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Song C, Wang Q, Wen R, Tang Q, Luo Z, Yuan Z. A Long-Life and Excellent Rate-Capability Aqueous Zn-Benzoquinone Battery Enabled by Iodine-Catalyzed Cathode. SMALL METHODS 2023:e2300809. [PMID: 37798918 DOI: 10.1002/smtd.202300809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 08/29/2023] [Indexed: 10/07/2023]
Abstract
Benzoquinone (BQ) is considered to be a desirable cathode material for aqueous zinc-based batteries. The major limitations of BQ electrode are the severe sublimation and poor electrical conductivity, which results in serious mass loss during electrode preparation and inferior rate performance. In this study, iodine (I2 ) species are utilized as an efficient catalyst for the highly reversible conversion of BQ/BQ2- couple in the Zn-BQ battery system, wherein N-doped porous carbon is employed as a host material for anchoring the BQ molecule. In the combination electrode (denoted as BQ-I@NPC) with 1wt% I2 additive where I2 can serve as a carrier to accelerates the Zn2+ transmission, and reduce the voltage hysteresis of the electrode. As a result, the BQ-I@NPC cathode delivers a high specific capacity of ≈482 mAh g-1 at 0.25 A g-1 , realizing a high energy density of 545 Wh kg-1 (based on BQ), which is the highest values among reported organic cathode materials for aqueous Zn-based batteries. Also, a high BQ loading (8 mg cm-2 ) can be attained, and achieving a superior cycling stability with a capacity retention of ≈80% after 20,000 times at 10 C. The work proposes an effective approach toward high performance organic electrode materials.
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Affiliation(s)
- Chunlai Song
- School of Materials Science and Engineering, Tianjin Key Lab of Photoelectric Materials & Devices, and Key Laboratory of Display Materials and Photoelectric Devices (Ministry of Education), Tianjin University of Technology, No. 391 Binshuixi Road, Tianjin, 300384, P. R. China
| | - Qiang Wang
- School of Materials Science and Engineering, Tianjin Key Lab of Photoelectric Materials & Devices, and Key Laboratory of Display Materials and Photoelectric Devices (Ministry of Education), Tianjin University of Technology, No. 391 Binshuixi Road, Tianjin, 300384, P. R. China
| | - Ruihang Wen
- School of Materials Science and Engineering, Tianjin Key Lab of Photoelectric Materials & Devices, and Key Laboratory of Display Materials and Photoelectric Devices (Ministry of Education), Tianjin University of Technology, No. 391 Binshuixi Road, Tianjin, 300384, P. R. China
| | - Qiben Tang
- School of Materials Science and Engineering, Tianjin Key Lab of Photoelectric Materials & Devices, and Key Laboratory of Display Materials and Photoelectric Devices (Ministry of Education), Tianjin University of Technology, No. 391 Binshuixi Road, Tianjin, 300384, P. R. China
| | - Zhiqiang Luo
- School of Materials Science and Engineering, Tianjin Key Lab of Photoelectric Materials & Devices, and Key Laboratory of Display Materials and Photoelectric Devices (Ministry of Education), Tianjin University of Technology, No. 391 Binshuixi Road, Tianjin, 300384, P. R. China
| | - Zhihao Yuan
- School of Materials Science and Engineering, Tianjin Key Lab of Photoelectric Materials & Devices, and Key Laboratory of Display Materials and Photoelectric Devices (Ministry of Education), Tianjin University of Technology, No. 391 Binshuixi Road, Tianjin, 300384, P. R. China
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2
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Ameixa J, Arthur-Baidoo E, Pereira-da-Silva J, Ončák M, Ruivo J, Varella MDN, Ferreira da Silva F, Denifl S. Parent anion radical formation in coenzyme Q 0: Breaking ubiquinone family rules. Comput Struct Biotechnol J 2022; 21:346-353. [PMID: 36582437 PMCID: PMC9792397 DOI: 10.1016/j.csbj.2022.12.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 12/06/2022] [Accepted: 12/06/2022] [Indexed: 12/13/2022] Open
Abstract
We report electron attachment (EA) measurements for the parent anion radical formation from coenzyme Q0 (CoQ0) at low electron energies (<2 eV) along with quantum chemical calculations. CoQ0 may be considered a prototype for the electron withdrawing properties of the larger CoQ n molecules, in particular ubiquinone (CoQ10), an electron carrier in aerobic cell respiration. Herein, we show that the mechanisms for the parent anion radical formation of CoQ0 and CoQ n (n = 1,2,4) are remarkably distinct. Reported EA data for CoQ1, CoQ2, CoQ4 and para-benzoquinone indicated stabilization of the parent anion radicals around 1.2-1.4 eV. In contrast, we observe for the yield of the parent anion radical of CoQ0 a sharp peak at ∼ 0 eV, a shoulder at 0.07 eV and a peak around 0.49 eV. Although the mechanisms for the latter feature remain unclear, our calculations suggest that a dipole bound state (DBS) would account for the lower energy signals. Additionally, the isoprenoid side chains in CoQ n (n = 1,2,4) molecules seem to influence the DBS formation for these compounds. In contrast, the side chains enhance the parent anion radical stabilization around 1.4 eV. The absence of parent anion radical formation around 1.4 eV for CoQ0 can be attributed to the short auto-ionization lifetimes. The present results shed light on the underappreciated role played by the side chains in the stabilization of the parent anion radical. The isoprenoid tails should be viewed as co-responsible for the electron-accepting properties of ubiquinone, not mere spectators of electron transfer reactions.
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Affiliation(s)
- J. Ameixa
- Institut für Ionenphysik und Angewandte Physik, Leopold-Franzens Universität Innsbruck, Technikerstraße 25/3, 6020 Innsbruck, Austria,CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal,Center for Molecular Biosciences (CMBI), Leopold-Franzens Universität Innsbruck, Technikerstraße 25/3, 6020 Innsbruck, Austria
| | - E. Arthur-Baidoo
- Institut für Ionenphysik und Angewandte Physik, Leopold-Franzens Universität Innsbruck, Technikerstraße 25/3, 6020 Innsbruck, Austria,Center for Molecular Biosciences (CMBI), Leopold-Franzens Universität Innsbruck, Technikerstraße 25/3, 6020 Innsbruck, Austria
| | - J. Pereira-da-Silva
- CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - M. Ončák
- Institut für Ionenphysik und Angewandte Physik, Leopold-Franzens Universität Innsbruck, Technikerstraße 25/3, 6020 Innsbruck, Austria
| | - J.C. Ruivo
- Institute of Physics, University of São Paulo, Rua do Matão 1731, 05508-090 São Paulo, Brazil
| | - M.T. do N. Varella
- Institute of Physics, University of São Paulo, Rua do Matão 1731, 05508-090 São Paulo, Brazil,Corresponding authors at: Institut für Ionenphysik und Angewandte Physik, Leopold-Franzens Universität Innsbruck, Technikerstraße 25/3, 6020 Innsbruck, Austria (S. Denifl).
| | - F. Ferreira da Silva
- CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal,Corresponding authors at: Institut für Ionenphysik und Angewandte Physik, Leopold-Franzens Universität Innsbruck, Technikerstraße 25/3, 6020 Innsbruck, Austria (S. Denifl).
| | - S. Denifl
- Institut für Ionenphysik und Angewandte Physik, Leopold-Franzens Universität Innsbruck, Technikerstraße 25/3, 6020 Innsbruck, Austria,Center for Molecular Biosciences (CMBI), Leopold-Franzens Universität Innsbruck, Technikerstraße 25/3, 6020 Innsbruck, Austria,Corresponding authors at: Institut für Ionenphysik und Angewandte Physik, Leopold-Franzens Universität Innsbruck, Technikerstraße 25/3, 6020 Innsbruck, Austria (S. Denifl).
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3
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Stockett MH, Bull JN, Schmidt HT, Zettergren H. Statistical vibrational autodetachment and radiative cooling rates of para-benzoquinone. Phys Chem Chem Phys 2022; 24:12002-12010. [PMID: 35535575 DOI: 10.1039/d2cp00490a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We report measurements of the statistical vibrational autodetachment (VAD, also called thermionic emission) and radiative cooling rates of isolated para-benzoquinone (pBQ, C6H4O2) radical anions using the cryogenic electrostatic ion storage ring facility DESIREE. The results are interpreted using master equation simulations with rate coefficients calculated using statistical detailed balance theory. The VAD rate is determined by measuring the time-dependent yield of neutral pBQ due to spontaneous electron emission from a highly-excited ensemble of anions formed in an electron-attachment ion source. Competition with radiative cooling quenches the VAD rate after a critical time of τc = 11.00(5) ms. Master equation simulations which reproduce the VAD yield provide an estimate of the initial effective vibrational temperature of the ions of 1100(20) K, and provide insight into the anion formation scenario. A second measurement of the radiative cooling rate of pBQ- stored for up to 0.5 s was achieved using time-dependent photodetachment action spectroscopy across the 2Au ← 2B2g and 2B2u ← 2B2g transitions. The rate at which hot-band contributions fade from the action spectrum is quantified by non-negative matrix factorisation. This is found to be commensurate with the average vibrational energy extracted from the simulations, with 1/e lifetimes of 0.16(3) s and 0.1602(7) s, respectively. Implications for astrochemistry are discussed.
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Affiliation(s)
- Mark H Stockett
- Department of Physics, Stockholm University, Stockholm, Sweden.
| | - James N Bull
- School of Chemistry, University of East Anglia, Norwich, UK
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4
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Ameixa J, Arthur‐Baidoo E, Pereira‐da‐Silva J, Ruivo JC, T. do N. Varella M, Beyer MK, Ončák M, Ferreira da Silva F, Denifl S. Formation of Temporary Negative Ions and Their Subsequent Fragmentation upon Electron Attachment to CoQ 0 and CoQ 0 H 2. Chemphyschem 2022; 23:e202100834. [PMID: 35146888 PMCID: PMC9306667 DOI: 10.1002/cphc.202100834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 01/05/2022] [Indexed: 11/06/2022]
Abstract
Ubiquinone molecules have a high biological relevance due to their action as electron carriers in the mitochondrial electron transport chain. Here, we studied the dissociative interaction of free electrons with CoQ0 , the smallest ubiquinone derivative with no isoprenyl units, and its fully reduced form, 2,3-dimethoxy-5-methylhydroquinone (CoQ0 H2 ), an ubiquinol derivative. The anionic products produced upon dissociative electron attachment (DEA) were detected by quadrupole mass spectrometry and studied theoretically through quantum chemical and electron scattering calculations. Despite the structural similarity of the two studied molecules, remarkably only a few DEA reactions are present for both compounds, such as abstraction of a neutral hydrogen atom or the release of a negatively charged methyl group. While the loss of a neutral methyl group represents the most abundant reaction observed in DEA to CoQ0 , this pathway is not observed for CoQ0 H2 . Instead, the loss of a neutral OH radical from the CoQ0 H2 temporary negative ion is observed as the most abundant reaction channel. Overall, this study gives insights into electron attachment properties of simple derivatives of more complex molecules found in biochemical pathways.
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Affiliation(s)
- João Ameixa
- Institut für Ionenphysik und Angewandte PhysikLeopold-Franzens Universität InnsbruckTechnikerstraße 256020InnsbruckAustria,Center for Biomolecular Sciences Innsbruck (CMBI)Leopold-Franzens Universität InnsbruckTechnikerstraße 256020InnsbruckAustria,Centre of Physics and Technological ResearchDepartamento de FísicaFaculdade de Ciências e TecnologiaUniversidade NOVA de Lisboa2829-516CaparicaPortugal
| | - Eugene Arthur‐Baidoo
- Institut für Ionenphysik und Angewandte PhysikLeopold-Franzens Universität InnsbruckTechnikerstraße 256020InnsbruckAustria,Center for Biomolecular Sciences Innsbruck (CMBI)Leopold-Franzens Universität InnsbruckTechnikerstraße 256020InnsbruckAustria
| | - João Pereira‐da‐Silva
- Centre of Physics and Technological ResearchDepartamento de FísicaFaculdade de Ciências e TecnologiaUniversidade NOVA de Lisboa2829-516CaparicaPortugal
| | - Júlio C. Ruivo
- Instituto de FísicaUniversidade de São PauloRua do Matão 173105508-090São PauloBrazil
| | | | - Martin K. Beyer
- Institut für Ionenphysik und Angewandte PhysikLeopold-Franzens Universität InnsbruckTechnikerstraße 256020InnsbruckAustria
| | - Milan Ončák
- Institut für Ionenphysik und Angewandte PhysikLeopold-Franzens Universität InnsbruckTechnikerstraße 256020InnsbruckAustria
| | - Filipe Ferreira da Silva
- Centre of Physics and Technological ResearchDepartamento de FísicaFaculdade de Ciências e TecnologiaUniversidade NOVA de Lisboa2829-516CaparicaPortugal
| | - Stephan Denifl
- Institut für Ionenphysik und Angewandte PhysikLeopold-Franzens Universität InnsbruckTechnikerstraße 256020InnsbruckAustria,Center for Biomolecular Sciences Innsbruck (CMBI)Leopold-Franzens Universität InnsbruckTechnikerstraße 256020InnsbruckAustria
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5
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Giacomozzi L, Kjær C, Brøndsted Nielsen S, Ashworth EK, Bull JN, Stockett MH. Non-statistical fragmentation in photo-activated flavin mononucleotide anions. J Chem Phys 2021; 155:044305. [PMID: 34340366 DOI: 10.1063/5.0056415] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The spectroscopy and photo-induced dissociation of flavin mononucleotide anions in vacuo are investigated over the 300-500 nm wavelength range. Comparison of the dependence of fragment ion yields as a function of deposited photon energy with calculated dissociation energies and collision-induced dissociation measurements performed under single-collision conditions suggests that a substantial fraction of photo-activated ions decompose through non-statistical fragmentation pathways. Among these pathways is the dominant photo-induced fragmentation channel, the loss of a fragment identified as formylmethylflavin. The fragment ion specific action spectra reveal electronic transition energies close to those for flavins in solution and previously published gas-phase measurements, although the photo-fragment yield upon excitation of the S2 ← S0 transition appears to be suppressed.
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Affiliation(s)
| | - Christina Kjær
- Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark
| | | | - Eleanor K Ashworth
- School of Chemistry, University of East Anglia, Norwich Research Park, Norwich, United Kingdom
| | - James N Bull
- School of Chemistry, University of East Anglia, Norwich Research Park, Norwich, United Kingdom
| | - Mark H Stockett
- Department of Physics, Stockholm University, Stockholm, Sweden
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6
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Wiloch MZ, Kuna E, Kosiorek S, Sashuk V, Jönsson‐Niedziółka M. Spectroelectrochemical Behaviour of 1,4‐Dimethoxypillar[5]arene (P5A) and its Monomer in Different Organic Solvents. ChemElectroChem 2021. [DOI: 10.1002/celc.202100257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Magdalena Z. Wiloch
- Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
| | - Ewelina Kuna
- Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
| | - Sandra Kosiorek
- Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
| | - Volodymyr Sashuk
- Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
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7
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Mensa-Bonsu G, Wilson MR, Tozer DJ, Verlet JRR. Photoelectron spectroscopy of para-benzoquinone cluster anions. J Chem Phys 2019; 151:204302. [PMID: 31779316 DOI: 10.1063/1.5132391] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
The photoelectron spectra of para-benzoquinone radical cluster anions, (pBQ)n - (n = 2-4), taken at hv = 4.00 eV are presented and compared with the photoelectron spectrum of the monomer (n = 1). For all clusters, a direct detachment peak can be identified, and the incremental increase in the vertical detachment energy of ∼0.4 eV n-1 predominantly reflects the increase in cohesion energy as the cluster size increases. For all clusters, excitation also leads to low energy electrons that are produced by thermionic emission from ground electronic state anionic species, indicating that resonances are excited at this photon energy. For n = 3 and 4, photoelectron features at lower binding energy are observed which can be assigned to photodetachment from pBQ- for n = 3 and both pBQ- and (pBQ)2 - for n = 4. These observations indicate that the cluster dissociates on the time scale of the laser pulse (∼5 ns). The present results are discussed in the context of related quinone cluster anions.
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Affiliation(s)
- Golda Mensa-Bonsu
- Department of Chemistry, Durham University, Durham DH1 3LE, United Kingdom
| | - Mark R Wilson
- Department of Chemistry, Durham University, Durham DH1 3LE, United Kingdom
| | - David J Tozer
- Department of Chemistry, Durham University, Durham DH1 3LE, United Kingdom
| | - Jan R R Verlet
- Department of Chemistry, Durham University, Durham DH1 3LE, United Kingdom
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8
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Mensa-Bonsu G, Lietard A, Verlet JRR. Enhancement of electron accepting ability of para-benzoquinone by a single water molecule. Phys Chem Chem Phys 2019; 21:21689-21692. [PMID: 31552961 DOI: 10.1039/c9cp04559g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Electron acceptors built upon the para-benzoquinone (pBQ) electrophore are ubiquitous in nature. Here, we present a frequency-resolved photoelectron spectroscopic study of the cold pBQ radical anion, pBQ-, solvated by a single water molecule, as commonly encountered in nature. Our results show that the electron accepting ability is enhanced by the single water molecule and by elevated temperatures.
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9
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da Costa RF, Ruivo JC, Kossoski F, Varella MTDN, Bettega MHF, Jones DB, Brunger MJ, Lima MAP. An ab initio investigation for elastic and electronically inelastic electron scattering from para-benzoquinone. J Chem Phys 2018; 149:174308. [DOI: 10.1063/1.5050622] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- R. F. da Costa
- Centro de Ciências Exatas, Departamento de Física, Universidade Federal do Espírito Santo, 29075-910 Vitória, Espírito Santo, Brazil
- Instituto de Física “Gleb Wataghin”, Universidade Estadual de Campinas, 13083-859 Campinas, São Paulo, Brazil
| | - J. C. Ruivo
- Instituto de Física, Universidade de São Paulo, Rua do Matão 1731, 05508-090 São Paulo, Brazil
| | - F. Kossoski
- Instituto de Física “Gleb Wataghin”, Universidade Estadual de Campinas, 13083-859 Campinas, São Paulo, Brazil
| | - M. T. do N. Varella
- Instituto de Física, Universidade de São Paulo, Rua do Matão 1731, 05508-090 São Paulo, Brazil
| | - M. H. F. Bettega
- Departamento de Física, Universidade Federal do Paraná, CP 19044, 81531-990 Curitiba, Paraná, Brazil
| | - D. B. Jones
- College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - M. J. Brunger
- College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - M. A. P. Lima
- Instituto de Física “Gleb Wataghin”, Universidade Estadual de Campinas, 13083-859 Campinas, São Paulo, Brazil
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10
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Bull JN, Carrascosa E, Giacomozzi L, Bieske EJ, Stockett MH. Ion mobility action spectroscopy of flavin dianions reveals deprotomer-dependent photochemistry. Phys Chem Chem Phys 2018; 20:19672-19681. [PMID: 30014081 PMCID: PMC6063075 DOI: 10.1039/c8cp03244k] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Photo-induced proton transfer, deprotomer-dependent photochemistry, and intramolecular charge transfer in flavin anions are investigated using action spectroscopy.
The intrinsic optical properties and photochemistry of flavin adenine dinucleotide (FAD) dianions are investigated using a combination of tandem ion mobility spectrometry and action spectroscopy. Two principal isomers are observed, the more stable form being deprotonated on the isoalloxazine group and a phosphate (N-3,PO4 deprotomer), and the other on the two phosphates (PO4,PO4 deprotomer). Ion mobility data and electronic action spectra suggest that photo-induced proton transfer occurs from the isoalloxazine group to a phosphate group, converting the PO4,PO4 deprotomer to the N-3,PO4 deprotomer. Comparisons of the isomer selective action spectra of FAD dianions and flavin monoanions with solution spectra and gas-phase photodissociation action spectra suggests that solvation shifts the electronic absorption of the deprotonated isoalloxazine group to higher energy. This is interpreted as evidence for significant charge transfer in the lowest optical transition of deprotonated isoalloxazine. Overall, this work demonstrates that the site of deprotonation of flavin anions strongly affects their electronic absorptions and photochemistry.
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Affiliation(s)
- James N Bull
- School of Chemistry, University of Melbourne, Melbourne, VIC 3010, Australia
| | - Eduardo Carrascosa
- School of Chemistry, University of Melbourne, Melbourne, VIC 3010, Australia
| | | | - Evan J Bieske
- School of Chemistry, University of Melbourne, Melbourne, VIC 3010, Australia
| | - Mark H Stockett
- School of Chemistry, University of Melbourne, Melbourne, VIC 3010, Australia and Department of Physics, Stockholm University, Stockholm, Sweden.
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11
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Stockett MH. Photo-induced proton-coupled electron transfer and dissociation of isolated flavin adenine dinucleotide mono-anions. Phys Chem Chem Phys 2018; 19:25829-25833. [PMID: 28745349 DOI: 10.1039/c7cp04068g] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The intrinsic optical absorption spectrum and photo-dissociation pathways of flavin adenine dinucleotide (FAD) mono-anions isolated in vacuo are probed using photo-induced dissociation (PID) action spectroscopy. The main photo-products are lumichrome and formylmethylflavin. Evidence is presented that the dissociation pathway leading to these products is non-statistical i.e. occurs during the excited state lifetime. This suggests that the stacking of the adenine and alloxazine chromophores, which enables ultra-fast quenching of the flavin excited state by photo-induced electron transfer in aqueous solution, is inhibited in vacuo. These results provide firm experimental confirmation that lumichrome formation from flavins proceeds via photo-induced, intra-molecular proton-coupled electron transfer.
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Affiliation(s)
- Mark H Stockett
- Stockholm University Department of Physics, Stockholm, Sweden.
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12
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Stockett MH, Boesen M, Houmøller J, Brøndsted Nielsen S. Accessing the Intrinsic Nature of Electronic Transitions from Gas‐Phase Spectroscopy of Molecular Ion/Zwitterion Complexes. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611320] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
| | - Mikkel Boesen
- Department of Physics and Astronomy Aarhus University Denmark
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13
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Stockett MH, Boesen M, Houmøller J, Brøndsted Nielsen S. Accessing the Intrinsic Nature of Electronic Transitions from Gas‐Phase Spectroscopy of Molecular Ion/Zwitterion Complexes. Angew Chem Int Ed Engl 2017; 56:3490-3495. [DOI: 10.1002/anie.201611320] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Indexed: 11/07/2022]
Affiliation(s)
| | - Mikkel Boesen
- Department of Physics and Astronomy Aarhus University Denmark
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14
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Loupas A, Gorfinkiel JD. Resonances in low-energy electron scattering from para-benzoquinone. Phys Chem Chem Phys 2017; 19:18252-18261. [DOI: 10.1039/c7cp02916k] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Shape and core-excited resonances ofpara-benzoquinone identified and characterized in electron scatteringR-matrix calculations.
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Affiliation(s)
- Alexandra Loupas
- School of Physical Sciences
- The Open University
- Milton Keynes
- UK
- Departamento de Física, Faculdade de Ciências e Tecnologia
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15
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Stockett MH, Houmøller J, Brøndsted Nielsen S. Nile blue shows its true colors in gas-phase absorption and luminescence ion spectroscopy. J Chem Phys 2016; 145:104303. [DOI: 10.1063/1.4962364] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- M. H. Stockett
- Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark
| | - J. Houmøller
- Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark
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16
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Anstöter CS, Bull JN, Verlet JR. Ultrafast dynamics of temporary anions probed through the prism of photodetachment. INT REV PHYS CHEM 2016. [DOI: 10.1080/0144235x.2016.1203522] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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