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Orzeł Ł, Oszajca M, Polaczek J, Porębska D, van Eldik R, Stochel G. High-Pressure Mechanistic Insight into Bioinorganic NO Chemistry. Molecules 2021; 26:molecules26164947. [PMID: 34443535 PMCID: PMC8401417 DOI: 10.3390/molecules26164947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 08/06/2021] [Accepted: 08/12/2021] [Indexed: 11/23/2022] Open
Abstract
Pressure is one of the most important parameters controlling the kinetics of chemical reactions. The ability to combine high-pressure techniques with time-resolved spectroscopy has provided a powerful tool in the study of reaction mechanisms. This review is focused on the supporting role of high-pressure kinetic and spectroscopic methods in the exploration of nitric oxide bioinorganic chemistry. Nitric oxide and other reactive nitrogen species (RNS) are important biological mediators involved in both physiological and pathological processes. Understanding molecular mechanisms of their interactions with redox-active metal/non-metal centers in biological targets, such as cofactors, prosthetic groups, and proteins, is crucial for the improved therapy of various diseases. The present review is an attempt to demonstrate how the application of high-pressure kinetic and spectroscopic methods can add additional information, thus enabling the mechanistic interpretation of various NO bioinorganic reactions.
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Affiliation(s)
- Łukasz Orzeł
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland; (Ł.O.); (M.O.); (J.P.); (D.P.)
| | - Maria Oszajca
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland; (Ł.O.); (M.O.); (J.P.); (D.P.)
| | - Justyna Polaczek
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland; (Ł.O.); (M.O.); (J.P.); (D.P.)
| | - Dominika Porębska
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland; (Ł.O.); (M.O.); (J.P.); (D.P.)
| | - Rudi van Eldik
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland; (Ł.O.); (M.O.); (J.P.); (D.P.)
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Egerlandstr 1, 91058 Erlangen, Germany
- Correspondence: (R.v.E.); (G.S.); Tel.: +48-66-777-2932 (R.v.E.); +48-12-686-2502 (G.S.)
| | - Grażyna Stochel
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland; (Ł.O.); (M.O.); (J.P.); (D.P.)
- Correspondence: (R.v.E.); (G.S.); Tel.: +48-66-777-2932 (R.v.E.); +48-12-686-2502 (G.S.)
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Yuan Q, Du Y, Chao L, Xie Q. Preparation of a uniform thin-film Pd-Au electrocatalyst via electroreduction of a palladium hexacyanoferrate(II)-Au electrodeposit for alkaline oxidation of methanol. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Specht P, Oßberger M, Klüfers P, Schindler S. Kinetic studies on the reaction of NO with iron(ii) complexes using low temperature stopped-flow techniques. Dalton Trans 2020; 49:9480-9486. [PMID: 32608457 DOI: 10.1039/d0dt01764g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Low temperature stopped-flow techniques were used to investigate the reaction of three different iron(ii) complexes with nitrogen monoxide. The kinetic studies allowed calculation of the activation parameters from the corresponding Eyring plots for all three systems. The reaction of iron(ii) chloride with NO leading to the formation of MNIC (mononitrosyl-iron-complex) and DNIC (dinitrosyl-iron-complex) led to activation parameters of ΔH‡ = 55.4 ± 0.4 kJ mol-1 and ΔS‡ = 13 ± 2 J K-1 mol-1 for MNIC and ΔH‡ = 32 ± 6 kJ mol-1 and ΔS‡ = -193 ± 21 J K-1 mol-1 for DNIC. Formation of MNIC turned out to be much faster in comparison with DNIC. In contrast, activation parameters for the formation of monoculear [Fe(bztpen)(NO)](OTf)2 (bztpen = N-benzyl-N,N',N'-tris(2-pyridylmethyl)-ethylenediamine) ΔH‡ = 17.8 ± 0.8 kJ mol-1 and ΔS‡ = -181 ± 3 J K-1 mol-1 supported an associative mechanism. Interestingly, [Fe(bztpen)(CH3CN)](OTf)2 does not react with dioxygen at all. Furthermore, activation parameters of ΔH‡ = 37.7 ± 0.7 kJ mol-1 and ΔS‡ = -66 ± 3 J K-1 mol-1 were obtained for the reaction of NO with the dinuclear iron(ii) H-HPTB complex (H-HPTB = N,N,N',N'-tetrakis(2-benzimidazolylmethyl)-2-hydroxy-1,3-diaminopropane), [Fe2(H-HPTB)(Cl)3]. The kinetic data allowed postulation of the mechanisms for all of these reactions.
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Affiliation(s)
- Pascal Specht
- Institut für Anorganische und Analytische Chemie, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 17, 35392 Gießen, Germany.
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Hubbard CD, Chatterjee D, Oszajca M, Polaczek J, Impert O, Chrzanowska M, Katafias A, Puchta R, van Eldik R. Inorganic reaction mechanisms. A personal journey. Dalton Trans 2020; 49:4599-4659. [PMID: 32162632 DOI: 10.1039/c9dt04620h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
This review covers highlights of the work performed in the van Eldik group on inorganic reaction mechanisms over the past two decades in the form of a personal journey. Topics that are covered include, from NO to HNO chemistry, peroxide activation in model porphyrin and enzymatic systems, the wonder-world of RuIII(edta) chemistry, redox chemistry of Ru(iii) complexes, Ru(ii) polypyridyl complexes and their application, relevant physicochemical properties and reaction mechanisms in ionic liquids, and mechanistic insight from computational chemistry. In each of these sections, typical examples of mechanistic studies are presented in reference to related work reported in the literature.
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Affiliation(s)
- Colin D Hubbard
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Egerlandstr. 1, 91058 Erlangen, Germany.
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Roncaroli F, Meier R. Kinetics of the reaction of nitric oxide with polypyridylamine iron(II) complexes. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1057710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Federico Roncaroli
- Departamento de Física de la Materia Condensada, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina
| | - Roland Meier
- Zentrum für Angewandte Forschung, Technische Hochschule Ingolstadt, Ingolstadt, Germany
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Dastangoo H, Poureshghi F. On the ability of metal-nitroprusside complexes as electrode modifiers: Characterization and electrochemical study of palladized aluminum electrode modified with iron pentacyanonitrosylferrate. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.02.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Bari SE, Olabe JA, Slep LD. Three Redox States of Metallonitrosyls in Aqueous Solution. ADVANCES IN INORGANIC CHEMISTRY 2015. [DOI: 10.1016/bs.adioch.2014.10.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Bakac A, Pestovsky O, Durfey BL, Kristian KE. Kinetics and thermodynamics of nitric oxide binding to transition metal complexes. Relationship to dioxygen binding. Chem Sci 2013. [DOI: 10.1039/c3sc50157d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Franke A, van Eldik R. Factors That Determine the Mechanism of NO Activation by Metal Complexes of Biological and Environmental Relevance. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201201111] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Montenegro AC, Bari SE, Olabe JA. Reactivity of iron(II)-bound nitrosyl hydride (HNO, nitroxyl) in aqueous solution. J Inorg Biochem 2012; 118:108-14. [PMID: 23153690 DOI: 10.1016/j.jinorgbio.2012.10.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Revised: 10/15/2012] [Accepted: 10/16/2012] [Indexed: 10/27/2022]
Abstract
The reactivity of coordinated nitroxyl (HNO) has been explored with the [Fe(II)(CN)(5)HNO](3-) complex in aqueous medium, pH 6. We discuss essential biorelevant issues as the thermal and photochemical decompositions, the reactivity toward HNO dissociation, the electrochemical behavior, and the reactions with oxidizing and reducing agents. The spontaneous decomposition in the absence of light yielded a two-electron oxidized species, the nitroprusside anion, [Fe(II)(CN)(5)NO](2-), and a negligible quantity of N(2)O, with k(obs)≈5×10(-7)s(-1), at 25.0°C. The value of k(obs) represents an upper limit for HNO release, comparable to values reported for other structurally related L ligands in the [Fe(II)(CN)(5)L](n-) series. These results reveal that the FeN bond is strong, suggesting a significant σ-π interaction, as already postulated for other HNO-complexes. The [Fe(II)(CN)(5)HNO](3-) ion showed a quasi-reversible oxidation wave at 0.32 V (vs normal hydrogen electrode), corresponding to the [Fe(II)(CN)(5)HNO](3-)/[Fe(II)(CN)(5)NO](3-),H(+) redox couple. Hexacyanoferrate(III), methylviologen and the nitroprusside ion have been selected as potential oxidants. Only the first reactant achieved a complete oxidation process, initiated by a proton-coupled electron transfer reaction at the HNO ligand, with nitroprusside as a final oxidation product. Dithionite acted as a reductant of [Fe(II)(CN)(5)HNO](3-), in a 4-electron process, giving NH(3). The high stability of bound HNO may resemble the properties in related Fe(II) centers of redox active enzymes. The very minor release of N(2)O shows that the redox conversions may evolve without disruption of the FeN bonds, under competitive conditions with the dissociation of HNO.
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Affiliation(s)
- Andrea C Montenegro
- Departamento de Química Inorgánica, Analítica y Química Física, and INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, Buenos Aires, C1428EHA, Argentina
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Osa Codesido N, De Candia AG, Weyhermüller T, Olabe JA, Slep LD. An Electron-Rich {RuNO}6 Complex: trans-[Ru(DMAP)4(NO)(OH)]2+ - Structure and Reactivity. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200413] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Montenegro AC, Dabrowski SG, Gutiérrez MM, Amorebieta VT, Bari SE, Olabe JA. Catalytic oxidation of hydroxyurea to bound NO+/ NO2- mediated by pentacyano(L)ferrates. Characterization of the nitroxide radical, bound C-nitrosoformamide and NO as reaction intermediates. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.02.051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Pereira ADC, Ford PC, da Silva RS, Bendhack LM. Ruthenium-nitrite complex as pro-drug releases NO in a tissue and enzyme-dependent way. Nitric Oxide 2011; 24:192-8. [DOI: 10.1016/j.niox.2011.03.001] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2010] [Revised: 02/21/2011] [Accepted: 03/01/2011] [Indexed: 11/28/2022]
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De Candia AG, Marcolongo JP, Etchenique R, Slep LD. Widely differing photochemical behavior in related octahedral {Ru-NO}6 compounds: intramolecular redox isomerism of the excited state controlling the photodelivery of NO. Inorg Chem 2010; 49:6925-30. [PMID: 20578716 DOI: 10.1021/ic100491g] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
trans-[(NC)Ru(py)(4)(mu-CN)Ru(py)(4)(NO)](3+) (py = pyridine) is a stable species in aqueous solution. It displays an intense absorption in the visible region of the spectrum (lambda(max) = 518 nm; epsilon(max) = 6100 M(-1) cm(-1)), which turns this compound into a promising agent for the photodelivery of NO. The quantum yield for the photodelivery process resulting from irradiation with 455 nm visible light was found experimentally to be (0.06 +/- 0.01) x 10(-3) mol einstein(-1), almost 3 orders of magnitude smaller than that in the closely related cis-[RuL(NH(3))(4)(mu-pz)Ru(bpy)(2)(NO)](5+) species (L = NH(3) or pyridine, pz = pyrazine, bpy = 2,2'-bipyridine; phi(NO) = 0.02-0.04 mol einstein(-1) depending on L) and also much smaller than the one in the mononuclear compound trans-[ClRu(py)(4)(NO)](2+) (phi(NO) = (1.63 +/- 0.04) x 10(-3) mol einstein(-1)). DFT computations provide an electronic structure picture of the photoactive excited states that helps to understand this apparently abnormal behavior.
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Affiliation(s)
- Ariel G De Candia
- Departamento de Química Inorgánica, Analítica y Química Física, INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires-CONICET, 3er Piso, C1428EHA Buenos Aires, Argentina
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A FRET-based biosensor for NO detection. J Inorg Biochem 2010; 104:619-24. [DOI: 10.1016/j.jinorgbio.2010.02.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2009] [Revised: 02/17/2010] [Accepted: 02/19/2010] [Indexed: 11/20/2022]
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Interplay of thermochemistry and Structural Chemistry, the journal (volume 18, 2007) and the discipline. Struct Chem 2008. [DOI: 10.1007/s11224-008-9380-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Olabe JA. The coordination chemistry of nitrosyl in cyanoferrates. An exhibit of bioinorganic relevant reactions. Dalton Trans 2008:3633-48. [DOI: 10.1039/b803153c] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Roncaroli F, Videla M, Slep LD, Olabe JA. New features in the redox coordination chemistry of metal nitrosyls {M–NO+; M–NO; M–NO−(HNO)}. Coord Chem Rev 2007. [DOI: 10.1016/j.ccr.2007.04.012] [Citation(s) in RCA: 116] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Franke A, Roncaroli F, van Eldik R. Mechanistic Studies on the Activation of NO by Iron and Cobalt Complexes. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200600921] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Alicja Franke
- Institute for Inorganic Chemistry, University of Erlangen‐Nürnberg, Egerlandstr. 1, 91058 Erlangen, Germany
| | - Federico Roncaroli
- Institute for Inorganic Chemistry, University of Erlangen‐Nürnberg, Egerlandstr. 1, 91058 Erlangen, Germany
- Department of Inorganic, Analytical and Physical Chemistry, INQUIMAE, Faculty of Exact and Natural Sciences, University of Buenos Aires, C1428EHA Buenos Aires, Argentina
| | - Rudi van Eldik
- Institute for Inorganic Chemistry, University of Erlangen‐Nürnberg, Egerlandstr. 1, 91058 Erlangen, Germany
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Lee JH, Fan H, Pink M, Caulton KG. Reactivity of ˙NO with an osmium polyhydride: Reductive elimination and reductive nitrosylation on the path from odd- to even-electron molecules. NEW J CHEM 2007. [DOI: 10.1039/b702078c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Videla M, Roncaroli F, Slep LD, Olabe JA. Reactivity of Reduced Nitroprusside, [Fe(CN)5NO•]3-, toward Oxygen. J Am Chem Soc 2006; 129:278-9. [PMID: 17212399 DOI: 10.1021/ja066900i] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mariela Videla
- Departamento de Química InorgAnica, Analítica y Química Física and INQUIMAE, CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, Buenos Aires C1428EHA, Argentina
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Sung J, Hsu SY, Wang TH, Pan A, Yeh A. Kinetic studies of the reactions of pentacyanonitrosylferrate(2−) with ligands containing acidic methylene groups. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2006.04.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Roncaroli F, van Eldik R. Mechanistic Analysis of Reductive Nitrosylation on Water-Soluble Cobalt(III)-Porphyrins. J Am Chem Soc 2006; 128:8042-53. [PMID: 16771520 DOI: 10.1021/ja0549906] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reactions of NO and/or NO2- with three water-soluble cobalt porphyrins [Co(III)(P)(H2O)2]n, where P = TPPS, TCPP, and TMPyP, were studied in detail. At pH < 3, the reaction with NO proceeds through a single reaction step. From the kinetic data and activation parameters, the [Co(III)(P)(NO)(H2O)]n complex is proposed to be the primary product of the reaction with NO. This complex reacts further with a second NO molecule through an inner-sphere electron-transfer reaction to generate the final product, [Co(III)(P)(NO-)](n-1). At pH > 3, although a single reaction step is also observed, a systematic study as a function of the NO and NO2- concentrations revealed that two reaction steps are operative. In the first, NO2- and NO compete to substitute coordinated water in [Co(III)(P)(H2O)2]n to yield [Co(III)(P)(NO)(H2O)]n and [Co(III)(P)(NO2-)(H2O)](n-1) as the primary reaction products. Only the nitrite complex could be detected and no final product formation was observed during the reaction. It is proposed that [Co(III)(P)(NO)(H2O)]n rapidly reacts with NO2- to form the nitrite complex, which in the second reaction step reacts with another NO molecule to generate the final product through an inner-sphere electron-transfer reaction. The reported results are relevant for the interaction of vitamin B(12a) with NO and NO2-.
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Affiliation(s)
- Federico Roncaroli
- Institute for Inorganic Chemistry, University of Erlangen-Nürnberg, Egerlandstrasse 1, 91058 Erlangen, Germany
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Zanichelli PG, Miotto AM, Estrela HFG, Soares FR, Grassi-Kassisse DM, Spadari-Bratfisch RC, Castellano EE, Roncaroli F, Parise AR, Olabe JA, de Brito ARMS, Franco DW. The [Ru(Hedta)NO](0.1-) system: structure, chemical reactivity and biological assays. J Inorg Biochem 2005; 98:1921-32. [PMID: 15522418 DOI: 10.1016/j.jinorgbio.2004.08.020] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2004] [Revised: 08/25/2004] [Accepted: 08/30/2004] [Indexed: 01/12/2023]
Abstract
The [Ru(II)(Hedta)NO(+)] complex is a diamagnetic species crystallizing in a distorted octahedral geometry, with the Ru-N(O) length 1.756(4) A and the RuNO angle 172.3(4) degrees . The complex contains one protonated carboxylate (pK(a)=2.7+/-0.1). The [Ru(II)(Hedta)NO(+)] complex undergoes a nitrosyl-centered one-electron reduction (chemical or electrochemical), with E(NO+/NO)=-0.31 V vs SCE (I=0.2 M, pH 1), yielding [Ru(II)(Hedta)NO](-), which aquates slowly: k(-NO)=2.1+/-0.4x10(-3) s(-1) (pH 1.0, I=0.2 M, CF(3)COOH/NaCF(3)COO, 25 degrees C). At pHs>12, the predominant species, [Ru(II)(edta)NO](-), reacts according to [Ru(II)(edta)NO](-)+2OH(-)-->[Ru(II)(edta)NO(2)](3-), with K(eq)=1.0+/-0.4 x 10(3) M(-2) (I=1.0 M, NaCl; T=25.0+/-0.1 degrees C). The rate-law is first order in each of the reactants for most reaction conditions, with k(OH(-))=4.35+/-0.02 M(-1)s(-1) (25.0 degrees C), assignable mechanistically to the elementary step comprising the attack of one OH(-) on [Ru(II)(edta)NO](-), with subsequent fast deprotonation of the [Ru(II)(edta)NO(2)H](2-) intermediate. The activation parameters were DeltaH(#)=60+/-1 kJ/mol, DeltaS(#)=-31+/-3 J/Kmol, consistent with a nucleophilic addition process between likely charged ions. In the toxicity up-and-down tests performed with Swiss mice, no death was observed in all the doses administered (3-9.08 x 10(-5) mol/kg). The biodistribution tests performed with Wistar male rats showed metal in the liver, kidney, urine and plasma. Eight hours after the injection no metal was detected in the samples. The vasodilator effect of [Ru(II)(edta)NO](-) was studied in aortic rings without endothelium, and was compared with sodium nitroprusside (SNP). The times of maximal effects of [Ru(II)(edta)NO](-) and SNP were 2 h and 12 min, respectively, suggesting that [Ru(II)(edta)NO](-) releases NO slowly to the medium in comparison with SNP.
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Affiliation(s)
- Patrícia Graça Zanichelli
- Instituto de Química de São Carlos, Universidade de São Paulo, Av. Trabalhador São Carlense, CEP: 13560-970, São Carlos, SP, Brazil
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Abstract
The reaction kinetics of a set of ruthenium nitrosyl complexes, {(X)5MNO}n, containing different coligands X (polypyridines, NH3, EDTA, pz, and py) with cysteine (excess conditions), were studied by UV-vis spectrophotometry, using stopped-flow techniques, at an appropriate pH, in the range 3-10, and T = 25 degrees C. The selection of coligands afforded a redox-potential range from -0.3 to +0.5 V (vs Ag/AgCl) for the NO+/NO bound couples. Two intermediates were detected. The first one, I1, appears in the range 410-470 nm for the different complexes and is proposed to be a 1:1 adduct, with the S atom of the cysteinate nucleophile bound to the N atom of nitrosyl. The adduct formation step of I1 is an equilibrium, and the kinetic rate constants for the formation and dissociation of the corresponding adducts were determined by studying the cysteine-concentration dependence of the formation rates. The second intermediate, I2, was detected through the decay of I1, with a maximum absorbance at ca. 380 nm. From similar kinetic results and analyses, we propose that a second cysteinate adds to I1 to form I2. By plotting ln k1(RS-) and ln k2(RS-) for the first and second adduct formation steps, respectively, against the redox potentials of the NO+/NO couples, linear free energy plots are obtained, as previously observed with OH- as a nucleophile. The addition rates for both processes increase with the nitrosyl redox potentials, and this reflects a more positive charge at the electrophilic N atom. In a third step, the I2 adducts decay to form the corresponding Ru-aqua complexes, with the release of N2O and formation of cystine, implying a two-electron process for the overall nitrosyl reduction. This is in contrast with the behavior of nitroprusside ([Fe(CN)5NO]2-; NP), which always yields the one-electron reduction product, [Fe(CN)5NO]3-, either under substoichiometric or in excess-cysteine conditions.
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Affiliation(s)
- Federico Roncaroli
- Departamento de Química Inorgánica, Analítica y Química Física-INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires-CONICET, Pabellón 2, Ciudad Universitaria, Buenos Aires C1428EHA, Argentina
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Grossi L, D'Angelo S. Sodium nitroprusside: mechanism of NO release mediated by sulfhydryl-containing molecules. J Med Chem 2005; 48:2622-6. [PMID: 15801852 DOI: 10.1021/jm049857n] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Sodium nitroprusside (SNP) is among the most widely studied nitric oxide donors, and its capability of producing NO seems to depend on its interaction with sulfhydryl-containing molecules present in vivo. The aim of this research has been the study of the mechanism of interaction between SNP and sulfhydryl-containing compounds, such as cysteine and glutathione, through detection by EPR, UV-vis, and IR spectroscopy of both the radical and nonradical species involved. An electron-transfer process can be invoked as the key step, which leads to the formation of the reduced SNP radical, the main detectable radical intermediate, and the corresponding S-nitrosothiol, the ending product of NO that can be considered the real storage and transporters of NO. When cysteine was used, a second radical species (A) is detectable: it can be accounted for by the interaction of a byproduct with unreacted cysteine.
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Affiliation(s)
- Loris Grossi
- Dipartimento di Chimica Organica "A. Mangini", Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy
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Roncaroli F, van Eldik R, Olabe JA. Release of NO from Reduced Nitroprusside Ion. Iron-Dinitrosyl Formation and NO-Disproportionation Reactions. Inorg Chem 2005; 44:2781-90. [PMID: 15819566 DOI: 10.1021/ic050070c] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The kinetics and mechanism of the thermal decomposition of the one-electron reduction product of [Fe(CN)(5)NO](2-) (nitroprusside ion, NP) have been studied by using UV-vis, IR, and EPR spectroscopy and mass-spectrometric and electrochemical techniques in the pH range of 4-10. The reduction product contains an equilibrium mixture of [Fe(CN)(4)NO](2-) and [Fe(CN)(5)NO](3-) ions. The first predominates at pH <8 and is formed by the rapid release of trans-cyanide from [Fe(CN)(5)NO](3-), which, in turn, is the main component at pH >9-10. Both nitrosyl complexes decay by first-order processes with rate constants around 10(-5) s(-1) (pH 6-10) related to the dissociation of NO. The decomposition is enhanced at pH 4 by 2 orders of magnitude with protons (and also metal ions) favoring the release of cyanides from the [Fe(CN)(4)NO](2-) ions and the ensuing rapid delivery of NO. At pH 7, an EPR-silent intermediate I(1) is detected (nu(NO), 1695 and 1740 cm(-1)) and assigned to the trans-[Fe(II)(CN)(4)(NO)(2)](2-) ion, an {Fe(NO)(2)}(8) species. At pH 6-8, I(1) induces a disproportionation process with formation of N(2)O and the regeneration of nitroprusside in a 1:2 molar ratio. At lower pHs, I(1) leads, competitively, to a second paramagnetic (S = 1/2) dinitrosyl intermediate I(2), [Fe(CN)(2)(NO)(2)](1-), a new member of a series of four-coordinate {Fe(L)(2)(NO)(2)} complexes (L = thiolates, imidazole, etc.), described as {Fe(NO)(2)}(9). Other decomposition products are hexacyanoferrate(II) or free cyanide, depending on the pH, and precipitates of the Prussian-Blue type. This study throws light on the conditions favoring rapid release of NO, to promote vasodilatory effects upon NP injection, and describes new processes related to dinitrosyl formation and NO disproportionation, which are also relevant to the diverse biological processes associated with NO and N(2)O processing.
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Affiliation(s)
- Federico Roncaroli
- Department of Inorganic, Analytical and Physical Chemistry, INQUIMAE, Faculty of Exact and Natural Sciences, University of Buenos Aires, C1428EHA Buenos Aires, Argentina
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Ford PC, Laverman LE. Reaction mechanisms relevant to the formation of iron and ruthenium nitric oxide complexes. Coord Chem Rev 2005. [DOI: 10.1016/j.ccr.2004.04.006] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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OLABE JOSÉA. REDOX REACTIVITY OF COORDINATED LIGANDS IN PENTACYANO(L)FERRATE COMPLEXES. ADVANCES IN INORGANIC CHEMISTRY 2004. [DOI: 10.1016/s0898-8838(03)55002-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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