A new family of trinuclear Ru(II) polypyridyl complexes acting as pH-induced fluorescence switch |
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| Authors: | Feixiang Cheng Ning Tang Jishu Chen Fan Wang Longhai Chen |
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| Affiliation: | 1. College of Chemistry and Chemical Engineering, Qujing Normal University, Qujing 655011, China;2. College of Chemistry and Chemical Engineering and State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China |
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| Abstract: | Tripodal ligands 1,3,5-tris{4-((1,10-phenanthroline-[5,6-d]imidazol-2-yl)phenoxy)methyl}-2,4,6-trimethylbenzene (L1), 1,1,1-tris{4-((1,10-phenanthroline-[5,6-d]imidazol-2-yl)phenoxy)methyl}propane (L2), 2,2′,2′′-tris{4-((1,10-phenanthroline-[5,6-d]imidazol-2-yl)phenoxy)ethyl}amine (L3), and corresponding Ru(II) complexes [(bpy)6L1–3(RuII)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. |
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