101
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Hong S, Kumar P, Cho KB, Lee YM, Karlin KD, Nam W. Mechanistic Insight into the Nitric Oxide Dioxygenation Reaction of Nonheme Iron(III)-Superoxo and Manganese(IV)-Peroxo Complexes. Angew Chem Int Ed Engl 2016; 55:12403-7. [PMID: 27593390 DOI: 10.1002/anie.201605705] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 07/25/2016] [Indexed: 12/14/2022]
Abstract
Reactions of nonheme Fe(III) -superoxo and Mn(IV) -peroxo complexes bearing a common tetraamido macrocyclic ligand (TAML), namely [(TAML)Fe(III) (O2 )](2-) and [(TAML)Mn(IV) (O2 )](2-) , with nitric oxide (NO) afford the Fe(III) -NO3 complex [(TAML)Fe(III) (NO3 )](2-) and the Mn(V) -oxo complex [(TAML)Mn(V) (O)](-) plus NO2 (-) , respectively. Mechanistic studies, including density functional theory (DFT) calculations, reveal that M(III) -peroxynitrite (M=Fe and Mn) species, generated in the reactions of [(TAML)Fe(III) (O2 )](2-) and [(TAML)Mn(IV) (O2 )](2-) with NO, are converted into M(IV) (O) and (.) NO2 species through O-O bond homolysis of the peroxynitrite ligand. Then, a rebound of Fe(IV) (O) with (.) NO2 affords [(TAML)Fe(III) (NO3 )](2-) , whereas electron transfer from Mn(IV) (O) to (.) NO2 yields [(TAML)Mn(V) (O)](-) plus NO2 (-) .
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Affiliation(s)
- Seungwoo Hong
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul, 03760, Korea
| | - Pankaj Kumar
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul, 03760, Korea
| | - Kyung-Bin Cho
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul, 03760, Korea
| | - Yong-Min Lee
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul, 03760, Korea
| | | | - Wonwoo Nam
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul, 03760, Korea.
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102
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Hong S, Kumar P, Cho KB, Lee YM, Karlin KD, Nam W. Mechanistic Insight into the Nitric Oxide Dioxygenation Reaction of Nonheme Iron(III)-Superoxo and Manganese(IV)-Peroxo Complexes. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605705] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Seungwoo Hong
- Department of Chemistry and Nano Science; Ewha Womans University; Seoul 03760 Korea
| | - Pankaj Kumar
- Department of Chemistry and Nano Science; Ewha Womans University; Seoul 03760 Korea
| | - Kyung-Bin Cho
- Department of Chemistry and Nano Science; Ewha Womans University; Seoul 03760 Korea
| | - Yong-Min Lee
- Department of Chemistry and Nano Science; Ewha Womans University; Seoul 03760 Korea
| | | | - Wonwoo Nam
- Department of Chemistry and Nano Science; Ewha Womans University; Seoul 03760 Korea
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103
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Huh DN, Czer ET, Cordova KE, Chow WI, Moore CE, Rheingold AL, Daley CJ. Metal nitrosyl chemistry: Interesting oxidation and nitrosylation of a metal-bound ligand framework in a diamido-bis(phosphine) ruthenium(II) complex. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.06.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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104
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Levin N, Codesido NO, Bill E, Weyhermüller T, Segantin Gaspari AP, da Silva RS, Olabe JA, Slep LD. Structural, Spectroscopic, and Photochemical Investigation of an Octahedral NO-Releasing {RuNO}7 Species. Inorg Chem 2016; 55:7808-10. [DOI: 10.1021/acs.inorgchem.6b00719] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Natalia Levin
- Universidad de Buenos Aires, Facultad de Ciencias Exactas
y Naturales, Departamento de Química Inorgánica, Analítica
y Química Física, and INQUIMAE , CONICET, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
| | - Nicolás Osa Codesido
- Universidad de Buenos Aires, Facultad de Ciencias Exactas
y Naturales, Departamento de Química Inorgánica, Analítica
y Química Física, and INQUIMAE , CONICET, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
| | - Eckhard Bill
- Max-Planck Institut für Chemische Energiekonversion, Stiftstraße 34−36, D-45470 Mülheim an der
Ruhr, Germany
| | - Thomas Weyhermüller
- Max-Planck Institut für Chemische Energiekonversion, Stiftstraße 34−36, D-45470 Mülheim an der
Ruhr, Germany
| | - Ana Paula Segantin Gaspari
- Faculdade de Ciências
Farmacêuticas de Ribeirão Preto, Departamento de Física
e Química, Universidade de São Paulo, Avenida do Café
s/n, 14040-903 Ribeirão
Preto, São Paolo, Brazil
| | - Roberto Santana da Silva
- Faculdade de Ciências
Farmacêuticas de Ribeirão Preto, Departamento de Física
e Química, Universidade de São Paulo, Avenida do Café
s/n, 14040-903 Ribeirão
Preto, São Paolo, Brazil
| | - José A. Olabe
- Universidad de Buenos Aires, Facultad de Ciencias Exactas
y Naturales, Departamento de Química Inorgánica, Analítica
y Química Física, and INQUIMAE , CONICET, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
| | - Leonardo D. Slep
- Universidad de Buenos Aires, Facultad de Ciencias Exactas
y Naturales, Departamento de Química Inorgánica, Analítica
y Química Física, and INQUIMAE , CONICET, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
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105
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Soma S, Van Stappen C, Kiss M, Szilagyi RK, Lehnert N, Fujisawa K. Distorted tetrahedral nickel-nitrosyl complexes: spectroscopic characterization and electronic structure. J Biol Inorg Chem 2016; 21:757-75. [DOI: 10.1007/s00775-016-1366-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 06/01/2016] [Indexed: 10/21/2022]
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106
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Kumar P, Lee YM, Hu L, Chen J, Park YJ, Yao J, Chen H, Karlin KD, Nam W. Factors That Control the Reactivity of Cobalt(III)-Nitrosyl Complexes in Nitric Oxide Transfer and Dioxygenation Reactions: A Combined Experimental and Theoretical Investigation. J Am Chem Soc 2016; 138:7753-7762. [PMID: 27221953 PMCID: PMC4950881 DOI: 10.1021/jacs.6b04040] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Metal-nitrosyl complexes are key intermediates involved in many biological and physiological processes of nitric oxide (NO) activation by metalloproteins. In this study, we report the reactivities of mononuclear cobalt(III)-nitrosyl complexes bearing N-tetramethylated cyclam (TMC) ligands, [(14-TMC)Co(III)(NO)](2+) and [(12-TMC)Co(III)(NO)](2+), in NO-transfer and dioxygenation reactions. The Co(III)-nitrosyl complex bearing 14-TMC ligand, [(14-TMC)Co(III)(NO)](2+), transfers the bound nitrosyl ligand to [(12-TMC)Co(II)](2+) via a dissociative pathway, {[(14-TMC)Co(III)(NO)](2+) → {(14-TMC)Co···NO}(2+)}, thus affording [(12-TMC)Co(III)(NO)](2+) and [(14-TMC)Co(II)](2+) as products. The dissociation of NO from the [(14-TMC)Co(III)(NO)](2+) complex prior to NO-transfer is supported experimentally and theoretically. In contrast, the reverse reaction, which is the NO-transfer from [(12-TMC)Co(III)(NO)](2+) to [(14-TMC)Co(II)](2+), does not occur. In addition to the NO-transfer reaction, dioxygenation of [(14-TMC)Co(III)(NO)](2+) by O2 produces [(14-TMC)Co(II)(NO3)](+), which possesses an O,O-chelated nitrato ligand and where, based on an experiment using (18)O-labeled O2, two of the three O-atoms in the [(14-TMC)Co(II)(NO3)](+) product derive from O2. The dioxygenation reaction is proposed to occur via a dissociative pathway, as proposed in the NO-transfer reaction, and via the formation of a Co(II)-peroxynitrite intermediate, based on the observation of phenol ring nitration. In contrast, [(12-TMC)Co(III)(NO)](2+) does not react with O2. Thus, the present results demonstrate unambiguously that the NO-transfer/dioxygenation reactivity of the cobalt(III)-nitrosyl complexes bearing TMC ligands is significantly influenced by the ring size of the TMC ligands and/or the spin state of the cobalt ion.
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Affiliation(s)
- Pankaj Kumar
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| | - Yong-Min Lee
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| | - Lianrui Hu
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Jianwei Chen
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Young Jun Park
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| | - Jiannian Yao
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Hui Chen
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Kenneth D. Karlin
- Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Wonwoo Nam
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
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107
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Timmons AJ, Symes MD. Converting between the oxides of nitrogen using metal-ligand coordination complexes. Chem Soc Rev 2016; 44:6708-22. [PMID: 26158348 DOI: 10.1039/c5cs00269a] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The oxides of nitrogen (chiefly NO, NO3(-), NO2(-) and N2O) are key components of the natural nitrogen cycle and are intermediates in a range of processes of enormous biological, environmental and industrial importance. Nature has evolved numerous enzymes which handle the conversion of these oxides to/from other small nitrogen-containing species and there also exist a number of heterogeneous catalysts that can mediate similar reactions. In the chemical space between these two extremes exist metal-ligand coordination complexes that are easier to interrogate than heterogeneous systems and simpler in structure than enzymes. In this Tutorial Review, we will examine catalysts for the inter-conversions of the various nitrogen oxides that are based on such complexes, looking in particular at more recent examples that take inspiration from the natural systems.
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Affiliation(s)
- Andrew J Timmons
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK.
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108
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A motif for reversible nitric oxide interactions in metalloenzymes. Nat Chem 2016; 8:663-9. [DOI: 10.1038/nchem.2502] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 03/11/2016] [Indexed: 01/12/2023]
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109
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McQuilken AC, Matsumura H, Dürr M, Confer AM, Sheckelton JP, Siegler MA, McQueen TM, Ivanović-Burmazović I, Moënne-Loccoz P, Goldberg DP. Photoinitiated Reactivity of a Thiolate-Ligated, Spin-Crossover Nonheme {FeNO}(7) Complex with Dioxygen. J Am Chem Soc 2016; 138:3107-17. [PMID: 26919583 DOI: 10.1021/jacs.5b12741] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The nonheme iron complex, [Fe(NO)(N3PyS)]BF4, is a rare example of an {FeNO}(7) species that exhibits spin-crossover behavior. The comparison of X-ray crystallographic studies at low and high temperatures and variable-temperature magnetic susceptibility measurements show that a low-spin S = 1/2 ground state is populated at 0-150 K, while both low-spin S = 1/2 and high-spin S = 3/2 states are populated at T > 150 K. These results explain the observation of two N-O vibrational modes at 1737 and 1649 cm(-1) in CD3CN for [Fe(NO)(N3PyS)]BF4 at room temperature. This {FeNO}(7) complex reacts with dioxygen upon photoirradiation with visible light in acetonitrile to generate a thiolate-ligated, nonheme iron(III)-nitro complex, [Fe(III)(NO2)(N3PyS)](+), which was characterized by EPR, FTIR, UV-vis, and CSI-MS. Isotope labeling studies, coupled with FTIR and CSI-MS, show that one O atom from O2 is incorporated in the Fe(III)-NO2 product. The O2 reactivity of [Fe(NO)(N3PyS)]BF4 in methanol is dramatically different from CH3CN, leading exclusively to sulfur-based oxidation, as opposed to NO· oxidation. A mechanism is proposed for the NO· oxidation reaction that involves formation of both Fe(III)-superoxo and Fe(III)-peroxynitrite intermediates and takes into account the experimental observations. The stability of the Fe(III)-nitrite complex is limited, and decay of [Fe(III)(NO2)(N3PyS)](+) leads to {FeNO}(7) species and sulfur oxygenated products. This work demonstrates that a single mononuclear, thiolate-ligated nonheme {FeNO}(7) complex can exhibit reactivity related to both nitric oxide dioxygenase (NOD) and nitrite reductase (NiR) activity. The presence of the thiolate donor is critical to both pathways, and mechanistic insights into these biologically relevant processes are presented.
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Affiliation(s)
- Alison C McQuilken
- Department of Chemistry, The Johns Hopkins University , Baltimore, Maryland 21218, United States
| | - Hirotoshi Matsumura
- Oregon Health & Science University, Institute of Environmental Health, Portland, Oregon 97239, United States
| | - Maximilian Dürr
- Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg , 91058, Erlangen, Germany
| | - Alex M Confer
- Department of Chemistry, The Johns Hopkins University , Baltimore, Maryland 21218, United States
| | - John P Sheckelton
- Department of Chemistry, The Johns Hopkins University , Baltimore, Maryland 21218, United States.,Institute for Quantum Matter and Department of Physics and Astronomy, The Johns Hopkins University , Baltimore, Maryland 21218, United States
| | - Maxime A Siegler
- Department of Chemistry, The Johns Hopkins University , Baltimore, Maryland 21218, United States
| | - Tyrel M McQueen
- Department of Chemistry, The Johns Hopkins University , Baltimore, Maryland 21218, United States.,Institute for Quantum Matter and Department of Physics and Astronomy, The Johns Hopkins University , Baltimore, Maryland 21218, United States.,Department of Materials Science and Engineering, The Johns Hopkins University , Baltimore, Maryland 21218, United States
| | | | - Pierre Moënne-Loccoz
- Oregon Health & Science University, Institute of Environmental Health, Portland, Oregon 97239, United States
| | - David P Goldberg
- Department of Chemistry, The Johns Hopkins University , Baltimore, Maryland 21218, United States
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110
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Stępniewski A, Radoń M, Góra-Marek K, Broclawik E. Ammonia-modified Co(II) sites in zeolites: spin and electron density redistribution through the Co(II)-NO bond. Phys Chem Chem Phys 2016; 18:3716-29. [PMID: 26761131 DOI: 10.1039/c5cp07452e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electronic factors essential for the bonding of a non-innocent NO ligand to ammonia-modified Co(2+) sites in cobalt-exchanged zeolites are examined for small cluster models using DFT and advanced correlated wave function calculations. The analysis of charge transfer processes between the NO ligand and the cobalt center involves two protocols: valence-bond expansion of the multiconfiguration CASSCF wave function (in terms of fragment-localized active orbitals) and spin-resolved natural orbitals for chemical valence (SR-NOCV). Applicability of SR-NOCV analysis to transition metal complexes involving non-innocent fragments is critically assessed and the approach based on the CASSCF wave function turns out to be much more robust and systematic for all studied models. It is shown that the character and direction of electron density redistribution through the Co-N-O bond, quantified by relative share of the Co(II)-NO(0), Co(III)-NO(-), and Co(I)-NO(+) resonance structures in the total wave function, fully rationalize the activation of the N-O bond upon NH3 co-ligation (evidenced by calculated and measured red-shift of the NO stretching frequency and commonly ascribed to enhanced backdonation). The huge red-shift of νN-O is attributed to an effective electron transfer between the ammonia-modified Co(ii) centers and the NO antibonding π*-orbitals (related to the increased share of the Co(III)-NO(-) form). Unexpectedly, the effect is stronger for the singlet complex with three NH3 ligands than for that with five NH3 ligands bound to the cobalt center. Our results also indicate that high-efficiency electron transfers between the Co(ii) center and the NO ligand may be enabled for the selected spin state and disabled for the other spin state of the adduct. This illustrates how the cobalt center may serve to fine-tune the electronic communication between the NO ligand and its binding site.
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Affiliation(s)
- Adam Stępniewski
- Jerzy Haber Institute of Catalysis PAS, Niezapominajek 8, 30-239 Krakow, Poland.
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111
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Horgan CC, Han YS, Trueman H, Jackson CJ, Sutherland TD, Rapson TD. Phosphorescent oxygen-sensing and singlet oxygen production by a biosynthetic silk. RSC Adv 2016. [DOI: 10.1039/c6ra03731c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A recombinant coiled-coil silk was utilised to immobilise heavy-metal-macrocycles which are known to undergo efficient intersystem crossing from the singlet state to the triplet state following excitation with visible light.
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Affiliation(s)
- Conor C. Horgan
- Research School of Engineering
- The Australian National University
- Acton
- Australia
- CSIRO
| | - Yong-Shen Han
- Research School of Chemistry
- The Australian National University
- Acton
- Australia
| | | | - Colin J. Jackson
- Research School of Chemistry
- The Australian National University
- Acton
- Australia
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112
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Basudhar D, Ridnour LA, Cheng R, Kesarwala AH, Heinecke J, Wink DA. Biological signaling by small inorganic molecules. Coord Chem Rev 2016; 306:708-723. [PMID: 26688591 PMCID: PMC4680994 DOI: 10.1016/j.ccr.2015.06.001] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Small redox active molecules such as reactive nitrogen and oxygen species and hydrogen sulfide have emerged as important biological mediators that are involved in various physiological and pathophysiological processes. Advancement in understanding of cellular mechanisms that tightly regulate both generation and reactivity of these molecules is central to improved management of various disease states including cancer and cardiovascular dysfunction. Imbalance in the production of redox active molecules can lead to damage of critical cellular components such as cell membranes, proteins and DNA and thus may trigger the onset of disease. These small inorganic molecules react independently as well as in a concerted manner to mediate physiological responses. This review provides a general overview of the redox biology of these key molecules, their diverse chemistry relevant to physiological processes and their interrelated nature in cellular signaling.
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Affiliation(s)
- Debashree Basudhar
- Radiation Biology Branch, National Cancer Institute, NIH, Bethesda, MD 20892
| | - Lisa A. Ridnour
- Radiation Biology Branch, National Cancer Institute, NIH, Bethesda, MD 20892
| | - Robert Cheng
- Radiation Biology Branch, National Cancer Institute, NIH, Bethesda, MD 20892
| | - Aparna H. Kesarwala
- Radiation Oncology Branch, National Cancer Institute, NIH, Bethesda, MD 20892
| | - Julie Heinecke
- Radiation Biology Branch, National Cancer Institute, NIH, Bethesda, MD 20892
| | - David A. Wink
- Radiation Biology Branch, National Cancer Institute, NIH, Bethesda, MD 20892
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113
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Santoro G, Beltrami R, Kottelat E, Blacque O, Bogdanova AY, Zobi F. N-Nitrosamine-{cis-Re[CO]2}2+ cobalamin conjugates as mixed CO/NO-releasing molecules. Dalton Trans 2016; 45:1504-13. [DOI: 10.1039/c5dt03402g] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mixed CO/NO-releasing molecules were prepared by conjugation of the 17-electron rhenium dicarbonyl cis-[Re(CO)2Br4]2− complex to N-nitrosamine modified cyanocobalamin (B12) bio-vectors.
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Affiliation(s)
- Giuseppe Santoro
- Department of Chemistry
- University of Zürich
- CH-8057 Zürich
- Switzerland
| | - Ruben Beltrami
- Department of Chemistry
- University of Fribourg
- CH-1700 Fribourg
- Switzerland
| | - Emmanuel Kottelat
- Department of Chemistry
- University of Fribourg
- CH-1700 Fribourg
- Switzerland
| | - Olivier Blacque
- Department of Chemistry
- University of Zürich
- CH-8057 Zürich
- Switzerland
| | - Anna Yu. Bogdanova
- Institute of Veterinary Physiology
- University of Zürich
- CH-8057 Zürich
- Switzerland
| | - Fabio Zobi
- Department of Chemistry
- University of Fribourg
- CH-1700 Fribourg
- Switzerland
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114
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Martin-Trasanco R, Cao R, Montforts FP. Self-assembly of a Ru(II)-deuteroporphyrin lipoic acid derivative on Au(111) surfaces. J PORPHYR PHTHALOCYA 2015. [DOI: 10.1142/s1088424615500704] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The synthesis of a new carbonyl ruthenium(II) deuteroporphyrin-IX lipoic acid derivative (Ru(PLip)(CO)) (4) and its self-assembly on Au(111) surfaces were accomplished. Ru(PLip)(CO) 4 was prepared by reduction of the ester groups of carbonyl-ruthenium(II) deuteroporphyrindimethylester 1 and further esterification with D,L-α-lipoic acid 3. The self-assembly of Ru(PLip)(CO) 4 was confirmed by X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry (CV). The S2p XP spectrum of SAM formed by Ru(PLip)(CO) showed the S2p3/2 peak at 162.4 eV which corresponds to thiolated species bounded to gold. The influence of the interaction of porphyrin moieties on SAM stability was studied. The reductive desorption voltammogram of Ru(PLip)(CO) 4 self-assembled on gold showed an intense reduction peak at -1.02 V while when pyridine was coordinated to the central ruthenium(II) the reductive desorption peak was shifted to -0.85 V. The capacity of the modified Ru(PLip)(CO) gold electrode to detect nitric oxide (NO) was investigated by cyclic voltammetry. An irreversible reduction peak which increased with time on NO exposure was registered at -0.69 V indicating NO coordination to ruthenium(II).
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Affiliation(s)
- Rudy Martin-Trasanco
- Laboratorio de Química Bioinorgánica, Facultad de Química, Universidad de La Habana, La Habana 10400, Cuba
- Centro de Nanociencias Aplicadas (CENAP), Doctorado de Fisicoquímica Molecular, Universidad Andres Bello, Av. República 275, Santiago 8370146, Chile
| | - Roberto Cao
- Laboratorio de Química Bioinorgánica, Facultad de Química, Universidad de La Habana, La Habana 10400, Cuba
| | - Franz-Peter Montforts
- Institute of Organic Chemistry and Analytical Chemistry, FB2 University of Bremen, Leobener Strasse NW2/C, 28359, Bremen, Germany
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115
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Wang Z, Mitch WA. Influence of Dissolved Metals on N-Nitrosamine Formation under Amine-based CO2 Capture Conditions. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:11974-11981. [PMID: 26335609 DOI: 10.1021/acs.est.5b03085] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
As the prime contender for postcombustion CO2 capture technology, amine-based scrubbing has to address the concerns over the formation of potentially carcinogenic N-nitrosamine byproducts from reactions between flue gas NOx and amine solvents. This bench-scale study evaluated the influence of dissolved metals on the potential to form total N-nitrosamines in the solvent within the absorber unit and upon a pressure-cooker treatment that mimics desorber conditions. Among six transition metals tested for the benchmark solvent monoethanolamine (MEA), dissolved Cu promoted total N-nitrosamine formation in the absorber unit at concentrations permitted in drinking water, but not the desorber unit. The Cu effect increased with oxygen concentration. Variation of the amine structural characteristics (amine order, steric hindrance, -OH group substitution and alkyl chain length) indicated that Cu promotes N-nitrosamine formation from primary amines with hydroxyl or carboxyl groups (amino acids), but not from secondary amines, tertiary amines, sterically hindered primary amines, or amines without oxygenated groups. Ethylenediaminetetraacetate (EDTA) suppressed the Cu effect. The results suggested that the catalytic effect of Cu may be associated with the oxidative degradation of primary amines in the absorber unit, a process known to produce a wide spectrum of secondary amine products that are more readily nitrosatable than the pristine primary amines, and that can form stable N-nitrosamines. This study highlighted an intriguing linkage between amine degradation (operational cost) and N-nitrosamine formation (health hazards), all of which are challenges for commercial-scale CO2 capture technology.
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Affiliation(s)
- Zimeng Wang
- Department of Civil and Environmental Engineering, Stanford University , Stanford, California 94305, United States
| | - William A Mitch
- Department of Civil and Environmental Engineering, Stanford University , Stanford, California 94305, United States
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116
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Thomas DD, Heinecke JL, Ridnour LA, Cheng RY, Kesarwala AH, Switzer CH, McVicar DW, Roberts DD, Glynn S, Fukuto JM, Wink DA, Miranda KM. Signaling and stress: The redox landscape in NOS2 biology. Free Radic Biol Med 2015; 87:204-25. [PMID: 26117324 PMCID: PMC4852151 DOI: 10.1016/j.freeradbiomed.2015.06.002] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Revised: 06/01/2015] [Accepted: 06/02/2015] [Indexed: 01/31/2023]
Abstract
Nitric oxide (NO) has a highly diverse range of biological functions from physiological signaling and maintenance of homeostasis to serving as an effector molecule in the immune system. However, deleterious as well as beneficial roles of NO have been reported. Many of the dichotomous effects of NO and derivative reactive nitrogen species (RNS) can be explained by invoking precise interactions with different targets as a result of concentration and temporal constraints. Endogenous concentrations of NO span five orders of magnitude, with levels near the high picomolar range typically occurring in short bursts as compared to sustained production of low micromolar levels of NO during immune response. This article provides an overview of the redox landscape as it relates to increasing NO concentrations, which incrementally govern physiological signaling, nitrosative signaling and nitrosative stress-related signaling. Physiological signaling by NO primarily occurs upon interaction with the heme protein soluble guanylyl cyclase. As NO concentrations rise, interactions with nonheme iron complexes as well as indirect modification of thiols can stimulate additional signaling processes. At the highest levels of NO, production of a broader range of RNS, which subsequently interact with more diverse targets, can lead to chemical stress. However, even under such conditions, there is evidence that stress-related signaling mechanisms are triggered to protect cells or even resolve the stress. This review therefore also addresses the fundamental reactions and kinetics that initiate signaling through NO-dependent pathways, including processes that lead to interconversion of RNS and interactions with molecular targets.
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Affiliation(s)
- Douglas D Thomas
- Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Julie L Heinecke
- Radiation Biology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Lisa A Ridnour
- Radiation Biology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Robert Y Cheng
- Radiation Biology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Aparna H Kesarwala
- Radiation Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Christopher H Switzer
- Radiation Biology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Daniel W McVicar
- Cancer and Inflammation Program, National Cancer Institute-Frederick, Frederick, MD 21702, USA
| | - David D Roberts
- Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Sharon Glynn
- Prostate Cancer Institute, NUI Galway, Ireland, USA
| | - Jon M Fukuto
- Department of Chemistry, Sonoma State University, Rohnert Park, CA 94928, USA
| | - David A Wink
- Radiation Biology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
| | - Katrina M Miranda
- Department of Chemistry, University of Arizona, 1306 E. University Blvd., Tucson, AZ 85721, USA.
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117
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Becker T, Kupfer S, Wolfram M, Görls H, Schubert US, Anslyn EV, Dietzek B, Gräfe S, Schiller A. Sensitization of NO-Releasing Ruthenium Complexes to Visible Light. Chemistry 2015; 21:15554-63. [DOI: 10.1002/chem.201502091] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 08/18/2015] [Indexed: 11/05/2022]
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118
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Zhang TT, Liu YD, Zhong RG. Iron(II) porphyrins induced conversion of nitrite into nitric oxide: A computational study. J Inorg Biochem 2015; 150:126-32. [DOI: 10.1016/j.jinorgbio.2015.06.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 05/27/2015] [Accepted: 06/02/2015] [Indexed: 01/26/2023]
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119
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Alahakoon AU, Jayasena DD, Ramachandra S, Jo C. Alternatives to nitrite in processed meat: Up to date. Trends Food Sci Technol 2015. [DOI: 10.1016/j.tifs.2015.05.008] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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120
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Decréau RA, Collman JP. Three toxic gases meet in the mitochondria. Front Physiol 2015; 6:210. [PMID: 26347655 PMCID: PMC4542460 DOI: 10.3389/fphys.2015.00210] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Accepted: 07/13/2015] [Indexed: 12/14/2022] Open
Abstract
The rationale of the study was two-fold: (i) develop a functional synthetic model of the Cytochrome c oxidase (CcO) active site, (ii) use it as a convenient tool to understand or predict the outcome of the reaction of CcO with ligands (physiologically relevant gases and other ligands). At physiological pH and potential, the model catalyzes the 4-electron reduction of oxygen. This model was immobilized on self-assembled-monolayer (SAM) modified electrode. During catalytic oxygen reduction, electron delivery through SAMs is rate limiting, similar to the situation in CcO. This model contains all three redox-active components in CcO's active site, which are required to minimize the production of partially-reduced-oxygen-species (PROS): Fe-heme (“heme a3”) in a myoglobin-like model fitted with a proximal imidazole ligand, and a distal tris-imidazole Copper (“CuB”) complex, where one imidazole is cross-linked to a phenol (mimicking “Tyr244”). This functional CcO model demonstrates how CcO itself might tolerate the hormone NO (which diffuses through the mitochondria). It is proposed that CuB delivers superoxide to NO bound to Fe-heme forming peroxynitrite, then nitrate that diffuses away. Another toxic gas, H2S, has exceptional biological effects: at ~80 ppm, H2S induces a state similar to hibernation in mice, lowering the animal's temperature and slowing respiration. Using our functional CcO model, we have demonstrated that at the same concentration range H2S can reversibly inhibit catalytic oxygen reduction. Such a reversible catalytic process on the model was also demonstrated with an organic compound, tetrazole (TZ). Following studies showed that TZ reversibly inhibits respiration in isolated mitochondria, and induces deactivation of platelets, a mitochondria-rich key component of blood coagulation. Hence, this program is a rare example illustrating the use of a functional model to understand and predict physiologically important reactions at the active site of CcO.
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Affiliation(s)
- Richard A Decréau
- Department of Chemistry (ICMUB Institute), University of Burgundy Franche-Comté Dijon, France ; Department of Chemistry, Stanford University Stanford, CA, USA
| | - James P Collman
- Department of Chemistry, Stanford University Stanford, CA, USA
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121
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Kim H, Chang YH, Jang WJ, Lee ES, Kim YH, Kahng SJ. Probing Single-Molecule Dissociations from a Bimolecular Complex NO-Co-Porphyrin. ACS NANO 2015; 9:7722-7728. [PMID: 26172541 DOI: 10.1021/acsnano.5b03466] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Axial coordinations of diatomic NO molecules to metalloporphyrins play key roles in dynamic processes of biological functions such as blood pressure control and immune response. Probing such reactions at the single molecule level is essential to understand their physical mechanisms but has been rarely performed. Here we report on our single molecule dissociation experiments of diatomic NO from NO-Co-porphyrin complexes describing its dissociation mechanisms. Under tunneling junctions of scanning tunneling microscope, both positive and negative energy pulses gave rise to dissociations of NO with threshold voltages, +0.68 and -0.74 V at 0.1 nA tunneling current on Au(111). From the observed power law relations between dissociation rate and tunneling current, we argue that the dissociations were inelastically induced with molecular orbital resonances by stochastically tunneling electrons, which is supported with our density functional theory calculations. Our study shows that single molecule dissociation experiments can be used to probe reaction mechanisms in a variety of axial coordinations between small molecules and metalloporphyrins.
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Affiliation(s)
- Howon Kim
- †Department of Physics, Korea University, 1-5 Anam-dong, Seongbuk-gu, Seoul, 136-713, Republic of Korea
| | - Yun Hee Chang
- ‡Graduate School of Nanoscience and Technology, KAIST, Daejeon 305-701, Republic of Korea
| | - Won-Jun Jang
- †Department of Physics, Korea University, 1-5 Anam-dong, Seongbuk-gu, Seoul, 136-713, Republic of Korea
| | - Eui-Sup Lee
- ‡Graduate School of Nanoscience and Technology, KAIST, Daejeon 305-701, Republic of Korea
| | - Yong-Hyun Kim
- ‡Graduate School of Nanoscience and Technology, KAIST, Daejeon 305-701, Republic of Korea
| | - Se-Jong Kahng
- †Department of Physics, Korea University, 1-5 Anam-dong, Seongbuk-gu, Seoul, 136-713, Republic of Korea
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122
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Sundararajan M, Neese F. Distal Histidine Modulates the Unusual O-Binding of Nitrite to Myoglobin: Evidence from the Quantum Chemical Analysis of EPR Parameters. Inorg Chem 2015; 54:7209-17. [DOI: 10.1021/acs.inorgchem.5b00557] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mahesh Sundararajan
- Theoretical Chemistry
Section, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Frank Neese
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
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123
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Barnett BR, Labios LA, Moore CE, England J, Rheingold AL, Wieghardt K, Figueroa JS. Solution Dynamics of Redox Noninnocent Nitrosoarene Ligands: Mapping the Electronic Criteria for the Formation of Persistent Metal-Coordinated Nitroxide Radicals. Inorg Chem 2015; 54:7110-21. [DOI: 10.1021/acs.inorgchem.5b01252] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Brandon R. Barnett
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093-0358, United States
| | - Liezel A. Labios
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093-0358, United States
| | - Curtis E. Moore
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093-0358, United States
| | - Jason England
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse
34−36, D-45470 Mülheim an der Ruhr, Germany
| | - Arnold L. Rheingold
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093-0358, United States
| | - Karl Wieghardt
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse
34−36, D-45470 Mülheim an der Ruhr, Germany
| | - Joshua S. Figueroa
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093-0358, United States
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124
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Fitzpatrick J, Kim E. New Synthetic Routes to Iron–Sulfur Clusters: Deciphering the Repair Chemistry of [2Fe–2S] Clusters from Mononitrosyl Iron Complexes. Inorg Chem 2015; 54:10559-67. [DOI: 10.1021/acs.inorgchem.5b00961] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Jessica Fitzpatrick
- Department
of Chemistry, Brown University, 324 Brook Street, Providence, Rhode Island 02912, United States
| | - Eunsuk Kim
- Department
of Chemistry, Brown University, 324 Brook Street, Providence, Rhode Island 02912, United States
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125
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Brozek CK, Miller JT, Stoian SA, Dincă M. NO Disproportionation at a Mononuclear Site-Isolated Fe2+ Center in Fe2+-MOF-5. J Am Chem Soc 2015; 137:7495-501. [DOI: 10.1021/jacs.5b03761] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Carl K. Brozek
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Jeffrey T. Miller
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
- Department
of Chemical Engineering, Purdue University, 480 Stadium Mall Dr., West Lafayette, Indiana 47907, United States
| | - Sebastian A. Stoian
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Mircea Dincă
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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126
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Hematian S, Kenkel I, Shubina TE, Dürr M, Liu JJ, Siegler MA, Ivanovic-Burmazovic I, Karlin KD. Nitrogen Oxide Atom-Transfer Redox Chemistry; Mechanism of NO(g) to Nitrite Conversion Utilizing μ-oxo Heme-Fe(III)-O-Cu(II)(L) Constructs. J Am Chem Soc 2015; 137:6602-15. [PMID: 25974136 DOI: 10.1021/jacs.5b02174] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
While nitric oxide (NO, nitrogen monoxide) is a critically important signaling agent, its cellular concentrations must be tightly controlled, generally through its oxidative conversion to nitrite (NO2(-)) where it is held in reserve to be reconverted as needed. In part, this reaction is mediated by the binuclear heme a3/CuB active site of cytochrome c oxidase. In this report, the oxidation of NO(g) to nitrite is shown to occur efficiently in new synthetic μ-oxo heme-Fe(III)-O-Cu(II)(L) constructs (L being a tridentate or tetradentate pyridyl/alkylamino ligand), and spectroscopic and kinetic investigations provide detailed mechanistic insights. Two new X-ray structures of μ-oxo complexes have been determined and compared to literature analogs. All μ-oxo complexes react with 2 mol equiv NO(g) to give 1:1 mixtures of discrete [(L)Cu(II)(NO2(-))](+) plus ferrous heme-nitrosyl compounds; when the first NO(g) equiv reduces the heme center and itself is oxidized to nitrite, the second equiv of NO(g) traps the ferrous heme thus formed. For one μ-oxo heme-Fe(III)-O-Cu(II)(L) compound, the reaction with NO(g) reveals an intermediate species ("intermediate"), formally a bis-NO adduct, [(NO)(porphyrinate)Fe(II)-(NO2(-))-Cu(II)(L)](+) (λmax = 433 nm), confirmed by cryo-spray ionization mass spectrometry and EPR spectroscopy, along with the observation that cooling a 1:1 mixture of [(L)Cu(II)(NO2(-))](+) and heme-Fe(II)(NO) to -125 °C leads to association and generation of the key 433 nm UV-vis feature. Kinetic-thermodynamic parameters obtained from low-temperature stopped-flow measurements are in excellent agreement with DFT calculations carried out which describe the sequential addition of NO(g) to the μ-oxo complex.
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Affiliation(s)
- Shabnam Hematian
- †Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21211, United States
| | - Isabell Kenkel
- ‡Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen 91058, Germany
| | - Tatyana E Shubina
- ‡Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen 91058, Germany
| | - Maximilian Dürr
- ‡Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen 91058, Germany
| | - Jeffrey J Liu
- †Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21211, United States
| | - Maxime A Siegler
- †Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21211, United States
| | | | - Kenneth D Karlin
- †Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21211, United States
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127
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Abstract
The coordination chemistry of metal nitrosyls has expanded rapidly in the past decades due to major advances of nitric oxide and its metal compounds in biology. This review article highlights advances made in the area of multinuclear metal nitrosyl complexes, including Roussin's salts and their ester derivatives from 2003 to present. The review article focuses on isolated multinuclear metal nitrosyl complexes and is organized into different sections by the number of metal centers and bridging ligands.
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128
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Park J, Song H, Kim Y, Eun B, Kim Y, Bae DY, Park S, Rhee YM, Kim WJ, Kim K, Lee E. N-Heterocyclic Carbene Nitric Oxide Radicals. J Am Chem Soc 2015; 137:4642-5. [DOI: 10.1021/jacs.5b01976] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Junbeom Park
- Department
of Chemistry and §Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790−784, Republic of Korea
| | - Hayoung Song
- Department
of Chemistry and §Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790−784, Republic of Korea
| | - Youngsuk Kim
- Department
of Chemistry and §Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790−784, Republic of Korea
| | - Bit Eun
- Center
for Self-Assembly and Complexity, Institute for Basic Science (IBS), Pohang 790−784, Republic of Korea
- Department
of Chemistry and §Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790−784, Republic of Korea
| | - Yonghwi Kim
- Center
for Self-Assembly and Complexity, Institute for Basic Science (IBS), Pohang 790−784, Republic of Korea
- Department
of Chemistry and §Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790−784, Republic of Korea
| | - Dae Young Bae
- Center
for Self-Assembly and Complexity, Institute for Basic Science (IBS), Pohang 790−784, Republic of Korea
- Department
of Chemistry and §Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790−784, Republic of Korea
| | - Sungho Park
- Center
for Self-Assembly and Complexity, Institute for Basic Science (IBS), Pohang 790−784, Republic of Korea
| | - Young Min Rhee
- Center
for Self-Assembly and Complexity, Institute for Basic Science (IBS), Pohang 790−784, Republic of Korea
- Department
of Chemistry and §Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790−784, Republic of Korea
| | - Won Jong Kim
- Center
for Self-Assembly and Complexity, Institute for Basic Science (IBS), Pohang 790−784, Republic of Korea
- Department
of Chemistry and §Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790−784, Republic of Korea
| | - Kimoon Kim
- Center
for Self-Assembly and Complexity, Institute for Basic Science (IBS), Pohang 790−784, Republic of Korea
- Department
of Chemistry and §Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790−784, Republic of Korea
| | - Eunsung Lee
- Center
for Self-Assembly and Complexity, Institute for Basic Science (IBS), Pohang 790−784, Republic of Korea
- Department
of Chemistry and §Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790−784, Republic of Korea
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129
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Nitric oxide reactivity of a manganese(II) complex leading to nitrosation of the ligand. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2014.12.040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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130
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Kumar P, Lee YM, Park YJ, Siegler MA, Karlin KD, Nam W. Reactions of Co(III)-nitrosyl complexes with superoxide and their mechanistic insights. J Am Chem Soc 2015; 137:4284-7. [PMID: 25793706 DOI: 10.1021/ja513234b] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
New Co(III)-nitrosyl complexes bearing N-tetramethylated cyclam (TMC) ligands, [(12-TMC)Co(III)(NO)](2+) (1) and [(13-TMC)Co(III)(NO)](2+) (2), were synthesized via [(TMC)Co(II)(CH3CN)](2+) + NO(g) reactions. Spectroscopic and structural characterization showed that these compounds bind the nitrosyl moiety in a bent end-on fashion. Complexes 1 and 2 reacted with KO2/2.2.2-cryptand to produce [(12-TMC)Co(II)(NO2)](+) (3) and [(13-TMC)Co(II)(NO2)](+) (4), respectively; these possess O,O'-chelated nitrito ligands. Mechanistic studies using (18)O-labeled superoxide ((18)O2(•-)) showed that one O atom in the nitrito ligand is derived from superoxide and the O2 produced comes from the other superoxide O atom. Evidence supporting the formation of a Co-peroxynitrite intermediate is also presented.
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Affiliation(s)
- Pankaj Kumar
- †Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| | - Yong-Min Lee
- †Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| | - Young Jun Park
- †Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| | - Maxime A Siegler
- ‡Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Kenneth D Karlin
- ‡Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Wonwoo Nam
- †Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
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131
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Freitag L, Knecht S, Keller SF, Delcey MG, Aquilante F, Pedersen TB, Lindh R, Reiher M, González L. Orbital entanglement and CASSCF analysis of the Ru-NO bond in a Ruthenium nitrosyl complex. Phys Chem Chem Phys 2015; 17:14383-92. [PMID: 25767830 PMCID: PMC4447059 DOI: 10.1039/c4cp05278a] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Multiconfigurational wavefunction analysis and entanglement measures based on von Neumann entropy shed light on the electronic structure of a Ru nitrosyl complex, in particular on the Ru–NO bond.
Complete active space self-consistent field (CASSCF) wavefunctions and an orbital entanglement analysis obtained from a density-matrix renormalisation group (DMRG) calculation are used to understand the electronic structure, and, in particular, the Ru–NO bond of a Ru nitrosyl complex. Based on the configurations and orbital occupation numbers obtained for the CASSCF wavefunction and on the orbital entropy measurements evaluated for the DMRG wavefunction, we unravel electron correlation effects in the Ru coordination sphere of the complex. It is shown that Ru–NO π bonds show static and dynamic correlation, while other Ru–ligand bonds feature predominantly dynamic correlation. The presence of static correlation requires the use of multiconfigurational methods to describe the Ru–NO bond. Subsequently, the CASSCF wavefunction is analysed in terms of configuration state functions based on localised orbitals. The analysis of the wavefunctions in the electronic singlet ground state and the first triplet state provides a picture of the Ru–NO moiety beyond the standard representation based on formal oxidation states. A distinct description of the Ru and NO fragments is advocated. The electron configuration of Ru is an equally weighted superposition of RuII and RuIII configurations, with the RuIII configuration originating from charge donation mostly from Cl ligands. However, and contrary to what is typically assumed, the electronic configuration of the NO ligand is best described as electroneutral.
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Affiliation(s)
- Leon Freitag
- Institut für theoretische Chemie, Universität Wien, Währinger Str. 17, 1090 Vienna, Austria.
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132
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Maia LB, Pereira V, Mira L, Moura JJG. Nitrite reductase activity of rat and human xanthine oxidase, xanthine dehydrogenase, and aldehyde oxidase: evaluation of their contribution to NO formation in vivo. Biochemistry 2015; 54:685-710. [PMID: 25537183 DOI: 10.1021/bi500987w] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Nitrite is presently considered a NO "storage form" that can be made available, through its one-electron reduction, to maintain NO formation under hypoxia/anoxia. The molybdoenzymes xanthine oxidase/dehydrogenase (XO/XD) and aldehyde oxidase (AO) are two of the most promising mammalian nitrite reductases, and in this work, we characterized NO formation by rat and human XO/XD and AO. This is the first characterization of human enzymes, and our results support the employment of rat liver enzymes as suitable models of the human counterparts. A comprehensive kinetic characterization of the effect of pH on XO and AO-catalyzed nitrite reduction showed that the enzyme's specificity constant for nitrite increase 8-fold, while the Km(NO2(-)) decrease 6-fold, when the pH decreases from 7.4 to 6.3. These results demonstrate that the ability of XO/AO to trigger NO formation would be greatly enhanced under the acidic conditions characteristic of ischemia. The dioxygen inhibition was quantified, and the Ki(O2) values found (24.3-48.8 μM) suggest that in vivo NO formation would be fine-tuned by dioxygen availability. The potential in vivo relative physiological relevance of XO/XD/AO-dependent pathways of NO formation was evaluated using HepG2 and HMEC cell lines subjected to hypoxia. NO formation by the cells was found to be pH-, nitrite-, and dioxygen-dependent, and the relative contribution of XO/XD plus AO was found to be as high as 50%. Collectively, our results supported the possibility that XO/XD and AO can contribute to NO generation under hypoxia inside a living human cell. Furthermore, the molecular mechanism of XO/AO-catalyzed nitrite reduction was revised.
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Affiliation(s)
- Luisa B Maia
- UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa , 2829-516 Caparica, Portugal
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133
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Wickens ZK, Guzmán PE, Grubbs RH. Aerobic palladium-catalyzed dioxygenation of alkenes enabled by catalytic nitrite. Angew Chem Int Ed Engl 2015; 54:236-40. [PMID: 25376666 PMCID: PMC4285779 DOI: 10.1002/anie.201408650] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Revised: 09/17/2014] [Indexed: 11/09/2022]
Abstract
Catalytic nitrite was found to enable carbon-oxygen bond-forming reductive elimination from unstable alkyl palladium intermediates, providing dioxygenated products from alkenes. A variety of functional groups were tolerated, and high yields (up to 94 %) were observed with many substrates, also for a multigram-scale reaction. Nitrogen dioxide, which could form from nitrite under the reaction conditions, was demonstrated to be a potential intermediate in the catalytic cycle. Furthermore, the reductive elimination event was probed with (18) O-labeling experiments, which demonstrated that both oxygen atoms in the difunctionalized products were derived from one molecule of acetic acid.
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Affiliation(s)
- Zachary K. Wickens
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena, CA 91125 (USA)
| | - Pablo E. Guzmán
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena, CA 91125 (USA)
| | - Robert H. Grubbs
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena, CA 91125 (USA)
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134
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Suzuki T, Matsumoto J, Kajita Y, Inomata T, Ozawa T, Masuda H. Nitrosyl and carbene iron complexes bearing a κ3-SNS thioamide pincer type ligand. Dalton Trans 2015; 44:1017-22. [DOI: 10.1039/c4dt03128h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The monochelate iron complex with κ3-SNS thioamide pincer ligand, [Fe(THF)2(κ3-LDPM)], gave novel complexes, [Fe(NHC)(κ3-LDPM)] and [Fe(NO)2(κ3-LDPM)], by substitution reactions with N heterocyclic carbene and NO molecules, respectively.
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Affiliation(s)
- Tatsuya Suzuki
- Department of Frontier Materials
- Graduate School of Engineering
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
| | - Jun Matsumoto
- Department of Frontier Materials
- Graduate School of Engineering
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
| | - Yuji Kajita
- Department of Applied Chemistry
- Aichi Institute of Technology
- Yakusa-cho
- Japan
| | - Tomohiko Inomata
- Department of Frontier Materials
- Graduate School of Engineering
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
| | - Tomohiro Ozawa
- Department of Frontier Materials
- Graduate School of Engineering
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
| | - Hideki Masuda
- Department of Frontier Materials
- Graduate School of Engineering
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
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135
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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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136
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Harrop TC. New Insights on {FeNO}n (n=7, 8) Systems as Enzyme Models and HNO Donors. ADVANCES IN INORGANIC CHEMISTRY 2015. [DOI: 10.1016/bs.adioch.2014.10.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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137
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Recent Progress in Photoinduced NO Delivery With Designed Ruthenium Nitrosyl Complexes. ADVANCES IN INORGANIC CHEMISTRY 2015. [DOI: 10.1016/bs.adioch.2014.11.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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138
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Wickens ZK, Guzmán PE, Grubbs RH. Aerobic Palladium‐Catalyzed Dioxygenation of Alkenes Enabled by Catalytic Nitrite. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201408650] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Zachary K. Wickens
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125 (USA)
| | - Pablo E. Guzmán
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125 (USA)
| | - Robert H. Grubbs
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125 (USA)
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139
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Kindra DR, Casely IJ, Ziller JW, Evans WJ. Nitric Oxide Insertion Reactivity with the Bismuth-Carbon Bond: Formation of the Oximate Anion, [ON(C6H2tBu2O)]−, from the Oxyaryl Dianion, (C6H2tBu2O)2−. Chemistry 2014; 20:15242-7. [DOI: 10.1002/chem.201404910] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Indexed: 11/08/2022]
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140
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Yokoyama A, Han JE, Karlin KD, Nam W. An isoelectronic NO dioxygenase reaction using a nonheme iron(III)-peroxo complex and nitrosonium ion. Chem Commun (Camb) 2014; 50:1742-4. [PMID: 24394960 DOI: 10.1039/c3cc48782b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reaction of a nonheme iron(III)-peroxo complex, [Fe(III)(14-TMC)(O2)](+), with NO(+), a transformation which is essentially isoelectronic with that for nitric oxide dioxygenases [Fe(III)(O2˙(-)) + NO], affords an iron(IV)-oxo complex, [Fe(IV)(14-TMC)(O)](2+), and nitrogen dioxide (NO2), followed by conversion to an iron(III)-nitrato complex, [Fe(III)(14-TMC)(NO3)(F)](+).
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Affiliation(s)
- Atsutoshi Yokoyama
- Department of Chemistry and Nano Science, Department of Bioinspired Science, Ewha Womans University, Seoul 120-750, Korea.
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141
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Tran CT, Williard PG, Kim E. Nitric Oxide Reactivity of [2Fe-2S] Clusters Leading to H2S Generation. J Am Chem Soc 2014; 136:11874-7. [DOI: 10.1021/ja505415c] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Camly T. Tran
- Department
of Chemistry, Brown University, 324 Brook Street, Box H, Providence, Rhode Island 02912, United States
| | - Paul G. Williard
- Department
of Chemistry, Brown University, 324 Brook Street, Box H, Providence, Rhode Island 02912, United States
| | - Eunsuk Kim
- Department
of Chemistry, Brown University, 324 Brook Street, Box H, Providence, Rhode Island 02912, United States
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142
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Staurengo-Ferrari L, Mizokami SS, Fattori V, Silva JJ, Zanichelli PG, Georgetti SR, Baracat MM, da França LG, Pavanelli WR, Casagrande R, Verri WA. The ruthenium nitric oxide donor, [Ru(HEDTA)NO], inhibits acute nociception in mice by modulating oxidative stress, cytokine production and activating the cGMP/PKG/ATP-sensitive potassium channel signaling pathway. Naunyn Schmiedebergs Arch Pharmacol 2014; 387:1053-68. [PMID: 25116441 DOI: 10.1007/s00210-014-1030-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Accepted: 07/28/2014] [Indexed: 01/22/2023]
Abstract
Nitric oxide plays an important role in various biological processes including antinociception. The control of its local concentration is crucial for obtaining the desired effect and can be achieved with exogenous nitric oxide-carriers such as ruthenium complexes. Therefore, we evaluated the analgesic effect and mechanism of action of the ruthenium nitric oxide donor [Ru(HEDTA)NO] focusing on the role of cytokines, oxidative stress and activation of the cyclic guanosine monophosphate/protein kinase G/ATP-sensitive potassium channel signaling pathway. It was observed that [Ru(HEDTA)NO] inhibited in a dose-dependent (1-10 mg/kg) manner the acetic acid-induced writhing response. At the dose of 1 mg/kg, [Ru(HEDTA)NO] inhibited the phenyl-p-benzoquinone-induced writhing response, and formalin- and complete Freund's adjuvant-induced licking and flinching responses. Systemic and local treatments with [Ru(HEDTA)NO] also inhibited the carrageenin-induced mechanical hyperalgesia and increase of myeloperoxidase activity in paw skin samples. Mechanistically, [Ru(HEDTA)NO] inhibited carrageenin-induced production of the hyperalgesic cytokines tumor necrosis factor-α and interleukin-1β, and decrease of reduced glutathione levels. Furthermore, the inhibitory effect of [Ru(HEDTA)NO] in the carrageenin-induced hyperalgesia and myeloperoxidase activity was prevented by the treatment with ODQ (soluble guanylyl cyclase inhibitor), KT5823 (protein kinase G inhibitor) and glybenclamide (ATP-sensitive potassium channel inhibitor), indicating that [Ru(HEDTA)NO] inhibits inflammatory hyperalgesia by activating the cyclic guanosine monophosphate/protein kinase G/ATP-sensitive potassium channel signaling pathway, respectively. These results demonstrate that [Ru(HEDTA)NO] exerts its analgesic effect in inflammation by inhibiting pro-nociceptive cytokine production, oxidative imbalance and activation of the nitric oxide/cyclic guanosine monophosphate/protein kinase G/ATP-sensitive potassium channel signaling pathway in mice.
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Affiliation(s)
- Larissa Staurengo-Ferrari
- Departamento de Ciências Patológicas, Centro de Ciências Biológicas, Universidade Estadual de Londrina, Rod. Celso Garcia Cid KM480 PR445, CEP 86057-970, Cx Postal 10.011, Londrina, Paraná, Brazil
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143
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Alvarez L, Suarez SA, Bikiel DE, Reboucas JS, Batinić-Haberle I, Martí MA, Doctorovich F. Redox potential determines the reaction mechanism of HNO donors with Mn and Fe porphyrins: defining the better traps. Inorg Chem 2014; 53:7351-60. [PMID: 25001488 DOI: 10.1021/ic5007082] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Azanone ((1)HNO, nitroxyl) is a highly reactive molecule with interesting chemical and biological properties. Like nitric oxide (NO), its main biologically related targets are oxygen, thiols, and metalloproteins, particularly heme proteins. As HNO dimerizes with a rate constant between 10(6) and 10(7) M(-1) s(-1), reactive studies are performed using donors, which are compounds that spontaneously release HNO in solution. In the present work, we studied the reaction mechanism and kinetics of two azanone donors Angelís Salt and toluene sulfohydroxamic acid (TSHA) with eight different Mn porphyrins as trapping agents. These porphyrins differ in their total peripheral charge (positively or negatively charged) and in their Mn(III)/Mn(II) reduction potential, showing for each case positive (oxidizing) and negative (reducing) values. Our results show that the reduction potential determines the azanone donor reaction mechanism. While oxidizing porphyrins accelerate decomposition of the donor, reducing porphyrins react with free HNO. Our results also shed light into the donor decomposition mechanism using ab initio methods and provide a thorough analysis of which MnP are the best candidates for azanone trapping and quantification experiments.
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Affiliation(s)
- Lucía Alvarez
- Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, INQUIMAE-CONICET and ‡Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria , Pab. II (1428), Buenos Aires, Argentina
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144
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Muthuraj B, Deshmukh R, Trivedi V, Iyer PK. Highly selective probe detects Cu2+ and endogenous NO gas in living cell. ACS APPLIED MATERIALS & INTERFACES 2014; 6:6562-9. [PMID: 24703409 DOI: 10.1021/am501476w] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The rapid and highly sensitive detection of extremely short-lived nitric oxide (NO) gas generated in vivo by a water-soluble fluorescein derivative is developed. This assay system comprises of indole-3-carboxaldehyde functionalized fluorescein hydrazone (FI) assay which displays a typically high absorption at 492 and 620 nm in the presence of Cu2+ and also shows FRET induced fluorescence turn-on exclusively with Cu2+. FI selectively detects Cu2+ in vivo and in vitro by the "turn-on" mechanism followed by fluorescence "turn-off" with NO gas generated by the lipopolysaccharide (LPS) action. The in vivo experiment performed in the cellular system indicates that FI loaded RAW264.7 cells showed bright fluorescence in the presence of Cu2+, while other metals did not influence the FI fluorescence. In addition, the fluorescence of FI-Cu2+ was efficiently quenched by NO generated in macrophages through LPS stimulation. FI demonstrates characteristic "turn-on" behavior in the presence of Cu2+ via spirolactom ring-opening, while other metals such as Na+, K+, Ca2+, Cr3+, Mn2+, Fe3+, Fe2+, Co2+, Ni2+, Zn2+, Cd2+, Hg2+, and Ag+ did not influence FI fluorescence even at very high concentration. Further, the FI-Cu2+ complex fluorescence was not quenched with any anions or amino acids but totally quenched by NO and the paramagnetic nature of Cu2+ ion converted into the diamagnetic nature when reduced to Cu1+. FI and the FI-Cu2+ complex are nontoxic to the cellular system and have high potential for biomedical applications.
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Affiliation(s)
- Balakrishnan Muthuraj
- Department of Chemistry, Indian Institute of Technology , Guwahati-781039, Assam, India
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145
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Freitag L, González L. Theoretical spectroscopy and photodynamics of a ruthenium nitrosyl complex. Inorg Chem 2014; 53:6415-26. [PMID: 24745977 DOI: 10.1021/ic500283y] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Photoactive transition-metal nitrosyl complexes are particularly interesting as potential drugs that deliver nitric oxide (NO) upon UV-light irradiation to be used, e.g., in photodynamic therapy. It is well-recognized that quantum-chemical calculations can guide the rational design and synthesis of molecules with specific functions. In this contribution, it is shown how electronic structure calculations and dynamical simulations can provide a unique insight into the photodissociation mechanism of NO. Exemplarily, [Ru(PaPy3)(NO)](2+) is investigated in detail, as a prototype of a particularly promising class of photoactive metal nitrosyl complexes. The ability of time-dependent density functional theory (TD-DFT) to obtain reliable excited-state energies compared with more sophisticated multiconfigurational spin-corrected calculations is evaluated. Moreover, a TD-DFT-based trajectory surface-hopping molecular dynamics study is employed to reveal the details of the radiationless decay of the molecule via internal conversion and intersystem crossing. Calculations show that the ground state of [Ru(PaPy3)(NO)](2+) includes a significant admixture of the Ru(III)(NO)(0) electronic configuration, in contrast to the previously postulated Ru(II)(NO)(+) structure of similar metal nitrosyls. Moreover, the lowest singlet and triplet excited states populate the antibonding metal d → πNO* orbitals, favoring NO dissociation. Molecular dynamics show that intersystem crossing is ultrafast (<10 fs) and dissociation is initiated in less than 50 fs. The competing relaxation to the lowest S1 singlet state takes place in less than 100 fs and thus competes with NO dissociation, which mostly takes place in the higher-lying excited triplet states. All of these processes are accompanied by bending of the NO ligand, which is not confined to any particular state.
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Affiliation(s)
- Leon Freitag
- Institut für theoretische Chemie, Universität Wien , Währinger Straße 17, 1090 Vienna, Austria
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146
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Comparison of some antioxidant properties of plant extracts from Origanum vulgare, Salvia officinalis, Eleutherococcus senticosus and Stevia rebaudiana. In Vitro Cell Dev Biol Anim 2014; 50:614-22. [DOI: 10.1007/s11626-014-9751-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Accepted: 03/17/2014] [Indexed: 10/25/2022]
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147
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Affiliation(s)
- Luisa B. Maia
- REQUIMTE/CQFB, Departamento
de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - José J. G. Moura
- REQUIMTE/CQFB, Departamento
de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
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148
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Kim S, Siegler MA, Karlin KD. Peroxynitrite chemistry derived from nitric oxide reaction with a Cu(II)-OOH species and a copper mediated NO reductive coupling reaction. Chem Commun (Camb) 2014; 50:2844-6. [PMID: 24322625 PMCID: PMC3931255 DOI: 10.1039/c3cc47942k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New peroxynitrite-copper chemistry ensues via addition of nitric oxide (˙NO(g)) to a Cu(II)-hydroperoxo species. In characterizing the system, the ligand-Cu(i) complex was shown to effect a seldom observed ˙NO(g) reductive coupling reaction. Biological implications are discussed.
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Affiliation(s)
- Sunghee Kim
- Department of Chemistry, The Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA. ; Fax: +1 410-516-8420; Tel: +1 410-516-8027
| | - Maxime A. Siegler
- Department of Chemistry, The Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA. ; Fax: +1 410-516-8420; Tel: +1 410-516-8027
| | - Kenneth D. Karlin
- Department of Chemistry, The Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA. ; Fax: +1 410-516-8420; Tel: +1 410-516-8027
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149
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Ghosh K, Kumar S, Kumar R. Ruthenium-Nitrosyl Complexes Derived from Ligands Containing Two Carboxylate Functional Groups and Studies on the Photolability of Coordinated NO. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201301225] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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150
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Yu H, Tan Z. On the kinetics of the absorption of nitric oxide into ammoniacal cobalt(II) solutions. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:2453-2463. [PMID: 24475984 DOI: 10.1021/es403901r] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Experiments were conducted using a custom double-stirred tank reactor to determine the rate constants of reactions between nitric oxide (NO) and both pentaaminecobalt(II) and hexaaminecobalt(II) at temperatures of 298.2 and 303.2 K and pH levels between 8.50 and 9.87 under atmospheric pressure. The NO concentration of simulated flue gas stream ranged from 400 to 1400 ppmv. Ammoniacal cobalt(II) solutions were prepared by adding aqueous ammonia into a cobalt(II) nitrate solution in the presence of concentrated ammonium nitrate. The reaction rate constants were calculated with an enhancement factor for gas absorption associated with parallel chemical reactions. The results showed that the reaction between NO and pentaaminecobalt(II) was first order with respect to both the NO and the pentaamminecobalt(II) ion. Similarly, the reaction between NO and hexaamminecobalt(II) was first order with respect to both the NO and the hexaamminecobalt(II) ion. The forward reaction rate constants of these two reactions were 6.43 × 10(6) and 1.00 × 10(7) L · mol(-1) · s(-1) at 298.2 K, respectively, and increased to 7.57 × 10(6) and 1.12 × 10(7) L · mol(-1) · s(-1) at 303.2 K, respectively. Ammoniacal cobalt(II) solutions also have the potential to simultaneously remove CO2, SO2, and NOx from postcombustion flue gas.
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Affiliation(s)
- Hesheng Yu
- Department of Mechanical & Mechatronics Engineering, ‡Department of Civil & Environmental Engineering, University of Waterloo , 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1
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