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Ruthenium(II) complexes with phenanthroline-, benzimidazole-, benzothiazole-, and pyridine-derived bidentate and tridentate ligands: reactivity and spectroscopic and electrochemical characterization

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Summary

Ruthenium complexes of some tridentate and bidentate benzimidazole-, benzothiazole- and pyridine-derived ligands have been prepared as their PF p−f6 salts, and their constitutions have been confirmed by elemental analysis, 1H-n.m.r. spectroscopy and electrochemistry. The complexes are redox-active, displaying a metal-centred RuII/ RuIII oxidation process and sequential ligand-localized reduction processes. Both the 2-(2′-pyridyl)benzimidazole complex [Ru(PybimH)3]2+ and the 2,2′-dipyridylamine one, [Ru(DpyaH)3]2+ behave as weak Brønsted-Lowry acids. The secondary amino nitrogen of each DpyaH in the [Ru(DpyaH)3]2+ complex can be deprotonated with hydride anion, and then acts as a strong nucleophile, allowing selective N-alkylation by alkyl halides. Most of the complexes exhibit ligand-localized luminescence emission at ambient temperature. The strong intrinsic fluorescences of 2-(2′-quinolyl)-N-methylbenzimidazole and 2-(2′-pyridyl)-benzimidazole are quenched when they are coordinated to RuII, and emission from the chelates entailing 5-nitro-1:10-phenanthroline occurs only from the non-nitrated ligands.

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Authors and Affiliations

  1. Chemistry Department, Drexel University, 19104-2875, Philadelphia, PA, USA

    Michael R. McDevitt, Yu Ru & Anthony W. Addison

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  1. Michael R. McDevitt
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  2. Yu Ru
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  3. Anthony W. Addison
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McDevitt, M.R., Ru, Y. & Addison, A.W. Ruthenium(II) complexes with phenanthroline-, benzimidazole-, benzothiazole-, and pyridine-derived bidentate and tridentate ligands: reactivity and spectroscopic and electrochemical characterization. Transition Met Chem 18, 197–204 (1993). https://doi.org/10.1007/BF00139956

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