pH-induced fluorescence switch of two novel tetranuclear Ru(II) polypyridyl complexes
作者:Feixiang Cheng、Ning Tang、Jishu Chen、Fan Wang、Longhai Chen
DOI:10.1016/j.inoche.2011.03.006
日期:2011.6
and corresponding Ru(II) complexes [(bpy)8L1–2(RuII)4](PF6)8, shortly called Ru–L1–2, have been synthesized and characterized. The pH effects on UV–vis absorption and fluorescence spectra of the two complexes are studied, and ground- and excited-state ionization constants of the two complexes are derived. The two complexes act as pH-induced “off–on–off” fluorescence switches through protonation and
四足配体 tetrakis4-((1,10-phenanthroline-[5,6-d]imidazol-2-yl)phenoxy)methyl}methane (L1), tetrakis3-((1,10-phenanthroline-[5 ,6-d]imidazol-2-yl)phenoxy)methyl}methane (L2), 和相应的 Ru(II) 配合物 [(bpy)8L1–2(RuII)4](PF6)8, 简称 Ru–L1– 2、已经合成和表征。研究了pH对两种配合物的紫外-可见吸收和荧光光谱的影响,并推导出了两种配合物的基态和激发态电离常数。这两种复合物在室温下在缓冲溶液中通过质子化和去质子化作为 pH 诱导的“关-开-关”荧光开关。