Fluorescent Properties of Morin in Aqueous Solution: A Conversion from Aggregation Causing Quenching (ACQ) to Aggregation Induced Emission Enhancement (AIEE) by Polyethyleneimine Assembly.,Macromolecular Rapid Communications

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Fluorescent Properties of Morin in Aqueous Solution: A Conversion from Aggregation Causing Quenching (ACQ) to Aggregation Induced Emission Enhancement (AIEE) by Polyethyleneimine Assembly.
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-06-11 , DOI: 10.1002/marc.202000198
Xu Yu ₁ , Yan-Cai Gao ₁ , Hong-Wei Li ₁ , Yuqing Wu ₁

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Unlike normal conversion from aggregation caused quenching (ACQ) to aggregation induced emission enhancement (AIEE) by introducing aromatic rotors tuning aggregation modes, in this study, it is achieved through a supramolecular assembly with polymer. Thus, it provides an easy approach for the inhibition of unwanted H‐aggregation between luminogens. As a kind of flavonoid, morin has shown great potential in therapeutics. However, its poor solubility and weak emission in aqueous solution greatly limit its bioapplications. When morin is dissolved in aqueous solution, the presence of 30 × 10⁻⁶ m polyethyleneimine (PEI) induces significant emission enhancement and bathochromic shift. Consequently, the quantum yield (QY) of 24.5% is either achieved by assembling with PEI, versus 0.76% of its ACQ state composed of H‐aggregation in aqueous solution. Particularly, the in‐depth mechanism studies reveal that it is the assembly with PEI that disassociates the H‐aggregation in aqueous solution and further restricts the stretching and/or rotation of morin, which eventually reduce the nonradiative decays and enhance the emission. Therefore, the present study reports a unique phenomenon of AIEE effects on morin. Particularly the in‐depth investigation on intrinsic mechanisms will highlight and greatly expand the development of more luminogens from traditional Chinese herbals.

中文翻译：

水溶液中Morin的荧光性质：聚乙烯亚胺组装从聚集引起的猝灭（ACQ）转变为聚集诱导的发射增强（AIEE）。

通过引入调节聚合模式的芳族转子，不同于从聚集引起的猝灭（ACQ）正常转变为聚集诱导的发射增强（AIEE），在这项研究中，这是通过与聚合物的超分子组装实现的。因此，它为抑制发光剂之间不必要的H聚集提供了一种简便的方法。作为一种类黄酮，香rin素在治疗中显示出巨大的潜力。但是，它的不良溶解性和在水溶液中的微弱发射极大地限制了其生物应用。当morin溶于水溶液时，存在30×10 ^-6 m聚乙烯亚胺（PEI）引起显着的发射增强和红移。因此，通过与PEI组装可实现24.5％的量子产率（QY），而水溶液中H聚集构成的ACQ状态的量子产率仅为0.76％。特别是，深入的机理研究表明，与PEI形成的组装使水溶液中的H聚集解离，并进一步限制了茉莉花的拉伸和/或旋转，最终减少了非辐射衰变并增强了发射。因此，本研究报告了AIEE对香豆素的独特现象。特别是对内在机理的深入研究将突出并极大地扩展传统中草药中更多发光剂的开发。

更新日期：2020-07-20

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