Effect of molecular conformation on the efficiency of the spin orbital charge recombination-induced intersystem crossing in bianthryls
作者:Xiaoyu Zhao、Andrey A. Sukhanov、Kepeng Chen、Xinyu Geng、Yu Dong、Violeta K. Voronkova、Jianzhang Zhao、Lang Liu
DOI:10.1016/j.dyepig.2020.109121
日期:2021.3
moieties and the electronic coupling and intersystem crossing (ISC) efficiency. The anthryl moieties in the two dyads adopt a close-to-orthogonal geometry, with dihedral angles of 90° (9,9′-bianthryl) and 106° (2,9′-bianthryl) at the ground state, respectively. The charge transfer (CT) emission efficiency and the fluorescence lifetimes are clearly dependent on the electronic coupling between the two anthryls
研究了两个联蒽基二元组,两个单元连接在蒽基部分的2或9位上,以建立蒽基部分的取向与电子偶联和系统间交叉(ISC)效率之间的关系。两个二元组中的蒽基部分具有接近于正交的几何形状,在基态下的二面角分别为90°(9,9'-bianthryl)和106°(2,9'-bianthryl)。电荷转移(CT)的发射效率和荧光寿命显然取决于两个蒽基之间的电子偶联,较强的偶联会导致较高的荧光量子产率(34%对9%)和较短的发光寿命(13.9 ns对荧光)。 38.6 ns)。具有更正交几何形状的双蒽具有更高的单线态氧量子产率ΦΔ(9,9'-联蒽,Φ Δ = 53%)比2,9'联蒽(Φ Δ = 32%)。此外,高度极性溶剂依赖性荧光发射和Φ Δ,观察所述成对层(Φ Δ = 22-53%),这是由单体蒽的趋势不同,因此,我们提出自旋轨道电荷转移ISC(SOCT -ISC)负责dyad的三重态生产。有趣的是