摘要:
Tripodal ligands 1,3,5-tris{4-((1,10-phenanthroline-[5,6-d]imidazol-2-yl)phenoxy)methyl}-2,4,6-trimethyl-benzene (L-1), 1,1,1-tris{4-((1,10-phenanthroline-[5,6-d]imidazol-2-yl)phenoxy)methyl)propane (L-2), 2,2',2 ''-tris{4-((1,10-phenanthroline-[5,6-d]imidazol-2-yl)phenoxy)ethyl}amine (L-3), and corresponding Ru(II) complexes [(bpy)(6)L1-3(Ru-II)(3)](PF6)(6), shortly called (Ru-L1-3), have been synthesized. UV-vis absorption and fluorescence spectra of these complexes are both strongly dependent on the pH of the buffer solution. These complexes act as pH-induced off-on-off fluorescence switch through protonation and deprotonation of the imidazole-containing ligands. (C) 2010 Elsevier B.V. All rights reserved.