NO Release from trans-[Ru(NH3)4L(NO)]3+ Complexes Upon Reduction (L = 1-Methylimidazole or Benzoimidazole) |
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Authors: | Holanda Alda KM Pontes Daniel L Diógenes Izaura CN Moreira Ícaro S Lopes Luiz GF |
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Institution: | (1) Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, cx, Postal 12200, cep, 60455-960 Fortaleza, CE, Brazil |
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Abstract: | The synthesis, characterization and reactivity of trans-Ru(NH3)4(L)NO](PF6)3(L = benzoimidazole or 1-methylimidazole in trans position to NO) are presented. 1H-n.m.r. spectroscopy data indicate that the benzoimidazole and 1-methylimidazole ligands are coordinated to RuII through carbon and nitrogen, respectively. The nitrosyl stretching frequencies (NO) > 1900 cm–1] suggest that the coordinated nitrosyl has substantial NO+ character. The complexes undergo a single-electron reduction (E
0–0.245 versus NHE), which involves the coordinated nitrosyl. Dissociation of NO in the reduced species is facilitated by the 1-methylimidazole ligand, which is not observed for the benzoimidazole species. The complex with 1-methylimidazole does not suffer hydroxide attack on the NO+, at least at pH values lower than 11. |
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