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Kehoe R, Mahadevan M, Manzoor A, McMurray G, Wienefeld P, Baird MC, Budzelaar PHM. Reactions of the Ni(0) Compound Ni(PPh3)4 with Unactivated Alkyl Halides: Oxidative Addition Reactions Involving Radical Processes and Nickel(I) Intermediates. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00244] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Ryley Kehoe
- Department of Chemistry, Queen’s University, Kingston ON K7L 3N6, Canada
| | - Markshun Mahadevan
- Department of Chemistry, Queen’s University, Kingston ON K7L 3N6, Canada
| | - Adeela Manzoor
- Department of Chemistry, Queen’s University, Kingston ON K7L 3N6, Canada
| | - Gillian McMurray
- Department of Chemistry, Queen’s University, Kingston ON K7L 3N6, Canada
| | - Patrick Wienefeld
- Department of Chemistry, Queen’s University, Kingston ON K7L 3N6, Canada
| | - Michael C. Baird
- Department of Chemistry, Queen’s University, Kingston ON K7L 3N6, Canada
| | - Peter H. M. Budzelaar
- Department of Chemical Sciences, Federico II University of Naples, Napoli 80126, Italy
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Zhang S, Bullock RM. Molybdenum Hydride and Dihydride Complexes Bearing Diphosphine Ligands with a Pendant Amine: Formation of Complexes with Bound Amines. Inorg Chem 2015; 54:6397-409. [DOI: 10.1021/acs.inorgchem.5b00728] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shaoguang Zhang
- Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, K2-12, Richland, Washington 99352, United States
| | - R. Morris Bullock
- Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, K2-12, Richland, Washington 99352, United States
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van der Eide EF, Yang P, Bullock RM. Isolation of Two Agostic Isomers of an Organometallic Cation: Different Structures and Colors. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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4
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van der Eide EF, Yang P, Bullock RM. Isolation of Two Agostic Isomers of an Organometallic Cation: Different Structures and Colors. Angew Chem Int Ed Engl 2013; 52:10190-4. [PMID: 23897712 DOI: 10.1002/anie.201305032] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Indexed: 11/06/2022]
Affiliation(s)
- Edwin F van der Eide
- Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352 (USA)
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5
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Komuro T, Kanno Y, Tobita H. Synthesis, Structure, and Reactions of a (η3-α-silabenzyl)molybdenum Complex: A Synthetic Equivalent of a Coordinatively Unsaturated Silyl Complex. Organometallics 2013. [DOI: 10.1021/om400225j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Takashi Komuro
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Yuto Kanno
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Hiromi Tobita
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
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Alvarez MA, García ME, García-Vivó D, Menéndez S, Ruiz MA. Reversible P–C Coupling Reactions at the Unsaturated Dimolybdenum Carbyne Complex [Mo2(η5-C5H5)2(CPh)(μ-PCy2)(μ-SPh)(CO)]+. Organometallics 2012. [DOI: 10.1021/om300743q] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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
| | - Sonia Menéndez
- 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
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Antunes MA, Alves LG, Namorado S, Ascenso JR, Veiros LF, Martins AM. Hydride Abstraction from [MCpBz(CO)3H] (M = Mo, W; CpBz = C5(CH2Ph)5): New Cationic Complexes Stabilized by η5:η2-C5H4:C6H5 Bonding of the Pentabenzylcyclopentadienyl Ligand. Organometallics 2012. [DOI: 10.1021/om300070m] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- M. Augusta Antunes
- Centro de Química
Estrutural, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco
Pais 1, 1049-001 Lisboa, Portugal
| | - Luis G. Alves
- Centro de Química
Estrutural, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco
Pais 1, 1049-001 Lisboa, Portugal
| | - Sónia Namorado
- Centro de Química
Estrutural, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco
Pais 1, 1049-001 Lisboa, Portugal
| | - José R. Ascenso
- Centro de Química
Estrutural, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco
Pais 1, 1049-001 Lisboa, Portugal
| | - Luis F. Veiros
- Centro de Química
Estrutural, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco
Pais 1, 1049-001 Lisboa, Portugal
| | - Ana M. Martins
- Centro de Química
Estrutural, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco
Pais 1, 1049-001 Lisboa, Portugal
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9
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Batool M, Martin TA, Naser MA, George MW, Macgregor SA, Mahon MF, Whittlesey MK. Comparison of the photochemistry of organometallic N-heterocyclic carbene and phosphine complexes of manganese. Chem Commun (Camb) 2011; 47:11225-7. [DOI: 10.1039/c1cc14467g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Wang T, Brudvig GW, Batista VS. Study of Proton Coupled Electron Transfer in a Biomimetic Dimanganese Water Oxidation Catalyst with Terminal Water Ligands. J Chem Theory Comput 2010; 6:2395-2401. [PMID: 20827389 DOI: 10.1021/ct1002658] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The oxomanganese complex [H(2)O(terpy)Mn(III)(μ-O)(2)Mn(IV)(terpy)H(2)O](3+) (1, terpy = 2,2':6-2″-terpyridine) is a biomimetic model of the oxygen evolving complex of photosystem II with terminal water ligands. When bound to TiO(2) surfaces, 1 is activated by primary oxidants (e.g., Ce(4+)(aq), or oxone in acetate buffers) to catalyze the oxidation of water yielding O(2) evolution [G. Li et al. Energy Environ. Sci. 2, 230-238 (2009)]. The activation is thought to involve oxidation of the inorganic core [Mn(III)(μ-O)(2)Mn(IV)](3+) to generate the [Mn(IV)(μ-O)(2)Mn(IV)](4+) state 1(ox) first and then the highly reactive Mn oxyl species Mn(IV)O(•) through proton coupled electron transfer (PCET). Here, we investigate the step 1 → 1(ox) as compared to the analogous conversion in an oxomanganese complex without terminal water ligands, the [(bpy)(2) Mn (III) (μ-O)(2) Mn (IV) (bpy)(2)](3+) complex (2, bpy = 2,2'-bipyridyl). We characterize the oxidation in terms of free energy calculations of redox potentials and pKa's as directly compared to cyclic voltammogram measurements. We find that the pKa's of terminal water ligands depend strongly on the oxidation states of the Mn centers, changing by ~13 pH units (i.e., from 14 to 1) during the III, IV→IV, IV transition. Furthermore, we find that the oxidation potential of 1 is strongly dependent on pH (in contrast to the pH-independent redox potential of 2) as well as by coordination of Lewis base moieties (e.g., carboxylate groups) that competitively bind to Mn by exchange with terminal water ligands. The reported analysis of ligand binding free energies, pKa's and redox potentials indicates that the III, IV→IV, IV oxidation of 1 in the presence of acetate (AcO(-)) involves the following PCET: [H(2)O(terpy)Mn(III)(μ-O)(2)Mn(IV)(terpy)AcO](2+) → [HO(terpy)Mn(IV)(μ-O)(2)Mn(IV)(terpy)AcO](2+) + H(+) + e(-).
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Affiliation(s)
- Ting Wang
- Department of Chemistry, Yale University, PO Box 208107, New Haven, CT 06520-8107
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Wang T, Brudvig G, Batista VS. Characterization of proton coupled electron transfer in a biomimetic oxomanganese complex: Evaluation of the DFT B3LYP level of theory. J Chem Theory Comput 2010; 6:755-760. [PMID: 20607115 DOI: 10.1021/ct900615b] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The capabilities and limitations of the Becke-3-Lee-Yang-Parr (B3LYP) density functional theory (DFT) for modeling proton coupled electron transfer (PCET) in the mixed-valence oxomanganese complex 1 [(bpy)(2)Mn(III)(mu-O)(2)Mn(IV)(bpy)(2)](3+) (bpy = 2,2'-bipyridyl) are analyzed. Complex 1 serves as a prototypical synthetic model for studies of redox processes analogous to those responsible for water oxidation in the oxygen-evolving complex (OEC) of photosystem II (PSII). DFT B3LYP free energy calculations of redox potentials and pKa's are obtained according to the thermodynamic cycle formalism applied in conjunction with a continuum solvation model. We find that the pKa's of the oxo-ligands depend strongly on the oxidation states of the complex, changing by approximately 10 pH units (i.e., from pH~2 to pH~12) upon III,IV-->III,III reduction of complex 1. These computational results are consistent with the experimental pKa's determined by solution magnetic susceptibility and near-IR spectroscopy as well as with the pH dependence of the redox potential reported by cyclic voltammogram measurements, suggesting that the III,IV-->III,III reduction of complex 1 is coupled to protonation of the di-mu-oxo bridge as follows: [(bpy)(2)Mn(III)(mu-O)(2) Mn(IV)(bpy)(2)](3+)+H(+)+e(-)-->[(bpy)(2)Mn(III)(mu-O)(mu-OH)Mn(III)(bpy)(2)](3+). It is thus natural to expect that analogous redox processes might strongly modulate the pKa's of oxo and hydroxo/water ligands in the OEC of PSII, leading to deprotonation of the OEC upon oxidation state transitions.
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Affiliation(s)
- Ting Wang
- Department of Chemistry, Yale University, PO Box 208107, New Haven, CT 06520-8107
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