High-Yielding Syntheses of Multifunctionalized Ru<sup>II</sup> Polypyridyl-Type Sensitizer: Experimental and Computational Insights into Coordination
作者:Tina Mede、Michael Jäger、Ulrich S. Schubert
DOI:10.1021/acs.inorgchem.9b00847
日期:2019.8.5
RuII complexes based on functionalized 2,6-di(quinolin-8-yl)pyridine (dqp) ligands feature excellent photophysical and geometrical properties, thus suggesting dqp ligands as ideal surrogates for 2,2′-bipyridine (bpy) or 2,2’:6′,2″-terpyridine (tpy). However, the synthesis of multifunctionalized [Ru(dqp)2]2+-based complexes is often low-yielding, which has hampered their practical value to date. In
基于功能化的2,6-二(喹啉-8-基)吡啶(dqp)配体的Ru II配合物具有出色的光物理和几何性质,因此表明dqp配体是2,2'-联吡啶(bpy)或2的理想替代物2′:6′,2″-三联吡啶(tpy)。然而,基于多官能团的[Ru(dqp)2 ] 2+的配合物的合成通常是低产率的,迄今为止阻碍了它们的实用价值。在这项研究中,通过基于1 H NMR,MS和密度泛函理论的机理研究,探索并证实了一种通用的高产路线。在前体[Ru(dqp)(MeCN)3 ] 2+与dqp配位过程中,使用高沸点但不那么配位的溶剂(即DMF),所需的反应温度将大大降低(降低30°C)。与tpy相比,dqp的反应速率进一步降低,这在配位过程中被分配给更高的空间需求。即,与以前的方案相比,在60°C时tpy衍生物和在90°C时dqp的配位开始显着温和。该方法的多功能性通过高达90%的多官能化Ru II配合物的高产率合成得到证