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Islam F, Ahsan M, Islam N, Hossain MI, Bahadur NM, Aziz A, Al-Humaidi JY, Rahman MM, Maiyalagan T, Hasnat MA. Recent Advancements in Ascribing Several Platinum Free Electrocatalysts Pertinent to Hydrogen Evolution from Water Reduction. Chem Asian J 2024; 19:e202400220. [PMID: 38654594 DOI: 10.1002/asia.202400220] [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: 02/29/2024] [Revised: 04/16/2024] [Accepted: 04/21/2024] [Indexed: 04/26/2024]
Abstract
The advancement of a sustainable and scalable catalyst for hydrogen production is crucial for the future of the hydrogen economy. Electrochemical water splitting stands out as a promising pathway for sustainable hydrogen production. However, the development of Pt-free electrocatalysts that match the energy efficiency of Pt while remaining economical poses a significant challenge. This review addresses this challenge by highlighting latest breakthroughs in Pt-free catalysts for the hydrogen evolution reaction (HER). Specifically, we delve into the catalytic performance of various transition metal phosphides, metal carbides, metal sulphides, and metal nitrides toward HER. Our discussion emphasizes strategies for enhancing catalytic performance and explores the relationship between structural composition and the performance of different electrocatalysts. Through this comprehensive review, we aim to provide insights into the ongoing efforts to overcome barriers to scalable hydrogen production and pave the way for a sustainable hydrogen economy.
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Affiliation(s)
- Fahamidul Islam
- Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, 3114, Bangladesh
- Department of Chemistry, Faculty of Science, Noakhali Science and Technology University, Noakhali, 3814, Bangladesh
| | - Mohebul Ahsan
- Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, 3114, Bangladesh
- Division of Chemistry, Department of Science and Humanities, Military Institute of Science and Technology, Mirpur Cantonment-, 1216, Dhaka, Bangladesh
| | - Nurnobi Islam
- Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, 3114, Bangladesh
| | - Mohammad Imran Hossain
- Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, 3114, Bangladesh
| | - Newaz Mohammed Bahadur
- Department of Chemistry, Faculty of Science, Noakhali Science and Technology University, Noakhali, 3814, Bangladesh
| | - Abdul Aziz
- Interdisciplinary Research Center for Hydrogen Technologies and Carbon Management (IRC-HTCM), King Fahd University of Petroleum & Minerals, KFUPM Box 5040, Dhahran, 31261, Saudi Arabia
| | - Jehan Y Al-Humaidi
- Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P.O. BOX 84428, Riyadh, 11671, Saudi Arabia
| | - Mohammed M Rahman
- Center of Excellence for Advanced Materials Research (CEAMR) & Chemistry department, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - T Maiyalagan
- Department of Chemistry, SRM Institute of Science and Technology, Kattankulathur, 603 203, Tamilnadu, India
| | - Mohammad A Hasnat
- Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, 3114, Bangladesh
- International Research Organization for Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, 860-8555, Japan
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2
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Lagnika L, Avosse SI, Bouraima FO, Sindedji CB, Dakle M, Gueret R, Fort L, Gimbert Y, Napporn TW, Zigah D, Aubouy A, Maisonhaute E. Voltammetric techniques for low-cost on-site routine analysis of thymol in the medicinal plant Ocimum gratissimum. Talanta 2024; 269:125411. [PMID: 38008023 DOI: 10.1016/j.talanta.2023.125411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Accepted: 11/13/2023] [Indexed: 11/28/2023]
Abstract
The composition of essential oils varies according to culture conditions and climate, which induces a need for simple and inexpensive characterization methods close to the place of extraction. This appears particularly important for developing countries. Herein, we develop an analytical strategy to determine the thymol content in Ocimum Gratissimum, a medicinal plant from Benin. The protocol is based on electrochemical techniques (cyclic and square wave voltammetry) implemented with a low cost potentiostat. Thymol is a phenol derivative and was directly oxidized at the electrode surface. We had to resort to submillimolar concentrations (25-300 μM) in order to minimize production of phenol oligomers that passivate the electrode. We worked first on two essential oils and realized that in one of them the thymol concentration was below our detection method. These results were confirmed by gas chromatography - mass spectrometry. Furthermore, we optimized the detection protocol to analyze an infusion made directly from the leaves of the plant. Finally, we studied whether the cost of the electrochemical cell may also be minimized by using pencil lead as working and counter electrodes.
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Affiliation(s)
- Latifou Lagnika
- Laboratoire de Biochimie et Substances Naturelles Bioactives, Faculté des Sciences et Techniques, Université d'Abomey-Calavi, Abomey-Calavi, Benin.
| | - Solange Imelda Avosse
- Laboratoire de Biochimie et Substances Naturelles Bioactives, Faculté des Sciences et Techniques, Université d'Abomey-Calavi, Abomey-Calavi, Benin
| | - Faridath Oyélékan Bouraima
- Laboratoire de Biochimie et Substances Naturelles Bioactives, Faculté des Sciences et Techniques, Université d'Abomey-Calavi, Abomey-Calavi, Benin
| | - Candide Bidossessi Sindedji
- Laboratoire de Biochimie et Substances Naturelles Bioactives, Faculté des Sciences et Techniques, Université d'Abomey-Calavi, Abomey-Calavi, Benin
| | - Mathieu Dakle
- Laboratoire de Biochimie et Substances Naturelles Bioactives, Faculté des Sciences et Techniques, Université d'Abomey-Calavi, Abomey-Calavi, Benin
| | - Rodolphe Gueret
- Département de Chimie Moléculaire - DCM UMR 5250, CNRS/Université Grenoble Alpes, UGA, 38000 Grenoble, France
| | - Laure Fort
- Département de Chimie Moléculaire - DCM UMR 5250, CNRS/Université Grenoble Alpes, UGA, 38000 Grenoble, France
| | - Yves Gimbert
- Département de Chimie Moléculaire - DCM UMR 5250, CNRS/Université Grenoble Alpes, UGA, 38000 Grenoble, France; Institut Parisien de Chimie Moléculaire, CNRS UMR 8232, Sorbonne Université, 4 Place Jussieu, F-75252, Paris, Cedex5, France
| | - Teko W Napporn
- Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), Université de Poitiers, CNRS, F-86073, Poitiers, France
| | - Dodzi Zigah
- Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), Université de Poitiers, CNRS, F-86073, Poitiers, France
| | - Agnès Aubouy
- UMR152 PHARMADEV, Toulouse University, IRD, UPS, France; Institut de Recherche Clinique du Bénin (IRCB), Abomey Calavi, Benin.
| | - Emmanuel Maisonhaute
- Sorbonne Université, CNRS, Laboratoire Interfaces et Systèmes Electrochimiques, 4 Place Jussieu, F-75252, Paris, Cedex5, France.
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3
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Cho J, Kim B, Venkateshalu S, Chung DY, Lee K, Choi SI. Electrochemically Activatable Liquid Organic Hydrogen Carriers and Their Applications. J Am Chem Soc 2023; 145:16951-16965. [PMID: 37439128 DOI: 10.1021/jacs.2c13324] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/14/2023]
Abstract
Hydrogen has been chosen as an environmentally benign energy source to replace fossil-fuel-based energy systems. Since hydrogen is difficult to store and transport in its gaseous phase, thermochemical liquid organic hydrogen carriers (LOHCs) have been developed as one of the alternative technologies. However, the high temperature and pressure requirements of thermochemical LOHC systems result in huge energy waste and impracticality. This Perspective proposes electrochemical (EC)-LOHCs capable of more efficient, safer, and lower temperature and pressure hydrogen storage/utilization. To enable this technology, several EC-LOHC candidates such as isopropanol, phenolic compounds, and organic acids are described, and the latest research trends and design concepts of related homo/hetero-based electrocatalysts are discussed. In addition, we propose efficient fuel-cell-based systems that implement electrochemical (de)hydrogenation of EC-LOHCs and present prospects for relevant technologies.
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Affiliation(s)
- Juhyun Cho
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Byeongyoon Kim
- Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul 02841, Republic of Korea
| | - Sandhya Venkateshalu
- Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul 02841, Republic of Korea
| | - Dong Young Chung
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Kwangyeol Lee
- Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul 02841, Republic of Korea
| | - Sang-Il Choi
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea
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4
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Sun F, Tang Q, Jiang DE. Theoretical Advances in Understanding and Designing the Active Sites for Hydrogen Evolution Reaction. ACS Catal 2022. [DOI: 10.1021/acscatal.2c02081] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Fang Sun
- School of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing 401331, China
| | - Qing Tang
- School of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing 401331, China
| | - De-en Jiang
- Department of Chemistry, University of California, Riverside, California 92521, United States
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5
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Agarwal RG, Coste SC, Groff BD, Heuer AM, Noh H, Parada GA, Wise CF, Nichols EM, Warren JJ, Mayer JM. Free Energies of Proton-Coupled Electron Transfer Reagents and Their Applications. Chem Rev 2021; 122:1-49. [PMID: 34928136 DOI: 10.1021/acs.chemrev.1c00521] [Citation(s) in RCA: 134] [Impact Index Per Article: 44.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We present an update and revision to our 2010 review on the topic of proton-coupled electron transfer (PCET) reagent thermochemistry. Over the past decade, the data and thermochemical formalisms presented in that review have been of value to multiple fields. Concurrently, there have been advances in the thermochemical cycles and experimental methods used to measure these values. This Review (i) summarizes those advancements, (ii) corrects systematic errors in our prior review that shifted many of the absolute values in the tabulated data, (iii) provides updated tables of thermochemical values, and (iv) discusses new conclusions and opportunities from the assembled data and associated techniques. We advocate for updated thermochemical cycles that provide greater clarity and reduce experimental barriers to the calculation and measurement of Gibbs free energies for the conversion of X to XHn in PCET reactions. In particular, we demonstrate the utility and generality of reporting potentials of hydrogenation, E°(V vs H2), in almost any solvent and how these values are connected to more widely reported bond dissociation free energies (BDFEs). The tabulated data demonstrate that E°(V vs H2) and BDFEs are generally insensitive to the nature of the solvent and, in some cases, even to the phase (gas versus solution). This Review also presents introductions to several emerging fields in PCET thermochemistry to give readers windows into the diversity of research being performed. Some of the next frontiers in this rapidly growing field are coordination-induced bond weakening, PCET in novel solvent environments, and reactions at material interfaces.
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Affiliation(s)
- Rishi G Agarwal
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Scott C Coste
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Benjamin D Groff
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Abigail M Heuer
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Hyunho Noh
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Giovanny A Parada
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States.,Department of Chemistry, The College of New Jersey, Ewing, New Jersey 08628, United States
| | - Catherine F Wise
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Eva M Nichols
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Jeffrey J Warren
- Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
| | - James M Mayer
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
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6
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Huang D, Kim DJ, Rigby K, Zhou X, Wu X, Meese A, Niu J, Stavitski E, Kim JH. Elucidating the Role of Single-Atom Pd for Electrocatalytic Hydrodechlorination. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:13306-13316. [PMID: 34545738 DOI: 10.1021/acs.est.1c04294] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In this study, we loaded Pd catalysts onto a reduced graphene oxide (rGO) support in an atomically dispersed fashion [i.e., Pd single-atom catalysts (SACs) on rGO or Pd1/rGO] via a facile and scalable synthesis based on anchor-site and photoreduction techniques. The as-synthesized Pd1/rGO significantly outperformed the Pd nanoparticle (Pdnano) counterparts in the electrocatalytic hydrodechlorination of chlorinated phenols. Downsizing Pdnano to Pd1 leads to a substantially higher Pd atomic efficiency (14 times that of Pdnano), remarkably reducing the cost for practical applications. The unique single-atom architecture of Pd1 additionally affects the desorption energy of the intermediate, suppressing the catalyst poisoning by Cl-, which is a prevalent challenge with Pdnano. Characterization and experimental results demonstrate that the superior performance of Pd1/rGO originates from (1) enhanced interfacial electron transfer through Pd-O bonds due to the electronic metal-support interaction and (2) increased atomic H (H*) utilization efficiency by inhibiting H2 evolution on Pd1. This work presents an important example of how the unique geometric and electronic structure of SACs can tune their catalytic performance toward beneficial use in environmental remediation applications.
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Affiliation(s)
- Dahong Huang
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, Guangdong 523808, P. R. China
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
| | - David J Kim
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
| | - Kali Rigby
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
| | - Xuechen Zhou
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
| | - Xuanhao Wu
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
| | - Aidan Meese
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
| | - Junfeng Niu
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, Guangdong 523808, P. R. China
| | - Eli Stavitski
- National Synchrotron Light Source-II, Brookhaven National Laboratory, Upton, New York, New York 11973, United States
| | - Jae-Hong Kim
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
- NSF Nanosystems Engineering Research Center for Nanotechnology Enabled Water Treatment (NEWT), Yale University, 17 Hillhouse Ave, New Haven, Connecticut, 06511, United States
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7
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Nafion-stabilized black phosphorus nanosheets-maltosyl-β-cyclodextrin as a chiral sensor for tryptophan enantiomers. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 112:110910. [DOI: 10.1016/j.msec.2020.110910] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 03/29/2020] [Accepted: 03/31/2020] [Indexed: 01/07/2023]
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8
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Dey A, Maity A, Singha Mahapatra T, Suresh E, Mandal AK, Das A. A tuneable hierarchical self-assembly of a C3-symmetric triaminoguanidinium-derivative into a rhombic dodecahedral morphology. CrystEngComm 2020. [DOI: 10.1039/d0ce00909a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A controllable self-assembly of a small organic molecule produces a crystalline ordered rhombic dodecahedral shape with a size up to 23.7 μm. Crystal structure analysis expounds the growth mechanism for this particular shape evaluation.
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Affiliation(s)
- Ananta Dey
- Analytical and Environmental Science Division and Centralized Instrument Facility
- CSIR-Central Salt and Marine Chemicals Research Institute
- Bhavnagar
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Arunava Maity
- Analytical and Environmental Science Division and Centralized Instrument Facility
- CSIR-Central Salt and Marine Chemicals Research Institute
- Bhavnagar
- India
| | - Tufan Singha Mahapatra
- Analytical and Environmental Science Division and Centralized Instrument Facility
- CSIR-Central Salt and Marine Chemicals Research Institute
- Bhavnagar
- India
- ICFAI Science School (Chemistry)
| | - Eingathodi Suresh
- Analytical and Environmental Science Division and Centralized Instrument Facility
- CSIR-Central Salt and Marine Chemicals Research Institute
- Bhavnagar
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Amal Kumar Mandal
- Analytical and Environmental Science Division and Centralized Instrument Facility
- CSIR-Central Salt and Marine Chemicals Research Institute
- Bhavnagar
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Amitava Das
- Analytical and Environmental Science Division and Centralized Instrument Facility
- CSIR-Central Salt and Marine Chemicals Research Institute
- Bhavnagar
- India
- Academy of Scientific and Innovative Research (AcSIR)
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9
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Zou J, Yu JG. Chiral recognition of tyrosine enantiomers on a novel bis-aminosaccharides composite modified glassy carbon electrode. Anal Chim Acta 2019; 1088:35-44. [DOI: 10.1016/j.aca.2019.08.018] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Revised: 08/01/2019] [Accepted: 08/12/2019] [Indexed: 01/20/2023]
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10
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Martin-Benlloch X, Novodomska A, Jacquemin D, Davioud-Charvet E, Elhabiri M. Iron( iii) coordination properties of ladanein, a flavone lead with a broad-spectrum antiviral activity. NEW J CHEM 2018. [DOI: 10.1039/c7nj04867j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The Fe(iii) complexation properties of ladanein, a potent antiviral flavone, and related analogues (negletein and salvigenin), have been studied in solution under quasi-physiological conditions using physico-chemical tools and provided important insights into their stability/reactivity in solution.
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Affiliation(s)
| | - A. Novodomska
- Université de Strasbourg
- Université de Haute-Alsace
- CNRS
- LIMA
- UMR 7042
| | - D. Jacquemin
- Ceisam Laboratory
- UMR CNRS 6230
- University of Nantes
- 44322 Nantes Cedex3
- France
| | | | - M. Elhabiri
- Université de Strasbourg
- Université de Haute-Alsace
- CNRS
- LIMA
- UMR 7042
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11
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Dey A, Dana J, Aute S, Maity P, Das A, Ghosh HN. Proton-Coupled Electron-Transfer Processes in Ultrafast Time Domain: Evidence for Effects of Hydrogen-Bond Stabilization on Photoinduced Electron Transfer. Chemistry 2017; 23:3455-3465. [DOI: 10.1002/chem.201605594] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Ananta Dey
- Organic Chemistry Division CSIR; National Chemical Laboratory; Pune, Maharashtra 411008 India
| | - Jayanta Dana
- Radiation and Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400085 India
| | - Sunil Aute
- Organic Chemistry Division CSIR; National Chemical Laboratory; Pune, Maharashtra 411008 India
| | - Partha Maity
- Radiation and Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400085 India
| | - Amitava Das
- Organic Chemistry Division CSIR; National Chemical Laboratory; Pune, Maharashtra 411008 India
- CSIR-Central Salt and Marine Chemicals Research Institute; Bhavnagar 364002 Gujarat India
| | - Hirendra N. Ghosh
- Radiation and Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400085 India
- Institute of Nano Science and Technology; Mohali Punjab 160062 India
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12
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Li H, Zhang MT. Tuning Excited-State Reactivity by Proton-Coupled Electron Transfer. Angew Chem Int Ed Engl 2016; 55:13132-13136. [DOI: 10.1002/anie.201607176] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Han Li
- Center of Basic Molecular Science (CBMS); Department of Chemistry; Tsinghua University; Beijing 100084 China
| | - Ming-Tian Zhang
- Center of Basic Molecular Science (CBMS); Department of Chemistry; Tsinghua University; Beijing 100084 China
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13
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Li H, Zhang MT. Tuning Excited-State Reactivity by Proton-Coupled Electron Transfer. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201607176] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Han Li
- Center of Basic Molecular Science (CBMS); Department of Chemistry; Tsinghua University; Beijing 100084 China
| | - Ming-Tian Zhang
- Center of Basic Molecular Science (CBMS); Department of Chemistry; Tsinghua University; Beijing 100084 China
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14
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Elgrishi N, McCarthy BD, Rountree ES, Dempsey JL. Reaction Pathways of Hydrogen-Evolving Electrocatalysts: Electrochemical and Spectroscopic Studies of Proton-Coupled Electron Transfer Processes. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00778] [Citation(s) in RCA: 98] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Noémie Elgrishi
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
| | - Brian D. McCarthy
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
| | - Eric S. Rountree
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
| | - Jillian L. Dempsey
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
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15
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Amorati R, Baschieri A, Morroni G, Gambino R, Valgimigli L. Peroxyl Radical Reactions in Water Solution: A Gym for Proton-Coupled Electron-Transfer Theories. Chemistry 2016; 22:7924-34. [DOI: 10.1002/chem.201504492] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Indexed: 12/14/2022]
Affiliation(s)
- Riccardo Amorati
- Department of Chemistry “G. Ciamician”; University of Bologna; Via S. Giacomo 11 40126 Bologna Italy
| | - Andrea Baschieri
- Department of Chemistry “G. Ciamician”; University of Bologna; Via S. Giacomo 11 40126 Bologna Italy
| | - Gloria Morroni
- Department of Chemistry “G. Ciamician”; University of Bologna; Via S. Giacomo 11 40126 Bologna Italy
| | - Rossana Gambino
- Department of Chemistry “G. Ciamician”; University of Bologna; Via S. Giacomo 11 40126 Bologna Italy
| | - Luca Valgimigli
- Department of Chemistry “G. Ciamician”; University of Bologna; Via S. Giacomo 11 40126 Bologna Italy
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16
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Soetbeer J, Dongare P, Hammarström L. Marcus-type driving force correlations reveal the mechanism of proton-coupled electron transfer for phenols and [Ru(bpy) 3] 3+ in water at low pH. Chem Sci 2016; 7:4607-4612. [PMID: 30155108 PMCID: PMC6013771 DOI: 10.1039/c6sc00597g] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2016] [Accepted: 04/01/2016] [Indexed: 11/21/2022] Open
Abstract
We examined PCET between a series of phenol derivatives and photogenerated [Ru(bpy)3]3+ in low pH (≤4) water using the laser flash-quench technique.
Proton-coupled electron transfer (PCET) from tyrosine and other phenol derivatives in water is an important elementary reaction in chemistry and biology. We examined PCET between a series of phenol derivatives and photogenerated [Ru(bpy)3]3+ in low pH (≤4) water using the laser flash-quench technique. From an analysis of the kinetic data using a Marcus-type free energy relationship, we propose that our model system follows a stepwise electron transfer-proton transfer (ETPT) pathway with a pH independent rate constant at low pH in water. This is in contrast to the concerted or proton-first (PTET) mechanisms that often dominate at higher pH and/or with buffers as primary proton acceptors. The stepwise mechanism remains competitive despite a significant change in the pKa and redox potential of the phenols which leads to a span of rate constants from 1 × 105 to 2 × 109 M–1 s–1. These results support our previous studies which revealed separate mechanistic regions for PCET reactions and also assigned phenol oxidation by [Ru(bpy)3]3+ at low pH to a stepwise PCET mechanism.
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Affiliation(s)
- Janne Soetbeer
- Department of Chemistry - Ångström Laboratory , Uppsala University , Box 523, SE-751 20 , Uppsala , Sweden . ;
| | - Prateek Dongare
- Department of Chemistry - Ångström Laboratory , Uppsala University , Box 523, SE-751 20 , Uppsala , Sweden . ;
| | - Leif Hammarström
- Department of Chemistry - Ångström Laboratory , Uppsala University , Box 523, SE-751 20 , Uppsala , Sweden . ;
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17
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Yue Y, Novianti ML, Tessensohn ME, Hirao H, Webster RD. Optimizing the lifetimes of phenoxonium cations derived from vitamin E via structural modifications. Org Biomol Chem 2015; 13:11732-9. [PMID: 26480893 DOI: 10.1039/c5ob01868d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Systematic synthesis of a number of new phenolic compounds with structures similar to vitamin E led to the identification of several sterically hindered compounds that when electrochemically oxidised in acetonitrile in a -2e(-)/-H(+) process formed phenoxonium diamagnetic cations that were resistant to hydrolysis reactions. The reactivity of the phenoxonium ions was ascertained by performing cyclic voltammetric scans during the addition of carefully controlled quantities of water into acetonitrile solutions, with the data modelled using digital simulation techniques.
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Affiliation(s)
- Yanni Yue
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
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18
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Parween A, Mandal TK, Guillot R, Naskar S. Acid–base behavior, electrochemical properties and DFT study of redox non-innocent phenol–imidazole ligands and their Cu complexes. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.06.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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19
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Koo BJ, Huynh M, Halbach RL, Stubbe J, Nocera DG. Modulation of Phenol Oxidation in Cofacial Dyads. J Am Chem Soc 2015; 137:11860-3. [PMID: 26305909 DOI: 10.1021/jacs.5b05955] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The presentation of two phenols on a xanthene backbone is akin to the tyrosine dyad (Y730 and Y731) of ribonucleotide reductase. X-ray crystallography reveals that the two phenol moieties are cofacially disposed at 4.35 Å. Cyclic voltammetry reveals that phenol oxidation is modulated within the dyad, which exhibits a splitting of one-electron waves with the second oxidation of the phenol dyad occurring at larger positive potential than that of a typical phenol. In contrast, a single phenol appended to a xanthene exhibits a two-electron process, consistent with reported oxidation pathways of phenols in acetonitrile. The perturbation of the phenol potential by stacking is reminiscent of a similar effect for guanines stacked within DNA base pairs.
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Affiliation(s)
- Bon Jun Koo
- Department of Chemistry and Chemical Biology, Harvard University , 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Michael Huynh
- Department of Chemistry and Chemical Biology, Harvard University , 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Robert L Halbach
- Department of Chemistry and Chemical Biology, Harvard University , 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - JoAnne Stubbe
- Department of Chemistry, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Daniel G Nocera
- Department of Chemistry and Chemical Biology, Harvard University , 12 Oxford Street, Cambridge, Massachusetts 02138, United States
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20
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Sokolová R, Nycz JE, Ramešová Š, Fiedler J, Degano I, Szala M, Kolivoška V, Gál M. Electrochemistry and Spectroelectrochemistry of Bioactive Hydroxyquinolines: A Mechanistic Study. J Phys Chem B 2015; 119:6074-80. [DOI: 10.1021/acs.jpcb.5b00098] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Romana Sokolová
- J.
Heyrovský Institute of Physical Chemistry, v.v.i., The Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
| | - Jacek E. Nycz
- Institute
of Chemistry, University of Silesia, Szkolna 9, PL-40006 Katowice, Poland
| | - Šárka Ramešová
- J.
Heyrovský Institute of Physical Chemistry, v.v.i., The Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
| | - Jan Fiedler
- J.
Heyrovský Institute of Physical Chemistry, v.v.i., The Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
| | - Ilaria Degano
- Department
of Chemistry and Industrial Chemistry, University of Pisa, Via Moruzzi
3, 56124 Pisa, Italy
| | - Marcin Szala
- Institute
of Chemistry, University of Silesia, Szkolna 9, PL-40006 Katowice, Poland
| | - Viliam Kolivoška
- J.
Heyrovský Institute of Physical Chemistry, v.v.i., The Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
| | - Miroslav Gál
- J.
Heyrovský Institute of Physical Chemistry, v.v.i., The Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
- Department
of Inorganic Technology, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 81237 Bratislava, Slovakia
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21
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Hirao Y, Saito T, Kurata H, Kubo T. Isolation of a hydrogen-bonded complex based on the anthranol/anthroxyl pair: formation of a hydrogen-atom self-exchange system. Angew Chem Int Ed Engl 2015; 54:2402-5. [PMID: 25565433 DOI: 10.1002/anie.201410796] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Indexed: 11/08/2022]
Abstract
A hydrogen-bonded complex was successfully isolated as crystals from the anthranol/anthroxyl pair in the self-exchange proton-coupled electron transfer (PCET) reaction. The anthroxyl radical was stabilized by the introduction of a 9-anthryl group at the carbon atom at the 10-position. The hydrogen-bonded complex with anthranol self-assembled by π-π stacking to form a one-dimensional chain in the crystal. The conformation around the hydrogen bond was similar to that of the theoretically predicted PCET activated complex of the phenol/phenoxyl pair. X-ray crystal analyses revealed the self-exchange of a hydrogen atom via the hydrogen bond, indicating the activation of the self-exchange PCET reaction between anthranol and anthroxyl. Magnetic measurements revealed that magnetic ordering inside the one-dimensional chain caused the inactivation of the self-exchange reaction.
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Affiliation(s)
- Yasukazu Hirao
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan).
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22
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Hirao Y, Saito T, Kurata H, Kubo T. Isolation of a Hydrogen-Bonded Complex Based on the Anthranol/Anthroxyl Pair: Formation of a Hydrogen-Atom Self-Exchange System. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201410796] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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23
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Ramešová Š, Degano I, Sokolová R. Two oxidation pathways of bioactive flavonol rhamnazin under ambient conditions. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.04.074] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Et Taouil A, Brun E, Duchambon P, Blouquit Y, Gilles M, Maisonhaute E, Sicard-Roselli C. How protein structure affects redox reactivity: example of Human centrin 2. Phys Chem Chem Phys 2014; 16:24493-8. [DOI: 10.1039/c4cp03536d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Human centrin 2 is a protein very sensitive to oxidative stress. Protein reactivity is unraveled by gamma radiolysis and electrochemical techniques.
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Affiliation(s)
- Abdeslam Et Taouil
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 8235
- Laboratoire Interfaces et Systèmes Electrochimiques
- Paris, France
| | - Emilie Brun
- Laboratoire de Chimie Physique
- CNRS UMR 8000
- Université Paris-Sud
- Bât. 350
- 91405 Orsay Cedex, France
| | - Patricia Duchambon
- Plateforme Production Protéines Recombinantes
- Institut Curie-INSERM U759
- Université Paris-Sud
- 91405 Orsay Cedex, France
| | - Yves Blouquit
- Institut Curie-INSERM U759
- Université Paris-Sud
- 91405 Orsay Cedex, France
| | - Manon Gilles
- Laboratoire de Chimie Physique
- CNRS UMR 8000
- Université Paris-Sud
- Bât. 350
- 91405 Orsay Cedex, France
| | - Emmanuel Maisonhaute
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 8235
- Laboratoire Interfaces et Systèmes Electrochimiques
- Paris, France
| | - Cécile Sicard-Roselli
- Laboratoire de Chimie Physique
- CNRS UMR 8000
- Université Paris-Sud
- Bât. 350
- 91405 Orsay Cedex, France
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25
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Savéant JM. Concerted proton-electron transfers: fundamentals and recent developments. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2014; 7:537-560. [PMID: 25014349 DOI: 10.1146/annurev-anchem-071213-020315] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Proton-coupled electron transfers (PCET) are ubiquitous in natural and synthetic processes. This review focuses on reactions where the two events are concerted. Semiclassical models of such reactions allow their kinetic characterization through activation versus driving force relationships, estimates of reorganization energies, effects of the nature of the proton acceptor, and H/D kinetic isotope effect as well as their discrimination from stepwise pathways. Several homogeneous reactions (through stopped-flow and laser flash-quench techniques) and electrochemical processes are discussed in this framework. Once the way has been rid of the improper notion of pH-dependent driving force, water appears as a remarkable proton acceptor in terms of reorganization energy and pre-exponential factor, thanks to its H-bonded and H-bonding properties, similarly to purposely synthesized "H-bond train" molecules. The most recent developments are in modeling and description of emblematic concerted proton-electron transfer (CPET) reactions associated with the breaking of a heavy-atom bond in an all-concerted process.
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Affiliation(s)
- Jean-Michel Savéant
- Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche, Université Paris Diderot, Sorbonne Paris Cité, CNRS 7591, 75205 Paris Cedex 13, France;
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26
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Investigation of the electrochemical behavior of some dihydroxybenzoic acids in aqueous solution. MONATSHEFTE FUR CHEMIE 2013. [DOI: 10.1007/s00706-013-1031-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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27
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Irebo T, Zhang MT, Markle TF, Scott AM, Hammarström L. Spanning four mechanistic regions of intramolecular proton-coupled electron transfer in a Ru(bpy)3(2+)-tyrosine complex. J Am Chem Soc 2012; 134:16247-54. [PMID: 22909089 DOI: 10.1021/ja3053859] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Proton-coupled electron transfer (PCET) from tyrosine (TyrOH) to a covalently linked [Ru(bpy)(3)](2+) photosensitizer in aqueous media has been systematically reinvestigated by laser flash-quench kinetics as a model system for PCET in radical enzymes and in photochemical energy conversion. Previous kinetic studies on Ru-TyrOH molecules (Sjödin et al. J. Am. Chem. Soc. 2000, 122, 3932; Irebo et al. J. Am. Chem. Soc. 2007, 129, 15462) have established two mechanisms. Concerted electron-proton (CEP) transfer has been observed when pH < pK(a)(TyrOH), which is pH-dependent but not first-order in [OH(-)] and not dependent on the buffer concentration when it is sufficiently low (less than ca. 5 mM). In addition, the pH-independent rate constant for electron transfer from tyrosine phenolate (TyrO(-)) was reported at pH >10. Here we compare the PCET rates and kinetic isotope effects (k(H)/k(D)) of four Ru-TyrOH molecules with varying Ru(III/II) oxidant strengths over a pH range of 1-12.5. On the basis of these data, two additional mechanistic regimes were observed and identified through analysis of kinetic competition and kinetic isotope effects (KIE): (i) a mechanism dominating at low pH assigned to a stepwise electron-first PCET and (ii) a stepwise proton-first PCET with OH(-) as proton acceptor that dominates around pH = 10. The effect of solution pH and electrochemical potential of the Ru(III/II) oxidant on the competition between the different mechanisms is discussed. The systems investigated may serve as models for the mechanistic diversity of PCET reactions in general with water (H(2)O, OH(-)) as primary proton acceptor.
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Affiliation(s)
- Tania Irebo
- Photochemistry and Molecular Science, Department of Chemistry, Ångström Laboratory, Uppsala University, Box 532, SE-751 20 Uppsala, Sweden
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28
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Weinberg DR, Gagliardi CJ, Hull JF, Murphy CF, Kent CA, Westlake BC, Paul A, Ess DH, McCafferty DG, Meyer TJ. Proton-Coupled Electron Transfer. Chem Rev 2012; 112:4016-93. [DOI: 10.1021/cr200177j] [Citation(s) in RCA: 1125] [Impact Index Per Article: 93.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- David R. Weinberg
- Department
of Chemistry, University
of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290,
United States
- Department of Physical and Environmental
Sciences, Colorado Mesa University, 1100 North Avenue, Grand Junction,
Colorado 81501-3122, United States
| | - Christopher J. Gagliardi
- Department
of Chemistry, University
of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290,
United States
| | - Jonathan F. Hull
- Department
of Chemistry, University
of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290,
United States
| | - Christine Fecenko Murphy
- Department
of Chemistry, B219
Levine Science Research Center, Box 90354, Duke University, Durham,
North Carolina 27708-0354, United States
| | - Caleb A. Kent
- Department
of Chemistry, University
of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290,
United States
| | - Brittany C. Westlake
- The American Chemical Society,
1155 Sixteenth Street NW, Washington, District of Columbia 20036,
United States
| | - Amit Paul
- Department
of Chemistry, University
of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290,
United States
| | - Daniel H. Ess
- Department
of Chemistry, University
of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290,
United States
| | - Dewey Granville McCafferty
- Department
of Chemistry, B219
Levine Science Research Center, Box 90354, Duke University, Durham,
North Carolina 27708-0354, United States
| | - Thomas J. Meyer
- Department
of Chemistry, University
of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290,
United States
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29
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Tan SLJ, Webster RD. Electrochemically Induced Chemically Reversible Proton-Coupled Electron Transfer Reactions of Riboflavin (Vitamin B2). J Am Chem Soc 2012; 134:5954-64. [DOI: 10.1021/ja300191u] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Serena L. J. Tan
- Division of Chemistry
and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371
| | - Richard D. Webster
- Division of Chemistry
and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371
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30
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Warren JJ, Winkler JR, Gray HB. Redox properties of tyrosine and related molecules. FEBS Lett 2012; 586:596-602. [PMID: 22210190 PMCID: PMC3298607 DOI: 10.1016/j.febslet.2011.12.014] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Revised: 12/04/2011] [Accepted: 12/12/2011] [Indexed: 11/25/2022]
Abstract
Redox reactions of tyrosine play key roles in many biological processes, including water oxidation and DNA synthesis. We first review the redox properties of tyrosine (and other phenols) in small molecules and related polypeptides, then report work on (H20)/(Y48)-modified Pseudomonas aeruginosa azurin. The crystal structure of this protein (1.18Å resolution) shows that H20 is strongly hydrogen bonded to Y48 (2.7-2.8Å tyrosine-O to histidine-N distance). A firm conclusion is that proper tuning of the tyrosine potential by a proton-accepting base is critical for biological redox functions.
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Affiliation(s)
- Jeffrey J. Warren
- Beckman Institute, California Institute of Technology, Pasadena, CA 91125
| | - Jay R. Winkler
- Beckman Institute, California Institute of Technology, Pasadena, CA 91125
| | - Harry B. Gray
- Beckman Institute, California Institute of Technology, Pasadena, CA 91125
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31
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Ramešová Š, Sokolová R, Degano I, Bulíčková J, Žabka J, Gál M. On the stability of the bioactive flavonoids quercetin and luteolin under oxygen-free conditions. Anal Bioanal Chem 2011; 402:975-82. [DOI: 10.1007/s00216-011-5504-3] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Revised: 10/06/2011] [Accepted: 10/13/2011] [Indexed: 11/25/2022]
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32
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Tyurin VY, Meleshonkova NN, Dolganov AV, Glukhova AP, Milaeva ER. Electrochemical method in determination of antioxidative activity using ferrocene derivatives as examples. Russ Chem Bull 2011. [DOI: 10.1007/s11172-011-0100-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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33
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Zhang MT, Hammarström L. Proton-coupled electron transfer from tryptophan: a concerted mechanism with water as proton acceptor. J Am Chem Soc 2011; 133:8806-9. [PMID: 21500853 DOI: 10.1021/ja201536b] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The mechanism of proton-coupled electron transfer (PCET) from tyrosine in enzymes and synthetic model complexes is under intense discussion, in particular the pH dependence of the PCET rate with water as proton acceptor. Here we report on the intramolecular oxidation kinetics of tryptophan derivatives linked to [Ru(bpy)(3)](2+) units with water as proton acceptor, using laser flash-quench methods. It is shown that tryptophan oxidation can proceed not only via a stepwise electron-proton transfer (ETPT) mechanism that naturally shows a pH-independent rate, but also via another mechanism with a pH-dependent rate and higher kinetic isotope effect that is assigned to concerted electron-proton transfer (CEP). This is in contrast to current theoretical models, which predict that CEP from tryptophan with water as proton acceptor can never compete with ETPT because of the energetically unfavorable PT part (pK(a)(Trp(•)H(+)) = 4.7 ≫ pK(a)(H(3)O(+)) ≈ -1.5). The moderate pH dependence we observe for CEP cannot be explained by first-order reactions with OH(-) or the buffers and is similar to what has been demonstrated for intramolecular PCET in [Ru(bpy)(3)](3+)-tyrosine complexes (Sjödin, M.; et al. J. Am. Chem. Soc.2000, 122, 3932. Irebo, T.; et al. J. Am. Chem. Soc.2007, 129, 15462). Our results suggest that CEP with water as the proton acceptor proves a general feature of amino acid oxidation, and provide further experimental support for understanding of the PCET process in detail.
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Affiliation(s)
- Ming-Tian Zhang
- Department of Photochemistry and Molecular Science, Uppsala University, Box 523, SE-751 20 Uppsala, Sweden
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34
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Bonin J, Costentin C, Louault C, Robert M, Savéant JM. Water (in water) as an intrinsically efficient proton acceptor in concerted proton electron transfers. J Am Chem Soc 2011; 133:6668-74. [PMID: 21476550 DOI: 10.1021/ja110935c] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The oxidation of PhOH in water by photochemically generated Ru(III)(bpy)(3) is taken as prototypal example disclosing the special character of water, in the solvent water, as proton acceptor in concerted proton-electron transfer reactions. The variation of the rate constant with temperature and driving force, as well as the variation of the H/D kinetic isotope effect with temperature, allowed the determination of the reaction mechanism characterized by three intrinsic parameters, the reorganization energy, a pre-exponential factor measuring the vibronic coupling of electronic states at equilibrium distance, and a distance-sensitivity parameter. Analysis of these characteristics and comparison with a standard base, hydrogen phosphate, revealed that electron transfer is concerted with a Grotthus-type proton translocation, leading to a charge delocalized over a cluster involving several water molecules. A mechanism is thus uncovered that may help in understanding how protons could be transported along water chains over large distances in concert with electron transfer in biological systems.
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Affiliation(s)
- Julien Bonin
- Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS No 7591, Université Paris Diderot, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
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35
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Tan YS, Chen S, Hong WM, Kan JM, Kwek ESH, Lim SY, Lim ZH, Tessensohn ME, Zhang Y, Webster RD. The role of low levels of water in the electrochemical oxidation of α-tocopherol (vitamin E) and other phenols in acetonitrile. Phys Chem Chem Phys 2011; 13:12745-54. [DOI: 10.1039/c1cp20579j] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Warren JJ, Tronic TA, Mayer JM. Thermochemistry of proton-coupled electron transfer reagents and its implications. Chem Rev 2010; 110:6961-7001. [PMID: 20925411 PMCID: PMC3006073 DOI: 10.1021/cr100085k] [Citation(s) in RCA: 1203] [Impact Index Per Article: 85.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jeffrey J. Warren
- Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195-1700
| | - Tristan A. Tronic
- Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195-1700
| | - James M. Mayer
- Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195-1700
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37
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Costentin C, Robert M, Savéant JM. Update 1 of: Electrochemical Approach to the Mechanistic Study of Proton-Coupled Electron Transfer. Chem Rev 2010; 110:PR1-40. [DOI: 10.1021/cr100038y] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Cyrille Costentin
- Laboratoire d’Electrochimie Moléculaire, Unité Mixte de Recherche Université, CNRS No. 7591, Université Paris Diderot, 15 rue Jean de Baïf, 75013 Paris, France
- This is a Chemical Reviews Perennial Review. The root paper of this title was published in Chem. Rev. 2008, 108 (7), 2145−2179, DOI: 10.1021/cr068065t; Published (Web) July 11, 2008. Updates to the text appear in red type
| | - Marc Robert
- Laboratoire d’Electrochimie Moléculaire, Unité Mixte de Recherche Université, CNRS No. 7591, Université Paris Diderot, 15 rue Jean de Baïf, 75013 Paris, France
- This is a Chemical Reviews Perennial Review. The root paper of this title was published in Chem. Rev. 2008, 108 (7), 2145−2179, DOI: 10.1021/cr068065t; Published (Web) July 11, 2008. Updates to the text appear in red type
| | - Jean-Michel Savéant
- Laboratoire d’Electrochimie Moléculaire, Unité Mixte de Recherche Université, CNRS No. 7591, Université Paris Diderot, 15 rue Jean de Baïf, 75013 Paris, France
- This is a Chemical Reviews Perennial Review. The root paper of this title was published in Chem. Rev. 2008, 108 (7), 2145−2179, DOI: 10.1021/cr068065t; Published (Web) July 11, 2008. Updates to the text appear in red type
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38
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Affiliation(s)
- Jillian L. Dempsey
- Beckman Institute, California Institute of Technology, Pasadena, CA 91125
| | - Jay R. Winkler
- Beckman Institute, California Institute of Technology, Pasadena, CA 91125
| | - Harry B. Gray
- Beckman Institute, California Institute of Technology, Pasadena, CA 91125
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39
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Costentin C, Robert M, Savéant JM. Concerted proton-electron transfers: electrochemical and related approaches. Acc Chem Res 2010; 43:1019-29. [PMID: 20232879 DOI: 10.1021/ar9002812] [Citation(s) in RCA: 190] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Proton-coupled electron transfers (PCETs) are omnipresent in natural and artificial chemical processes. Given the contemporary challenges associated with energy conversion, pollution abatement, and the development of high-performance sensors, a greater understanding of the mechanisms that underlie the practical efficiency of PCETs is a timely research topic. In contrast to hydrogen-atom transfers, proton and electron transfers involve different centers in PCET reactions. The reaction may go through an electron- or proton-transfer intermediate, giving rise to the electron-proton transfer (EPT) and the proton-electron transfer (PET) pathways. When the proton and electron transfers are concerted (the CPET pathway), the high-energy intermediates of the stepwise pathways are bypassed, although this thermodynamic benefit may have a kinetic cost. The primary task of kinetics-based mechanism analysis is therefore to distinguish the three pathways, quantifying the factors that govern the competition between them, which requires modeling of CPET reactivity. CPET models of varying sophistication have appeared, but the large number of parameters involved and the uncertainty of the quantum chemical calculations they may have to resort to make experimental confrontation and inspiration a necessary component of model testing and refinement. Electrochemical PCETs are worthy of particular attention, if only because most applications in which PCET mechanisms are operative involve collection or injection of electricity through electrodes. More fundamentally, changing the electrode potential is an easy and continuous means of varying the driving force of the reaction, whereas the current flowing through the electrode is a straightforward measure of its rate. Consequently, the current-potential response in nondestructive techniques (such as cyclic voltammetry) can be read as an activation-driving force relationship, provided the contribution of diffusion has been taken into account. Intrinsic properties (properties at zero driving force) are consequently a natural outcome of the electrochemical approach. In this Account, we begin by examining the modeling of CPET reactions and then describe illustrating experimental examples inspired by two biological systems, photosystem II and superoxide dismutase. One series of studies examined the oxidation of phenols with, as proton acceptor, either an attached nitrogen base or water (in water as solvent). Another addressed interconversion of aquo-hydroxo-oxo couples of transition metal complexes, using osmium complexes as prototypes. Finally, the reduction of superoxide ion, which is closely related to its dismutation, allowed the observation and rationalization of the remarkable properties of water as a proton donor. Water is also an exceptional proton acceptor in the oxidation of phenols, requiring very small reorganization energies, both in the electrochemical and homogeneous cases. These varied examples reveal general features of PCET reactions that may serve as guidelines for future studies, suggesting that research emphasis might be profitably directed toward new biological systems on the one hand and on the role of hydrogen bonding and hydrogen-bonded environments (such as water or proteins) on the other.
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Affiliation(s)
- Cyrille Costentin
- Laboratoire d’Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS No 7591, Université Paris Diderot, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Marc Robert
- Laboratoire d’Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS No 7591, Université Paris Diderot, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
| | - Jean-Michel Savéant
- Laboratoire d’Electrochimie Moléculaire, Unité Mixte de Recherche Université - CNRS No 7591, Université Paris Diderot, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
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Costentin C, Robert M, Savéant JM. Concerted proton-electron transfers in the oxidation of phenols. Phys Chem Chem Phys 2010; 12:11179-90. [PMID: 20625575 DOI: 10.1039/c0cp00063a] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The oxidation of phenols is an emblematic example where the mechanisms of proton-coupled electron transfers could be investigated in depth thanks to non-destructive electrochemical techniques such as cyclic voltammetry. A concerted proton-electron transfer could then be shown to be the prevailing pathway in the oxidation of amino-phenols mimicking the tyrosine-histidine couple in Photosystem II. The theoretical model developed on this occasion leads to the introduction of two main parameters characterizing reorganization of heavy atoms in the reactant and in the solvent on the one hand and proton tunneling on the other. When water used as the solvent is at the same time the proton acceptor, the concerted pathway also predominates. It is characterized by a remarkably large standard rate constant both in electrochemistry and in the oxidation by homogenous reactants. Another aspect of the importance of H-bonding in concerted proton-electron transfer is provided by H-bond relays that efficiently mediate the electron transfer-triggered transport of protons between two sites over large distances thanks to the displacement of two protons concerted with electron transfer. Intermediary protonation of the relay is avoided by fine tuning of its H-bond acceptor and donor properties.
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Affiliation(s)
- Cyrille Costentin
- Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université-CNRS No 7591, Université Paris Diderot, Bâtiment Lavoisier, 15 rue Jean de Baïf, 75205 Paris Cedex 13, France
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Moore GF, Hambourger M, Kodis G, Michl W, Gust D, Moore TA, Moore AL. Effects of protonation state on a tyrosine-histidine bioinspired redox mediator. J Phys Chem B 2010; 114:14450-7. [PMID: 20476732 DOI: 10.1021/jp101592m] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The conversion of tyrosine to the corresponding tyrosyl radical in photosystem II (PSII) is an example of proton-coupled electron transfer. Although the tyrosine moiety (Tyr(Z)) is known to function as a redox mediator between the photo-oxidized primary donor (P680(•+)) and the Mn-containing oxygen-evolving complex, the protonation states involved in the course of the reaction remain an active area of investigation. Herein, we report on the optical, structural, and electrochemical properties of tyrosine-histidine constructs, which model the function of their naturally occurring counterparts in PSII. Electrochemical studies show that the phenoxyl/phenol couple of the model is chemically reversible and thermodynamically capable of water oxidation. Studies under acidic and basic conditions provide clear evidence that an ionizable proton controls the electrochemical potential of the tyrosine-histidine mimic and that an exogenous base or acid can be used to generate a low-potential or high-potential mediator, respectively. The phenoxyl/phenoxide couple associated with the low-potential mediator is thermodynamically incapable of water oxidation, whereas the relay associated with the high-potential mediator is thermodynamically incapable of reducing an attached photoexcited porphyrin. These studies provide insight regarding the mechanistic role of the tyrosine-histidine complex in water oxidation and strategies for making use of hydrogen bonds to affect the coupling between proton and electron transfer in artificial photosynthetic systems.
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Affiliation(s)
- Gary F Moore
- Center for Bioenergy and Photosynthesis and Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA
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The electrochemical approach to concerted proton--electron transfers in the oxidation of phenols in water. Proc Natl Acad Sci U S A 2009; 106:18143-8. [PMID: 19822746 DOI: 10.1073/pnas.0910065106] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Establishing mechanisms and intrinsic reactivity in the oxidation of phenol with water as the proton acceptor is a fundamental task relevant to many reactions occurring in natural systems. Thanks to the easy measure of the reaction kinetics by the current and the setting of the driving force by the electrode potential, the electrochemical approach is particularly suited to this endeavor. Despite challenging difficulties related to self-inhibition blocking the electrode surface, experimental conditions were established that allowed a reliable analysis of the thermodynamics and mechanisms of the proton-coupled electron-transfer oxidation of phenol to be carried out by means of cyclic voltammetry. The thermodynamic characterization was conducted in buffer media whereas the mechanisms were revealed in unbuffered water. Unambiguous evidence of a concerted proton-electron transfer mechanism, with water as proton acceptor, was thus gathered by simulation of the experimental data with appropriately derived theoretical relationships, leading to the determination of a remarkably large intrinsic rate constant. The same strategy also allowed the quantitative analysis of the competition between the concerted proton-electron transfer pathway and an OH(-)-triggered stepwise pathway (proton transfer followed by electron transfer) at high pHs. Investigation of the passage between unbuffered and buffered media with the example of the PO(4)H(2)(-)/PO(4)H(2-) couple revealed the prevalence of a mechanism involving a proton transfer preceding an electron transfer over a PO(4)H(2-)-triggered concerted process.
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Affiliation(s)
- My Hang V Huynh
- DE-1: High Explosive Science and Technology Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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