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Estevan F, Feliz M. Configurational landscape of chiral iron( ii) bis(phosphane) complexes. Dalton Trans 2020; 49:4528-4538. [DOI: 10.1039/c9dt04821a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An [FeH(η2-H2){Me-DuPhos}2]+ complex reacts with ethers and halides to give cis- and trans-dihydrogen substituted isomers and [FeX{Me-DuPhos}2]+ (X = Cl, I) complexes.
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Affiliation(s)
- Francisco Estevan
- Departament de Química Inorgànica
- Universitat de València
- 46100 Burjassot-Valencia
- Spain
| | - Marta Feliz
- Instituto de Tecnología Química
- Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas
- 46022 Valencia
- Spain
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2
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Kumar S, Guyon F, Knorr M, Labat S, Miqueu K, Golz C, Strohmann C. Experimental and Theoretical Studies on the Mechanism of the C–S Bond Activation of PdII Thiolate/Thioether Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00039] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sushil Kumar
- Institut
UTINAM, UMR CNRS 6213, Université Bourgogne Franche-Comté, Faculté des Sciences et des Techniques, 16 Route
de Gray, 25030 Besançon, France
| | - Fabrice Guyon
- Institut
UTINAM, UMR CNRS 6213, Université Bourgogne Franche-Comté, Faculté des Sciences et des Techniques, 16 Route
de Gray, 25030 Besançon, France
| | - Michael Knorr
- Institut
UTINAM, UMR CNRS 6213, Université Bourgogne Franche-Comté, Faculté des Sciences et des Techniques, 16 Route
de Gray, 25030 Besançon, France
| | - Stéphane Labat
- CNRS/UNIV PAU & PAYS ADOUR, Institut des Sciences Analytiques et de Physico-Chimie pour l’environnement et les Matériaux, UMR 5254, 64000 Pau, France
| | - Karinne Miqueu
- CNRS/UNIV PAU & PAYS ADOUR, Institut des Sciences Analytiques et de Physico-Chimie pour l’environnement et les Matériaux, UMR 5254, 64000 Pau, France
| | - Christopher Golz
- Technische Universität Dortmund, Anorganische Chemie, Otto-Hahn Strasse 6, 44227 Dortmund, Germany
| | - Carsten Strohmann
- Technische Universität Dortmund, Anorganische Chemie, Otto-Hahn Strasse 6, 44227 Dortmund, Germany
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3
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Affiliation(s)
- Robert H. Crabtree
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
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4
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Feliz M, Estevan F. Synthesis, Structure, and Reactivity of (Dihydrogen)(hydrido)iron(II) Complexes Bearing Chiral Diphosphanes. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201501085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Marta Feliz
- Instituto de Tecnología Química, UPV‐CSIC, Avda. De los Naranjos s/n, 46022 Valencia, Spain http://itq.upv‐csic.es/en/
| | - Francisco Estevan
- Departament de Química Inorgànica, Universitat de València, Dr. Moliner 50, 46100 Burjassot‐Valencia, Spain http://www.uv.es
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5
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Scott VJ, Labinger JA, Bercaw JE. Large Kinetic Isotope Effects for the Protonolysis of Metal–Methyl Complexes Are Not Reliable Mechanistic Indicators. Organometallics 2011. [DOI: 10.1021/om200432b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Valerie J. Scott
- Arnold and Mabel Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California 91125, United States
| | - Jay A. Labinger
- Arnold and Mabel Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California 91125, United States
| | - John E. Bercaw
- Arnold and Mabel Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California 91125, United States
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Gómez-Gallego M, Sierra MA. Kinetic isotope effects in the study of organometallic reaction mechanisms. Chem Rev 2011; 111:4857-963. [PMID: 21545118 DOI: 10.1021/cr100436k] [Citation(s) in RCA: 527] [Impact Index Per Article: 40.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Mar Gómez-Gallego
- Departamento de Química Orgánica I, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain.
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7
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Capon JF, Gloaguen F, Pétillon FY, Schollhammer P, Talarmin J. Electron and proton transfers at diiron dithiolate sites relevant to the catalysis of proton reduction by the [FeFe]-hydrogenases. Coord Chem Rev 2009. [DOI: 10.1016/j.ccr.2008.10.020] [Citation(s) in RCA: 279] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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8
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Ezzaher S, Capon JF, Dumontet N, Gloaguen F, Pétillon FY, Schollhammer P, Talarmin J. Electrochemical study of the role of a H-bridged, unsymmetrically disubstituted diiron complex in proton reduction catalysis. J Electroanal Chem (Lausanne) 2009. [DOI: 10.1016/j.jelechem.2008.12.005] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Crossland JL, Young DM, Zakharov LN, Tyler DR. Precursors to dinitrogen reduction: structures and reactivity of trans-[Fe(DMeOPrPE)2(η2-H2)H]+ and trans-[Fe(DMeOPrPE)2(N2)H]+. Dalton Trans 2009:9253-9. [DOI: 10.1039/b911066f] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Kinetic studies on the first dihydrogen aquacomplex, [Ru(H2)(H2O)5]2+: Formation under H2 pressure and catalytic H/D isotope exchange in water. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2005.06.056] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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11
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Belkova NV, Collange E, Dub P, Epstein LM, Lemenovskii DA, Lledós A, Maresca O, Maseras F, Poli R, Revin PO, Shubina ES, Vorontsov EV. Experimental and Computational Studies of Hydrogen Bonding and Proton Transfer to [Cp*Fe(dppe)H]. Chemistry 2004; 11:873-88. [PMID: 15580590 DOI: 10.1002/chem.200400700] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The present contribution reports experimental and computational investigations of the interaction between [Cp*Fe(dppe)H] and different proton donors (HA). The focus is on the structure of the proton transfer intermediates and on the potential energy surface of the proton transfer leading to the dihydrogen complex [Cp*Fe(dppe)(H2)]+. With p-nitrophenol (PNP) a UV/Visible study provides evidence of the formation of the ion-pair stabilized by a hydrogen bond between the nonclassical cation [Cp*Fe(dppe)(H2)]+ and the homoconjugated anion ([AHA]-). With trifluoroacetic acid (TFA), the hydrogen-bonded ion pair containing the simple conjugate base (A-) in equilibrium with the free ions is observed by IR spectroscopy when using a deficit of the proton donor. An excess leads to the formation of the homoconjugated anion. The interaction with hexafluoroisopropanol (HFIP) was investigated quantitatively by IR spectroscopy and by 1H and 31P NMR spectroscopy at low temperatures (200-260 K) and by stopped-flow kinetics at about room temperature (288-308 K). The hydrogen bond formation to give [Cp*Fe(dppe)H]HA is characterized by DeltaH degrees =-6.5+/-0.4 kcal mol(-1) and DeltaS degrees = -18.6+/-1.7 cal mol(-1) K(-1). The activation barrier for the proton transfer step, which occurs only upon intervention of a second HFIP molecule, is DeltaH(not equal) = 2.6+/-0.3 kcal mol(-1) and DeltaS(not equal) = -44.5+/-1.1 cal mol(-1) K(-1). The computational investigation (at the DFT/B3 LYP level with inclusion of solvent effects by the polarizable continuum model) reproduces all the qualitative findings, provided the correct number of proton donor molecules are used in the model. The proton transfer process is, however, computed to be less exothermic than observed in the experiment.
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Affiliation(s)
- Natalia V Belkova
- Nesmeyanov Institute of Organoelement Compounds (INEOS) Russian Academy of Sciences, Vavilov Street 28, 119991 Moscow, Russia
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12
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Belkova NV, Revin PO, Epstein LM, Vorontsov EV, Bakhmutov VI, Shubina ES, Collange E, Poli R. Kinetics and mechanism of the proton transfer to CpFe(dppe)H: absence of a direct protonation at the metal site. J Am Chem Soc 2003; 125:11106-15. [PMID: 12952493 DOI: 10.1021/ja0358450] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction between CpFe(dppe)H and a number of different proton donors (2-fluoroethanol, MFE; 2,2,2-trifluoroethanol, TFE; hexafluoro-2-propanol, HFIP; perfluoro-tert-butyl alcohol, PFTB; and trifluoroacetic acid, TFA) has been investigated spectroscopically by variable-temperature infrared, UV-visible, and NMR spectroscopy, and has been measured kinetically by the stopped-flow technique with UV-visible detection. The low-temperature IR study shows the establishment of hydrogen-bonding interactions which involve the hydride ligand as the proton accepting site. This investigation quantifies the thermodynamics of the hydrogen-bonding interaction and the basicity factor (E(j)) of the hydride complex. All techniques agree in indicating an equilibration process, after the immediate hydrogen-bond formation, between the hydride complex and an intermediate dihydrogen complex, [CpFe(dppe)(H(2))](+). The equilibrium is shifted toward the dihydrogen complex to a greater extent for the stronger alcohols and for higher alcohol/Fe ratios. The observed equilibration rate constant is linearly dependent on the alcohol concentration, in agreement with the involvement of two alcohol molecules and the formation of a homoconjugate pair. The rate constant increases with the acidity of the proton donor (TFE < HFIP < PFTB < TFA). The rate of the subsequent irreversible isomerization leading to the classical dihydride complex, [CpFe(dppe)H(2)](+), is first order, and the rate constant does not depend on the proton donor nature. The reaction continues, if conducted in CH(2)Cl(2), with a third, slower step leading to the paramagnetic [CpFe(dppe)Cl](+) product. The kinetic data are in accord with an isomerization mechanism consisting of an intramolecular reorganization, leading in one step from the dihydrogen complex to the classical dihydride species, and disagree with the occurrence of a proton-transfer process at the metal site.
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Affiliation(s)
- Natalia V Belkova
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov Street 28, 119991 Moscow, Russiaa
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Bergamo M, Beringhelli T, D'Alfonso G, Mercandelli P, Sironi A. NMR and DFT analysis of [Re(2)H(2)(CO)(9)]: evidence of an eta(2)-H(2) intermediate in a new type of fast mutual exchange between terminal and bridging hydrides. J Am Chem Soc 2002; 124:5117-26. [PMID: 11982377 DOI: 10.1021/ja0170652] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Protonation of the anion [Re(2)H(CO)(9)](-) (1) with a strong acid at 193 K affords the neutral complex [Re(2)H(2)(CO)(9)] (2), that in THF above 253 K irreversibly loses H(2) to give [Re(2)(CO)(9)(THF)], previously obtained by room-temperature protonation of 1. Treatment of 2 with NEt(4)OH restores the starting anion 1. Variable temperature (1)H and (13)C NMR spectra as well as T(1) measurements agree with the formulation of 2 as a classical [Re(2)H(mu-H)(CO)(9)] complex, in which two dynamic processes takes place. The "windshield-wiper motion" observed in several related complexes equalizes the two carbonyls trans to the hydrides (E(a) = 44(1) kJ mol(-)(1)), while another much faster process equalizes bridging and terminal hydrides already at 172 K. The variable temperature behavior of the (1)H transverse relaxation times revealed also proton exchange between 2, water, and the parent anion 1 (due to the acidity of 2), but such a process is too slow to account for the fast hydrides exchange in 2. The nature of the latter process has been investigated both experimentally and theoretically. Kinetic data, obtained by the analysis of the variable temperature (1)H spectra (E(a) = 24.5(5) kJ mol(-1)), revealed a small normal kinetic isotope effect (ca. 1.5). The (2)H chemical shift of the fully deuterated isotopomer 2-d(2) was found isochronous with 2, thus ruling out the presence of a significant concentration of a nonclassical [Re(2)(eta(2)-H(2))(CO)(9)] tautomer, in fast exchange with the classical dihydride. Density functional theory (DFT) calculations, carried out at the B3LYP level, confirmed the formulation of [Re(2)H(2)(CO)(9)] as a classical complex. However, when DFT was used to obtain a detailed description of the dynamic behavior of 2 in solution, a new type of hydride fast exchange emerged, involving the nonclassical tautomer as a relatively high energy (12.7 kJ mol(-1)) intermediate. Isotopic perturbation of the equilibrium by partial deuteration of 2 indicated the preference of deuterium for the bridging sites, with Delta H degrees = -475(4) J mol(-1) and Delta S degrees = -0.80(2) J K(-1) mol(-1). The same preference was observed in the anion [Re(2)H(mu-H)Cl(CO)(8)](-).
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Affiliation(s)
- Mirka Bergamo
- Dipartimento di Chimica Inorganica, Metallorganica e Analitica, Centro CNR CSMTBO, via Venezian 21, 20133 Milano, Italy
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