Photoinduced Dynamics of Bis-dipyrrinato-palladium(II) and Porphodimethenato-palladium(II) Complexes: Governing Near Infrared Phosphorescence by Structural Restriction
作者:Stefan Riese、Marco Holzapfel、Alexander Schmiedel、Ingo Gert、David Schmidt、Frank Würthner、Christoph Lambert
DOI:10.1021/acs.inorgchem.8b00974
日期:2018.10.15
bis-dipyrrinato-palladium(II) complex 1 and the bridged porphodimethenato-palladium(II) complex 2 possess dramatically different structures in the ground state (proved by X-ray structure analysis) and in the singlet and triplet excited states (calculated by density functional theory methods). While complex 2 is rather rigid, complex 1 undergoes a major structural reorganization in the excited state to yield a disphenoidal
尽管在表面上相似,但双-二吡啶并钯-(II)配合物1和桥连的二甲萘酚-钯(II)配合物2在基态(通过X射线结构分析证明)以及在单重态和三重态激发下具有显着不同的结构。状态(通过密度泛函理论方法计算)。尽管复合物2是相当刚性的,但是复合物1在激发态下经历了主要的结构重组,从而产生了双曲线(跷跷板)三重态。激发态的动力学是通过瞬态吸收光谱法探测的,其具有飞秒和纳秒级的时间分辨率,并具有荧光上转换和产生约ca的系统间交叉速率常数。(13–16 ps)-1。在配合物2中观察到明显的近红外磷光,但在配合物1在流体溶液中不存在任何发射的现象,可以通过1的结构重组而合理化,这会导致三重态金属居中状态变为无发射。