A Tripodal Ruthenium(II) Polypyridyl Complex with pH Controlled Emissive Quenching
作者:Rodney T. Brown、Nicholas C. Fletcher、Lefteris Danos、Nathan R. Halcovitch
DOI:10.1002/ejic.201800891
日期:2019.1.10
A tripodal podand has been prepared and complexed to ruthenium(II) creating a metal complex with C3-symmetry and an enclosed cavity. The complex shows the anticipated enhanced emission when compared to [Ru(bipy)3]2+ in acetonitrile. The emission from this cryptand like structure is invariant to the introduction of monovalent cations in aqueous solution, but a significant drop in the emission was observed
已经制备了一个三足形的 podand 并与钌 (II) 络合,形成了具有 C3 对称性和封闭腔的金属络合物。与乙腈中的 [Ru(bipy)3]2+ 相比,该配合物显示出预期的增强发射。这种穴状结构的发射对于在水溶液中引入单价阳离子是不变的,但是随着 pH 在很宽的 pH 范围(3 到 12)内增加,观察到发射显着下降。这归因于 N 到 t2g 电子在未质子化形式的激发态转移,转移速率约为 4.2 x 105 s-1。晶体结构表明空腔内包含水,这表明叔胺的质子化可以通过紧邻刚性空腔内的水分子有效缓和