1
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Eronen EA, Vladyka A, Sahle CJ, Niskanen J. Structural descriptors and information extraction from X-ray emission spectra: aqueous sulfuric acid. Phys Chem Chem Phys 2024; 26:22752-22761. [PMID: 39162056 DOI: 10.1039/d4cp02454k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/21/2024]
Abstract
Machine learning can reveal new insights into X-ray spectroscopy of liquids when the local atomistic environment is presented to the model in a suitable way. Many unique structural descriptor families have been developed for this purpose. We benchmark the performance of six different descriptor families using a computational data set of 24 200 sulfur Kβ X-ray emission spectra of aqueous sulfuric acid simulated at six different concentrations. We train a feed-forward neural network to predict the spectra from the corresponding descriptor vectors and find that the local many-body tensor representation, smooth overlap of atomic positions and atom-centered symmetry functions excel in this comparison. We found a similar hierarchy when applying the emulator-based component analysis to identify and separate the spectrally relevant structural characteristics from the irrelevant ones. In this case, the spectra were dominantly dependent on the concentration of the system, whereas adding the second most significant degree of freedom in the decomposition allowed for distinction of the protonation state of the acid molecule.
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Affiliation(s)
- E A Eronen
- Department of Physics and Astronomy, University of Turku, FI-20014 Turun yliopisto, Finland.
| | - A Vladyka
- Department of Physics and Astronomy, University of Turku, FI-20014 Turun yliopisto, Finland.
| | - Ch J Sahle
- ESRF, The European Synchrotron, 71 Avenue des Martyrs, CS40220, 38043 Grenoble Cedex 9, France
| | - J Niskanen
- Department of Physics and Astronomy, University of Turku, FI-20014 Turun yliopisto, Finland.
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2
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Tomaník L, Pugini M, Mudryk K, Thürmer S, Stemer D, Credidio B, Trinter F, Winter B, Slavíček P. Liquid-jet photoemission spectroscopy as a structural tool: site-specific acid-base chemistry of vitamin C. Phys Chem Chem Phys 2024; 26:19673-19684. [PMID: 38963770 PMCID: PMC11267885 DOI: 10.1039/d4cp01521e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2024] [Accepted: 06/12/2024] [Indexed: 07/06/2024]
Abstract
Liquid-jet photoemission spectroscopy (LJ-PES) directly probes the electronic structure of solutes and solvents. It also emerges as a novel tool to explore chemical structure in aqueous solutions, yet the scope of the approach has to be examined. Here, we present a pH-dependent liquid-jet photoelectron spectroscopic investigation of ascorbic acid (vitamin C). We combine core-level photoelectron spectroscopy and ab initio calculations, allowing us to site-specifically explore the acid-base chemistry of the biomolecule. For the first time, we demonstrate the capability of the method to simultaneously assign two deprotonation sites within the molecule. We show that a large change in chemical shift appears even for atoms distant several bonds from the chemically modified group. Furthermore, we present a highly efficient and accurate computational protocol based on a single structure using the maximum-overlap method for modeling core-level photoelectron spectra in aqueous environments. This work poses a broader question: to what extent can LJ-PES complement established structural techniques such as nuclear magnetic resonance? Answering this question is highly relevant in view of the large number of incorrect molecular structures published.
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Affiliation(s)
- Lukáš Tomaník
- Department of Physical Chemistry, University of Chemistry and Technology, Technická 5, 16628 Prague, Czech Republic.
| | - Michele Pugini
- Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.
| | - Karen Mudryk
- Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.
| | - Stephan Thürmer
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-Ku, 606-8502 Kyoto, Japan
| | - Dominik Stemer
- Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.
| | - Bruno Credidio
- Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.
| | - Florian Trinter
- Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.
| | - Bernd Winter
- Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.
| | - Petr Slavíček
- Department of Physical Chemistry, University of Chemistry and Technology, Technická 5, 16628 Prague, Czech Republic.
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3
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Mudryk K, Lee C, Tomaník L, Malerz S, Trinter F, Hergenhahn U, Neumark DM, Slavíček P, Bradforth S, Winter B. How Does Mg 2+(aq) Interact with ATP (aq)? Biomolecular Structure through the Lens of Liquid-Jet Photoemission Spectroscopy. J Am Chem Soc 2024; 146:16062-16075. [PMID: 38802319 PMCID: PMC11177255 DOI: 10.1021/jacs.4c03174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 04/26/2024] [Accepted: 04/29/2024] [Indexed: 05/29/2024]
Abstract
Liquid-jet photoemission spectroscopy (LJ-PES) allows for a direct probing of electronic structure in aqueous solutions. We show the applicability of the approach to biomolecules in a complex environment, exploring site-specific information on the interaction of adenosine triphosphate in the aqueous phase (ATP(aq)) with magnesium (Mg2+(aq)), highlighting the synergy brought about by the simultaneous analysis of different regions in the photoelectron spectrum. In particular, we demonstrate intermolecular Coulombic decay (ICD) spectroscopy as a new and powerful addition to the arsenal of techniques for biomolecular structure investigation. We apply LJ-PES assisted by electronic-structure calculations to study ATP(aq) solutions with and without dissolved Mg2+. Valence photoelectron data reveal spectral changes in the phosphate and adenine features of ATP(aq) due to interactions with the divalent cation. Chemical shifts in Mg 2p, Mg 2s, P 2p, and P 2s core-level spectra as a function of the Mg2+/ATP concentration ratio are correlated to the formation of [Mg(ATP) 2]6-(aq), [MgATP]2-(aq), and [Mg2ATP](aq) complexes, demonstrating the element sensitivity of the technique to Mg2+-phosphate interactions. The most direct probe of the intermolecular interactions between ATP(aq) and Mg2+(aq) is delivered by the emerging ICD electrons following ionization of Mg 1s electrons. ICD spectra are shown to sensitively probe ligand exchange in the Mg2+-ATP(aq) coordination environment. In addition, we report and compare P 2s data from ATP(aq) and adenosine mono- and diphosphate (AMP(aq) and ADP(aq), respectively) solutions, probing the electronic structure of the phosphate chain and the local environment of individual phosphate units in ATP(aq). Our results provide a comprehensive view of the electronic structure of ATP(aq) and Mg2+-ATP(aq) complexes relevant to phosphorylation and dephosphorylation reactions that are central to bioenergetics in living organisms.
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Affiliation(s)
- Karen Mudryk
- Fritz-Haber-Institut
der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Chin Lee
- Fritz-Haber-Institut
der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Lukáš Tomaník
- Department
of Physical Chemistry, University of Chemistry
and Technology, Prague, Technická 5, Prague 6 16628, Czech Republic
| | - Sebastian Malerz
- Fritz-Haber-Institut
der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Florian Trinter
- Fritz-Haber-Institut
der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
- Institut
für Kernphysik, Goethe-Universität
Frankfurt, Max-von-Laue-Straße
1, 60438 Frankfurt
am Main, Germany
| | - Uwe Hergenhahn
- Fritz-Haber-Institut
der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Daniel M. Neumark
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Petr Slavíček
- Department
of Physical Chemistry, University of Chemistry
and Technology, Prague, Technická 5, Prague 6 16628, Czech Republic
| | - Stephen Bradforth
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Bernd Winter
- Fritz-Haber-Institut
der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
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4
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Zhang P, Gardini AT, Xu X, Parrinello M. Intramolecular and Water Mediated Tautomerism of Solvated Glycine. J Chem Inf Model 2024; 64:3599-3604. [PMID: 38620066 DOI: 10.1021/acs.jcim.4c00273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
Understanding tautomerism and characterizing solvent effects on the dynamic processes pose significant challenges. Using enhanced-sampling molecular dynamics based on state-of-the-art deep learning potentials, we investigated the tautomeric equilibria of glycine in water. We observed that the tautomerism between neutral and zwitterionic glycine can occur through both intramolecular and intermolecular proton transfers. The latter proceeds involving a contact anionic-glycine-hydronium ion pair or separate cationic-glycine-hydroxide ion pair. These pathways with comparable barriers contribute almost equally to the reaction flux.
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Affiliation(s)
- Pengchao Zhang
- Center for Combustion Energy, Department of Energy and Power Engineering, and Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
- Atomistic Simulations, Italian Institute of Technology, Genova 16152, Italy
| | - Axel Tosello Gardini
- Atomistic Simulations, Italian Institute of Technology, Genova 16152, Italy
- Department of Materials Science, Università di Milano-Bicocca, 20126 Milano, Italy
| | - Xuefei Xu
- Center for Combustion Energy, Department of Energy and Power Engineering, and Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
| | - Michele Parrinello
- Atomistic Simulations, Italian Institute of Technology, Genova 16152, Italy
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5
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Ponzi A, Rosa M, Kladnik G, Unger I, Ciavardini A, Di Nardi L, Viola E, Nicolas C, Došlić N, Goldoni A, Lanzilotto V. Inequivalent Solvation Effects on the N 1s Levels of Self-Associated Melamine Molecules in Aqueous Solution. J Phys Chem B 2023; 127:3016-3025. [PMID: 36972466 PMCID: PMC10084451 DOI: 10.1021/acs.jpcb.3c00327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Abstract
This work shows how the N 1s photoemission (PE) spectrum of self-associated melamine molecules in aqueous solution has been successfully rationalized using an integrated computational approach encompassing classical metadynamics simulations and quantum calculations based on density functional theory (DFT). The first approach allowed us to describe interacting melamine molecules in explicit waters and to identify dimeric configurations based on π-π and/or H-bonding interactions. Then, N 1s binding energies (BEs) and PE spectra were computed at the DFT level for all structures both in the gas phase and in an implicit solvent. While pure π-stacked dimers show gas-phase PE spectra almost identical to that of the monomer, those of the H-bonded dimers are sensibly affected by NH···NH or NH···NC interactions. Interestingly, the solvation suppresses all of the non-equivalences due to the H-bonds yielding similar PE spectra for all dimers, matching very well our measurements.
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Affiliation(s)
- Aurora Ponzi
- Division of Physical Chemistry, Ruđer Bošković Institute, 10000 Zagreb, Croatia
| | - Marta Rosa
- Department of Chemical Sciences, University of Padova, 35122 Padova, Italy
| | - Gregor Kladnik
- Department of Physics, University of Ljubljana, 1000 Ljubljana, Slovenia
- IOM-CNR, Laboratorio TASC, Basovizza SS-14, Km 163.5, 34149 Trieste, Italy
| | - Isaak Unger
- Department of Physics and Astronomy, Uppsala University, 751 20 Uppsala, Sweden
| | | | - Lorys Di Nardi
- Department of Chemistry, Sapienza University of Rome, 00185 Roma, Italy
| | - Elisa Viola
- Department of Chemistry, Sapienza University of Rome, 00185 Roma, Italy
| | | | - Nađa Došlić
- Division of Physical Chemistry, Ruđer Bošković Institute, 10000 Zagreb, Croatia
| | - Andrea Goldoni
- Elettra Synchrotron, Micro & Nano Carbon Laboratory, 34149 Trieste, Italy
| | - Valeria Lanzilotto
- IOM-CNR, Laboratorio TASC, Basovizza SS-14, Km 163.5, 34149 Trieste, Italy
- Department of Chemistry, Sapienza University of Rome, 00185 Roma, Italy
- Elettra Synchrotron, Micro & Nano Carbon Laboratory, 34149 Trieste, Italy
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6
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Vladyka A, Sahle CJ, Niskanen J. Towards structural reconstruction from X-ray spectra. Phys Chem Chem Phys 2023; 25:6707-6713. [PMID: 36804587 DOI: 10.1039/d2cp05420e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
We report a statistical analysis of Ge K-edge X-ray emission spectra simulated for amorphous GeO2 at elevated pressures. We find that employing machine learning approaches we can reliably predict the statistical moments of the Kβ'' and Kβ2 peaks in the spectrum from the Coulomb matrix descriptor with a training set of ∼ 104 samples. Spectral-significance-guided dimensionality reduction techniques allow us to construct an approximate inverse mapping from spectral moments to pseudo-Coulomb matrices. When applying this to the moments of the ensemble-mean spectrum, we obtain distances from the active site that match closely to those of the ensemble mean and which moreover reproduce the pressure-induced coordination change in amorphous GeO2. With this approach utilizing emulator-based component analysis, we are able to filter out the artificially complete structural information available from simulated snapshots, and quantitatively analyse structural changes that can be inferred from the changes in the Kβ emission spectrum alone.
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Affiliation(s)
- Anton Vladyka
- University of Turku, Department of Physics and Astronomy, 20014 Turun yliopisto, Finland.
| | - Christoph J Sahle
- European Synchrotron Radiation Source, 71 Avenue des Martyrs, 38000 Grenoble, France.
| | - Johannes Niskanen
- University of Turku, Department of Physics and Astronomy, 20014 Turun yliopisto, Finland.
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7
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Temperton RH, Kawde A, Eriksson A, Wang W, Kokkonen E, Jones R, Gericke SM, Zhu S, Quevedo W, Seidel R, Schnadt J, Shavorskiy A, Persson P, Uhlig J. Dip-and-pull ambient pressure photoelectron spectroscopy as a spectroelectrochemistry tool for probing molecular redox processes. J Chem Phys 2022; 157:244701. [PMID: 36586986 DOI: 10.1063/5.0130222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Ambient pressure x-ray photoelectron spectroscopy (APXPS) can provide a compelling platform for studying an analyte's oxidation and reduction reactions in solutions. This paper presents proof-of-principle operando measurements of a model organometallic complex, iron hexacyanide, in an aqueous solution using the dip-and-pull technique. The data demonstrates that the electrochemically active liquid meniscuses on the working electrodes can undergo controlled redox reactions which were observed using APXPS. A detailed discussion of several critical experimental considerations is included as guidance for anyone undertaking comparable experiments.
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Affiliation(s)
| | - Anurag Kawde
- Lund Institute of Advanced Neutron and X-ray Science, IDEON Building: Delta 5, Scheelevägen 19, 223 70 Lund, Sweden
| | - Axl Eriksson
- Division of Chemical Physics, Department of Chemistry, Lund University, Box 124, 221 00 Lund, Sweden
| | - Weijia Wang
- MAX IV Laboratory, Lund University, Box 118, 221 00 Lund, Sweden
| | - Esko Kokkonen
- MAX IV Laboratory, Lund University, Box 118, 221 00 Lund, Sweden
| | - Rosemary Jones
- Division of Synchrotron Radiation Research, Department of Physics, Lund University, Box 118, 22 100 Lund, Sweden
| | - Sabrina Maria Gericke
- Division of Combustion Physics, Faculty of Engineering, Lund University, Box 118, 22 100 Lund, Sweden
| | - Suyun Zhu
- MAX IV Laboratory, Lund University, Box 118, 221 00 Lund, Sweden
| | - Wilson Quevedo
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
| | - Robert Seidel
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
| | - Joachim Schnadt
- MAX IV Laboratory, Lund University, Box 118, 221 00 Lund, Sweden
| | | | - Petter Persson
- Lund Institute of Advanced Neutron and X-ray Science, IDEON Building: Delta 5, Scheelevägen 19, 223 70 Lund, Sweden
| | - Jens Uhlig
- Lund Institute of Advanced Neutron and X-ray Science, IDEON Building: Delta 5, Scheelevägen 19, 223 70 Lund, Sweden
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8
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Björneholm O, Öhrwall G, de Brito AN, Ågren H, Carravetta V. Superficial Tale of Two Functional Groups: On the Surface Propensity of Aqueous Carboxylic Acids, Alkyl Amines, and Amino Acids. Acc Chem Res 2022; 55:3285-3293. [PMID: 36472092 PMCID: PMC9730837 DOI: 10.1021/acs.accounts.2c00494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The gas-liquid interface of water is environmentally relevant due to the abundance of aqueous aerosol particles in the atmosphere. Aqueous aerosols often contain a significant fraction of organics. As aerosol particles are small, surface effects are substantial but not yet well understood. One starting point for studying the surface of aerosols is to investigate the surface of aqueous solutions. We review here studies of the surface composition of aqueous solutions using liquid-jet photoelectron spectroscopy in combination with theoretical simulations. Our focus is on model systems containing two functional groups, the carboxylic group and the amine group, which are both common in atmospheric organics. For alkanoic carboxylic acids and alkyl amines, we find that the surface propensity of such amphiphiles can be considered to be a balance between the hydrophilic interactions of the functional group and the hydrophobic interactions of the alkyl chain. For the same chain length, the neutral alkyl amine has a lower surface propensity than the neutral alkanoic carboxylic acid, whereas the surface propensity of the corresponding alkyl ammonium ion is higher than that of the alkanoic carboxylate ion. This different propensity leads to a pH-dependent surface composition which differs from the bulk, with the neutral forms having a much higher surface propensity than the charged ones. In aerosols, alkanoic carboxylic acids and alkyl amines are often found together. For such mixed systems, we find that the oppositely charged molecular ions form ion pairs at the surface. This cooperative behavior leads to a more organic-rich and hydrophobic surface than would be expected in a wide, environmentally relevant pH range. Amino acids contain a carboxylic and an amine group, and amino acids of biological origin are found in aerosols. Depending on the side group, we observe surface propensity ranging from surface-depleted to enriched by a factor of 10. Cysteine contains one more titratable group, which makes it exhibit more complex behavior, with some protonation states found only at the surface and not in the bulk. Moreover, the presence of molecular ions at the surface is seen to affect the distribution of inorganic ions. As the charge of the molecular ions changes with protonation, the effects on the inorganic ions also exhibit a pH dependence. Our results show that for these systems the surface composition differs from the bulk and changes with pH and that the results obtained for single-component solutions may be modified by ion-ion interactions in the case of mixed solutions.
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Affiliation(s)
- Olle Björneholm
- Division
of X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden,
| | - Gunnar Öhrwall
- MAX
IV Laboratory, Lund University, Box 118, SE-22100 Lund, Sweden
| | - Arnaldo Naves de Brito
- Department
of Applied Physics, Institute of Physics
“Gleb Wataghin”, Campinas University, CEP, 13083859 Campinas
SP, Brazil
| | - Hans Ågren
- Division
of X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden
| | - Vincenzo Carravetta
- CNR-IPCF, Institute
of Chemical Physical Processes, via G. Moruzzi 1, I-56124 Pisa, Italy
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9
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Renault JP, Huart L, Milosavljević AR, Bozek JD, Palaudoux J, Guigner JM, Marichal L, Leroy J, Wien F, Hervé Du Penhoat MA, Nicolas C. Electronic Structure and Solvation Effects from Core and Valence Photoelectron Spectroscopy of Serum Albumin. Int J Mol Sci 2022; 23:ijms23158227. [PMID: 35897833 PMCID: PMC9331649 DOI: 10.3390/ijms23158227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 07/20/2022] [Accepted: 07/21/2022] [Indexed: 12/07/2022] Open
Abstract
X-ray photoelectron spectroscopy of bovine serum albumin (BSA) in a liquid jet is used to investigate the electronic structure of a solvated protein, yielding insight into charge transfer mechanisms in biological systems in their natural environment. No structural damage was observed in BSA following X-ray photoelectron spectroscopy in a liquid jet sample environment. Carbon and nitrogen atoms in different chemical environments were resolved in the X-ray photoelectron spectra of both solid and solvated BSA. The calculations of charge distributions demonstrate the difficulty of assigning chemical contributions in complex systems in an aqueous environment. The high-resolution X-ray core electron spectra recorded are unchanged upon solvation. A comparison of the valence bands of BSA in both phases is also presented. These bands display a higher sensitivity to solvation effects. The ionization energy of the solvated BSA is determined at 5.7 ± 0.3 eV. Experimental results are compared with theoretical calculations to distinguish the contributions of various molecular components to the electronic structure. This comparison points towards the role of water in hole delocalization in proteins.
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Affiliation(s)
- Jean-Philippe Renault
- Université Paris-Saclay, CEA, CNRS, NIMBE, CEA Saclay, 91191 Gif-sur-Yvette, France; (L.H.); (L.M.); (J.L.)
- Correspondence: (J.-P.R.); (C.N.)
| | - Lucie Huart
- Université Paris-Saclay, CEA, CNRS, NIMBE, CEA Saclay, 91191 Gif-sur-Yvette, France; (L.H.); (L.M.); (J.L.)
- Synchrotron SOLEIL, 91192 Saint Aubin, France; (A.R.M.); (J.D.B.); (F.W.)
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Sorbonne Université, UMR CNRS 7590, MNHN, 75252 Paris, France; (J.-M.G.); (M.-A.H.D.P.)
| | | | - John D. Bozek
- Synchrotron SOLEIL, 91192 Saint Aubin, France; (A.R.M.); (J.D.B.); (F.W.)
| | - Jerôme Palaudoux
- Laboratoire de Chimie Physique-Matière et Rayonnement, Sorbonne Université, UMR CNRS 7614, 75252 Paris, France;
| | - Jean-Michel Guigner
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Sorbonne Université, UMR CNRS 7590, MNHN, 75252 Paris, France; (J.-M.G.); (M.-A.H.D.P.)
| | - Laurent Marichal
- Université Paris-Saclay, CEA, CNRS, NIMBE, CEA Saclay, 91191 Gif-sur-Yvette, France; (L.H.); (L.M.); (J.L.)
| | - Jocelyne Leroy
- Université Paris-Saclay, CEA, CNRS, NIMBE, CEA Saclay, 91191 Gif-sur-Yvette, France; (L.H.); (L.M.); (J.L.)
| | - Frank Wien
- Synchrotron SOLEIL, 91192 Saint Aubin, France; (A.R.M.); (J.D.B.); (F.W.)
| | - Marie-Anne Hervé Du Penhoat
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Sorbonne Université, UMR CNRS 7590, MNHN, 75252 Paris, France; (J.-M.G.); (M.-A.H.D.P.)
| | - Christophe Nicolas
- Synchrotron SOLEIL, 91192 Saint Aubin, France; (A.R.M.); (J.D.B.); (F.W.)
- Correspondence: (J.-P.R.); (C.N.)
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10
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Niskanen J, Vladyka A, Niemi J, Sahle C. Emulator-based decomposition for structural sensitivity of core-level spectra. ROYAL SOCIETY OPEN SCIENCE 2022; 9:220093. [PMID: 35706659 PMCID: PMC9174725 DOI: 10.1098/rsos.220093] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 05/09/2022] [Indexed: 05/03/2023]
Abstract
We explore the sensitivity of several core-level spectroscopic methods to the underlying atomistic structure by using the water molecule as our test system. We first define a metric that measures the magnitude of spectral change as a function of the structure, which allows for identifying structural regions with high spectral sensitivity. We then apply machine-learning-emulator-based decomposition of the structural parameter space for maximal explained spectral variance, first on overall spectral profile and then on chosen integrated regions of interest therein. The presented method recovers more spectral variance than partial least-squares fitting and the observed behaviour is well in line with the aforementioned metric for spectral sensitivity. The analysis method is able to independently identify spectroscopically dominant degrees of freedom, and to quantify their effect and significance.
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Affiliation(s)
- J. Niskanen
- Department of Physics and Astronomy, University of Turku, 20014 Turun yliopisto, Finland
| | - A. Vladyka
- Department of Physics and Astronomy, University of Turku, 20014 Turun yliopisto, Finland
| | - J. Niemi
- Department of Physics and Astronomy, University of Turku, 20014 Turun yliopisto, Finland
| | - C.J. Sahle
- European Synchrotron Radiation Source, 71 Avenue des Martyrs, 38000 Grenoble, France
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11
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Malerz S, Haak H, Trinter F, Stephansen AB, Kolbeck C, Pohl M, Hergenhahn U, Meijer G, Winter B. A setup for studies of photoelectron circular dichroism from chiral molecules in aqueous solution. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:015101. [PMID: 35104975 DOI: 10.1063/5.0072346] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 12/14/2021] [Indexed: 06/14/2023]
Abstract
We present a unique experimental design that enables the measurement of photoelectron circular dichroism (PECD) from chiral molecules in aqueous solution. The effect is revealed from the intensity difference of photoelectron emission into a backward-scattering angle relative to the photon propagation direction when ionizing with circularly polarized light of different helicity. This leads to asymmetries (normalized intensity differences) that depend on the handedness of the chiral sample and exceed the ones in conventional dichroic mechanisms by orders of magnitude. The asymmetry is largest for photon energies within several electron volts above the ionization threshold. A primary aim is to explore the effect of hydration on PECD. The modular and flexible design of our experimental setup EASI (Electronic structure from Aqueous Solutions and Interfaces) also allows for detection of more common photoelectron angular distributions, requiring distinctively different detection geometries and typically using linearly polarized light. A microjet is used for liquid-sample delivery. We describe EASI's technical features and present two selected experimental results, one based on synchrotron-light measurements and the other performed in the laboratory, using monochromatized He-II α radiation. The former demonstrates the principal effectiveness of PECD detection, illustrated for prototypic gas-phase fenchone. We also discuss the first data from liquid fenchone. In the second example, we present valence photoelectron spectra from liquid water and NaI aqueous solution, here obtained from a planar-surface microjet (flatjet). This new development features a more favorable symmetry for angle-dependent photoelectron measurements.
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Affiliation(s)
- Sebastian Malerz
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Henrik Haak
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Florian Trinter
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Anne B Stephansen
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Claudia Kolbeck
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Marvin Pohl
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Uwe Hergenhahn
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Gerard Meijer
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Bernd Winter
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
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12
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Malerz S, Mudryk K, Tomaník L, Stemer D, Hergenhahn U, Buttersack T, Trinter F, Seidel R, Quevedo W, Goy C, Wilkinson I, Thürmer S, Slavíček P, Winter B. Following in Emil Fischer's Footsteps: A Site-Selective Probe of Glucose Acid-Base Chemistry. J Phys Chem A 2021; 125:6881-6892. [PMID: 34328745 PMCID: PMC8381351 DOI: 10.1021/acs.jpca.1c04695] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 07/14/2021] [Indexed: 12/27/2022]
Abstract
Liquid-jet photoelectron spectroscopy was applied to determine the first acid dissociation constant (pKa) of aqueous-phase glucose while simultaneously identifying the spectroscopic signature of the respective deprotonation site. Valence spectra from solutions at pH values below and above the first pKa reveal a change in glucose's lowest ionization energy upon the deprotonation of neutral glucose and the subsequent emergence of its anionic counterpart. Site-specific insights into the solution-pH-dependent molecular structure changes are also shown to be accessible via C 1s photoelectron spectroscopy. The spectra reveal a considerably lower C 1s binding energy of the carbon site associated with the deprotonated hydroxyl group. The occurrence of photoelectron spectral fingerprints of cyclic and linear glucose prior to and upon deprotonation are also discussed. The experimental data are interpreted with the aid of electronic structure calculations. Our findings highlight the potential of liquid-jet photoelectron spectroscopy to act as a site-selective probe of the molecular structures that underpin the acid-base chemistry of polyprotic systems with relevance to environmental chemistry and biochemistry.
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Affiliation(s)
- Sebastian Malerz
- Fritz-Haber-Institut
der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Karen Mudryk
- Fritz-Haber-Institut
der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Lukáš Tomaník
- Department
of Physical Chemistry, University of Chemistry
and Technology, Technická 5, Prague 6 16628, Czech Republic
| | - Dominik Stemer
- Fritz-Haber-Institut
der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Uwe Hergenhahn
- Fritz-Haber-Institut
der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Tillmann Buttersack
- Fritz-Haber-Institut
der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Florian Trinter
- Fritz-Haber-Institut
der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
- Institut
für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - Robert Seidel
- Operando
Interfacial Photochemistry, Helmholtz-Zentrum
Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489 Berlin, Germany
- Institut
für Chemie, Humboldt-Universität
zu Berlin, Brook-Taylor-Str.
2, 12489 Berlin, Germany
| | - Wilson Quevedo
- Operando
Interfacial Photochemistry, Helmholtz-Zentrum
Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - Claudia Goy
- Centre for
Molecular Water Science (CMWS), Photon Science, Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607 Hamburg, Germany
| | - Iain Wilkinson
- Department
of Locally-Sensitive & Time-Resolved Spectroscopy, Helmholtz-Zentrum Berlin für Materialien und
Energie, Hahn-Meitner-Platz
1, 14109 Berlin, Germany
| | - Stephan Thürmer
- Department
of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-Ku, Kyoto 606-8502, Japan
| | - Petr Slavíček
- Department
of Physical Chemistry, University of Chemistry
and Technology, Technická 5, Prague 6 16628, Czech Republic
| | - Bernd Winter
- Fritz-Haber-Institut
der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
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13
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Thürmer S, Malerz S, Trinter F, Hergenhahn U, Lee C, Neumark DM, Meijer G, Winter B, Wilkinson I. Accurate vertical ionization energy and work function determinations of liquid water and aqueous solutions. Chem Sci 2021; 12:10558-10582. [PMID: 34447550 PMCID: PMC8356740 DOI: 10.1039/d1sc01908b] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Accepted: 07/02/2021] [Indexed: 01/29/2023] Open
Abstract
The absolute-scale electronic energetics of liquid water and aqueous solutions, both in the bulk and at associated interfaces, are the central determiners of water-based chemistry. However, such information is generally experimentally inaccessible. Here we demonstrate that a refined implementation of the liquid microjet photoelectron spectroscopy (PES) technique can be adopted to address this. Implementing concepts from condensed matter physics, we establish novel all-liquid-phase vacuum and equilibrated solution–metal-electrode Fermi level referencing procedures. This enables the precise and accurate determination of previously elusive water solvent and solute vertical ionization energies, VIEs. Notably, this includes quantification of solute-induced perturbations of water's electronic energetics and VIE definition on an absolute and universal chemical potential scale. Defining and applying these procedures over a broad range of ionization energies, we accurately and respectively determine the VIE and oxidative stability of liquid water as 11.33 ± 0.03 eV and 6.60 ± 0.08 eV with respect to its liquid-vacuum-interface potential and Fermi level. Combining our referencing schemes, we accurately determine the work function of liquid water as 4.73 ± 0.09 eV. Further, applying our novel approach to a pair of exemplary aqueous solutions, we extract absolute VIEs of aqueous iodide anions, reaffirm the robustness of liquid water's electronic structure to high bulk salt concentrations (2 M sodium iodide), and quantify reference-level dependent reductions of water's VIE and a 0.48 ± 0.13 eV contraction of the solution's work function upon partial hydration of a known surfactant (25 mM tetrabutylammonium iodide). Our combined experimental accomplishments mark a major advance in our ability to quantify electronic–structure interactions and chemical reactivity in liquid water, which now explicitly extends to the measurement of absolute-scale bulk and interfacial solution energetics, including those of relevance to aqueous electrochemical processes. A generalised liquid-phase photoelectron spectroscopy approach is reported, allowing accurate, absolute energy scale ionisation energies of liquid water and aqueous solutions, as well as liquid water's work function to be reported.![]()
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Affiliation(s)
- Stephan Thürmer
- Department of Chemistry, Graduate School of Science, Kyoto University Kitashirakawa-Oiwakecho, Sakyo-Ku Kyoto 606-8502 Japan
| | - Sebastian Malerz
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4-6 14195 Berlin Germany
| | - Florian Trinter
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4-6 14195 Berlin Germany .,Institut für Kernphysik, Goethe-Universität Max-von-Laue-Straße 1 60438 Frankfurt am Main Germany
| | - Uwe Hergenhahn
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4-6 14195 Berlin Germany
| | - Chin Lee
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4-6 14195 Berlin Germany .,Chemical Sciences Division, Lawrence Berkeley National Laboratory Berkeley CA 94720 USA.,Department of Chemistry, University of California Berkeley CA 94720 USA
| | - Daniel M Neumark
- Chemical Sciences Division, Lawrence Berkeley National Laboratory Berkeley CA 94720 USA.,Department of Chemistry, University of California Berkeley CA 94720 USA
| | - Gerard Meijer
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4-6 14195 Berlin Germany
| | - Bernd Winter
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4-6 14195 Berlin Germany
| | - Iain Wilkinson
- Department of Locally-Sensitive & Time-Resolved Spectroscopy, Helmholtz-Zentrum Berlin für Materialien und Energie Hahn-Meitner-Platz 1 14109 Berlin Germany
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14
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Mattioli G, Avaldi L, Bolognesi P, Bozek JD, Castrovilli MC, Chiarinelli J, Domaracka A, Indrajith S, Maclot S, Milosavljević AR, Nicolafrancesco C, Rousseau P. Water-biomolecule clusters studied by photoemission spectroscopy and multilevel atomistic simulations: hydration or solvation? Phys Chem Chem Phys 2021; 23:15049-15058. [PMID: 34231588 DOI: 10.1039/d1cp02031e] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The properties of mixed water-uracil nanoaggregates have been probed by core electron-photoemission measurements to investigate supramolecular assembly in the gas phase driven by weak interactions. The interpretation of the measurements has been assisted by multilevel atomistic simulations, based on semi-empirical tight-binding and DFT-based methods. Our protocol established a positive-feedback loop between experimental and computational techniques, which has enabled a sound and detailed atomistic description of such complex heterogeneous molecular aggregates. Among biomolecules, uracil offers interesting and generalized skeletal features; its structure encompasses an alternation of hydrophilic H-bond donor and acceptor sites and hydrophobic moieties, typical in biomolecular systems, that induces a supramolecular core-shell-like organization of the mixed clusters with a water core and an uracil shell. This structure is far from typical models of both solid-state hydration, with water molecules in defined positions, or liquid solvation, where disconnected uracil molecules are completely surrounded by water.
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Affiliation(s)
- Giuseppe Mattioli
- CNR-Istituto di Struttura della Materia, Area della Ricerca di Roma 1, CP 10, Monterotondo Scalo, Italy.
| | - Lorenzo Avaldi
- CNR-Istituto di Struttura della Materia, Area della Ricerca di Roma 1, CP 10, Monterotondo Scalo, Italy.
| | - Paola Bolognesi
- CNR-Istituto di Struttura della Materia, Area della Ricerca di Roma 1, CP 10, Monterotondo Scalo, Italy.
| | - John D Bozek
- Synchrotron SOLEIL, L'Orme de Merisiers, 91192, Saint Aubin, BP48, 1192, Gif-sur-Yvette Cedex, France
| | - Mattea C Castrovilli
- CNR-Istituto di Struttura della Materia, Area della Ricerca di Roma 1, CP 10, Monterotondo Scalo, Italy.
| | - Jacopo Chiarinelli
- CNR-Istituto di Struttura della Materia, Area della Ricerca di Roma 1, CP 10, Monterotondo Scalo, Italy.
| | - Alicja Domaracka
- Normandie Univ., ENSICAEN, UNICAEN, CEA, CNRS, CIMAP, 14000 Caen, France
| | | | - Sylvain Maclot
- Physics Department, University of Gothenburg, Origovägen 6B, 41296 Göteborg, Sweden
| | | | - Chiara Nicolafrancesco
- Synchrotron SOLEIL, L'Orme de Merisiers, 91192, Saint Aubin, BP48, 1192, Gif-sur-Yvette Cedex, France and Normandie Univ., ENSICAEN, UNICAEN, CEA, CNRS, CIMAP, 14000 Caen, France
| | - Patrick Rousseau
- Normandie Univ., ENSICAEN, UNICAEN, CEA, CNRS, CIMAP, 14000 Caen, France
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15
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Dupuy R, Richter C, Winter B, Meijer G, Schlögl R, Bluhm H. Core level photoelectron spectroscopy of heterogeneous reactions at liquid-vapor interfaces: Current status, challenges, and prospects. J Chem Phys 2021; 154:060901. [PMID: 33588531 DOI: 10.1063/5.0036178] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Liquid-vapor interfaces, particularly those between aqueous solutions and air, drive numerous important chemical and physical processes in the atmosphere and in the environment. X-ray photoelectron spectroscopy is an excellent method for the investigation of these interfaces due to its surface sensitivity, elemental and chemical specificity, and the possibility to obtain information on the depth distribution of solute and solvent species in the interfacial region. In this Perspective, we review the progress that was made in this field over the past decades and discuss the challenges that need to be overcome for investigations of heterogeneous reactions at liquid-vapor interfaces under close-to-realistic environmental conditions. We close with an outlook on where some of the most exciting and promising developments might lie in this field.
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Affiliation(s)
- Rémi Dupuy
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Clemens Richter
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Bernd Winter
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Gerard Meijer
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Robert Schlögl
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Hendrik Bluhm
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany
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16
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Kostko O, Xu B, Ahmed M. Local electronic structure of histidine in aqueous solution. Phys Chem Chem Phys 2021; 23:8847-8853. [DOI: 10.1039/d1cp00361e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
X-Ray spectroscopy coupled with DFT calculations reveals the pH dependent electronic structure of an amino acid in an aqueous environment.
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Affiliation(s)
- O. Kostko
- Chemical Sciences Division
- Lawrence Berkeley National Laboratory
- Berkeley
- USA
- Advanced Light Source
| | - B. Xu
- Chemical Sciences Division
- Lawrence Berkeley National Laboratory
- Berkeley
- USA
| | - M. Ahmed
- Chemical Sciences Division
- Lawrence Berkeley National Laboratory
- Berkeley
- USA
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17
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Silva JL, Unger I, Matias TA, Franco LR, Damas G, Costa LT, Toledo KCF, Rocha TCR, de Brito AN, Saak CM, Coutinho K, Araki K, Björneholm O, Brena B, Araujo CM. X-ray Photoelectron Fingerprints of High-Valence Ruthenium-Oxo Complexes along the Oxidation Reaction Pathway in an Aqueous Environment. J Phys Chem Lett 2019; 10:7636-7643. [PMID: 31747290 DOI: 10.1021/acs.jpclett.9b02756] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Recent advances in operando-synchrotron-based X-ray techniques are making it possible to address fundamental questions related to complex proton-coupled electron transfer reactions, for instance, the electrocatalytic water splitting process. However, it is still a grand challenge to assess the ability of the different techniques to characterize the relevant intermediates, with minimal interference on the reaction mechanism. To this end, we have developed a novel methodology employing X-ray photoelectron spectroscopy (XPS) in connection with the liquid-jet approach to probe the electrochemical properties of a model electrocatalyst, [RuII(bpy)2(py)(OH2)]2+, in an aqueous environment. There is a unique fingerprint of the extremely important higher-valence ruthenium-oxo species in the XPS spectra along the oxidation reaction pathway. Furthermore, a sequential method combining quantum mechanics and molecular mechanics is used to illuminate the underlying physical chemistry of such systems. This study provides the basis for the future development of in-operando XPS techniques for water oxidation reactions.
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Affiliation(s)
- Jose Luis Silva
- Materials Theory Division, Department of Physics and Astronomy , Uppsala University , Box 516, 75120 Uppsala , Sweden
| | - Isaak Unger
- Molecular and Condensed Matter Physics Division, Department of Physics and Astronomy , Uppsala University , Box 516, 75120 Uppsala , Sweden
| | - Tiago Araujo Matias
- Department of Fundamental Chemistry, Institute of Chemistry , University of São Paulo , Av. Lineu Prestes 748, Cidade Universitária, Butanta , Sao Paulo , SP 05508-000 , Brazil
| | - Leandro Rezende Franco
- Instituto de Física , Universidade de São Paulo , Cidade Universitária , 05508-090 São Paulo , SP , Brazil
| | - Giane Damas
- Materials Theory Division, Department of Physics and Astronomy , Uppsala University , Box 516, 75120 Uppsala , Sweden
| | - Luciano T Costa
- Instituto de Química, Departamento de Físico-química , Universidade Federal Fluminense , Outeiro de São João Batista s/n , CEP, 24020-150 Niterói , RJ , Brazil
| | - Kalil C F Toledo
- Department of Fundamental Chemistry, Institute of Chemistry , University of São Paulo , Av. Lineu Prestes 748, Cidade Universitária, Butanta , Sao Paulo , SP 05508-000 , Brazil
| | - Tulio C R Rocha
- Brazilian Synchrotron Light Laboratory (LNLS) , Brazilian Center for Research on Energy and Materials (CNPEM) , P.O. Box 6192, 13083-970 Campinas , SP , Brazil
| | - Arnaldo Naves de Brito
- Institute of Physics "Gleb Wataghin" , University of Campinas , 13083-859 Campinas , SP , Brazil
| | - Clara-Magdalena Saak
- Molecular and Condensed Matter Physics Division, Department of Physics and Astronomy , Uppsala University , Box 516, 75120 Uppsala , Sweden
| | - Kaline Coutinho
- Instituto de Física , Universidade de São Paulo , Cidade Universitária , 05508-090 São Paulo , SP , Brazil
| | - Koiti Araki
- Department of Fundamental Chemistry, Institute of Chemistry , University of São Paulo , Av. Lineu Prestes 748, Cidade Universitária, Butanta , Sao Paulo , SP 05508-000 , Brazil
| | - Olle Björneholm
- Molecular and Condensed Matter Physics Division, Department of Physics and Astronomy , Uppsala University , Box 516, 75120 Uppsala , Sweden
| | - Barbara Brena
- Materials Theory Division, Department of Physics and Astronomy , Uppsala University , Box 516, 75120 Uppsala , Sweden
| | - C Moyses Araujo
- Materials Theory Division, Department of Physics and Astronomy , Uppsala University , Box 516, 75120 Uppsala , Sweden
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18
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Barrozo A, Xu B, Gunina AO, Jacobs MI, Wilson K, Kostko O, Ahmed M, Krylov AI. To Be or Not To Be a Molecular Ion: The Role of the Solvent in Photoionization of Arginine. J Phys Chem Lett 2019; 10:1860-1865. [PMID: 30933520 DOI: 10.1021/acs.jpclett.9b00494] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Application of photoionization mass spectroscopy, a technique capable of assessing protonation states in complex molecules in the gas phase, is challenging for arginine due to its fragility. We report photoionization efficiencies in the valence region of aqueous aerosol particles produced from arginine solutions under various pH and vaporization conditions. By using ab initio calculations, we investigate the stability of different conformers. Our results show that neutral arginine fragments upon ionization in the gas phase but solvation stabilizes the molecular ion, resulting in different photoionization dynamics. We also report the valence-band photoelectron spectra of the aerosol solutions obtained at different pH values.
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Affiliation(s)
- Alexandre Barrozo
- Department of Chemistry , University of Southern California , Los Angeles , California 90089-0482 , United States
| | - Bo Xu
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Anastasia O Gunina
- Department of Chemistry , University of Southern California , Los Angeles , California 90089-0482 , United States
| | - Michael I Jacobs
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Kevin Wilson
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Oleg Kostko
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Musahid Ahmed
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Anna I Krylov
- Department of Chemistry , University of Southern California , Los Angeles , California 90089-0482 , United States
- The Hamburg Centre for Ultrafast Imaging , Luruper Chaussee 149 , 22671 Hamburg , Germany
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19
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Ko YJ, Choi K, Lee S, Jung KW, Hong S, Mizuseki H, Choi JW, Lee WS. Strong chromate-adsorbent based on pyrrolic nitrogen structure: An experimental and theoretical study on the adsorption mechanism. WATER RESEARCH 2018; 145:287-296. [PMID: 30165314 DOI: 10.1016/j.watres.2018.08.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Revised: 07/11/2018] [Accepted: 08/15/2018] [Indexed: 06/08/2023]
Abstract
Chromate is considered a toxic contaminant in various water sources because it poses a risk to animal and human health. To meet the stringent limits for chromium in water and wastewater, pyrrolic nitrogen structure was investigated as a chromate adsorbent for aqueous solutions, employing a polypyrrole coating on carbon black. The characteristics of the adsorbent were analyzed by high-resolution transmission electron microscopy, energy-filtered transmission electron microscopy, and X-ray photoelectron spectroscopy. Chromate was adsorbed as both Cr(III) and Cr(VI). The chromate adsorption capacity increased (from 50.84 to 174.81 mg/g) with increasing amounts of pyrrole monomers (from 50 to 86%) in the adsorbent. The adsorption capacity was well-correlated with the pyrrolic nitrogen content (from 2.06 to 6.57 at%) in the adsorbent, rather than other types of nitrogen. The optimized adsorption capacity (174.81 mg/g in the equilibrium batch experiment and 211.10 mg/g at an initial pH of 3) was far superior to those of conventional adsorbents. We investigated the mechanism behind this powerful chromate adsorption on pyrrolic nitrogen via physical/chemical analyses of the pH-dependent adsorption behavior, supported by first-principles calculation based on density functional theory. We found that Cr(III) and Cr(VI) adsorption followed different reaction paths. Cr(III) adsorption occurred in two sequential steps: 1) A Jones oxidation reaction (JOR)-like reaction of Cr(VI) with pyrrolic N that generates Cr(III), and 2) Cr(III) adsorption on the deprotonated pyrrolic N through Cr(III)-N covalent bonding. Cr(VI) adsorption followed an alternative path: hydrogen-bonding to the deprotonation-free pyrrolic N sites. The pH-dependent fractional deprotonation of the pyrrolic N sites by the JOR-like reaction in the presence of chromate played an important role in the adsorption.
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Affiliation(s)
- Young-Jin Ko
- Center for Electronic Materials, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Keunsu Choi
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Soonjae Lee
- Department of Earth and Environmental Sciences, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Kyung-Won Jung
- Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Seokwon Hong
- Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Hiroshi Mizuseki
- Computational Science Research Center, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea.
| | - Jae-Woo Choi
- Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea; Division of Energy & Environment Technology, KIST School, Korea University of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea.
| | - Wook-Seong Lee
- Center for Electronic Materials, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea.
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20
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Li H, Jiang J, Luo Y. Identification of the smallest peptide with a zwitterion as the global minimum: a first-principles study on arginine-containing peptides. Phys Chem Chem Phys 2018; 19:12117-12126. [PMID: 28443881 DOI: 10.1039/c7cp01380a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Zwitterions are believed to play an important role in determining the structures, properties and functions of peptides and proteins. However, the smallest peptide with a zwitterionic structure as the global minimum in the gas phase is still not yet identified. In this study, an effective step-by-step strategy has been used to characterize the stable conformers of arginine-containing peptides arginylalanine (ArgAla) and arginylserine (ArgSer). Energy calculations at the DSD-PBEP86-D3BJ/aug-cc-pVTZ level and further extrapolation to the complete basis set (CBS) limit have confirmed, for the first time, that ArgSer appears to be a promising candidate as the smallest peptide with a zwitterionic global minimum structure. First-principles simulations have been performed for near-edge X-ray absorption fine-structure (NEXAFS) spectra and X-ray photoelectron spectra (XPS) at C, N and O K-edges, as well as for infrared (IR) spectra of these arginine-containing peptides. Notable spectral differences were found which enable the unambiguous identification of different neutral forms in future experiments. Our study thus provides valuable insights into the structural stability of zwitterions with the increase of molecular size and illustrates the competition between the canonical and zwitterionic isomers.
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Affiliation(s)
- Hongbao Li
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230026, China.
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21
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Horikawa Y, Tokushima T, Takahashi O, Harada Y, Hiraya A, Shin S. Effect of amino group protonation on the carboxyl group in aqueous glycine observed by O 1s X-ray emission spectroscopy. Phys Chem Chem Phys 2018; 20:23214-23221. [DOI: 10.1039/c7cp08305j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The valence electronic structures of the amino acid glycine in aqueous solution were investigated in detail through X-ray emission spectroscopy at O 1s excitation under selective excitation conditions of the CO site in the carboxyl group.
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Affiliation(s)
| | | | - O. Takahashi
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima
- Japan
| | - Y. Harada
- Institute for Solid State Physics
- The University of Tokyo
- Kashiwa
- Japan
- Synchrotron Radiation Research Organization
| | - A. Hiraya
- Department of Physical Science
- Hiroshima University
- Higashi-Hiroshima
- Japan
| | - S. Shin
- Institute for Solid State Physics
- The University of Tokyo
- Kashiwa
- Japan
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22
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Kostko O, Xu B, Jacobs MI, Ahmed M. Soft X-ray spectroscopy of nanoparticles by velocity map imaging. J Chem Phys 2017; 147:013931. [DOI: 10.1063/1.4982822] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- O. Kostko
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - B. Xu
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - M. I. Jacobs
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
- Department of Chemistry, University of California, Berkeley, California 94720, USA
| | - M. Ahmed
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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23
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Sadybekov A, Krylov AI. Coupled-cluster based approach for core-level states in condensed phase: Theory and application to different protonated forms of aqueous glycine. J Chem Phys 2017; 147:014107. [DOI: 10.1063/1.4990564] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Affiliation(s)
- Arman Sadybekov
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA
| | - Anna I. Krylov
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA
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24
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Xu B, Jacobs MI, Kostko O, Ahmed M. Guanidinium Group Remains Protonated in a Strongly Basic Arginine Solution. Chemphyschem 2017; 18:1503-1506. [DOI: 10.1002/cphc.201700197] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Bo Xu
- Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| | - Michael I. Jacobs
- Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
- Department of Chemistry University of California Berkeley CA 94720 USA
| | - Oleg Kostko
- Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| | - Musahid Ahmed
- Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
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25
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Mocellin A, Gomes AHDA, Araújo OC, de Brito AN, Björneholm O. Surface Propensity of Atmospherically Relevant Amino Acids Studied by XPS. J Phys Chem B 2017; 121:4220-4225. [DOI: 10.1021/acs.jpcb.7b02174] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alexandra Mocellin
- Institute
of Physics, Brasilia University (UnB), Box 4455, Brasília 70910-970, Brazil
| | - Anderson Herbert de Abreu Gomes
- Institute
of Physics “Gleb Wataghin”, Department of Applied Physics, University of Campinas (Unicamp), Campinas 13083-859, Brazil
| | - Oscar Cardoso Araújo
- Institute
of Physics, Brasilia University (UnB), Box 4455, Brasília 70910-970, Brazil
| | - Arnaldo Naves de Brito
- Institute
of Physics “Gleb Wataghin”, Department of Applied Physics, University of Campinas (Unicamp), Campinas 13083-859, Brazil
| | - Olle Björneholm
- Department
of Physics and Astronomy, Uppsala University, 752 36 Uppsala, Sweden
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26
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Chang PC, Yu Y, Wu ZH, Lin PC, Chen WR, Su CC, Chen MS, Li YL, Huang TP, Lee YY, Wang CC. Molecular Basis of the Antioxidant Capability of Glutathione Unraveled via Aerosol VUV Photoelectron Spectroscopy. J Phys Chem B 2016; 120:10181-10191. [DOI: 10.1021/acs.jpcb.6b04631] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | | | | | | | | | | | - Tzu-Ping Huang
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan 30076, ROC
| | - Yin-Yu Lee
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan 30076, ROC
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27
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Plasser F, Ruckenbauer M, Mai S, Oppel M, Marquetand P, González L. Efficient and Flexible Computation of Many-Electron Wave Function Overlaps. J Chem Theory Comput 2016; 12:1207-19. [PMID: 26854874 PMCID: PMC4785508 DOI: 10.1021/acs.jctc.5b01148] [Citation(s) in RCA: 117] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Indexed: 11/29/2022]
Abstract
A new algorithm for the computation of the overlap between many-electron wave functions is described. This algorithm allows for the extensive use of recurring intermediates and thus provides high computational efficiency. Because of the general formalism employed, overlaps can be computed for varying wave function types, molecular orbitals, basis sets, and molecular geometries. This paves the way for efficiently computing nonadiabatic interaction terms for dynamics simulations. In addition, other application areas can be envisaged, such as the comparison of wave functions constructed at different levels of theory. Aside from explaining the algorithm and evaluating the performance, a detailed analysis of the numerical stability of wave function overlaps is carried out, and strategies for overcoming potential severe pitfalls due to displaced atoms and truncated wave functions are presented.
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Affiliation(s)
- Felix Plasser
- Institute for Theoretical
Chemistry, University of Vienna, Währinger Straße 17, 1090 Vienna, Austria
| | - Matthias Ruckenbauer
- Institute for Theoretical
Chemistry, University of Vienna, Währinger Straße 17, 1090 Vienna, Austria
| | - Sebastian Mai
- Institute for Theoretical
Chemistry, University of Vienna, Währinger Straße 17, 1090 Vienna, Austria
| | - Markus Oppel
- Institute for Theoretical
Chemistry, University of Vienna, Währinger Straße 17, 1090 Vienna, Austria
| | - Philipp Marquetand
- Institute for Theoretical
Chemistry, University of Vienna, Währinger Straße 17, 1090 Vienna, Austria
| | - Leticia González
- Institute for Theoretical
Chemistry, University of Vienna, Währinger Straße 17, 1090 Vienna, Austria
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28
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Walz MM, Werner J, Ekholm V, Prisle NL, Öhrwall G, Björneholm O. Alcohols at the aqueous surface: chain length and isomer effects. Phys Chem Chem Phys 2016; 18:6648-56. [DOI: 10.1039/c5cp06463e] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Alcohol isomers at the water–vapor interface were studied to determine free energies of adsorption, surface concentrations and enrichment factors.
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Affiliation(s)
- M.-M. Walz
- Uppsala University
- Department of Physics and Astronomy
- 75120 Uppsala
- Sweden
| | - J. Werner
- Uppsala University
- Department of Physics and Astronomy
- 75120 Uppsala
- Sweden
- Swedish University of Agricultural Sciences
| | - V. Ekholm
- Uppsala University
- Department of Physics and Astronomy
- 75120 Uppsala
- Sweden
| | - N. L. Prisle
- Department of Physics, Helsinki University
- Box 64
- 00014 Helsinki University
- Finland
| | - G. Öhrwall
- MAX IV Laboratory
- Lund University
- 22100 Lund
- Sweden
| | - O. Björneholm
- Uppsala University
- Department of Physics and Astronomy
- 75120 Uppsala
- Sweden
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29
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Olivieri G, Goel A, Kleibert A, Brown MA. Effect of X-ray spot size on liquid jet photoelectron spectroscopy. JOURNAL OF SYNCHROTRON RADIATION 2015; 22:1528-30. [PMID: 26524318 PMCID: PMC4787839 DOI: 10.1107/s1600577515016306] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 09/01/2015] [Indexed: 05/07/2023]
Abstract
A 30 µm pinhole is introduced in the intermediate focus of the SIM beamline at the Swiss Light Source to improve the spot size at the second downstream focus, which is used here for liquid jet X-ray photoelectron spectroscopy experiments. The 30 µm pinhole reduces the beam dimensions from 250 (v) × 100 (h) µm to 75 × 45 µm for a vertical exit slit of 100 µm. The smaller X-ray spot results in a substantial decrease in the gas-phase contribution of the spectra from 40% down to 20% and will help to simplify the interpretation and peak assignments of future experiments.
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Affiliation(s)
- Giorgia Olivieri
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich, CH-8093 Zurich, Switzerland
| | - Alok Goel
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich, CH-8093 Zurich, Switzerland
| | - Armin Kleibert
- Swiss Light Source, Paul Scherrer Institut, CH-5023 Villigen PSI, Switzerland
- Correspondence e-mail: ,
| | - Matthew A. Brown
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich, CH-8093 Zurich, Switzerland
- Correspondence e-mail: ,
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30
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Su CC, Yu Y, Chang PC, Chen YW, Chen IY, Lee YY, Wang CC. VUV Photoelectron Spectroscopy of Cysteine Aqueous Aerosols: A Microscopic View of Its Nucleophilicity at Varying pH Conditions. J Phys Chem Lett 2015; 6:817-23. [PMID: 26262658 DOI: 10.1021/acs.jpclett.5b00002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Cysteine (Cys) is unique due to its highly reactive thiol group. It often regulates the biological function of proteins by acting as the redox site. Despite its biological significance, however, the valence electronic structure of Cys under the aqueous environments remains unavailable. Here, we report the VUV photoelectron spectroscopy of Cys aqueous aerosols via a newly built aerosol VUV photoelectron spectroscopy apparatus. The photoelectron spectra of Cys show distinct band shapes at varying pH conditions, reflecting the altered molecular orbital characters when its dominating form changes. The ionization energy of Cys is determined to be 8.98 ± 0.05 eV at low pH. A new feature at a binding energy of 6.97 ± 0.05 eV is observed at high pH, suggesting that the negative charge on the thiolate group becomes the first electron to be removed upon ionization. This work implies that when Cys is involved in redox processes, the charge transfer mechanism may be entirely altered under different pH conditions.
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Affiliation(s)
- Chien-Cheng Su
- †Department of Chemistry, National Sun Yat-sen University, 80424 Kaohsiung, Taiwan, Republic of China
| | - Youqing Yu
- †Department of Chemistry, National Sun Yat-sen University, 80424 Kaohsiung, Taiwan, Republic of China
| | - Po-Chiao Chang
- †Department of Chemistry, National Sun Yat-sen University, 80424 Kaohsiung, Taiwan, Republic of China
| | - Yu-Wei Chen
- †Department of Chemistry, National Sun Yat-sen University, 80424 Kaohsiung, Taiwan, Republic of China
| | - I-Ying Chen
- †Department of Chemistry, National Sun Yat-sen University, 80424 Kaohsiung, Taiwan, Republic of China
| | - Yin-Yu Lee
- ‡National Synchrotron Radiation Research Center, 30076 Hsinchu, Taiwan, Republic of China
| | - Chia C Wang
- †Department of Chemistry, National Sun Yat-sen University, 80424 Kaohsiung, Taiwan, Republic of China
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31
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da Silva ÁM, Mocellin A, Monti S, Li C, Marinho RRT, Medina A, Agren H, Carravetta V, de Brito AN. Surface-Altered Protonation Studied by Photoelectron Spectroscopy and Reactive Dynamics Simulations. J Phys Chem Lett 2015; 6:807-811. [PMID: 26262656 DOI: 10.1021/acs.jpclett.5b00131] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The extent to which functional groups are protonated at aqueous interfaces as compared to bulk is deemed essential to several areas in chemistry and biology. The origin of such changes has been the source of intense debate. We use X-ray photoelectron spectroscopy and all-atom reactive molecular dynamics simulations as two independent methods to probe, at the molecular scale, both bulk and surface distributions of protonated species of cysteine in an aqueous solution. We show that the distribution of the cysteine species at the surface is quite different from that in the bulk. We argue that this finding, however, cannot be simply related to a change in the extent of proton sharing between the two conjugate acid/base pairs that may occur between these two regions. The present theoretical simulations identify species at the surface that are not present in the bulk.
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Affiliation(s)
- Áderson Miranda da Silva
- †Institute of Physics, Brasilia University, Box 4455, 70910-970 Brası́lia, Distrito Federal, Brazil
| | - Alexandra Mocellin
- †Institute of Physics, Brasilia University, Box 4455, 70910-970 Brası́lia, Distrito Federal, Brazil
| | - Susanna Monti
- ‡CNR-ICCOM, Institute of Chemistry of Organometallic Compounds, via G. Moruzzi 1, I-56124 Pisa, Italy
- §Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden
| | - Cui Li
- §Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden
- ∥CNR-IPCF, Institute of Chemical and Physical Processes, via G.Moruzzi 1, I-56124 Pisa, Italy
| | - Ricardo R T Marinho
- ⊥Institute of Physics, Federal University of Bahia, 40210-340 Salvador, Bahia, Brazil
| | - Aline Medina
- ⊥Institute of Physics, Federal University of Bahia, 40210-340 Salvador, Bahia, Brazil
| | - Hans Agren
- §Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden
| | - Vincenzo Carravetta
- ∥CNR-IPCF, Institute of Chemical and Physical Processes, via G.Moruzzi 1, I-56124 Pisa, Italy
| | - Arnaldo Naves de Brito
- #Institute of Physics "Gleb Wataghin", University of Campinas (Unicamp), 13083-859 Campinas, São Paulo, Brazil
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32
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Walz MM, Caleman C, Werner J, Ekholm V, Lundberg D, Prisle NL, Öhrwall G, Björneholm O. Surface behavior of amphiphiles in aqueous solution: a comparison between different pentanol isomers. Phys Chem Chem Phys 2015; 17:14036-44. [DOI: 10.1039/c5cp01870f] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular-level understanding of concentration-dependent changes in the surface structure of different amphiphilic isomers at the water–vapor interface was gained by molecular dynamics (MD) simulation and X-ray photoelectron spectroscopy (XPS).
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Affiliation(s)
- M.-M. Walz
- Uppsala University
- Department of Physics and Astronomy
- 75120 Uppsala
- Sweden
| | - C. Caleman
- Uppsala University
- Department of Physics and Astronomy
- 75120 Uppsala
- Sweden
- Center for Free-Electron Laser Science
| | - J. Werner
- Uppsala University
- Department of Physics and Astronomy
- 75120 Uppsala
- Sweden
- Swedish University of Agricultural Sciences
| | - V. Ekholm
- Uppsala University
- Department of Physics and Astronomy
- 75120 Uppsala
- Sweden
| | - D. Lundberg
- Swedish University of Agricultural Sciences
- Department of Chemistry and Biotechnology
- 75007 Uppsala
- Sweden
| | - N. L. Prisle
- Department of Physics
- Helsinki University
- 00014 Helsinki
- Finland
| | - G. Öhrwall
- MAX IV Laboratory
- Lund University
- 22100 Lund
- Sweden
| | - O. Björneholm
- Uppsala University
- Department of Physics and Astronomy
- 75120 Uppsala
- Sweden
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33
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Li H, Li L, Jiang J, Lin Z, Luo Y. Theoretical spectroscopic studies on chemical and electronic structures of arginylglycine. Phys Chem Chem Phys 2015; 17:24754-60. [DOI: 10.1039/c5cp03729h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The global minimum of the dipeptide ArgGly is found to be in the canonical form, rather than the zwitterionic form.
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Affiliation(s)
- Hongbao Li
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science and Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology
- Guizhou Normal College
- Guiyang
- China
| | - Leilei Li
- Hefei National Laboratory for Physical Sciences at the Microscale
- School of Chemistry and Materials Science
- University of Science and Technology of China
- Hefei
- China
| | - Jun Jiang
- Hefei National Laboratory for Physical Sciences at the Microscale
- School of Chemistry and Materials Science
- University of Science and Technology of China
- Hefei
- China
| | - Zijing Lin
- Hefei National Laboratory for Physical Sciences at the Microscale
- School of Chemistry and Materials Science
- University of Science and Technology of China
- Hefei
- China
| | - Yi Luo
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science and Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology
- Guizhou Normal College
- Guiyang
- China
- Hefei National Laboratory for Physical Sciences at the Microscale
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34
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Meyer F, Blum M, Benkert A, Hauschild D, Nagarajan S, Wilks RG, Andersson J, Yang W, Zharnikov M, Bär M, Heske C, Reinert F, Weinhardt L. “Building Block Picture” of the Electronic Structure of Aqueous Cysteine Derived from Resonant Inelastic Soft X-ray Scattering. J Phys Chem B 2014; 118:13142-50. [DOI: 10.1021/jp5089417] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- F. Meyer
- Experimentelle
Physik VII, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - M. Blum
- Department
of Chemistry, University of Nevada, Las Vegas, 4505 Maryland
Parkway, Las Vegas, Nevada 89154-4003, United States
| | - A. Benkert
- Experimentelle
Physik VII, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - D. Hauschild
- Experimentelle
Physik VII, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - S. Nagarajan
- Angewandte
Physikalische Chemie, Universität Heidelberg, INF 253,69120 Heidelberg, Germany
| | - R. G. Wilks
- Solar
Energy Research, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
| | - J. Andersson
- Department
of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
| | - W. Yang
- Advanced
Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron
Road, Berkeley, California 94720, United States
| | - M. Zharnikov
- Angewandte
Physikalische Chemie, Universität Heidelberg, INF 253,69120 Heidelberg, Germany
| | - M. Bär
- Department
of Chemistry, University of Nevada, Las Vegas, 4505 Maryland
Parkway, Las Vegas, Nevada 89154-4003, United States
- Solar
Energy Research, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
- Institut
für Physik und Chemie, Brandenburgische Technische Universität Cottbus-Senftenberg, Platz der Deutschen Einheit 1, 03046 Cottbus, Germany
| | - C. Heske
- Department
of Chemistry, University of Nevada, Las Vegas, 4505 Maryland
Parkway, Las Vegas, Nevada 89154-4003, United States
- Institute
for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstrasse 18/20, 76128 Karlsruhe, Germany
| | - F. Reinert
- Experimentelle
Physik VII, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - L. Weinhardt
- Department
of Chemistry, University of Nevada, Las Vegas, 4505 Maryland
Parkway, Las Vegas, Nevada 89154-4003, United States
- Institute
for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstrasse 18/20, 76128 Karlsruhe, Germany
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35
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Tolbatov I, Chipman DM. Comparative study of Gaussian basis sets for calculation of core electron binding energies in first-row hydrides and glycine. Theor Chem Acc 2014. [DOI: 10.1007/s00214-014-1560-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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36
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Werner J, Wernersson E, Ekholm V, Ottosson N, Öhrwall G, Heyda J, Persson I, Söderström J, Jungwirth P, Björneholm O. Surface Behavior of Hydrated Guanidinium and Ammonium Ions: A Comparative Study by Photoelectron Spectroscopy and Molecular Dynamics. J Phys Chem B 2014; 118:7119-27. [DOI: 10.1021/jp500867w] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Josephina Werner
- Department
of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
- Department
of Chemistry and Biotechnology, Swedish University of Agricultural Sciences,
P.O. Box 7015, SE-750 07 Uppsala, Sweden
| | - Erik Wernersson
- Institute
of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, CZ-16610 Prague 6, Czech Republic
| | - Victor Ekholm
- Department
of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
| | - Niklas Ottosson
- Department
of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
| | - Gunnar Öhrwall
- MAX
IV Laboratory, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden
| | - Jan Heyda
- Institute
of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, CZ-16610 Prague 6, Czech Republic
| | - Ingmar Persson
- Department
of Chemistry and Biotechnology, Swedish University of Agricultural Sciences,
P.O. Box 7015, SE-750 07 Uppsala, Sweden
| | - Johan Söderström
- Department
of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
| | - Pavel Jungwirth
- Institute
of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, CZ-16610 Prague 6, Czech Republic
| | - Olle Björneholm
- Department
of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
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37
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Tolbatov I, Chipman DM. Performance of density functionals for computation of core electron binding energies in first-row hydrides and glycine. Theor Chem Acc 2014. [DOI: 10.1007/s00214-014-1473-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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38
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Eriksson SK, Josefsson I, Ottosson N, Öhrwall G, Björneholm O, Siegbahn H, Hagfeldt A, Odelius M, Rensmo H. Solvent Dependence of the Electronic Structure of I– and I3–. J Phys Chem B 2014; 118:3164-74. [PMID: 24564292 DOI: 10.1021/jp500533n] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Susanna K. Eriksson
- Department
of Chemistry-Ångström, Uppsala University, Box 523, SE-751
20 Uppsala, Sweden
| | - Ida Josefsson
- Department
of Physics, Stockholm University, AlbaNova University Center, SE-106
91 Stockholm, Sweden
| | - Niklas Ottosson
- FOM Institute AMOLF, Science
Park 102, 1098 XG Amsterdam, The Netherlands
| | - Gunnar Öhrwall
- MAX
IV Laboratory, Lund University, Box 118, 221 00 Lund, Sweden
| | - Olle Björneholm
- Department
of Physics and Astronomy, Molecular and Condensed Matter Physics, Uppsala University, Box
530, SE-752 21 Uppsala, Sweden
| | - Hans Siegbahn
- Department
of Physics and Astronomy, Molecular and Condensed Matter Physics, Uppsala University, Box
530, SE-752 21 Uppsala, Sweden
| | - Anders Hagfeldt
- Department
of Chemistry-Ångström, Uppsala University, Box 523, SE-751
20 Uppsala, Sweden
| | - Michael Odelius
- Department
of Physics, Stockholm University, AlbaNova University Center, SE-106
91 Stockholm, Sweden
| | - Håkan Rensmo
- Department
of Physics and Astronomy, Molecular and Condensed Matter Physics, Uppsala University, Box
530, SE-752 21 Uppsala, Sweden
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39
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Niskanen J, Arul Murugan N, Rinkevicius Z, Vahtras O, Li C, Monti S, Carravetta V, Ågren H. Hybrid density functional–molecular mechanics calculations for core-electron binding energies of glycine in water solution. Phys Chem Chem Phys 2013; 15:244-54. [DOI: 10.1039/c2cp43264a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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40
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Josefsson I, Eriksson SK, Ottosson N, Öhrwall G, Siegbahn H, Hagfeldt A, Rensmo H, Björneholm O, Odelius M. Collective hydrogen-bond dynamics dictates the electronic structure of aqueous I3−. Phys Chem Chem Phys 2013; 15:20189-96. [DOI: 10.1039/c3cp52866a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Blum M, Odelius M, Weinhardt L, Pookpanratana S, Bär M, Zhang Y, Fuchs O, Yang W, Umbach E, Heske C. Ultrafast Proton Dynamics in Aqueous Amino Acid Solutions Studied by Resonant Inelastic Soft X-ray Scattering. J Phys Chem B 2012; 116:13757-64. [DOI: 10.1021/jp302958j] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Blum
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, United States
- Experimentelle Physik
VII, Universität Würzburg, Würzburg, Germany
| | - M. Odelius
- Fysikum, Albanova University Center, Stockholm University, Stockholm, Sweden
| | - L. Weinhardt
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
- Experimentelle Physik
VII, Universität Würzburg, Würzburg, Germany
| | - S. Pookpanratana
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
| | - M. Bär
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
- Solar Energy Research, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany
- Brandenburgische Technische Universität, Cottbus, Germany
| | - Y. Zhang
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
| | - O. Fuchs
- Experimentelle Physik
VII, Universität Würzburg, Würzburg, Germany
| | - W. Yang
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, United States
| | | | - C. Heske
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
- Institute for Chemical
Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany
- ANKA Synchrotron
Radiation Facility, Karlsruhe Institute of Technology, Karlsruhe, Germany
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42
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Ottosson N, Romanova AO, Söderström J, Björneholm O, Öhrwall G, Fedorov MV. Molecular Sinkers: X-ray Photoemission and Atomistic Simulations of Benzoic Acid and Benzoate at the Aqueous Solution/Vapor Interface. J Phys Chem B 2012; 116:13017-23. [DOI: 10.1021/jp300956j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Niklas Ottosson
- Department of Physics and Astronomy, Uppsala University, SE-751 20 Uppsala, Sweden
| | - Anastasia O. Romanova
- Max Planck Institute for Mathematics in the Sciences, Inselstrasse 22, D
04103, Leipzig, Germany
| | - Johan Söderström
- Department of Physics and Astronomy, Uppsala University, SE-751 20 Uppsala, Sweden
| | - Olle Björneholm
- Department of Physics and Astronomy, Uppsala University, SE-751 20 Uppsala, Sweden
| | - Gunnar Öhrwall
- MAX-lab, Lund University, Box 118, SE-221 00 Lund, Sweden
| | - Maxim V. Fedorov
- Max Planck Institute for Mathematics in the Sciences, Inselstrasse 22, D
04103, Leipzig, Germany
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43
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Li H, Hua W, Lin Z, Luo Y. First-Principles Study on Core-Level Spectroscopy of Arginine in Gas and Solid Phases. J Phys Chem B 2012; 116:12641-50. [DOI: 10.1021/jp302309u] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Hongbao Li
- Hefei National Laboratory
for
Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei,
Anhui, 230026, China
- Department
of Theoretical Chemistry
and Biology, School of Biotechnology, Royal Institute of Technology, S-106 91 Stockholm, Sweden
| | - Weijie Hua
- Department
of Theoretical Chemistry
and Biology, School of Biotechnology, Royal Institute of Technology, S-106 91 Stockholm, Sweden
| | - Zijing Lin
- Hefei National Laboratory
for
Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei,
Anhui, 230026, China
| | - Yi Luo
- Hefei National Laboratory
for
Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei,
Anhui, 230026, China
- Department
of Theoretical Chemistry
and Biology, School of Biotechnology, Royal Institute of Technology, S-106 91 Stockholm, Sweden
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Kryzhevoi NV, Cederbaum LS. Exploring Protonation and Deprotonation Effects with Auger Electron Spectroscopy. J Phys Chem Lett 2012; 3:2733-2737. [PMID: 26295900 DOI: 10.1021/jz301130t] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Auger electron spectroscopy is demonstrated to be a very efficient tool to probe alterations in local chemical environment due to changes in protonation states. We show that electronic and geometric structure changes induced by protonation or deprotonation are well reflected in Auger spectra through characteristic chemical shifts and spectral shape variations. We also present evidence that Auger spectra are sensitive to relative concentrations of compounds in different protonation states. Special attention is paid to the high kinetic energy spectral regions that exhibit remarkable features resulting from core ICD-like transitions in normal species and Auger transitions in deprotonated fragments. The latter contribution was so far ignored when explaining Auger spectra of species embedded in the environment. This contribution should be reconsidered, taking into account the recently discovered possibility of ultrafast dissociation of core-ionized hydrogen-bonded systems in media.
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Affiliation(s)
- Nikolai V Kryzhevoi
- Theoretical Chemistry, Institute of Physical Chemistry, Heidelberg University, D-69120 Heidelberg, Germany
| | - Lorenz S Cederbaum
- Theoretical Chemistry, Institute of Physical Chemistry, Heidelberg University, D-69120 Heidelberg, Germany
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45
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Brown MA, Vila F, Sterrer M, Thürmer S, Winter B, Ammann M, Rehr JJ, van Bokhoven JA. Electronic Structures of Formic Acid (HCOOH) and Formate (HCOO(-)) in Aqueous Solutions. J Phys Chem Lett 2012; 3:1754-1759. [PMID: 26291855 DOI: 10.1021/jz300510r] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The electronic structures of formic acid (HCOOH) and formate (HCOO(-)) have been determined in aqueous solutions over a pH range of 1.88-8.87 using a combination of X-ray photoelectron spectroscopy (XPS), partial electron-yield X-ray absorption spectroscopy (PEY XAS), and density functional theory (DFT). The carbon 1s XPS measurements reveal a binding energy shift of -1.3 eV for deprotonated HCOO(-) compared with neutral HCOOH. Such distinction between neutral HCOOH and deprotonated HCOO(-) cannot be made based solely on the respective carbon K-edge PEY XA spectra. Independent of pH, the C1s → π* state excitations occur at 288.0 eV and may lead to the incorrect conclusion that the energy levels of the π* state are the same for both species. The DFT calculations are consistent with the experimental observations and show a shift to higher energy for both the occupied C1s (lower binding energy) and unoccupied π* orbitals of deprotonated HCOO(-) compared to neutral HCOOH in aqueous solutions.
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Affiliation(s)
- Matthew A Brown
- †Institute for Chemical and Bioengineering, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Fernando Vila
- ‡Department of Physics, University of Washington, Seattle, Washington, 98195, United States
| | - Martin Sterrer
- §Department of Chemical Physics, Fritz-Haber-Institute der Max-Planck-Gesellschaft, D-14195 Berlin, Germany
| | - Stephan Thürmer
- ∥Helmholtz-Zentrum Berlin für Materialien und Energie and BESSY, D-12489 Berlin, Germany
| | - Bernd Winter
- ∥Helmholtz-Zentrum Berlin für Materialien und Energie and BESSY, D-12489 Berlin, Germany
| | - Markus Ammann
- ⊥Laboratory for Radiochemistry and Environmental Chemistry, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - John J Rehr
- ‡Department of Physics, University of Washington, Seattle, Washington, 98195, United States
| | - Jeroen A van Bokhoven
- †Institute for Chemical and Bioengineering, ETH Zürich, CH-8093 Zürich, Switzerland
- #Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
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46
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Hua W, Ai YJ, Gao B, Li H, Ågren H, Luo Y. X-ray spectroscopy of blocked alanine in water solution from supermolecular and supermolecular-continuum solvation models: a first-principles study. Phys Chem Chem Phys 2012; 14:9666-75. [DOI: 10.1039/c2cp40732a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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47
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Seidel R, Thürmer S, Moens J, Geerlings P, Blumberger J, Winter B. Valence Photoemission Spectra of Aqueous Fe2+/3+ and [Fe(CN)6]4–/3– and Their Interpretation by DFT Calculations. J Phys Chem B 2011; 115:11671-7. [DOI: 10.1021/jp203997p] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Robert Seidel
- Helmholtz-Zentrum Berlin für Materialien und Energie, and BESSY, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
| | - Stephan Thürmer
- Helmholtz-Zentrum Berlin für Materialien und Energie, and BESSY, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
| | - Jan Moens
- Faculty of Sciences, Department of General Chemistry, Free University of Brussels (VUB), Pleinlaan 2, 1050 Brussels, Belgium
| | - Paul Geerlings
- Faculty of Sciences, Department of General Chemistry, Free University of Brussels (VUB), Pleinlaan 2, 1050 Brussels, Belgium
| | - Jochen Blumberger
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Bernd Winter
- Helmholtz-Zentrum Berlin für Materialien und Energie, and BESSY, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
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Ottosson N, Wernersson E, Söderström J, Pokapanich W, Kaufmann S, Svensson S, Persson I, Öhrwall G, Björneholm O. The protonation state of small carboxylic acids at the water surface from photoelectron spectroscopy. Phys Chem Chem Phys 2011; 13:12261-7. [DOI: 10.1039/c1cp20245f] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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