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首页> 外文期刊>Crystal growth & design >Elucidating the Effects of Fluoro and Nitro Substituents on Halogen Bond Driven Assemblies of Pyridyl-Capped pi-Conjugated Molecules
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Elucidating the Effects of Fluoro and Nitro Substituents on Halogen Bond Driven Assemblies of Pyridyl-Capped pi-Conjugated Molecules

机译:阐明氟和硝基取代基对吡啶基封端的π-共轭分子的卤素键驱动组装的影响。

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摘要

Among recent advances toward efficient semiconducting materials, rational design guidelines have emerged focusing on the synergy between various intermolecular interactions to improve the solid-state order of pi-conjugated molecules in organic electronic devices. Herein, we focus our attention on halogen bonding (XB) interactions and the crucial role of electron withdrawing substituents (e.g., nitro and fluoro) toward influencing solid-state properties via secondary interactions. Employing iodoethynyl benzene derivatives (F(2)BAI and (NO2)(2)BAI) and thiophene/furan-based building blocks equipped with pyridyl groups as self assembling domains (PyrTF and PyrT(2)), co-crystals driven by XB and pi-stacking interactions were formed and studied. Spectroscopic and thermal analysis of 1:1 mixtures provide initial evidence of co-crystallization. X-ray crystallography affords the inherent solid-state packing motifs within each assembly. Computational studies support experimental observations, revealing the dominant interactions and contribution of each substituent group toward increasing the stability of the resulting assemblies.
机译:在朝向高效半导体材料的最新进展中,出现了合理的设计指南,重点关注各种分子间相互作用之间的协同作用,以改善有机电子器件中π共轭分子的固态顺序。在此,我们将注意力集中在卤素键(XB)相互作用以及吸电子取代基(例如硝基和氟)对通过次级相互作用影响固态性质的关键作用上。使用碘乙炔基苯衍生物(F(2)BAI和(NO2)(2)BAI)和配备吡啶基作为自组装结构域的噻吩/呋喃基砌块(PyrTF和PyrT(2)),由XB驱动共晶并进行了π-堆积相互作用的研究。 1:1混合物的光谱和热分析提供了共结晶的初步证据。 X射线晶体学在每个组件中提供了固有的固态堆积图案。计算研究支持实验观察,揭示了每个取代基的主要相互作用和对增加组装结果稳定性的贡献。

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