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Aggregation-induced enhanced emission of a carbazole derivative with asymmetric group

机译：聚集诱导的不对称咔唑衍生物的增强发射

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摘要

A novel carbazole-based compound (L) has been synthesized with an asymmetric group, which possesses obviously intramolecular charge transfer (ICT) process that was confirmed from the positive solvatochromic photophysical properties in different polar solvents. The introduction of nitro unit into L structure led the weak fluorescence emission, caused from the strong electron accepting character of nitro unit. L also demonstrated to exhibit superior aggregation-induced enhanced emission (AIEE) properties. The torsion degree between C1-C18 bond and N19-C23 bond was 94.098 degrees, the introduction of benzoimidazolylcarbazole attached to the carbazole core generated the torsion degree of the whole molecule, which prevented n-n stacking between adjacent molecules and brought about AIEE property. The results were verified by time dependent density functional theory (TD-DFT) calculations. The tortuosity of L molecule also brought about inferior planarity in whole molecule, then the molecules of L can organize through intermolecular interactions to form tiny crystals at nanosacle in water-medium solutions. The AIEE character of L was effectively applied in bioimaging of HepG2 cancer cells.
机译：合成了具有不对称基团的新型咔唑基化合物（L），该化合物具有明显的分子内电荷转移（ICT）过程，这已在不同极性溶剂中的正溶剂化光物理性质得到证实。将硝基单元引入L结构导致荧光弱的发射，这是由于硝基单元的强电子接受特性引起的。 L还显示出优异的聚集诱导增强发射（AIEE）特性。 C1-C18键和N19-C23键之间的扭转度为94.098度，苯并咪唑基咔唑引入到咔唑核上产生了整个分子的扭转度，从而阻止了相邻分子之间的n-n堆积并带来了AIEE性能。通过时变密度泛函理论（TD-DFT）计算验证了结果。 L分子的曲折性也使整个分子的平面性变差，然后L分子可以通过分子间的相互作用组织起来，从而在水介质溶液中的纳米sacle处形成微小的晶体。 L的AIEE特征被有效地应用于HepG2癌细胞的生物成像中。

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