Proton-induced fluorescence switch of a novel hexanuclear Ru(II) polypyridyl complex containing imidazole ring
| Autor: | Ning Tang, Longhai Chen, Jishu Chen, Feixiang Cheng |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Chemistry
Ligand Metals and Alloys Protonation Buffer solution Condensed Matter Physics Photochemistry Fluorescence Medicinal chemistry Sodium methoxide Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Deprotonation Excited state Materials Chemistry Imidazole Electrical and Electronic Engineering Instrumentation |
| Zdroj: | Sensors and Actuators B: Chemical. :102-109 |
| ISSN: | 0925-4005 |
| Popis: | Hexapodal ligand H 6 L containing imidazole groups has been prepared by the reaction of 1,2,3,4,5,6-hexakis[(4-formylphenoxy)methyl]benzene with 1,10-phenanthroline-5,6-dione. Hexanuclear complex [RuH 6 L](PF 6 ) 12 has been obtained by the condensation of Ru(bpy) 2 Cl 2 ·2H 2 O and H 6 L, and isolated as PF 6 − salt. The deprotonated complex [RuL] 6+ was achieved by reaction of sodium methoxide with complex [RuH 6 L] 12+ in methanol. The pH effects on the UV–vis absorption and fluorescence spectra of complex [RuH 6 L](PF 6 ) 12 are studied, and ground and excited state ionization constants of the complex are derived. The absorption and fluorescence spectra of the complex are both strongly dependent on the solution pH. Complex [RuH 6 L](PF 6 ) 12 acts as “on–off” fluorescence pH sensor through protonation and deprotonation of imidazole groups with a maximum on–off ratio of 5 in buffer solution at room temperature. |
| Databáze: | OpenAIRE |
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