Ruthenium Complexes of Tripodal Ligands with Pyridine and Triazole Arms: Subtle Tuning of Thermal, Electrochemical, and Photochemical Reactivity
作者:Fritz Weisser、Stephan Hohloch、Sebastian Plebst、David Schweinfurth、Biprajit Sarkar
DOI:10.1002/chem.201303640
日期:2014.1.13
Electrochemical and photochemical bond‐activation steps are important for a variety of chemical transformations. We present here four new complexes, [Ru(Ln)(dmso)(Cl)]PF6 (1–4), where Ln is a tripodal amine ligand with 4−n pyridylmethyl arms and n−1 triazolylmethyl arms. Structural comparisons show that the triazoles bind closer to the Ru center than the pyridines. For L2, two isomers (with respect
电化学和光化学键活化步骤对于各种化学转化很重要。我们在这里提出四个新的复合物,的[Ru(L Ñ)(DMSO)(CL)] PF 6(1 - 4),其中L Ñ是三足胺配体与4- Ñ吡啶基甲基武器和Ñ -1三唑基甲基臂。结构比较表明,三唑比吡啶更靠近Ru中心。对于L 2,有两个异构体(相对于三唑臂的位置,是赤道的还是轴向的),trans - 2 sym和trans - 2 un,可以分开比较。在配体的三唑臂的数量的增加对在Ru几乎没有影响II /茹III的氧化电势,但它增加了钌的稳定性小号DMSO键。因此,氧化波从变得更加可逆反式- 1到反式- 4,和而DMSO配体容易解离从反式- 1在加热或用UV光照射,在Ru 的S键的反式- 4具遗体下完全稳定相同的条件。汝的实力S键不仅受三唑臂数的影响,而且受其位置的影响,这由两种异构体氧化还原行为和反应性(trans - 2 sym和trans -