Inorganic Chemistry Department, Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran.
Group for Molecular Engineering of Advanced Functional Materials (GMA), Chemistry Department, University of Zanjan, Zanjan, Iran.
Dalton Trans. 2022 Mar 1;51(9):3652-3660. doi: 10.1039/d1dt03212g.
From the practical point of view, the stability, response time and efficiency of near-infrared light-emitting electrochemical cells (NIR-LECs) are key factors. By using the high potential of chemical modification potential of the phenanthroimidazole ligand, three new binuclear ruthenium(II) complexes with an alkyl spacer as the NIR-emitter were designed and synthesized. NIR-LECs based on these complexes exhibit near-infrared emission at the maximum wavelength of up to 705 nm and with an EQE of up to 0.72% at 4.0 V, which are among the highest values for NIR-LECs based on cationic binuclear ruthenium(II) complexes reported so far. The lifetimes of NIR-LECs based on binuclear complexes were increased about 1.5-to-4-fold with respect to the ones based on mononuclear complexes. Furthermore, a significant decrease in the turn-on time of NIR-LECs by chemical tethering of a new ionic methylpyridinium moiety from 6.3 to 1.4 minutes was observed. It seems that this combinational modification approach can open a new avenue for practical applications.
从实际的角度来看，近红外发光电化学电池（NIR-LECs）的稳定性、响应时间和效率是关键因素。通过利用苯并咪唑配体的化学修饰电势的高电位，设计并合成了三个具有烷基间隔基的新型双核钌（II）配合物作为 NIR 发射器。基于这些配合物的 NIR-LECs 在最大波长处表现出近红外发射，最大波长可达 705nm，在 4.0V 时的 EQE 高达 0.72%，这是迄今为止报道的基于阳离子双核钌（II）配合物的 NIR-LECs 中的最高值之一。与单核配合物相比，基于双核配合物的 NIR-LECs 的寿命提高了约 1.5 至 4 倍。此外，通过化学键合一个新的离子甲基吡啶部分，观察到 NIR-LECs 的开启时间从 6.3 分钟显著缩短至 1.4 分钟。这种组合修饰方法似乎为实际应用开辟了一条新途径。
