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Cypcar AD, Kerr TA, Yang JY. Thermochemical Studies of Nickel Hydride Complexes with Cationic Ligands in Aqueous and Organic Solvents. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrew D. Cypcar
- Department of Chemistry, University of California, Irvine, California 92697, United States
| | - Tyler A. Kerr
- Department of Chemistry, University of California, Irvine, California 92697, United States
| | - Jenny Y. Yang
- Department of Chemistry, University of California, Irvine, California 92697, United States
- Physical Sciences Division, Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
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2
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Mayberry DD, Linehan JC, Appel AM. Designing Catalytic Systems Using Binary Solvent Mixtures: Impact of Mole Fraction of Water on Hydride Transfer. Inorg Chem 2021; 60:17132-17140. [PMID: 34723498 DOI: 10.1021/acs.inorgchem.1c02397] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The free energy for hydride transfer reactions of transition metal hydrides is known to be influenced by solvent effects. The first-row transition metal hydride [HNi(dmpe)2][BF4] (dmpe = 1,2-bis(dimethylphosphino)ethane) has starkly different hydride transfer reactivities with CO2 in different solvents. A binary mixture of water and acetonitrile was used to tune the hydride transfer reactivity of HNi(dmpe)2+ with CO2 so that the free energy for this reaction approached zero. Various mole fractions of water were tested and a linear relationship between the hydride transfer free energy and solvent composition was established for 0-0.24 mole fraction of water. A deviation from linearity was found upon moving toward higher mole fractions of water. The tuning of the free energy for hydride transfer allowed HNi(dmpe)2+ to be used as a catalyst for the hydrogenation of CO2. The optimized catalyst conditions produced 58 turnovers at room temperature in 0.082 mole fraction of water using 60 atm of a 1:1 mixture of H2 to CO2 gas.
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Affiliation(s)
- Darrell D Mayberry
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - John C Linehan
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Aaron M Appel
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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3
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Masood Z, Ge Q. Electrochemical reduction of CO 2 to CO and HCOO - using metal-cyclam complex catalysts: predicting selectivity and limiting potential from DFT. Dalton Trans 2021; 50:11446-11457. [PMID: 34346446 DOI: 10.1039/d1dt02159a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Sustainable fuel production from CO2 through electrocatalytic reduction is promising but challenging due to high overpotential and poor product selectivity. Herein, we computed the reaction free energies of electrocatalytic reduction of CO2 to CO and HCOO- using the density functional theory method and screened transition metal(M)-cyclam(L) complexes as molecular catalysts for CO2 reduction. Our results showed that pKa of the proton adduct formed by the protonation of the reduced metal center can be used as a descriptor to select the operating pH of the solution to steer the reaction toward either the CO or hydride cycle. Among the complexes, [LNi]2+ and [LPd]2+ catalyze the reactions by following the CO cycle and are the CO selective catalysts in the pH ranges 1.81-7.31 and 6.10 and higher, respectively. Among the complexes that catalyze the reactions by following the hydride cycle, [LMo]2+ and [LW]3+ are HCOO- selective catalysts and have low limiting potentials of -1.33 V and -1.54 V, respectively. Other complexes, including [LRh]2+, [LIr]2+, [LW]2+, [LCo]2+, and [LTc]2+ catalyze the reactions resulting in either HCOO- from CO2 reduction or H2 from proton reduction; however, HCOO- formation is always thermodynamically more favorable. Notably, [LMo]2+, [LW]3+, [LW]2+ and [LCo]2+ have limiting potentials less negative than -1.6 V and are based on Earth-abundant elements, making them attractive for practical application.
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Affiliation(s)
- Zaheer Masood
- School of Chemical and Biomolecular Sciences, Southern Illinois University, Carbondale, IL 62901, USA.
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4
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Kumar A, Semwal S, Choudhury J. Emerging Implications of the Concept of Hydricity in Energy‐Relevant Catalytic Processes. Chemistry 2021; 27:5842-5857. [DOI: 10.1002/chem.202004499] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 11/20/2020] [Indexed: 11/09/2022]
Affiliation(s)
- Abhishek Kumar
- Organometallics & Smart Materials Laboratory Department of Chemistry Indian Institute of, Science Education and Research Bhopal Bhopal 462066 India
| | - Shrivats Semwal
- Organometallics & Smart Materials Laboratory Department of Chemistry Indian Institute of, Science Education and Research Bhopal Bhopal 462066 India
| | - Joyanta Choudhury
- Organometallics & Smart Materials Laboratory Department of Chemistry Indian Institute of, Science Education and Research Bhopal Bhopal 462066 India
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5
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Zurakowski JA, Bhattacharyya M, Spasyuk DM, Drover MW. Octaboraneyl [Ni(H)(diphosphine)2]+ Complexes: Exploiting Phosphine Ligand Lability for Hydride Transfer to an [NAD]+ Model. Inorg Chem 2020; 60:37-41. [DOI: 10.1021/acs.inorgchem.0c03409] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Joseph A. Zurakowski
- Department of Chemistry and Biochemistry, The University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada
| | - Moulika Bhattacharyya
- Department of Chemistry and Biochemistry, The University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada
| | - Denis M. Spasyuk
- Canadian Light Source Inc., 44 Innovation Boulevard, Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Marcus W. Drover
- Department of Chemistry and Biochemistry, The University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada
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6
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McNeill AS, Zhan CG, Appel AM, Stanbury DM, Dixon DA. The H•/H– Redox Couple and Absolute Hydration Energy of H–. J Phys Chem A 2020; 124:6084-6095. [DOI: 10.1021/acs.jpca.0c03833] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Ashley S. McNeill
- Department of Chemistry and Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Chang-Guo Zhan
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, Kentucky 40506, United States
| | - Aaron M. Appel
- Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - David M. Stanbury
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States
| | - David A. Dixon
- Department of Chemistry and Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
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7
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Brereton KR, Jadrich CN, Stratakes BM, Miller AJM. Thermodynamic Hydricity across Solvents: Subtle Electronic Effects and Striking Ligation Effects in Iridium Hydrides. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00278] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Kelsey R. Brereton
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Caleb N. Jadrich
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Bethany M. Stratakes
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Alexander J. M. Miller
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
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8
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Affiliation(s)
- Eric S. Wiedner
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999,
K2-57, Richland, Washington 99352, United States
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9
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Chang MC, Jesse KA, Filatov AS, Anderson JS. Reversible homolytic activation of water via metal-ligand cooperativity in a T-shaped Ni(ii) complex. Chem Sci 2019; 10:1360-1367. [PMID: 30809351 PMCID: PMC6354739 DOI: 10.1039/c8sc03719a] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 11/05/2018] [Indexed: 12/18/2022] Open
Abstract
A T-shaped Ni(ii) complex [Tol,PhDHPy]Ni has been prepared and characterized. EPR spectra and DFT calculations of this complex suggest that the electronic structure is best described as a high-spin Ni(ii) center antiferromagnetically coupled with a ligand-based radical. This complex reacts with water at room temperature to generate the dimeric complex [Tol,PhDHPy]Ni(μ-OH)Ni[Tol,PhDHPyH] which has been thoroughly characterized by SXRD, NMR, IR and deuterium-labeling experiments. Addition of simple ligands such as phosphines or pyridine displaces water and demonstrates the reversibility of water activation in this system. The water activation step has been examined by kinetic studies and DFT calculations which suggest an unusual homolytic reaction via a bimetallic mechanism. The ΔH ‡, ΔS ‡ and KIE (k H/k D) of the reaction are 5.5 kcal mol-1, -23.8 cal mol-1 K-1, and 2.4(1), respectively. In addition to the reversibility of water addition, this system is capable of activating water towards net O-atom transfer to substrates such as aromatic C-H bonds and phosphines. This reactivity is facilitated by the ability of the dihydrazonopyrrole ligand to accept H-atoms and illustrates the utility of metal ligand cooperation in activating O-H bonds with high bond dissociation energies.
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Affiliation(s)
- Mu-Chieh Chang
- Department of Chemistry , The University of Chicago , Chicago , Illinois 60637 , USA .
| | - Kate A Jesse
- Department of Chemistry , The University of Chicago , Chicago , Illinois 60637 , USA .
| | - Alexander S Filatov
- Department of Chemistry , The University of Chicago , Chicago , Illinois 60637 , USA .
| | - John S Anderson
- Department of Chemistry , The University of Chicago , Chicago , Illinois 60637 , USA .
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10
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Biswas S, Chowdhury A, Roy P, Pramanik A, Sarkar P. Computational studies on the hydride transfer barrier for the catalytic hydrogenation of CO2 by different Ni(II) complexes. J Mol Model 2018; 24:224. [PMID: 30088159 DOI: 10.1007/s00894-018-3758-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 07/20/2018] [Indexed: 11/24/2022]
Affiliation(s)
- Santu Biswas
- Department of Chemistry, Visva-Bharati University, Santiniketan, 731 235, India
| | - Animesh Chowdhury
- Department of Chemistry, Visva-Bharati University, Santiniketan, 731 235, India
| | - Prodyut Roy
- Department of Chemistry, Visva-Bharati University, Santiniketan, 731 235, India
| | - Anup Pramanik
- Department of Chemistry, Visva-Bharati University, Santiniketan, 731 235, India
| | - Pranab Sarkar
- Department of Chemistry, Visva-Bharati University, Santiniketan, 731 235, India.
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11
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Wiedner ES, Linehan JC. Making a Splash in Homogeneous CO
2
Hydrogenation: Elucidating the Impact of Solvent on Catalytic Mechanisms. Chemistry 2018; 24:16964-16971. [DOI: 10.1002/chem.201801759] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Indexed: 12/22/2022]
Affiliation(s)
- Eric S. Wiedner
- Catalysis Science Group Pacific Northwest National Laboratory P.O. Box 999 Richland WA 99352 USA
| | - John C. Linehan
- Catalysis Science Group Pacific Northwest National Laboratory P.O. Box 999 Richland WA 99352 USA
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12
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Ilic S, Pandey Kadel U, Basdogan Y, Keith JA, Glusac KD. Thermodynamic Hydricities of Biomimetic Organic Hydride Donors. J Am Chem Soc 2018; 140:4569-4579. [DOI: 10.1021/jacs.7b13526] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Stefan Ilic
- Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Usha Pandey Kadel
- Department of Chemistry, Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, United States
| | - Yasemin Basdogan
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - John A. Keith
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Ksenija D. Glusac
- Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
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13
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Waldie KM, Ostericher AL, Reineke MH, Sasayama AF, Kubiak CP. Hydricity of Transition-Metal Hydrides: Thermodynamic Considerations for CO2 Reduction. ACS Catal 2018. [DOI: 10.1021/acscatal.7b03396] [Citation(s) in RCA: 134] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Kate M. Waldie
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093-0358, United States
| | - Andrew L. Ostericher
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093-0358, United States
| | - Mark H. Reineke
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093-0358, United States
| | - Alissa F. Sasayama
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093-0358, United States
| | - Clifford P. Kubiak
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093-0358, United States
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14
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Neary MC, Quinlivan PJ, Parkin G. Zerovalent Nickel Compounds Supported by 1,2-Bis(diphenylphosphino)benzene: Synthesis, Structures, and Catalytic Properties. Inorg Chem 2017; 57:374-391. [DOI: 10.1021/acs.inorgchem.7b02636] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Michelle C. Neary
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Patrick J. Quinlivan
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Gerard Parkin
- Department of Chemistry, Columbia University, New York, New York 10027, United States
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15
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Burgess SA, Appel AM, Linehan JC, Wiedner ES. Changing the Mechanism for CO 2 Hydrogenation Using Solvent-Dependent Thermodynamics. Angew Chem Int Ed Engl 2017; 56:15002-15005. [PMID: 28961358 DOI: 10.1002/anie.201709319] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Indexed: 12/20/2022]
Abstract
A critical scientific challenge for utilization of CO2 is the development of catalyst systems that function in water and use inexpensive and environmentally friendly reagents. We have used thermodynamic insights to predict and demonstrate that the HCoI (dmpe)2 catalyst system, previously described for use in organic solvents, can hydrogenate CO2 to formate in water with bicarbonate as the only added reagent. Replacing tetrahydrofuran as the solvent with water changes the mechanism for catalysis by altering the thermodynamics for hydride transfer to CO2 from a key dihydride intermediate. The need for a strong organic base was eliminated by performing catalysis in water owing to the change in mechanism. These studies demonstrate that the solvent plays a pivotal role in determining the reaction thermodynamics and thereby catalytic mechanism and activity.
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Affiliation(s)
- Samantha A Burgess
- Catalysis Science Group, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA
| | - Aaron M Appel
- Catalysis Science Group, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA
| | - John C Linehan
- Catalysis Science Group, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA
| | - Eric S Wiedner
- Catalysis Science Group, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA
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16
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Changing the Mechanism for CO
2
Hydrogenation Using Solvent‐Dependent Thermodynamics. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201709319] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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17
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Burgess SA, Kendall AJ, Tyler DR, Linehan JC, Appel AM. Hydrogenation of CO2 in Water Using a Bis(diphosphine) Ni–H Complex. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00350] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Samantha A. Burgess
- Catalysis
Science Group, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Alexander J. Kendall
- Department
of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - David R. Tyler
- Department
of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - John C. Linehan
- Catalysis
Science Group, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Aaron M. Appel
- Catalysis
Science Group, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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18
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Ceballos BM, Tsay C, Yang JY. CO2 reduction or HCO2− oxidation? Solvent-dependent thermochemistry of a nickel hydride complex. Chem Commun (Camb) 2017. [DOI: 10.1039/c7cc02511d] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The hydricity (ΔGH−) of a newly synthesized nickel hydride was experimentally determined in acetonitrile (50.6 kcal mol−1), dimethyl sulfoxide (47.1 kcal mol−1), and water (22.8 kcal mol−1).
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Affiliation(s)
| | - Charlene Tsay
- Department of Chemistry
- University of California
- Irvine
- USA
| | - Jenny Y. Yang
- Department of Chemistry
- University of California
- Irvine
- USA
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19
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Brereton KR, Bellows SM, Fallah H, Lopez AA, Adams RM, Miller AJM, Jones WD, Cundari TR. Aqueous Hydricity from Calculations of Reduction Potential and Acidity in Water. J Phys Chem B 2016; 120:12911-12919. [PMID: 28002955 DOI: 10.1021/acs.jpcb.6b09864] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Hydricity, or hydride donating ability, is a thermodynamic value that helps define the reactivity of transition metal hydrides. To avoid some of the challenges of experimental hydricity measurements in water, a computational method for the determination of aqueous hydricity values has been developed. With a thermochemical cycle involving deprotonation of the metal hydride (pKa), 2e- oxidation of the metal (E°), and 2e- reduction of the proton, hydricity values are provided along with other valuable thermodynamic information. The impact of empirical corrections (for example, calibrating reduction potentials with 2e- organic versus 1e- inorganic potentials) was assessed in the calculation of the reduction potentials, acidities, and hydricities of a series of iridium hydride complexes. Calculated hydricities are consistent with electronic trends and agree well with experimental values.
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Affiliation(s)
- Kelsey R Brereton
- Department of Chemistry, University of North Carolina , Chapel Hill, North Carolina 27599, United States
| | - Sarina M Bellows
- Department of Chemistry, University of Rochester , Rochester, New York 14627, United States
| | - Hengameh Fallah
- Department of Chemistry and CASCaM, University of North Texas , Denton, Texas 76203, United States
| | - Antonio A Lopez
- Department of Chemistry and CASCaM, University of North Texas , Denton, Texas 76203, United States
| | - Robert M Adams
- Department of Chemistry and CASCaM, University of North Texas , Denton, Texas 76203, United States
| | - Alexander J M Miller
- Department of Chemistry, University of North Carolina , Chapel Hill, North Carolina 27599, United States
| | - William D Jones
- Department of Chemistry, University of Rochester , Rochester, New York 14627, United States
| | - Thomas R Cundari
- Department of Chemistry and CASCaM, University of North Texas , Denton, Texas 76203, United States
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20
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Brereton KR, Pitman CL, Cundari TR, Miller AJM. Solvent-Dependent Thermochemistry of an Iridium/Ruthenium H2 Evolution Catalyst. Inorg Chem 2016; 55:12042-12051. [DOI: 10.1021/acs.inorgchem.6b02223] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Kelsey R. Brereton
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Catherine L. Pitman
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Thomas R. Cundari
- Department
of Chemistry and CASCaM, University of North Texas, Denton, Texas 76203, United States
| | - Alexander J. M. Miller
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
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21
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Wiedner ES, Chambers MB, Pitman CL, Bullock RM, Miller AJM, Appel AM. Thermodynamic Hydricity of Transition Metal Hydrides. Chem Rev 2016; 116:8655-92. [PMID: 27483171 DOI: 10.1021/acs.chemrev.6b00168] [Citation(s) in RCA: 298] [Impact Index Per Article: 37.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Transition metal hydrides play a critical role in stoichiometric and catalytic transformations. Knowledge of free energies for cleaving metal hydride bonds enables the prediction of chemical reactivity, such as for the bond-forming and bond-breaking events that occur in a catalytic reaction. Thermodynamic hydricity is the free energy required to cleave an M-H bond to generate a hydride ion (H(-)). Three primary methods have been developed for hydricity determination: the hydride transfer method establishes hydride transfer equilibrium with a hydride donor/acceptor pair of known hydricity, the H2 heterolysis method involves measuring the equilibrium of heterolytic cleavage of H2 in the presence of a base, and the potential-pKa method considers stepwise transfer of a proton and two electrons to give a net hydride transfer. Using these methods, over 100 thermodynamic hydricity values for transition metal hydrides have been determined in acetonitrile or water. In acetonitrile, the hydricity of metal hydrides spans a range of more than 50 kcal/mol. Methods for using hydricity values to predict chemical reactivity are also discussed, including organic transformations, the reduction of CO2, and the production and oxidation of hydrogen.
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Affiliation(s)
- Eric S Wiedner
- Pacific Northwest National Laboratory , Richland, Washington 99352, United States
| | - Matthew B Chambers
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-3290, United States
| | - Catherine L Pitman
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-3290, United States
| | - R Morris Bullock
- Pacific Northwest National Laboratory , Richland, Washington 99352, United States
| | - Alexander J M Miller
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-3290, United States
| | - Aaron M Appel
- Pacific Northwest National Laboratory , Richland, Washington 99352, United States
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