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Gibbard JA, Castracane E, Krylov AI, Continetti RE. Photoelectron photofragment coincidence spectroscopy of aromatic carboxylates: benzoate and p-coumarate. Phys Chem Chem Phys 2021; 23:18414-18424. [PMID: 34612382 DOI: 10.1039/d1cp02972j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoelectron-photofragment coincidence spectroscopy was used to study the dissociation dynamics of the conjugate bases of benzoic acid and p-coumaric acid. Upon photodetachment at 266 nm (4.66 eV) both aromatic carboxylates undergo decarboxylation, as well as the formation of stable carboxyl radicals. The key energetics are computed using high-level electronic structure methods. The dissociation dynamics of benzoate were dominated by a two-body DPD channel resulting in CO2 + C6H5 + e-, with a very small amount of stable C6H5CO2 showing that the radical ground state is stable and the excited states are dissociative. For p-coumarate (p-CA-) the dominant channel is photodetachment resulting in a stable radical and a photoelectron with electron kinetic energy (eKE) <2 eV. We also observed a minor two-body dissociative photodetachment (DPD) channel resulting in CO2 + HOC6H4CHCH + e-, characterized by eKE <0.8 eV. Evidence was also found for a three-body ionic photodissociation channel producing HOC6H5 + HCC- + CO2. The ion beam contained both the phenolate and carboxylate isomers of p-CA-, but DPD only occurred from the carboxylate form. For both species DPD is seen from the first and second excited states of the radical, where vibrational excitation is required for decarboxylation from the first excited radical state.
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Affiliation(s)
- J A Gibbard
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Dr, La Jolla, CA 92093-0340, USA.
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Kjellsson L, Nanda KD, Rubensson JE, Doumy G, Southworth SH, Ho PJ, March AM, Al Haddad A, Kumagai Y, Tu MF, Schaller RD, Debnath T, Bin Mohd Yusof MS, Arnold C, Schlotter WF, Moeller S, Coslovich G, Koralek JD, Minitti MP, Vidal ML, Simon M, Santra R, Loh ZH, Coriani S, Krylov AI, Young L. Resonant Inelastic X-Ray Scattering Reveals Hidden Local Transitions of the Aqueous OH Radical. Phys Rev Lett 2020; 124:236001. [PMID: 32603165 DOI: 10.1103/physrevlett.124.236001] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Revised: 05/01/2020] [Accepted: 05/22/2020] [Indexed: 05/06/2023]
Abstract
Resonant inelastic x-ray scattering (RIXS) provides remarkable opportunities to interrogate ultrafast dynamics in liquids. Here we use RIXS to study the fundamentally and practically important hydroxyl radical in liquid water, OH(aq). Impulsive ionization of pure liquid water produced a short-lived population of OH(aq), which was probed using femtosecond x-rays from an x-ray free-electron laser. We find that RIXS reveals localized electronic transitions that are masked in the ultraviolet absorption spectrum by strong charge-transfer transitions-thus providing a means to investigate the evolving electronic structure and reactivity of the hydroxyl radical in aqueous and heterogeneous environments. First-principles calculations provide interpretation of the main spectral features.
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Affiliation(s)
- L Kjellsson
- Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
| | - K D Nanda
- Department of Chemistry, University of Southern California, Los Angeles, California 90007, USA
| | - J-E Rubensson
- Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
| | - G Doumy
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - S H Southworth
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - P J Ho
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - A M March
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - A Al Haddad
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Y Kumagai
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - M-F Tu
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - R D Schaller
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, USA
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA
| | - T Debnath
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 639798
| | - M S Bin Mohd Yusof
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 639798
| | - C Arnold
- Center for Free-Electron Laser Science, DESY, 22607 Hamburg, Germany
- Department of Physics, Universität Hamburg, 20146 Hamburg, Germany
- Hamburg Centre for Ultrafast Imaging, 22607 Hamburg, Germany
| | - W F Schlotter
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - S Moeller
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - G Coslovich
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - J D Koralek
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - M P Minitti
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - M L Vidal
- DTU Chemistry-Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
| | - M Simon
- Sorbonne Université and CNRS, Laboratoire de Chimie Physique-Matière et Rayonnement, 75252 Paris Cedex 05, France
| | - R Santra
- Center for Free-Electron Laser Science, DESY, 22607 Hamburg, Germany
- Department of Physics, Universität Hamburg, 20146 Hamburg, Germany
- Hamburg Centre for Ultrafast Imaging, 22607 Hamburg, Germany
| | - Z-H Loh
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 639798
| | - S Coriani
- DTU Chemistry-Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
| | - A I Krylov
- Department of Chemistry, University of Southern California, Los Angeles, California 90007, USA
| | - L Young
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
- Department of Physics and James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA
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Loh ZH, Doumy G, Arnold C, Kjellsson L, Southworth SH, Al Haddad A, Kumagai Y, Tu MF, Ho PJ, March AM, Schaller RD, Bin Mohd Yusof MS, Debnath T, Simon M, Welsch R, Inhester L, Khalili K, Nanda K, Krylov AI, Moeller S, Coslovich G, Koralek J, Minitti MP, Schlotter WF, Rubensson JE, Santra R, Young L. Observation of the fastest chemical processes in the radiolysis of water. Science 2020; 367:179-182. [DOI: 10.1126/science.aaz4740] [Citation(s) in RCA: 84] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Accepted: 11/15/2019] [Indexed: 01/01/2023]
Abstract
Elementary processes associated with ionization of liquid water provide a framework for understanding radiation-matter interactions in chemistry and biology. Although numerous studies have been conducted on the dynamics of the hydrated electron, its partner arising from ionization of liquid water, H2O+, remains elusive. We used tunable femtosecond soft x-ray pulses from an x-ray free electron laser to reveal the dynamics of the valence hole created by strong-field ionization and to track the primary proton transfer reaction giving rise to the formation of OH. The isolated resonance associated with the valence hole (H2O+/OH) enabled straightforward detection. Molecular dynamics simulations revealed that the x-ray spectra are sensitive to structural dynamics at the ionization site. We found signatures of hydrated-electron dynamics in the x-ray spectrum.
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Affiliation(s)
- Z.-H. Loh
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
| | - G. Doumy
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA
| | - C. Arnold
- Center for Free-Electron Laser Science, DESY, Hamburg, Germany
- Department of Physics, Universität Hamburg, Hamburg, Germany
- Hamburg Centre for Ultrafast Imaging, Hamburg, Germany
| | - L. Kjellsson
- Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden
- European XFEL GmbH, Schenefeld, Germany
| | - S. H. Southworth
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA
| | - A. Al Haddad
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA
| | - Y. Kumagai
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA
| | - M.-F. Tu
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA
| | - P. J. Ho
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA
| | - A. M. March
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA
| | - R. D. Schaller
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, USA
- Department of Chemistry, Northwestern University, Evanston, IL, USA
| | - M. S. Bin Mohd Yusof
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
| | - T. Debnath
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
| | - M. Simon
- Sorbonne Université and CNRS, Laboratoire de Chemie Physique-Matière et Rayonnement, LCPMR, F-750005 Paris, France
| | - R. Welsch
- Center for Free-Electron Laser Science, DESY, Hamburg, Germany
- Hamburg Centre for Ultrafast Imaging, Hamburg, Germany
| | - L. Inhester
- Center for Free-Electron Laser Science, DESY, Hamburg, Germany
| | - K. Khalili
- Department of Energy Conversion and Storage, Technical University of Denmark, Roskilde, Denmark
| | - K. Nanda
- Department of Chemistry, University of Southern California, Los Angeles, CA, USA
| | - A. I. Krylov
- Center for Free-Electron Laser Science, DESY, Hamburg, Germany
- Department of Chemistry, University of Southern California, Los Angeles, CA, USA
| | - S. Moeller
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - G. Coslovich
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - J. Koralek
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - M. P. Minitti
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - W. F. Schlotter
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - J.-E. Rubensson
- Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden
| | - R. Santra
- Center for Free-Electron Laser Science, DESY, Hamburg, Germany
- Department of Physics, Universität Hamburg, Hamburg, Germany
- Hamburg Centre for Ultrafast Imaging, Hamburg, Germany
| | - L. Young
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA
- Department of Physics and James Franck Institute, University of Chicago, Chicago, IL, USA
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Smirnov VV, Goldberg MA, Krylov AI, Smirnov SV, Antonova OS, Tyut’kova YB, Konovalov AA, Podzorova LI, Barinov SM. Composite Materials in the Zirconia–Tricalcium Phosphate System for Bone Implants. Dokl Chem 2018. [DOI: 10.1134/s0012500818110046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Abstract
The report of an anomalously intense He4+ peak in electron impact mass spectra of large helium droplets created a stir 3 decades ago that continues to this day. When the electron kinetic energy exceeds 41 eV, an additional pathway opens that yields He4+ predominantly in an electronically excited metastable state. A pair of He*(23 S) atoms has been implicated based on the isolated He* energy of 19.82 eV and the 41 eV threshold, and the creation of He4+ has been conjectured to proceed via a pair of He2*( a3Σ u+) precursors. The mechanism whereby He* converts to He2* in liquid helium has remained a mystery, however. High level ab initio theory combined with classical molecular dynamics has been applied to systems comprising small numbers of He atoms. The conversion of He* to He2* in such systems is shown to be due to a simple many-body effect that yields He2* rapidly and efficiently.
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Affiliation(s)
- P Nijjar
- Department of Chemistry , University of Southern California , 3620 McClintock Avenue , Los Angeles , California 90089-1062 , United States
| | - A I Krylov
- Department of Chemistry , University of Southern California , 3620 McClintock Avenue , Los Angeles , California 90089-1062 , United States
| | - O V Prezhdo
- Department of Chemistry , University of Southern California , 3620 McClintock Avenue , Los Angeles , California 90089-1062 , United States
| | - A F Vilesov
- Department of Chemistry , University of Southern California , 3620 McClintock Avenue , Los Angeles , California 90089-1062 , United States
| | - C Wittig
- Department of Chemistry , University of Southern California , 3620 McClintock Avenue , Los Angeles , California 90089-1062 , United States
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Smirnov VV, Smirnov SV, Krylov AI, Antonova OS, Goldberg MA, Obolkina TO, Konovalov AA, Leonov AV, Barinov SM. Influence of Lithium on the Structure and Phase Composition Formation in the Synthesis of Hydroxyapatite. Dokl Chem 2018. [DOI: 10.1134/s0012500818080025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Smirnov VV, Krylov AI, Smirnov SV, Goldberg MA, Antonova OS, Shvorneva LI, Lysenkov AS, Titov DD, Baikin AS, Egorov AA, Barinov SM. Strengthening of composite materials of the fluorohydroxyapatite–zirconia system by titanium nitride. Dokl Chem 2016. [DOI: 10.1134/s0012500816110070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Kamarchik E, Rodrigo C, Bowman JM, Reisler H, Krylov AI. Overtone-induced dissociation and isomerization dynamics of the hydroxymethyl radical (CH2OH and CD2OH). I. A theoretical study. J Chem Phys 2012; 136:084304. [DOI: 10.1063/1.3685891] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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9
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Polyakov IV, Grigorenko BL, Epifanovsky EM, Krylov AI, Nemukhin AV. Potential Energy Landscape of the Electronic States of the GFP Chromophore in Different Protonation Forms: Electronic Transition Energies and Conical Intersections. J Chem Theory Comput 2010; 6:2377-87. [PMID: 26613493 DOI: 10.1021/ct100227k] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present the results of quantum chemical calculations of the transition energies and conical intersection points for the two lowest singlet electronic states of the green fluorescent protein chromophore, 4'-hydroxybenzylidene-2,3-dimethylimidazolinone, in the vicinity of its cis conformation in the gas phase. Four protonation states of the chromophore, i.e., anionic, neutral, cationic, and zwitterionic, were considered. Energy differences were computed by the perturbatively corrected complete active space self-consistent field (CASSCF)-based approaches at the corresponding potential energy minima optimized by density functional theory and CASSCF (for the ground and excited states, respectively). We also report the EOM-CCSD and SOS-CIS(D) results for the excitation energies. The minimum energy S0/S1 conical intersection points were located using analytic state-specific CASSCF gradients. The results reproduce essential features of previous ab initio calculations of the anionic form of the chromophore and provide an extension for the neutral, cationic, and zwitterionic forms, which are important in the protein environment. The S1 PES of the anion is fairly flat, and the barrier separating the planar bright conformation from the dark twisted one as well as the conical intersection point with the S0 surface is very small (less than 2 kcal/mol). On the cationic surface, the barrier is considerably higher (∼13 kcal/mol). The PES of the S1 state of the zwitterionic form does not have a planar minimum in the Franck-Condon region. The S1 surface of the neutral form possesses a bright planar minimum; the energy barrier of about 9 kcal/mol separates it from the dark twisted conformation as well as from the conical intersection point leading to the cis-trans chromophore isomerization.
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Affiliation(s)
- I V Polyakov
- Department of Chemistry, M.V. Lomonosov Moscow State University, Moscow 119991, Russian Federation, Department of Chemistry, University of Southern California, Los Angeles, California 90089, and Institute of Biochemical Physics, Russian Academy of Sciences, Moscow 119334, Russian Federation
| | - B L Grigorenko
- Department of Chemistry, M.V. Lomonosov Moscow State University, Moscow 119991, Russian Federation, Department of Chemistry, University of Southern California, Los Angeles, California 90089, and Institute of Biochemical Physics, Russian Academy of Sciences, Moscow 119334, Russian Federation
| | - E M Epifanovsky
- Department of Chemistry, M.V. Lomonosov Moscow State University, Moscow 119991, Russian Federation, Department of Chemistry, University of Southern California, Los Angeles, California 90089, and Institute of Biochemical Physics, Russian Academy of Sciences, Moscow 119334, Russian Federation
| | - A I Krylov
- Department of Chemistry, M.V. Lomonosov Moscow State University, Moscow 119991, Russian Federation, Department of Chemistry, University of Southern California, Los Angeles, California 90089, and Institute of Biochemical Physics, Russian Academy of Sciences, Moscow 119334, Russian Federation
| | - A V Nemukhin
- Department of Chemistry, M.V. Lomonosov Moscow State University, Moscow 119991, Russian Federation, Department of Chemistry, University of Southern California, Los Angeles, California 90089, and Institute of Biochemical Physics, Russian Academy of Sciences, Moscow 119334, Russian Federation
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Khrenova MG, Nemukhin AV, Grigorenko BL, Krylov AI, Domratcheva TM. Quantum Chemistry Calculations Provide Support to the Mechanism of the Light-Induced Structural Changes in the Flavin-Binding Photoreceptor Proteins. J Chem Theory Comput 2010; 6:2293-302. [DOI: 10.1021/ct100179p] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- M. G. Khrenova
- Chemistry Department, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow, 119991, Russian Federation, N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygina 4, Moscow, 119334, Russian Federation, Department of Chemistry, University of Southern California, Los Angeles, California 90089, and Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, 69120 Heidelberg, Germany
| | - A. V. Nemukhin
- Chemistry Department, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow, 119991, Russian Federation, N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygina 4, Moscow, 119334, Russian Federation, Department of Chemistry, University of Southern California, Los Angeles, California 90089, and Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, 69120 Heidelberg, Germany
| | - B. L. Grigorenko
- Chemistry Department, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow, 119991, Russian Federation, N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygina 4, Moscow, 119334, Russian Federation, Department of Chemistry, University of Southern California, Los Angeles, California 90089, and Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, 69120 Heidelberg, Germany
| | - A. I. Krylov
- Chemistry Department, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow, 119991, Russian Federation, N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygina 4, Moscow, 119334, Russian Federation, Department of Chemistry, University of Southern California, Los Angeles, California 90089, and Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, 69120 Heidelberg, Germany
| | - T. M. Domratcheva
- Chemistry Department, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow, 119991, Russian Federation, N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygina 4, Moscow, 119334, Russian Federation, Department of Chemistry, University of Southern California, Los Angeles, California 90089, and Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, 69120 Heidelberg, Germany
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Epifanovsky E, Polyakov I, Grigorenko B, Nemukhin A, Krylov AI. The effect of oxidation on the electronic structure of the green fluorescent protein chromophore. J Chem Phys 2010; 132:115104. [PMID: 20331319 DOI: 10.1063/1.3336425] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Electronic structure calculations of the singly and doubly ionized states of deprotonated 4(')-hydroxybenzylidene-2,3-dimethylimidazolinone (HBDI anion) are presented. One-electron oxidation produces a doublet radical that has blueshifted absorption, whereas the detachment of two electrons yields a closed-shell cation with strongly redshifted (by about 0.6 eV) absorption relative to the HBDI anion. The results suggest that the doubly oxidized species may be responsible for oxidative redding of green fluorescent protein. The proposed mechanism involves two-step oxidation via electronically excited states and is consistent with the available experimental information [A. M. Bogdanov, A. S. Mishin, I. V. Yampolsky, et al., Nat. Chem. Biol. 5, 459 (2009)]. The spectroscopic signatures of the ionization-induced structural changes in the chromophore are also discussed.
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Affiliation(s)
- E Epifanovsky
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA.
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Karpichev B, Koziol L, Diri K, Reisler H, Krylov AI. Electronically excited and ionized states of the CH2CH2OH radical: A theoretical study. J Chem Phys 2010; 132:114308. [DOI: 10.1063/1.3354975] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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13
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Gessner O, Lee AMD, Shaffer JP, Reisler H, Levchenko SV, Krylov AI, Underwood JG, Shi H, East ALL, Wardlaw DM, Chrysostom ETH, Hayden CC, Stolow A. Femtosecond Multidimensional Imaging of a Molecular Dissociation. Science 2006; 311:219-22. [PMID: 16357226 DOI: 10.1126/science.1120779] [Citation(s) in RCA: 149] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The coupled electronic and vibrational motions governing chemical processes are best viewed from the molecule's point of view-the molecular frame. Measurements made in the laboratory frame often conceal information because of the random orientations the molecule can take. We used a combination of time-resolved photoelectron spectroscopy, multidimensional coincidence imaging spectroscopy, and ab initio computation to trace a complete reactant-to-product pathway-the photodissociation of the nitric oxide dimer-from the molecule's point of view, on the femtosecond time scale. This method revealed an elusive photochemical process involving intermediate electronic configurations.
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Affiliation(s)
- O Gessner
- Steacie Institute for Molecular Sciences, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
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Krylov AI, Gerber RB, Gaveau MA, Mestdagh JM, Schilling B, Visticot JP. Spectroscopy, polarization and nonadiabatic dynamics of electronically excited Ba(Ar)n clusters: Theory and experiment. J Chem Phys 1996. [DOI: 10.1063/1.471021] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Krylov AI, Gerber RB. Photodissociation of ICN in solid and in liquid Ar: Dynamics of the cage effect and of excited‐state isomerization. J Chem Phys 1994. [DOI: 10.1063/1.466306] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Abstract
A gas chromatographic method for the determination of 1- and 3-methylhistidine in biological fluids was developed. The amino acid fraction containing 1- and 3-methylhistidine was isolated using ion-exchange chromatography. The amino acids were derivatized to N-trifluoroacetyl-O-isobutyl esters and analysed by gas chromatography with micropacked or capillary columns and an ionization-resonance detector. The conditions for the acylation of the histidines were studied and analyses of various derivatives such as N-trifluoroacetates, N-pentafluoropropionates and N-heptafluorobutyrates were tested. The detection limit of 1- and 3-methylhistidine was 50 ng per sample.
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Affiliation(s)
- V A Rogoskin
- Scientific Research Institute of Physical Culture, Leningrad, U.S.S.R
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Krylov AI, Kuklin VN, Ivin BA. Azines and azoles. 64. Mass spectra and tautomerism of 2-aryl-4,6-dioxo-1,3-thiazines. Chem Heterocycl Compd (N Y) 1987. [DOI: 10.1007/bf00476547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Rogozkin VA, Krylov AI, Meleshchenko LN, Alekseev AT. [Quantitative gas chromatographic determination of 3-methylhistidine in biological fluids]. Ukr Biokhim Zh (1978) 1986; 58:62-6. [PMID: 3739032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The gas chromatographic procedure is suggested to determine 3-methylhistidine in biological fluids. The amino acid fraction containing 3-methylhistidine is separated by ion-exchange chromatography. Amino acids are transformed into N-trifluoroacetyl-O-isobutyl esters which are analyzed by the gas chromatography instrument with micropacked columns and ionization-resonance detector. The limit of the quantitative determination of 3-methylhistidine is 50 ng per a probe.
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D'yachkov BA, Krylov AI, Kuznetsov VV, Semashko NN. Sodium target for a negative-ion injector. ATOM ENERGY+ 1980. [DOI: 10.1007/bf01121235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Gorokhov VV, Butylin RI, Krylov AI, Sergeev VP. [Metaldehyde against terrestrial molluscs]. Veterinariia 1976:64-5. [PMID: 133515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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