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Meng Z, Stolz RM, De Moraes LS, Jones CG, Eagleton AM, Nelson HM, Mirica KA. Gas-Induced Electrical and Magnetic Modulation of Two-Dimensional Conductive Metal-Organic Framework. Angew Chem Int Ed Engl 2024; 63:e202404290. [PMID: 38589297 DOI: 10.1002/anie.202404290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 04/03/2024] [Accepted: 04/04/2024] [Indexed: 04/10/2024]
Abstract
Controlled modulation of electronic and magnetic properties in stimuli-responsive materials provides valuable insights for the design of magnetoelectric or multiferroic devices. This paper demonstrates the modulation of electrical and magnetic properties of a semiconductive, paramagnetic metal-organic framework (MOF) Cu3(C6O6)2 with small gaseous molecules, NH3, H2S, and NO. This study merges chemiresistive and magnetic tests to reveal that the MOF undergoes simultaneous changes in electrical conductance and magnetization that are uniquely modulated by each gas. The features of response, including direction, magnitude, and kinetics, are modulated by the physicochemical properties of the gaseous molecules. This study advances the design of multifunctional materials capable of undergoing simultaneous changes in electrical and magnetic properties in response to chemical stimuli.
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Affiliation(s)
- Zheng Meng
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, NH 03755, USA
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China
| | - Robert M Stolz
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, NH 03755, USA
| | - Lygia Silva De Moraes
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California, 91125, USA
| | - Christopher G Jones
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California, 91125, USA
| | - Aileen M Eagleton
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, NH 03755, USA
| | - Hosea M Nelson
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California, 91125, USA
| | - Katherine A Mirica
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, NH 03755, USA
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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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Hofmann L, Altmann LM, Fischer O, Prusko L, Xiao G, Westwood NJ, Heinrich MR. Cleavage of Organosolv Lignin to Phenols Using Nitrogen Monoxide and Hydrazine. ACS OMEGA 2021; 6:19400-19408. [PMID: 34368527 PMCID: PMC8340100 DOI: 10.1021/acsomega.1c00996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 07/01/2021] [Indexed: 06/13/2023]
Abstract
From the variety of methods known for the depolymerization of organosolv lignin, a broad range of diversely substituted aromatic compounds are available today. In the present work, a novel two-step reaction sequence is reported, which is focused on the formation of phenols. While the first step of the depolymerization strategy comprises the 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ)-catalyzed oxidation of organosolv lignin with nitrogen monoxide so that two waste materials are combined, cleavage to the phenolic target compounds is achieved in the second step employing hydrazine and potassium hydroxide under Wolff-Kishner-type conditions. Besides the fact that the novel strategy proceeds via an untypical form of oxidized organosolv lignin, the two-step sequence is further able to provide phenols as cleavage products, which bear no substituent at the 4-position.
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Affiliation(s)
- Laura
Elena Hofmann
- Department
of Chemistry and Pharmacy, Pharmaceutical Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
| | - Lisa-Marie Altmann
- Department
of Chemistry and Pharmacy, Pharmaceutical Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
| | - Oliver Fischer
- Department
of Chemistry and Pharmacy, Pharmaceutical Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
| | - Lea Prusko
- Department
of Chemistry and Pharmacy, Pharmaceutical Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
| | - Ganyuan Xiao
- School
of Chemistry and Biomedical Sciences Research Complex, University of St. Andrews and EaStCHEM North Haugh, St Andrews KY16 9ST, Fife, United Kingdom
| | - Nicholas J. Westwood
- School
of Chemistry and Biomedical Sciences Research Complex, University of St. Andrews and EaStCHEM North Haugh, St Andrews KY16 9ST, Fife, United Kingdom
| | - Markus R. Heinrich
- Department
of Chemistry and Pharmacy, Pharmaceutical Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
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4
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Truzzi DR, Medeiros NM, Augusto O, Ford PC. Dinitrosyl Iron Complexes (DNICs). From Spontaneous Assembly to Biological Roles. Inorg Chem 2021; 60:15835-15845. [PMID: 34014639 DOI: 10.1021/acs.inorgchem.1c00823] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Dinitrosyl iron complexes (DNICs) are spontaneously and rapidly generated in cells. Their assembly requires nitric oxide (NO), biothiols, and nonheme iron, either labile iron or iron-sulfur clusters. Despite ubiquitous detection by electron paramagnetic resonance in NO-producing cells, the DNIC's chemical biology remains only partially understood. In this Forum Article, we address the reaction mechanisms for endogenous DNIC formation, with a focus on a labile iron pool as the iron source. The capability of DNICs to promote S-nitrosation is discussed in terms of S-nitrosothiol generation associated with the formation and chemical reactivity of DNICs. We also highlight how elucidation of the chemical reactivity and the dynamics of DNICs combined with the development of detection/quantification methods can provide further information regarding their participation in physiological and pathological processes.
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Affiliation(s)
- Daniela R Truzzi
- Departamento de Bioquímica, Instituto de Química de São Paulo, Universidade de São Paulo, Caixa Postal 26077, CEP05513-970 São Paulo, São Paulo, Brazil
| | - Nathalia M Medeiros
- Departamento de Bioquímica, Instituto de Química de São Paulo, Universidade de São Paulo, Caixa Postal 26077, CEP05513-970 São Paulo, São Paulo, Brazil
| | - Ohara Augusto
- Departamento de Bioquímica, Instituto de Química de São Paulo, Universidade de São Paulo, Caixa Postal 26077, CEP05513-970 São Paulo, São Paulo, Brazil
| | - Peter C Ford
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, Santa Barbara, California 93106-9510, United States
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5
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Pereira ES, Rodrigues GLS, Rocha WR. Electronic structure and mechanism for the uptake of nitric oxide by the Ru(iii) antitumor complex NAMI-A. RSC Adv 2021; 11:7381-7390. [PMID: 35423255 PMCID: PMC8695036 DOI: 10.1039/d0ra10622d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 02/05/2021] [Indexed: 11/24/2022] Open
Abstract
Nitric oxide (NO) has well known vasodilation effects in living organisms and its participation in the metastasis of cancer cells through the angiogenesis process has been demonstrated experimentally. Therefore, the uptake of NO has become one focus of investigation to produce anti-metastatic drugs. In this article we have investigated the uptake of NO by the ruthenium based metallodrug trans-tetrachloride(dimethylsulfoxide)imidazole ruthenate(iii) [Im]trans-[RuCl4(Im)(DMSO)], known as New Anti-tumor Metastasis Inhibitor-A (NAMI-A). Electronic structure calculations using Density Functional Theory, DFT, and State-Averaged Complete Active Space Self Consistent Field, SA-CASSCF, with second order perturbation theory corrections, NEVPT2 were carried out to investigate the mechanism involved in the uptake of NO by the Ru-based anticancer metallodrug NAMI-A. The calculations revealed that the reaction takes place at the triplet potential energy surface, with the singlet surface being ∼15 kcal mol-1 shifted to higher energies, and there is a surface crossing to form the most stable singlet product after the reaction takes place at the triplet surface. The spin pairing and electron transfer from the nitric oxide to the metallic fragment takes place at the region of the minimum energy crossing point between the two surfaces. The Ru-NO bond in the {Ru-NO}6 product has ∼10% of the RuIII-NO0 character. The SA-CASSCF/NEVPT2 calculations revealed that the uptake of NO by NAMI-A has a small energy barrier of ∼8 kcal mol-1 and, therefore a rate constant of 11.3 × 106 s-1 at 300 K. In addition, the reaction is thermodynamically favorable, with a Gibbs free energy of ∼30 kcal mol-1. These results show that the uptake of nitric oxide by the NAMI-A complex is kinetically and thermodynamically feasible in biological medium and, therefore, gives support to the anti-angiogenesis theory associated to the mode of action of NAMI-A and other related compounds.
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Affiliation(s)
- Eufrásia S Pereira
- Laboratório de Estudos Computacionais em Sistemas Moleculares, eCsMolab, Departamento de Química, ICEx, Universidade Federal de Minas Gerais 31270-901 Pampulha Belo Horizonte MG Brazil
| | - Gabriel L S Rodrigues
- Laboratório de Estudos Computacionais em Sistemas Moleculares, eCsMolab, Departamento de Química, ICEx, Universidade Federal de Minas Gerais 31270-901 Pampulha Belo Horizonte MG Brazil
| | - Willian R Rocha
- Laboratório de Estudos Computacionais em Sistemas Moleculares, eCsMolab, Departamento de Química, ICEx, Universidade Federal de Minas Gerais 31270-901 Pampulha Belo Horizonte MG Brazil
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6
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The solution chemistry of nitric oxide and other reactive nitrogen species. Nitric Oxide 2020; 103:31-46. [DOI: 10.1016/j.niox.2020.07.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 07/14/2020] [Accepted: 07/16/2020] [Indexed: 12/17/2022]
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7
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Truzzi DR, Augusto O, Iretskii AV, Ford PC. Dynamics of Dinitrosyl Iron Complex (DNIC) Formation with Low Molecular Weight Thiols. Inorg Chem 2019; 58:13446-13456. [DOI: 10.1021/acs.inorgchem.9b02338] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Daniela R. Truzzi
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106-9510, United States
- Departamento de Bioquímica, Instituto de Química de São Paulo, Universidade de São Paulo, Caixa Postal 26077, CEP05513-970 São Paulo, SP, Brasil
| | - Ohara Augusto
- Departamento de Bioquímica, Instituto de Química de São Paulo, Universidade de São Paulo, Caixa Postal 26077, CEP05513-970 São Paulo, SP, Brasil
| | - Alexei V. Iretskii
- Department of Chemistry and Environmental Sciences, Lake Superior State University, Sault Sainte Marie, Michigan 49783 United States
| | - Peter C. Ford
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106-9510, United States
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8
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Hong S, Yan JJ, Karmalkar DG, Sutherlin KD, Kim J, Lee YM, Goo Y, Mascharak PK, Hedman B, Hodgson KO, Karlin KD, Solomon EI, Nam W. A mononuclear nonheme {FeNO} 6 complex: synthesis and structural and spectroscopic characterization. Chem Sci 2018; 9:6952-6960. [PMID: 30210769 PMCID: PMC6124912 DOI: 10.1039/c8sc01962b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 07/18/2018] [Indexed: 01/19/2023] Open
Abstract
While the synthesis and characterization of {FeNO}7,8,9 complexes have been well documented in heme and nonheme iron models, {FeNO}6 complexes have been less clearly understood. Herein, we report the synthesis and structural and spectroscopic characterization of mononuclear nonheme {FeNO}6 and iron(iii)-nitrito complexes bearing a tetraamido macrocyclic ligand (TAML), such as [(TAML)FeIII(NO)]- and [(TAML)FeIII(NO2)]2-, respectively. First, direct addition of NO(g) to [FeIII(TAML)]- results in the formation of [(TAML)FeIII(NO)]-, which is sensitive to moisture and air. The spectroscopic data of [(TAML)FeIII(NO)]-, such as 1H nuclear magnetic resonance and X-ray absorption spectroscopies, combined with computational study suggest the neutral nature of nitric oxide with a diamagnetic Fe center (S = 0). We also provide alternative pathways for the generation of [(TAML)FeIII(NO)]-, such as the iron-nitrite reduction triggered by protonation in the presence of ferrocene, which acts as an electron donor, and the photochemical iron-nitrite reduction. To the best of our knowledge, the present study reports the first photochemical nitrite reduction in nonheme iron models.
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Affiliation(s)
- Seungwoo Hong
- Department of Chemistry and Nano Science , Ewha Womans University , Seoul 03760 , Korea . .,Department of Chemistry , Sookmyung Women's University , Seoul 04310 , Korea
| | - James J Yan
- Department of Chemistry , Stanford University , Stanford , California 94305 , USA .
| | - Deepika G Karmalkar
- Department of Chemistry and Nano Science , Ewha Womans University , Seoul 03760 , Korea .
| | - Kyle D Sutherlin
- Department of Chemistry , Stanford University , Stanford , California 94305 , USA .
| | - Jin Kim
- 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 .
| | - Yire Goo
- Department of Chemistry and Nano Science , Ewha Womans University , Seoul 03760 , Korea .
| | - Pradip K Mascharak
- Department of Chemistry and Biochemistry , University of California , Santa Cruz , California 95064 , USA
| | - Britt Hedman
- Stanford Synchrotron Radiation Lightsource , SLAC National Accelerator Laboratory , Stanford University , California 94025 , USA . ;
| | - Keith O Hodgson
- Department of Chemistry , Stanford University , Stanford , California 94305 , USA . .,Stanford Synchrotron Radiation Lightsource , SLAC National Accelerator Laboratory , Stanford University , California 94025 , USA . ;
| | - Kenneth D Karlin
- Department of Chemistry , The Johns Hopkins University , Baltimore , Maryland 21218 , USA .
| | - Edward I Solomon
- Department of Chemistry , Stanford University , Stanford , California 94305 , USA . .,Stanford Synchrotron Radiation Lightsource , SLAC National Accelerator Laboratory , Stanford University , California 94025 , USA . ;
| | - Wonwoo Nam
- Department of Chemistry and Nano Science , Ewha Womans University , Seoul 03760 , Korea . .,School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710119 , P. R. China
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9
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Kollau A, Russwurm M, Neubauer A, Rechberger G, Schmidt K, Koesling D, Fassett J, Schrammel A, Mayer B. Scavenging of nitric oxide by hemoglobin in the tunica media of porcine coronary arteries. Nitric Oxide 2016; 54:8-14. [PMID: 26805578 PMCID: PMC5933522 DOI: 10.1016/j.niox.2016.01.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Revised: 01/19/2016] [Accepted: 01/20/2016] [Indexed: 11/23/2022]
Abstract
Scavenging of nitric oxide (NO) often interferes with studies on NO signaling in cell-free preparations. We observed that formation of cGMP by NO-stimulated purified soluble guanylate cyclase (sGC) was virtually abolished in the presence of cytosolic preparations of porcine coronary arteries, with the scavenging activity localized in the tunica media (smooth muscle layer). Electrochemical measurement of NO release from a donor compound and light absorbance spectroscopy showed that cytosolic preparations contained a reduced heme protein that scavenged NO. This protein, which reacted with anti-human hemoglobin antibodies, was efficiently removed from the preparations by haptoglobin affinity chromatography. The cleared cytosols showed only minor scavenging of NO according to electrochemical measurements and did not decrease cGMP formation by NO-stimulated sGC. In contrast, the column flow-through caused a nearly 2-fold increase of maximal sGC activity (from 33.1 ± 1.6 to 54.9 ± 2.2 μmol × min(-1) × mg(-1)). The proteins retained on the affinity column were identified as hemoglobin α and β subunits. The results indicate that hemoglobin, presumably derived from vasa vasorum erythrocytes, is present and scavenges NO in preparations of porcine coronary artery smooth muscle. Selective removal of hemoglobin-mediated scavenging unmasked stimulation of maximal NO-stimulated sGC activity by a soluble factor expressed in vascular tissue.
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Affiliation(s)
- Alexander Kollau
- Institute of Pharmaceutical Sciences, Department of Pharmacology and Toxicology, University of Graz, Austria
| | - Michael Russwurm
- Department of Pharmacology and Toxicology, Ruhr University Bochum, Germany
| | - Andrea Neubauer
- Institute of Pharmaceutical Sciences, Department of Pharmacology and Toxicology, University of Graz, Austria
| | - Gerald Rechberger
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Austria; Omics-Center, BioTechMed-Graz, Austria
| | - Kurt Schmidt
- Institute of Pharmaceutical Sciences, Department of Pharmacology and Toxicology, University of Graz, Austria
| | - Doris Koesling
- Department of Pharmacology and Toxicology, Ruhr University Bochum, Germany
| | - John Fassett
- Institute of Pharmaceutical Sciences, Department of Pharmacology and Toxicology, University of Graz, Austria
| | - Astrid Schrammel
- Institute of Pharmaceutical Sciences, Department of Pharmacology and Toxicology, University of Graz, Austria
| | - Bernd Mayer
- Institute of Pharmaceutical Sciences, Department of Pharmacology and Toxicology, University of Graz, Austria.
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11
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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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12
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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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13
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Pereira JCM, Iretskii AV, Han RM, Ford PC. Dinitrosyl Iron Complexes with Cysteine. Kinetics Studies of the Formation and Reactions of DNICs in Aqueous Solution. J Am Chem Soc 2014; 137:328-36. [DOI: 10.1021/ja510393q] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- José Clayston Melo Pereira
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, Santa
Barbara, California 93106-9510, United States
- Departamento
de Química Geral e Inorgânica, Instituto de Química
de Araraquara, UNESP − Universidade Estadual Paulista, Araraquara, São Paulo 14801−970, Brazil
| | - Alexei V. Iretskii
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, Santa
Barbara, California 93106-9510, United States
- Department
of Chemistry and Environmental Sciences, Lake Superior State University, Sault Sainte Marie, Michigan 49783, United States
| | - Rui-Min Han
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, Santa
Barbara, California 93106-9510, United States
- Department
of Chemistry, Renmin University of China, 59 ZhongGuanCun St., Beijing, 100872, China
| | - Peter C. Ford
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, Santa
Barbara, California 93106-9510, United States
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