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Juarez-Martinez Y, Labra-Vázquez P, Lacroix PG, Tassé M, Mallet-Ladeira S, Pimienta V, Malfant I. Photorelease of Nitric Oxide (NO) in Mono- and Bimetallic Ruthenium Nitrosyl Complexes: A Photokinetic Investigation with a Two-Step Model. Inorg Chem 2024; 63:7665-7677. [PMID: 38623892 DOI: 10.1021/acs.inorgchem.3c04496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
Two monometallic and three bimetallic ruthenium acetonitrile (RuMeCN) complexes are presented and fully characterized. All of them are built from the same skeleton [FTRu(bpy)(MeCN)]2+, in which FT is a fluorenyl-substituted terpyridine ligand and bpy is the 2,2'-bipyridine. The crystal structure of [FTRu(bpy)(MeCN)](PF6)2 is presented. A careful spectroscopic analysis allows establishing that these 5 RuMeCN complexes can be identified as the product of the photoreaction of 5 related RuNO complexes, investigated as efficient nitric oxide (NO) donors. Based on this set of complexes, the mechanism of the NO photorelease of the bimetallic complexes has been established through a complete investigation under irradiations performed at 365, 400, 455, and 490 nm wavelength. A two-step (A → B → C) kinetic model specially designed for this purpose provides a good description of the mechanism, with quantum yields of photorelease in the range 0.001-0.029, depending on the irradiation wavelength. In the first step of release, the quantum yields (ϕAB) are always found to be larger than those of the second step (ϕBC), at any irradiation wavelengths.
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Affiliation(s)
- Yael Juarez-Martinez
- Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, F-31077 Toulouse, France
| | - Pablo Labra-Vázquez
- Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, F-31077 Toulouse, France
| | - Pascal G Lacroix
- Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, F-31077 Toulouse, France
| | - Marine Tassé
- Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, F-31077 Toulouse, France
| | - Sonia Mallet-Ladeira
- Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, F-31077 Toulouse, France
- Institut de Chimie de Toulouse (ICT, UAR 2599), 118 Route de Narbonne, 31062 Toulouse Cedex 09, France
| | - Véronique Pimienta
- Laboratoire SOFTMAT, Université Toulouse III, 118 Rte de Narbonne, 31062 Toulouse, France
| | - Isabelle Malfant
- Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, F-31077 Toulouse, France
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2
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Kulbir, Das S, Devi T, Ghosh S, Chandra Sahoo S, Kumar P. Acid-induced nitrite reduction of nonheme iron(ii)-nitrite: mimicking biological Fe-NiR reactions. Chem Sci 2023; 14:2935-2942. [PMID: 36937601 PMCID: PMC10016336 DOI: 10.1039/d2sc06704h] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 02/14/2023] [Indexed: 02/25/2023] Open
Abstract
Nitrite reductase (NiR) catalyzes nitrite (NO2 -) to nitric oxide (NO) transformation in the presence of an acid (H+ ions/pH) and serves as a critical step in NO biosynthesis. In addition to the NiR enzyme, NO synthases (NOSs) participate in NO production. The chemistry involved in the catalytic reduction of NO2 -, in the presence of H+, generates NO with a H2O molecule utilizing two H+ + one electron from cytochromes and is believed to be affected by the pH. Here, to understand the effect of H+ ions on NO2 - reduction, we report the acid-induced NO2 - reduction chemistry of a nonheme FeII-nitrito complex, [(12TMC)FeII(NO2 -)]+ (FeII-NO2 -, 2), with variable amounts of H+. FeII-NO2 - upon reaction with one-equiv. of acid (H+) generates [(12TMC)Fe(NO)]2+, {FeNO}7 (3) with H2O2 rather than H2O. However, the amount of H2O2 decreases with increasing equivalents of H+ and entirely disappears when H+ reaches ≅ two-equiv. and shows H2O formation. Furthermore, we have spectroscopically characterized and followed the formation of H2O2 (H+ = one-equiv.) and H2O (H+ ≅ two-equiv.) and explained why bio-driven NiR reactions end with NO and H2O. Mechanistic investigations, using 15N-labeled-15NO2 - and 2H-labeled-CF3SO3D (D+ source), revealed that the N atom in the {Fe14/15NO}7 is derived from the NO2 - ligand and the H atom in H2O or H2O2 is derived from the H+ source, respectively.
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Affiliation(s)
- Kulbir
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Tirupati 517507 India
| | - Sandip Das
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Tirupati 517507 India
| | - Tarali Devi
- Humboldt-Universität zu Berlin, Institut für Chemie Brook-Taylor-Straße 2 D-12489 Berlin Germany
| | - Somnath Ghosh
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Tirupati 517507 India
| | | | - Pankaj Kumar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Tirupati 517507 India
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3
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Lehnert N, Kim E, Dong HT, Harland JB, Hunt AP, Manickas EC, Oakley KM, Pham J, Reed GC, Alfaro VS. The Biologically Relevant Coordination Chemistry of Iron and Nitric Oxide: Electronic Structure and Reactivity. Chem Rev 2021; 121:14682-14905. [PMID: 34902255 DOI: 10.1021/acs.chemrev.1c00253] [Citation(s) in RCA: 92] [Impact Index Per Article: 30.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Nitric oxide (NO) is an important signaling molecule that is involved in a wide range of physiological and pathological events in biology. Metal coordination chemistry, especially with iron, is at the heart of many biological transformations involving NO. A series of heme proteins, nitric oxide synthases (NOS), soluble guanylate cyclase (sGC), and nitrophorins, are responsible for the biosynthesis, sensing, and transport of NO. Alternatively, NO can be generated from nitrite by heme- and copper-containing nitrite reductases (NIRs). The NO-bearing small molecules such as nitrosothiols and dinitrosyl iron complexes (DNICs) can serve as an alternative vehicle for NO storage and transport. Once NO is formed, the rich reaction chemistry of NO leads to a wide variety of biological activities including reduction of NO by heme or non-heme iron-containing NO reductases and protein post-translational modifications by DNICs. Much of our understanding of the reactivity of metal sites in biology with NO and the mechanisms of these transformations has come from the elucidation of the geometric and electronic structures and chemical reactivity of synthetic model systems, in synergy with biochemical and biophysical studies on the relevant proteins themselves. This review focuses on recent advancements from studies on proteins and model complexes that not only have improved our understanding of the biological roles of NO but also have provided foundations for biomedical research and for bio-inspired catalyst design in energy science.
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Affiliation(s)
- Nicolai Lehnert
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Eunsuk Kim
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Hai T Dong
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Jill B Harland
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Andrew P Hunt
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Elizabeth C Manickas
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Kady M Oakley
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - John Pham
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Garrett C Reed
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Victor Sosa Alfaro
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
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4
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Parkin G. Impact of the coordination of multiple Lewis acid functions on the electronic structure and v n configuration of a metal center. Dalton Trans 2021; 51:411-427. [PMID: 34931650 DOI: 10.1039/d1dt02921e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The covalent bond classification (CBC) method represents a molecule as MLlXxZz by evaluating the total number of L, X and Z functions interacting with M. The CBC method is a simplistic approach that is based on the notion that the bonding of a ligating atom (or group of atoms) can be expressed in terms of the number of electrons it contributes to a 2-electron bond. In many cases, the bonding in a molecule of interest can be described in terms of a 2-center 2-electron bonding model and the MLlXxZz classification can be derived straightforwardly by considering each ligand independently. However, the bonding within a molecule cannot always be described satisfactorily by using a 2-center 2-electron model and, in such situations, the MLlXxZz classification requires a more detailed consideration than one in which each ligand is treated in an independent manner. The purpose of this article is to provide examples of how the MLlXxZz classification is obtained in the presence of multicenter bonding interactions. Specific emphasis is given to the treatment of multiple π-acceptor ligands and the impact on the vn configuration, i.e. the number of formally nonbonding electrons on an element of interest.
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Affiliation(s)
- Gerard Parkin
- Department of Chemistry, Columbia University, New York, New York 10027, USA.
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5
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Vanin AF. The Free-Radical Nature of Nitric Oxide Molecules as a Determinant of their Conversion to Nitrosonium Cations in Living Systems. Biophysics (Nagoya-shi) 2020. [DOI: 10.1134/s0006350920030239] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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6
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Ahmed AA. Structural and electronic properties of the adsorption of nitric oxide molecule on copper clusters CuN(N = 1–7): A DFT study. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137543] [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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7
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Lancaster JR. Historical origins of the discovery of mammalian nitric oxide (nitrogen monoxide) production/physiology/pathophysiology. Biochem Pharmacol 2020; 176:113793. [PMID: 31923387 DOI: 10.1016/j.bcp.2020.113793] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 01/06/2020] [Indexed: 12/24/2022]
Abstract
The award of the 1998 Nobel Prize in Physiology or Medicine to Robert F. Furchgott, Louis J. Ignarro, and Ferid Murad "for their discoveries concerning nitric oxide as a signaling molecule in the cardiovascular system" highlighted the discovery of NO in mammals. This breakthrough also coincided with the discoveries of the role of NO as a cytotoxic effector in the immune system and as an intercellular neurotransmitter in the nervous system. This brief overview describes the chronological development of this trilinear convergence in 1986-1988, including background chemistry and history of human/nitrogen oxide interactions in general.
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Affiliation(s)
- Jack R Lancaster
- Department of Pharmacology & Chemical Biology University of Pittsburgh School of Medicine, 200 Lothrop St., Pittsburgh, PA 15261, USA.
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8
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Ghosh A, Conradie J. Stereochemistry of Transition-Metal Dinitrosyl Complexes. A Molecular Orbital Rationale for the Attracto and Repulso Conformations. Inorg Chem 2019; 58:5943-5948. [DOI: 10.1021/acs.inorgchem.9b00266] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Abhik Ghosh
- Department of Chemistry, University of Tromsø, N-9037 Tromsø, Norway
| | - Jeanet Conradie
- Department of Chemistry, University of Tromsø, N-9037 Tromsø, Norway
- Department of Chemistry, University of the Free State, 9300 Bloemfontein, Republic of South Africa
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9
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Alvarez MA, García ME, García-Vivó D, Ramos A, Ruiz MA, Toyos A. N-O Bond Activation and Cleavage Reactions of the Nitrosyl-Bridged Complexes [M 2Cp 2(μ-PCy 2)(μ-NO)(NO) 2] (M = Mo, W). Inorg Chem 2018; 57:15314-15329. [PMID: 30461277 DOI: 10.1021/acs.inorgchem.8b02647] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The title complexes (1a,b) were prepared in two steps by first reacting the hydrides [M2Cp2(μ-H)(μ-PCy2)(CO)4] with [NO](BF4) in the presence of Na2CO3 to give dinitrosyls [M2Cp2(μ-PCy2)(CO)2(NO)2](BF4), which were then fully decarbonylated upon reaction with NaNO2 at 323 K. An isomer of the Mo2 complex having a cisoid arrangement of the terminal ligands ( cis-1a) was prepared upon irradiation of toluene solutions of 1a with visible-UV light at 288 K. The structure of these trinitrosyl complexes was investigated using X-ray diffraction and density functional theory (DFT) calculations, these revealing a genuine pyramidalization of the bridging NO that might be associated in part to an increase of charge at the N atom and anticipated a weakening of the N-O bond upon reaction with bases or reducing reagents. Complexes 1a,b reacted with [FeCp2](BF4) to give first the radicals [M2Cp2(μ-PCy2)(μ-NO)(NO)2](BF4) according to CV experiments, which then underwent H-abstraction to yield the nitroxyl-bridged complexes [M2Cp2(μ-PCy2)(μ-κ1:η2-HNO)(NO)2](BF4), alternatively prepared upon protonation with HBF4·OEt2. The novel coordination mode of the nitroxyl ligand in these products was thermodynamically favored over its tautomeric hydroximido form, according to DFT calculations, and similar nitrosomethane-bridged cations [M2Cp2(μ-PCy2)( μ-κ1:η2-MeNO)(NO)2]+ were prepared by reacting 1a,b with CF3SO3Me or [Me3O]BF4. Complexes 1 reacted with M(Hg) (M = Zn, Na) in tetrahydrofuran to give the amido-bridged derivatives [M2Cp2(μ-PCy2)(μ-NH2)(NO)2] with retention of stereochemistry, a transformation also induced by using mild O atom scavengers such as CO and phosphites in the presence of water. In the absence of water, phosphites accomplished a deoxygenation of the bridging NO of the Mo2 complexes to yield the phosphoraniminato-bridged derivatives [Mo2Cp2(μ-PCy2){μ-NP(OR)3}(NO)2] (R = Et, Ph), also with retention of stereochemistry.
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Affiliation(s)
- M Angeles Alvarez
- Departamento de Química Orgánica e Inorgánica/IUQOEM , Universidad de Oviedo , E-33071 Oviedo , Spain
| | - M Esther García
- Departamento de Química Orgánica e Inorgánica/IUQOEM , Universidad de Oviedo , E-33071 Oviedo , Spain
| | - Daniel García-Vivó
- Departamento de Química Orgánica e Inorgánica/IUQOEM , Universidad de Oviedo , E-33071 Oviedo , Spain
| | - Alberto Ramos
- Departamento de Química Orgánica e Inorgánica/IUQOEM , Universidad de Oviedo , E-33071 Oviedo , Spain
| | - Miguel A Ruiz
- Departamento de Química Orgánica e Inorgánica/IUQOEM , Universidad de Oviedo , E-33071 Oviedo , Spain
| | - Adrián Toyos
- Departamento de Química Orgánica e Inorgánica/IUQOEM , Universidad de Oviedo , E-33071 Oviedo , Spain
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10
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Ghosh P, Ding S, Quiroz M, Bhuvanesh N, Hsieh CH, Palacios PM, Pierce BS, Darensbourg MY, Hall MB. Structural and Electronic Responses to the Three Redox Levels of Fe(NO)N 2 S 2 -Fe(NO) 2. Chemistry 2018; 24:16003-16008. [PMID: 30216575 DOI: 10.1002/chem.201804168] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Indexed: 11/10/2022]
Abstract
The nitrosylated diiron complexes, Fe2 (NO)3 , of this study are interpreted as a mono-nitrosyl Fe(NO) unit, MNIU, within an N2 S2 ligand field that serves as a metallodithiolate ligand to a dinitrosyl iron unit, DNIU. The cationic Fe(NO)N2 S2 ⋅Fe(NO)2 + complex, 1+ , of Enemark-Feltham electronic notation {Fe(NO)}7 -{Fe(NO)2 }9 , is readily obtained via myriad synthetic routes, and shown to be spin coupled and diamagnetic. Its singly and doubly reduced forms, {Fe(NO)}7 -{Fe(NO)2 }10 , 10 , and {Fe(NO)}8 -{Fe(NO)2 }10 , 1- , were isolated and characterized. While structural parameters of the DNIU are largely unaffected by redox levels, the MNIU readily responds; the neutral, S= 1 / 2 , complex, 10 , finds the extra electron density added into the DNIU affects the adjacent MNIU as seen by the decrease its Fe-N-O angle (from 171° to 149°). In contrast, addition of the second electron, now into the MNIU, returns the Fe-N-O angle to 171° in 1- . Compensating shifts in FeMNIU distances from the N2 S2 plane (from 0.518 to 0.551 to 0.851 Å) contribute to the stability of the bimetallic complex. These features are addressed by computational studies which indicate that the MNIU in 1- is a triplet-state {Fe(NO)}8 with strong spin polarization in the more linear FeNO unit. Magnetic susceptibility and parallel mode EPR results are consistent with the triplet state assignment.
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Affiliation(s)
- Pokhraj Ghosh
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX, 77843, USA
| | - Shengda Ding
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX, 77843, USA
| | - Manuel Quiroz
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX, 77843, USA
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX, 77843, USA
| | - Chung-Hung Hsieh
- Department of Chemistry, Tamkang Univesrity, New Taipei City, 25157, Taiwan
| | - Philip M Palacios
- Department of Chemistry, University of Texas at Arlington, 503 W 3rd St, Arlington, TX, 76010, USA
| | - Brad S Pierce
- Department of Chemistry, University of Texas at Arlington, 503 W 3rd St, Arlington, TX, 76010, USA
| | - Marcetta Y Darensbourg
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX, 77843, USA
| | - Michael B Hall
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX, 77843, USA
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11
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Demissie TB, Conradie J, Vazquez-Lima H, Ruud K, Ghosh A. Rare and Nonexistent Nitrosyls: Periodic Trends and Relativistic Effects in Ruthenium and Osmium Porphyrin-Based {MNO} 7 Complexes. ACS OMEGA 2018; 3:10513-10516. [PMID: 31459176 PMCID: PMC6645279 DOI: 10.1021/acsomega.8b01434] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2018] [Accepted: 08/14/2018] [Indexed: 05/26/2023]
Abstract
Relativistic and nonrelativistic density functional theory calculations were used to investigate rare or nonexistent ruthenium and osmium analogues of nitrosylhemes. Strong ligand field effects and, to a lesser degree, relativistic effects were found to destabilize {RuNO}7 porphyrins relative to their {FeNO}7 analogues. Substantially stronger relativistic effects account for the even greater instability and/or nonexistence of {OsNO}7 porphyrin derivatives.
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Affiliation(s)
- Taye B. Demissie
- Department
of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Tromsø—The Arctic University
of Norway, N-9037 Tromsø, Norway
- Materials
Science Program, Department of Chemistry, Addis Ababa University, Addis
Ababa, Ethiopia
| | - Jeanet Conradie
- Department
of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Tromsø—The Arctic University
of Norway, N-9037 Tromsø, Norway
- Department
of Chemistry, University of the Free State, P.O. Box 339, 9300 Bloemfontein, Republic of South Africa
| | - Hugo Vazquez-Lima
- Department
of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Tromsø—The Arctic University
of Norway, N-9037 Tromsø, Norway
| | - Kenneth Ruud
- Department
of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Tromsø—The Arctic University
of Norway, N-9037 Tromsø, Norway
| | - Abhik Ghosh
- Department
of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Tromsø—The Arctic University
of Norway, N-9037 Tromsø, Norway
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12
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The reactions of RuCl3(NO)(PPh3)2 and RuCl3(NO)·H2O with Ph2P(CH2) P(O)Ph2, n = 1, 2, or 3: Crystal structures of ruthenium nitrosyl complexes containing monodentate and chelating Ph2P(CH2) P(O)Ph2 ligands. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.01.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Alvarez MA, García ME, García-Vivó D, Ruiz MA, Toyos A. E-H Bond Activation and Insertion Processes in the Reactions of the Unsaturated Hydride [W 2Cp 2(μ-H)(μ-PPh 2)(NO) 2]. Inorg Chem 2018; 57:2228-2241. [PMID: 29411970 DOI: 10.1021/acs.inorgchem.7b03111] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reactions of the title complex (1) with different p-block element (E) molecules was examined. Compound 1 reacted with BH3·THF at room temperature to give the trihydride [W2Cp2(μ-H)H2(μ-PPh2)(NO)2], which formally results from hydrogenation of 1, a reaction that actually does not take place when neat dihydrogen is used. Clean E-H bond oxidative addition, however, took place when 1 was reacted with HSnPh3, to give the related dihydride stannyl derivative [W2Cp2(μ-H)H(μ-PPh2)(NO)2(SnPh3)]. In contrast, the reaction of 1 with HSPh involved H2 elimination to give the thiolate-bridged complex [W2Cp2(μ-SPh)(μ-PPh2)(NO)2], while that with (p-tol)C(O)H resulted in insertion of the aldehyde to yield the related alkoxide complex [W2Cp2{μ-OCH2(p-tol)}(μ-PPh2)(NO)2]. Insertion also prevailed in the reactions of 1 with CNtBu, which, however, involved the competitive formation of new C-H or N-H bonds, to give a mixture of formimidoyl and aminocarbyne derivatives, [W2Cp2(μ-κ1:η2-HCNtBu)(μ-PPh2)(NO)2] (W-W = 3.0177(2) Å) and [W2Cp2{μ-C(NHtBu)}(μ-PPh2)(NO)2] (W-W = 2.9010(4) Å), respectively, even though the latter was thermodynamically preferred, according to density functional theory calculations. The former represents the first structurally characterized complex displaying a formimidoyl or iminoacyl ligand in the alkenyl-like μ-κ1:η2 coordination mode. The reaction of 1 with diazomethane proceeded with N2 elimination and C-H coupling to yield the agostic methyl-bridged complex [W2Cp2(μ-κ1:η2-CH3)(μ-PPh2)(NO)2] (calculated W-W = 2.923 Å), whereas the reaction with N2CH(SiMe3) proceeded with insertion of the diazoalkane to give the corresponding hydrazonide complex [W2Cp2{μ-NH(NCHSiMe3)}(μ-PPh2)(NO)2] (W-W = 2.8608(4) Å). The latter was converted under alkaline conditions to the methyldiazenide derivative [W2Cp2{μ-N(NMe)}(μ-PPh2)(NO)2] (W-W = 2.8730(2) Å), in a process involving hydrolysis of the C-Si bond coupled with a 1,3-H shift from N to C.
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Affiliation(s)
- M Angeles Alvarez
- Departamento de Química Orgánica e Inorgánica/IUQOEM, Universidad de Oviedo , E-33071 Oviedo, Spain
| | - M Esther García
- Departamento de Química Orgánica e Inorgánica/IUQOEM, Universidad de Oviedo , E-33071 Oviedo, Spain
| | - Daniel García-Vivó
- Departamento de Química Orgánica e Inorgánica/IUQOEM, Universidad de Oviedo , E-33071 Oviedo, Spain
| | - Miguel A Ruiz
- Departamento de Química Orgánica e Inorgánica/IUQOEM, Universidad de Oviedo , E-33071 Oviedo, Spain
| | - Adrián Toyos
- Departamento de Química Orgánica e Inorgánica/IUQOEM, Universidad de Oviedo , E-33071 Oviedo, Spain
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14
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Alemayehu AB, Vazquez-Lima H, Gagnon KJ, Ghosh A. Stepwise Deoxygenation of Nitrite as a Route to Two Families of Ruthenium Corroles: Group 8 Periodic Trends and Relativistic Effects. Inorg Chem 2017; 56:5285-5294. [PMID: 28422487 DOI: 10.1021/acs.inorgchem.7b00377] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Given the many applications of ruthenium porphyrins, the rarity of ruthenium corroles and the underdeveloped state of their chemistry are clearly indicative of an area ripe for significant breakthroughs. The tendency of ruthenium corroles to form unreactive metal-metal-bonded dimers has been recognized as a key impediment in this area. Herein, by exposing free-base meso-tris(p-X-phenyl)corroles, H3[TpXPC] (X = CF3, H, Me, and OMe), and [Ru(COD)Cl2]x in refluxing 2-methoxyethanol to nitrite, we have been able to reliably intercept the series Ru[TpXPC](NO) in a matter of seconds to minutes and subsequently RuVI[TpXPC](N), the products of a second deoxygenation, over some 16 h. Two of the RuVIN complexes and one ruthenium corrole dimer could be crystallographically analyzed; the Ru-Nnitrido distance was found to be ∼1.61 Å, consistent with the triple-bonded character of the RuVIN units and essentially identical with the Os-Nnitrido distance in analogous osmium corroles. Spectroscopic and density functional theory (DFT) calculations suggest that the RuNO corroles are best viewed as innocent {RuNO}6 complexes, whereas the analogous FeNO corroles are noninnocent, i.e., best viewed as {FeNO}7-corrole•2-. Both RuVIN and OsVIN corroles exhibit sharp Soret bands, suggestive of an innocent macrocycle. A key difference between the two metals is that the Soret maxima of the OsVIN corroles are red-shifted some 25 nm relative to those of the RuVIN complexes. Careful time-dependent DFT studies indicate that this difference is largely attributable to relativistic effects in OsVIN corroles. The availability of two new classes of mononuclear ruthenium corroles potentially opens the door to new applications, in such areas as catalysis and cancer therapy.
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Affiliation(s)
- Abraham B Alemayehu
- Department of Chemistry and Center for Theoretical and Computational Chemistry, UiT-The Arctic University of Norway , N-9037 Tromsø, Norway
| | - Hugo Vazquez-Lima
- Department of Chemistry and Center for Theoretical and Computational Chemistry, UiT-The Arctic University of Norway , N-9037 Tromsø, Norway
| | - Kevin J Gagnon
- Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, California 94720-8229, United States
| | - Abhik Ghosh
- Department of Chemistry and Center for Theoretical and Computational Chemistry, UiT-The Arctic University of Norway , N-9037 Tromsø, Norway
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Piñeiro-López L, Ortega-Villar N, Muñoz MC, Molnár G, Cirera J, Moreno-Esparza R, Ugalde-Saldívar VM, Bousseksou A, Ruiz E, Real JA. Electronic Structure Modulation in an Exceptionally Stable Non-Heme Nitrosyl Iron(II) Spin-Crossover Complex. Chemistry 2016; 22:12741-51. [DOI: 10.1002/chem.201601172] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Lucía Piñeiro-López
- Instituto de Ciencia Molecular (ICMol); Universidad de Valencia; 46980 Paterna Valencia Spain
| | - Norma Ortega-Villar
- Facultad de Química (UNAM); Edificio B.; Av. Universidad 3000, Coyoacán México D.F. 04510 México
| | - M. Carmen Muñoz
- Departamento de Física Aplicada; Universitat Politècnica de València; 46022 Valencia Spain
| | - Gábor Molnár
- LCC; CNRS & Université de Toulouse (UPS, INP); 205 route de Narbonne 31077 Toulouse France
| | - Jordi Cirera
- Departament de Química Inorgànica i Orgànica; Secció de Química Inorgànica; Institut de Recerca de Química Teòrica i Computacional; Universitat de Barcelona; Diagonal 645 Barcelona 08028 Spain
| | - Rafael Moreno-Esparza
- Facultad de Química (UNAM); Edificio B.; Av. Universidad 3000, Coyoacán México D.F. 04510 México
| | | | - Azzedine Bousseksou
- LCC; CNRS & Université de Toulouse (UPS, INP); 205 route de Narbonne 31077 Toulouse France
| | - Eliseo Ruiz
- Departament de Química Inorgànica i Orgànica; Secció de Química Inorgànica; Institut de Recerca de Química Teòrica i Computacional; Universitat de Barcelona; Diagonal 645 Barcelona 08028 Spain
| | - José A. Real
- Instituto de Ciencia Molecular (ICMol); Universidad de Valencia; 46980 Paterna Valencia Spain
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16
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Ding S, Hall MB. The Rich Structural Chemistry Displayed by the Carbon Monoxide as a Ligand to Metal Complexes. THE CHEMICAL BOND I 2016. [DOI: 10.1007/430_2015_208] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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17
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Strassner T. Professor D.M.P. Mingos FRS. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.07.020] [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]
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