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Elucidation of Marcus Relationships for Hydride Transfer Reactions Involving Transition Metal Hydrides

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.5c08248· OSTI ID:2997742

The rate of hydride transfer from three Ir hydride complexes of the type Cp*Ir(Rbpy)H+ (Cp* = C5Me5; Rbpy = 4,4′-R-2,2′-bipyridine, R = OMe, H, CO2Me) to six N-methylacridinium (RAcr+) acceptors with electronically different substituents in the 2- or 2,7-positions were measured. Using the thermodynamic hydricity of the donors and the hydride affinity of the acceptors the thermodynamic driving forces for hydride transfer were determined. Brønsted plots, which correlate kinetic and thermodynamic hydricity, demonstrate distinct linear free energy relationships for each complex, with different Brønsted α values. Thus, at the same driving force hydride transfer from Cp*Ir(OMebpy)H+ is faster than for Cp*Ir(bpy)H+ or Cp*Ir(CO2Mebpy)H+. Experimental and computational analyses are consistent with a concerted hydride transfer mechanism for all Ir complexes. As the thermodynamic driving force increases an earlier transition state is observed and all transition states also include π-stacking interactions between the donor and acceptor, which likely contribute to the different α values. The experimental data fits well to the Marcus model, enabling the determination of reorganization energies (λ) that range from 58 to 69 kcal mol-1. These are lower than λ values for hydride transfer reactions involving organic donors and acceptors. This work provides a rare example of the correlation of kinetic and thermodynamic hydricity using only experimental data and shows that hydride transfer reactions involving metal hydrides can follow Marcus theory. Furthermore, the findings offer insight into controlling metal-catalyzed hydride transfer reactions, which is valuable for designing improved systems for a range of transformations.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
SC0012704; SC0014255
OSTI ID:
2997742
Report Number(s):
BNL--229021-2025-JAAM
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 36 Vol. 147; ISSN 0002-7863; ISSN 1520-5126
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (119)

Selective Hydrogenation for Fine Chemicals: Recent Trends and New Developments journal January 2003
Quantitatively Correlating the Effect of Ligand-Substituent Size in Asymmetric Catalysis Using Linear Free Energy Relationships journal January 2008
Transformation of Carbon Dioxide with Homogeneous Transition-Metal Catalysts: A Molecular Solution to a Global Challenge? journal August 2011
Catalytic Disproportionation of Formic Acid to Generate Methanol journal February 2013
Selective Catalytic Synthesis Using the Combination of Carbon Dioxide and Hydrogen: Catalytic Chess at the Interface of Energy and Chemistry journal May 2016
Hydroformylation. Fundamentals, Processes, and Applications in Organic Synthesis. By Armin Börner and Robert Franke. journal September 2016
Recent Advances in Catalytic Hydrosilylations: Developments beyond Traditional Platinum Catalysts journal December 2020
Double Bond Isomerisation and Migration-New Playgrounds for Transition Metal-Catalysis journal July 2014
Reusable Catalysts for Hydroformylation‐Based Reactions journal May 2021
Tandem Arylation/Friedel–Crafts Reactions of o‐Acylanilines with Diaryliodonium Salts: A Modular Synthesis of Acridine Derivatives journal April 2015
Reactivities of acridine compounds in hydride transfer reactions journal May 2007
Linear free energy relationships in heterogeneous catalysis I. Dealkylation of alkylbenzenes on cracking catalysts journal April 1967
Reorganization energies in benzene, naphthalene, and anthracene journal November 1994
Early transition metal hydride complexes: synthesis and reactivity journal November 2002
Transition metal hydrides as active intermediates in hydrogen transfer reactions journal June 2002
Recent advances in the 18-electron complex transition metal hydrides of Ni, Fe, Co and Ru journal July 2017
Recent advances in homogeneous base-metal-catalyzed transfer hydrogenation reactions journal October 2021
Biomimetic Metal-Free Hydride Donor Catalysts for CO2 Reduction journal February 2022
Reversible Hydrogenation of Carbon Dioxide to Formic Acid and Methanol: Lewis Acid Enhancement of Base Metal Catalysts journal February 2017
Isomerization of Allylbenzenes journal May 2015
CO 2 Hydrogenation to Formate and Methanol as an Alternative to Photo- and Electrochemical CO 2 Reduction journal August 2015
The Golden Age of Transfer Hydrogenation journal June 2015
Thermodynamic Hydricity of Transition Metal Hydrides journal June 2016
Introduction: Metal Hydrides journal June 2016
Homogeneous Catalysis for Sustainable Hydrogen Storage in Formic Acid and Alcohols journal October 2017
Hydride Transfer Reactions Catalyzed by Cobalt Complexes journal October 2018
Prediction of Kinetic Isotope Effects for Various Hydride Transfer Reactions Using a New Kinetic Model journal March 2016
New Way for Probing Bond Strength journal February 2020
Kinetics of Hydride Transfer from Catalytic Metal-Free Hydride Donors to CO 2 journal March 2021
Urea and Thiourea H-Bond Donating Catalysts for Ring-Opening Polymerization: Mechanistic Insights via (Non)linear Free Energy Relationships journal April 2018
Carbon Dioxide Insertion into Rhenium Hydrides as a Probe for the Impact of Solvent on Linear Free Energy Relationships between Thermodynamic and Kinetic Hydricity journal October 2023
Catalytic Homogeneous Asymmetric Hydrogenation: Successes and Opportunities journal December 2018
Thermodynamic Hydricity across Solvents: Subtle Electronic Effects and Striking Ligation Effects in Iridium Hydrides journal July 2019
Alkene Isomerization through Allylmetals as a Strategic Tool in Stereoselective Synthesis journal April 2020
Distinct Mechanisms and Hydricities of Cp*Ir-Based CO 2 Hydrogenation Catalysts in Basic Water journal April 2021
Advances in Base-Metal-Catalyzed Alkene Hydrosilylation journal January 2017
Hydricity of Transition-Metal Hydrides: Thermodynamic Considerations for CO 2 Reduction journal January 2018
Supramolecular Approaches To Control Activity and Selectivity in Hydroformylation Catalysis journal March 2018
Transient Species in the Stepwise Interconversion of NADH and NAD+ journal March 2004
Understanding Hydrogen Atom Transfer: From Bond Strengths to Marcus Theory journal January 2011
Transition-Metal-Catalyzed Carbonylation Reactions of Olefins and Alkynes: A Personal Account journal February 2014
Industrial-Scale Synthesis and Applications of Asymmetric Hydrogenation Catalysts journal December 2007
Catalysis and Linear Free Energy Relationships in Aspartic Proteases journal June 2006
The search for larger and more weakly coordinating anions journal May 1993
Applied Hydroformylation journal August 2012
Dehydrogenation as a Substrate-Activating Strategy in Homogeneous Transition-Metal Catalysis journal February 2010
Electrochemical Solvent Reorganization Energies in the Framework of the Polarizable Continuum Model journal April 2014
Marcus theory in organic chemistry. Mechanisms of electron and proton transfers from aromatics and their cation radicals journal July 1986
Application of the Marcus equation to methyl transfers journal July 1986
Phenomenological manifestations of large-curvature tunneling in hydride-transfer reactions journal July 1986
An experimentally based family of potential energy surfaces for hydride transfer between NAD+ analogs journal October 1991
The Marcus theory of the reactions of quinolinium ions with borohydride and hydroxide journal February 1990
Electron-transfer reactions of radical anions: do they follow outer- or inner-sphere mechanisms? journal May 1990
Structure sensitivity of the Marcus .lambda. for hydride transfer between NAD+ analogs journal January 1988
Estimation of inner shell Marcus terms for amino nitrogen compounds by molecular orbital calculations journal February 1987
Long-range photoinduced through-bond electron transfer and radiative recombination via rigid nonconjugated bridges: distance and solvent dependence journal May 1987
Application of Marcus theory to metal ion catalyzed group transfer reactions journal January 1984
Marcus theory of a perpendicular effect on .alpha. for hydride transfer between NAD+ analogs journal May 1984
Kinetics and mechanism of aromatic oxidative substitutions via electron transfer. Application of Marcus theory to organic processes in the endergonic region journal June 1984
Isotope effects on hydride transfer between NAD+ analogs journal December 1983
Theoretical studies of SN2 transition states. 2. Intrinsic barriers, rate-equilibrium relationships, and the Marcus equation journal December 1981
Rate-Equilibrium Relationships in Hydride Transfer Reactions:  The Role of Intrinsic Barriers journal April 2002
Hydricities of BzNADH, C 5 H 5 Mo(PMe 3 )(CO) 2 H, and C 5 Me 5 Mo(PMe 3 )(CO) 2 H in Acetonitrile journal March 2004
Nonperfect Synchronization of Reaction Center Rehybridization in the Transition State of the Hydride Transfer Catalyzed by Dihydrofolate Reductase journal September 2005
Theoretical Analysis of Proton Relays in Electrochemical Proton-Coupled Electron Transfer journal June 2011
Thermodynamic and Kinetic Hydricity of Ruthenium(II) Hydride Complexes journal September 2012
Photoswitchable Hydride Transfer from Iridium to 1-Methylnicotinamide Rationalized by Thermochemical Cycles journal October 2014
Hydrogen Atom Transfer Reactions of a Ruthenium Imidazole Complex: Hydrogen Tunneling and the Applicability of the Marcus Cross Relation journal November 2008
Marcus Theory of a Parallel Effect on α for Hydride Transfer Reaction between NAD + Analogues journal March 1997
Hydride Transfer Reactions of Transition Metal Hydrides:  Kinetic Hydricity of Metal Carbonyl Hydrides journal December 1998
Thermodynamic and Kinetic Studies of Hydride Transfer for a Series of Molybdenum and Tungsten Hydrides journal March 1999
Steric Control of Electron Transfer. Changeover from Outer-Sphere to Inner-Sphere Mechanisms in Arene/Quinone Redox Pairs journal January 1999
Isotope Effects on Hydride Transfer Reactions from Transition Metal Hydrides to Trityl Cation. An Inverse Isotope Effect for a Hydride Transfer journal April 1999
Intrinsic Barriers for Electron and Hydrogen Atom Transfer Reactions of Biomimetic Iron Complexes journal June 2000
Bimodal Evans–Polanyi Relationships in Hydrogen Atom Transfer from C(sp3)–H Bonds to the Cumyloxyl Radical. A Combined Time-Resolved Kinetic and Computational Study journal July 2021
Correlating Thermodynamic and Kinetic Hydricities of Rhenium Hydrides journal September 2022
Thermodynamic and Kinetic Activity Descriptors for the Catalytic Hydrogenation of Ketones journal March 2024
Aqueous Hydricity of Late Metal Catalysts as a Continuum Tuned by Ligands and the Medium journal February 2016
Theoretical Study of C–H Bond Cleavage via Concerted Proton-Coupled Electron Transfer in Fluorenyl-Benzoates journal November 2018
Rate–Driving Force Relationships in the Multisite Proton-Coupled Electron Transfer Activation of Ketones journal January 2019
Transition State Asymmetry in C–H Bond Cleavage by Proton-Coupled Electron Transfer journal June 2019
Understanding the Individual and Combined Effects of Solvent and Lewis Acid on CO 2 Insertion into a Metal Hydride journal May 2019
Strategies for Enhancing the Rate Constant of C–H Bond Cleavage by Concerted Proton-Coupled Electron Transfer journal August 2019
Reactivities of Five-Membered Heterocycles in Hydride Transfer Reactions journal September 1998
Reinterpretation of the Brønsted α for Redox Reactions Based on the Effect of Substituents on Hydride Transfer Reaction Rates between NAD+ Analogues journal February 2006
Transition State Barriers in Multidimensional Marcus Theory journal October 2008
Primary Kinetic Isotope Effects on Hydride Transfer from Heterocyclic Compounds to NAD+ Analogues journal September 2009
Quantum Calculation of Molecular Energies and Energy Gradients in Solution by a Conductor Solvent Model journal March 1998
Simple Marcus-Theory-Type Model for Hydrogen-Atom Transfer/Proton-Coupled Electron Transfer journal May 2011
Remote functionalization through alkene isomerization journal February 2016
Earth-abundant transition metal catalysts for alkene hydrosilylation and hydroboration journal April 2018
Homogeneous hydrogenation of carbon dioxide to methanol journal January 2014
Well-defined transition metal hydrides in catalytic isomerizations journal January 2014
Recycling of carbon dioxide to methanol and derived products – closing the loop journal January 2014
Hydrosilylation reaction of olefins: recent advances and perspectives journal January 2015
Electronic effects on the catalytic disproportionation of formic acid to methanol by [Cp*Ir III (R-bpy)Cl]Cl complexes journal January 2016
Thermodynamic and kinetic hydricities of metal-free hydrides journal January 2018
Acceleration of CO 2 insertion into metal hydrides: ligand, Lewis acid, and solvent effects on reaction kinetics journal January 2018
Thermodynamic and kinetic hydricity of transition metal hydrides journal January 2020
Transition metal-catalyzed alkene isomerization as an enabling technology in tandem, sequential and domino processes journal January 2021
Mechanistic basis for tuning iridium hydride photochemistry from H 2 evolution to hydride transfer hydrodechlorination journal January 2020
A framework for constructing linear free energy relationships to design molecular transition metal catalysts journal January 2021
Recent developments in asymmetric hydroformylation journal January 2021
C–H oxidation in fluorenyl benzoates does not proceed through a stepwise pathway: revisiting asynchronous proton-coupled electron transfer journal September 2021
Synthesis of acridinesviacopper-catalyzed amination/annulation cascades between arylboronic acids and anthranils journal January 2022
The multifarious world of transition metal hydrides journal January 2003
Mechanistic aspects of transition metal-catalyzed hydrogen transfer reactions journal January 2006
The coordination chemistry of organo-hydride donors: new prospects for efficient multi-electron reduction journal January 2013
Solvent reorganization energy of electron-transfer reactions in polar solvents journal April 2004
Theory of Electron‐Transfer Reaction Rates of Solvated Electrons journal November 1965
On the Theory of Oxidation‐Reduction Reactions Involving Electron Transfer. I journal May 1956
r 2 SCAN-3c: A “Swiss army knife” composite electronic-structure method journal February 2021
Nuclear–electronic orbital methods: Foundations and prospects journal July 2021
Predicting organic hydrogen atom transfer rate constants using the Marcus cross relation journal March 2010
Beyond the classical thermodynamic contributions to hydrogen atom abstraction reactivity journal September 2018
A new strategy to efficiently cleave and form C–H bonds using proton-coupled electron transfer journal July 2018
π-π stacking interactions: Non-negligible forces for stabilizing porous supramolecular frameworks journal January 2020
Application of the Marcus Cross Relation to Hydrogen Atom Transfer Reactions journal December 2001
Chemical and Electrochemical Electron-Transfer Theory journal October 1964

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