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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Time dependent aggregation induced emission enhancement and the study of molecular packing in closely related azo-phenol BODIPY species
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Time dependent aggregation induced emission enhancement and the study of molecular packing in closely related azo-phenol BODIPY species

机译:时间依赖性聚集诱导发射增强和密切相关的偶氮酚BOBIPY物种中的分子包装研究

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摘要

Fluorescent azo-phenol BODIPYs (1-3) have been obtained by the substituent (-OCH3/-CH3) directed synthesis of ortho (L1) and para (L2-L3) azo-phenol aldehydes. These display aggregation caused quenching (ACQ, 1) and aggregation induced emission enhancement (AIEE, 2 and 3) depending on the position of azo relative to the phenolic hydroxyl group. An intriguing time dependent morphological transition from nanospheres to ordered nanorods and subsequent emission changes in AIEE active azo-phenol BODIPYs have been successfully realized by time dependent fluorescence, scanning electron (SEM), transmission electron (TEM) and fluorescence optical microscopy (FOM) studies. The existence of one-dimensional (1D) nanorods as ultimate species in these compounds (2-3) has been supported by crystal packing patterns. Diverse aggregated forms and hierarchical nanostructures have been related to variable extents of fluorescence enhancement. The plausible charge transfer process and its role in AIEE have been supported by DFT studies.
机译:通过取代基(-OOCH3 / -CH3)的邻羟(L1)和对苯酚醛的取代基(-OOCH3 / -CH3)获得荧光偶氮 - 苯酚BODIPYS(1-3)。这些显示聚集导致淬火(ACQ,1)和聚集诱导的发射增强(AIEE,2和3),取决于AZO相对于酚羟基的位置。通过时间依赖性荧光,扫描电子(SEM),透射电子(TEM)和荧光光学显微镜(FOM)研究,成功地实现了从纳米球到有序纳米棒与有序纳米棒和随后的发射变化的依赖于纳米球和随后的排放变化,扫描电子(SEM)和荧光光学显微镜(FOM)研究。通过晶体填料图案支撑在这些化合物(2-3)中作为最终物种的一维(1D)纳米棒的存在。不同的聚集形式和分层纳米结构与荧光增强的可变范围有关。 DFT研究支持了合理的费用转移过程及其在AIEE中的作用。

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