A library of emission spectra of 90 bis-cyclometallated iridium complexes has been obtained using a simple combinatorial approach performed at room temperature. Trends in emission maxima are rationalized using Hammett parameters and invoking inter ligand energy transfer (ILET) processes. The screening approach allowed us to observe trends in the broadness of emission spectra opening the way for a rational approach to the engineering of the emission colour purity at a molecular level. Finally limitations to the screening strategy are discussed using a case study that involves two different monodentate ligands.
通过在室温下使用简单的组合方法,我们获得了90种双环
金属化
铱复合物的发射光谱库。使用哈米特参数和
配体间能量转移(ILET)过程,我们合理地解释了发射峰的最大值趋势。筛选方法使我们能够观察到发射光谱宽度的趋势,从而为在分子
水平上合理设计发射颜色的纯度开辟了道路。最后,我们通过一个涉及两种不同单齿
配体的案例研究讨论了筛选策略的局限性。