How does the acidic milieu interfere in the capability of ruthenium nitrosyl complexes to release nitric oxide?
Autor
Orenha R.P.
Morgon N.H.
Contreras-García J.
Silva G.C.G.
Nagurniak G.R.
Piotrowski M.J.
Caramori G.F.
Muñoz-Castro A.
Parreira R.L.T.
Resumen
The nitric oxide (NO) molecule is involved in a large number of biological routes. Thus, there is increasing interest in improving the understanding of the NO release mechanisms. One of the traditional NO release mechanisms involves (i) [Ru(NO)(NH3)5]3+ + e- → [Ru(NO)(NH3)5]2+ and (ii) [Ru(NO)(NH3)5]2+ + H2O → [Ru(H2O)(NH3)5]2+ + NO chemical reactions. Another possibility is associated with light irradiation: (iii) [Ru(NO)(NH3)5]3+ + H2O + hν → [Ru(H2O)(NH3)5]3+ + NO, aided by the Ru(dπ) → π∗(NO) electronic transition, which decreases the π back-donation process in the Ru-NO chemical bond. The influence of the acid environment in which these chemical reactions typically occur experimentally has been explored in (iv) [Ru(NO)(NH3)5]2+ + H3O+ → [Ru(HNO)(NH3)5]3+ + H2O; and (v) [Ru(HNO)(NH3)5]3+ + H2O → [Ru(H2O)(NH3)5]3+ + HNO reactions. Reaction (v), supported by eight explicit water molecules, is the most propitious to occur. The HNO charge obtained from the atomic polar tensor scheme is close to zero. The methods of quantum theory of atoms in molecules and non-covalent interactions reveal that the HNO leaving group interacts with two water molecules through partially covalent or ionic chemical bonds. The HNO → NO conversion after the release from ruthenium molecules is thermodynamically feasible. The electronic spectrum of the structure [Ru(HNO)(NH3)5]3+ has, unlike the [Ru(NO)(NH3)5]3+ molecule, the Ru(dπ) → π∗(NO) transition with an appropriate absorbance. Therefore, the proton increases the capability of ruthenium complexes to release nitric oxide after the chemical reduction reaction or the light-supported chemical reaction. © 2020 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
Colecciones
Ítems relacionados
Mostrando ítems relacionados por Título, autor o materia.
-
Article
The simultaneous recognition mechanism of cations and anions using macrocyclic-iodine structures: insights from dispersion-corrected DFT calculations (2020)
Pereira Orenha, Renato; Nagurniak, Glaucio R.; Cachoeira Colaço, Matheus; Finoto Caramori, Giovanni; Jeomar Piotrowski, Maurício; de Araújo Batista, Krys Elly; Muñoz-Castro, Alvaro; de Almeida Silva, Breno; Esteves, Benjamim José; Parreira, R. L.T. (NLM (Medline), 2020-11-07)The recent development of compounds for recognizing ions highlights the applicability of this area. In this work, the simultaneous recognition of cations (Li+, Na+ and K+) and anions (F-, Cl- and I-) using a macrocycle ... -
Article
Theoretical study of chloride complexes with hybrid macrocycles (2021)
Silva, Éder Henrique Da; Pereira Orenha, Renato; Muñoz-Castro, Alvaro; Finoto Caramori, Giovanni; Cachoeira Colaço, Matheus; Guerra Silva, Graziele Capatto; Parreira, R. L.T. (Royal Society of Chemistry, 2021-01-07)Anions show relevant roles in biological routes. The supramolecular chemistry investigates the chemical bonding between two or more molecules and/or ions. Herein, the nature of the bond between chloride anions and macrocycle ... -
Article
The usefulness of energy decomposition schemes to rationalize host-guest interactions (2021)
Caramori, Giovanni Finoto; Østrøm, Ina; Ortolan, Alexandre Osmar; Nagurniak, Glaucio R.; Besen, Vitor M.; Muñoz-Castro, Alvaro; Pereira Orenha, Renato; Galembeck, Sergio Emanuel; Parreira, Renato L.T. (Royal Society of Chemistry, 2020-12-28)This perspective focuses on the crucial role that energy decomposition schemes play in elucidating the physical nature of non-covalent interactions in supramolecular systems, particularly from the point of view of host-guest ...