Color-tuning aggregation-induced emission of o -Carborane-bis(1,3,5-triaryl-2-pyrazoline) triads: Preparation and investigation of the photophysics
作者:Yi Chen、Jixi Guo、Xueyan Wu、Dianzeng Jia、Fenglian Tong
DOI:10.1016/j.dyepig.2017.09.011
日期:2018.1
Four D−A−D triads with an o-Carborane moiety as the electron acceptor and 1,3,5-triaryl-2-pyrazoline as the electron donor were designed and synthesized via a novel nickel-catalyzed cross-coupling reaction. The four triads exhibited aggregation-induced emission (AIE) attributes. The photophysical properties and crystal packing structures of these compounds were systematically investigated by UV-Vis
通过新颖的镍催化交叉偶联反应,设计并合成了以邻-甲硼烷部分为电子受体和1,3,5-三芳基-2-吡唑啉为电子供体的四个DA-D三单元组。四个三合会表现出聚集诱导发射(AIE)属性。通过紫外可见吸收和荧光光谱,时间分辨荧光,X射线晶体学,CV和DFT理论计算,系统地研究了这些化合物的光物理性质和晶体堆积结构。光致发光光谱表明红移(λ最大 = 596–638 nm),随着取代基的供电子能力的提高,并伴随着从黄色到亮红色的系统颜色调谐,固态时具有很高的荧光量子产率(35.7%)。AIE机制可能归因于邻-甲硼烷的分子运动和Cc - Cc键振动的限制,这增强了邻-甲硼烷-双(1,3,5-三芳基-2-吡唑啉)的分子内电荷转移(ICT))衍生产品。DFT计算进一步证明,取代基的变化是精确控制AIE色彩的一种可能方法。