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NO Release from trans-[Ru(NH3)4L(NO)]3+ Complexes Upon Reduction (L = 1-Methylimidazole or Benzoimidazole)

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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 [ν(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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Authors and Affiliations

  1. Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, cx, Postal 12200, cep, 60455-960, Fortaleza, CE, Brazil

    Alda K.M. Holanda, Daniel L. Pontes, Izaura C.N. Diógenes, Ícaro S. Moreira & Luiz G.F. Lopes

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  1. Alda K.M. Holanda
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  2. Daniel L. Pontes
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  3. Izaura C.N. Diógenes
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  4. Ícaro S. Moreira
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  5. Luiz G.F. Lopes
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Holanda, A.K., Pontes, D.L., Diógenes, I.C. et al. NO Release from trans-[Ru(NH3)4L(NO)]3+ Complexes Upon Reduction (L = 1-Methylimidazole or Benzoimidazole). Transition Metal Chemistry 29, 430–436 (2004). https://doi.org/10.1023/B:TMCH.0000027458.80926.3c

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