Photophysical study of spiro-bifluorene bridged Pt(ii), Os(ii) and Ir(iii) luminescent complexes and supramolecular arrays
作者:Maria Pia Gullo、Julie Batcha Seneclauze、Barbara Ventura、Andrea Barbieri、Raymond Ziessel
DOI:10.1039/c3dt52007b
日期:——
This paper describes expeditious stepwise synthesis of polynuclear complexes based on heteroleptic iridium(III) and osmium(II) fragments linked to a central Pt(II) module via a spirobifluorene-bridge using a strategy based on the construction of preformed complexes. The luminescence features of the final multi-chromophoric array, i.e. a tetrad consisting of spirobifluorene-bridged Pt, Ir and Os complexes, have been studied by comparison with the features of reference complexes bearing two identical luminophores (Ir or Os) at the periphery. The 3MPtLCT and 3LC states of the Pt and spiro ligand undergo fast energy transfer into the 3MIrLCT or the 3MOsLCT state in the Pt–M2 (M = Ir or Os) arrays, whereas the 3LC and the 3MPtLCT states function as energy reservoirs for the metal excited states close in energy, resulting in a pronounced increase of the excited state lifetimes of these arrays. The tetrad efficiently works as an antenna system where the collected light energy is transferred to the Os unit acting as the final collector.
本文介绍了通过螺二芴桥与中心铂(II)模块相连的异极铱(III)和锇(II)片段,利用预成配合物构建策略,快速分步合成多核配合物。通过与外围带有两个相同发光体(Ir 或 Os)的参考复合物的特征进行比较,研究了最终多色素阵列(即由螺双芴桥接的 Pt、Ir 和 Os 复合物组成的四面体)的发光特征。在 Pt-M2(M = Ir 或 Os)阵列中,铂和螺配体的 3MPtLCT 和 3LC 态会快速转移能量到 3MIrLCT 或 3MOsLCT 态,而 3LC 和 3MPtLCT 态则充当能量接近的金属激发态的储能器,从而明显增加了这些阵列的激发态寿命。四元阵列作为一个天线系统有效地工作,收集到的光能被传输到作为最终收集器的 Os 单元。