元的外部苯环有利于π-π相互作用,从而影响晶体的形态和微观光学性质。具有更多孤立蒽单元的化合物具有较短的寿命和发射光谱,与孤立分子的相似性更高。晶体学研究得到光学研究的支持,阐明了非共价相互作用对蒽衍生物的晶体堆积和发光性能的影响,为将其有效用作光源和光子活性成分的基础又迈出了一步网络。
更新日期:2020-05-18
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