Structural and Theoretical Insights into the AIE Attributes of Phosphindole Oxide: The Balance Between Rigidity and Flexibility
作者:Fan Bu、Erjing Wang、Qian Peng、Rongrong Hu、Anjun Qin、Zujin Zhao、Ben Zhong Tang
DOI:10.1002/chem.201405902
日期:2015.3.9
phosphorus‐containing heterocycles, 1,2,3,4,5‐pentaphenylphosphole‐1‐oxide (PPPO), 1,2,3‐triphenylphosphindole‐1‐oxide (TPPIO), and 1,2,3‐triphenylphosphindole (TPPI), were synthesized and characterized. Their optical properties, crystal‐packing manners, electronic features, and fluorescence dynamics were systematically investigated, and theoretical calculations were performed to decipher structure–property
分子内的多次运动会在光激发时消耗发光分子的激发态能量,从而降低发射效率。芳香环的低频旋转运动可以通过在凝结相中的空间约束而容易地受到限制,但是高频键的拉伸运动很难通过聚集来抑制。在这项工作中,三个含磷杂环分别为1,2,3,4,5-五苯基磷腈-1-氧化物(PPPO),1,2,3-三苯基磷吲哚-1-氧化物(TPPIO)和1,2,3 ‐triphenylphosphindole(TPPI),已合成并表征。对它们的光学性质,晶体堆积方式,电子特征和荧光动力学进行了系统研究,并进行了理论计算以破译结构与性质之间的关系。结果表明,这些发光剂在溶液中是弱发射体,但在聚集体中显示出强发射,表现出明显的聚集诱导发射(AIE)特征。在PPPO中占主导地位的对聚合不敏感的拉伸运动在TPPIO中降低,从而使TPPIO的荧光比聚合中的PPPO更有效。TPPI中的拉伸运动甚至更低,但由于聚集体中强烈的π-π堆积相互作