Issue 16, 2013

Pyridyl- and benzimidazole-based ruthenium(iii) complex for selective chloride recognition through fluorescence spectroscopy

Abstract

Three ruthenium(II) and (III) metal complexes of the compositions ([Ru(1)(Cl)(PPh3)]+ (4), ([Ru(2)(Cl)(PPh3)]+ (5) and ([Ru(3)(Cl)(H2O)]2+ (6) have been synthesized from oligodentate pyridyl-(1) and benzimidazole ligands (2–3) and structurally characterized. Our investigations revealed that if the coordination sphere of the metal ion carries a strong coordinating PPh3 ligand (complexes 4 and 5), the framework was not suitable for anion binding at all. However, when coordination of solvent (H2O) to the metal centre occurred instead (complex 6), a receptor for anion recognition through fluorescence spectroscopy could be generated. This allowed us to develop a sensor for the selective recognition of chloride over several other anions. In order to screen potential applications, the sensor was tested for the determination of chloride concentration in a series of four commercially available oral rehydration salts, giving excellent agreement with the values reported by the corresponding manufacturer. The detection limit was established to be 5 μM.

Graphical abstract: Pyridyl- and benzimidazole-based ruthenium(iii) complex for selective chloride recognition through fluorescence spectroscopy

Supplementary files

Article information

Article type
Paper
Submitted
17 Mar 2013
Accepted
05 May 2013
First published
08 May 2013

Anal. Methods, 2013,5, 3880-3887

Pyridyl- and benzimidazole-based ruthenium(III) complex for selective chloride recognition through fluorescence spectroscopy

H. Sharma, H. J. Guadalupe, J. Narayanan, H. Hofeld, T. Pandiyan and N. Singh, Anal. Methods, 2013, 5, 3880 DOI: 10.1039/C3AY40434J

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