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Malý P, Brixner T. Fluoreszenz‐detektierte Pump‐Probe‐Spektroskopie. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202102901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Pavel Malý
- Institut für Physikalische und Theoretische Chemie Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - Tobias Brixner
- Institut für Physikalische und Theoretische Chemie Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Center for Nanosystems Chemistry (CNC) Universität Würzburg Theodor-Boveri-Weg 97074 Würzburg Deutschland
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Malý P, Brixner T. Fluorescence-Detected Pump-Probe Spectroscopy. Angew Chem Int Ed Engl 2021; 60:18867-18875. [PMID: 34152074 PMCID: PMC8457154 DOI: 10.1002/anie.202102901] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 06/17/2021] [Indexed: 12/11/2022]
Abstract
We introduce a new approach to transient spectroscopy, fluorescence-detected pump-probe (F-PP) spectroscopy, that overcomes several limitations of traditional PP. F-PP suppresses excited-state absorption, provides background-free detection, removes artifacts resulting from pump-pulse scattering, from non-resonant solvent response, or from coherent pulse overlap, and allows unique extraction of excited-state dynamics under certain conditions. Despite incoherent detection, time resolution of F-PP is given by the duration of the laser pulses, independent of the fluorescence lifetime. We describe the working principle of F-PP and provide its theoretical description. Then we illustrate specific features of F-PP by direct comparison with PP, theoretically and experimentally. For this purpose, we investigate, with both techniques, a molecular squaraine heterodimer, core-shell CdSe/ZnS quantum dots, and fluorescent protein mCherry. F-PP is broadly applicable to chemical systems in various environments and in different spectral regimes.
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Affiliation(s)
- Pavel Malý
- Institut für Physikalische und Theoretische ChemieUniversität WürzburgAm Hubland97074WürzburgGermany
| | - Tobias Brixner
- Institut für Physikalische und Theoretische ChemieUniversität WürzburgAm Hubland97074WürzburgGermany
- Center for Nanosystems Chemistry (CNC)Universität WürzburgTheodor-Boveri-Weg97074WürzburgGermany
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3
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Vyshnepolsky M, Ding ZB, Srivastava P, Tesarik P, Mazhar H, Maestri M, Morgenstern K. The Influence of a Changing Local Environment during Photoinduced CO 2 Dissociation. Angew Chem Int Ed Engl 2021; 60:18217-18222. [PMID: 33999493 PMCID: PMC8456919 DOI: 10.1002/anie.202105468] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Indexed: 11/11/2022]
Abstract
Though largely influencing the efficiency of a reaction, the molecular-scale details of the local environment of the reactants are experimentally inaccessible hindering an in-depth understanding of a catalyst's reactivity, a prerequisite to maximizing its efficiency. We introduce a method to follow individual molecules and their largely changing environment during a photochemical reaction. The method is illustrated for a rate-limiting step in a photolytic reaction, the dissociation of CO2 on two catalytically relevant surfaces, Ag(100) and Cu(111). We reveal with a single-molecule resolution how the reactant's surroundings evolve with progressing laser illumination and with it their propensity for dissociation. Counteracting processes lead to a volcano-like reactivity. Our unprecedented local view during a photoinduced reaction opens the avenue for understanding the influence of the products on reaction yields on the nanoscale.
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Affiliation(s)
- Michael Vyshnepolsky
- Physikalische Chemie I, Ruhr-Universität Bochum, Universitätsstraße 150, 44801, Bochum, Germany
| | - Zhao-Bin Ding
- Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, via La Masa 34, 20156, Milano, Italy
| | - Prashant Srivastava
- Physikalische Chemie I, Ruhr-Universität Bochum, Universitätsstraße 150, 44801, Bochum, Germany
| | - Patrik Tesarik
- Physikalische Chemie I, Ruhr-Universität Bochum, Universitätsstraße 150, 44801, Bochum, Germany
| | - Hussain Mazhar
- Physikalische Chemie I, Ruhr-Universität Bochum, Universitätsstraße 150, 44801, Bochum, Germany
| | - Matteo Maestri
- Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, via La Masa 34, 20156, Milano, Italy
| | - Karina Morgenstern
- Physikalische Chemie I, Ruhr-Universität Bochum, Universitätsstraße 150, 44801, Bochum, Germany
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Vyshnepolsky M, Ding Z, Srivastava P, Tesarik P, Mazhar H, Maestri M, Morgenstern K. The Influence of a Changing Local Environment during Photoinduced CO
2
Dissociation. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202105468] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Michael Vyshnepolsky
- Physikalische Chemie I Ruhr-Universität Bochum Universitätsstraße 150 44801 Bochum Germany
| | - Zhao‐Bin Ding
- Laboratory of Catalysis and Catalytic Processes Dipartimento di Energia, Politecnico di Milano via La Masa 34 20156 Milano Italy
| | - Prashant Srivastava
- Physikalische Chemie I Ruhr-Universität Bochum Universitätsstraße 150 44801 Bochum Germany
| | - Patrik Tesarik
- Physikalische Chemie I Ruhr-Universität Bochum Universitätsstraße 150 44801 Bochum Germany
| | - Hussain Mazhar
- Physikalische Chemie I Ruhr-Universität Bochum Universitätsstraße 150 44801 Bochum Germany
| | - Matteo Maestri
- Laboratory of Catalysis and Catalytic Processes Dipartimento di Energia, Politecnico di Milano via La Masa 34 20156 Milano Italy
| | - Karina Morgenstern
- Physikalische Chemie I Ruhr-Universität Bochum Universitätsstraße 150 44801 Bochum Germany
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5
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Collet E, Cammarata M. Disentangling Ultrafast Electronic and Structural Dynamics with X-Ray Lasers. Chemistry 2018; 24:15696-15705. [DOI: 10.1002/chem.201802105] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Indexed: 12/18/2022]
Affiliation(s)
- Eric Collet
- Univ Rennes; CNRS, IPR (Institut de Physique de Rennes)-UMR 6251; 35000 Rennes France
| | - Marco Cammarata
- Univ Rennes; CNRS, IPR (Institut de Physique de Rennes)-UMR 6251; 35000 Rennes France
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Herschbach DR. Michael Polanyi: Patriarch of Chemical Dynamics and Tacit Knowing. Angew Chem Int Ed Engl 2017; 56:3434-3444. [DOI: 10.1002/anie.201610968] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Dudley R. Herschbach
- Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street Cambridge MA 02138 USA
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Herschbach DR. Michael Polanyi: Vater der chemischen Dynamik und des impliziten Wissens. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201610968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Dudley R. Herschbach
- Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street Cambridge MA 02138 USA
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Bouzidi H, Aslan L, El Dib G, Coddeville P, Fittschen C, Tomas A. Investigation of the Gas-Phase Photolysis and Temperature-Dependent OH Reaction Kinetics of 4-Hydroxy-2-butanone. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:12178-12186. [PMID: 26418727 DOI: 10.1021/acs.est.5b02721] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Hydroxyketones are key secondary reaction products in the atmospheric oxidation of volatile organic compounds (VOCs). The fate of these oxygenated VOCs is however poorly understood and scarcely taken into account in atmospheric chemistry modeling. In this work, a combined investigation of the photolysis and temperature-dependent OH radical reaction of 4-hydroxy-2-butanone (4H2B) is presented. The objective was to evaluate the importance of the photolysis process relative to OH oxidation in the atmospheric degradation of 4H2B. A photolysis lifetime of about 26 days was estimated with an effective quantum yield of 0.08. For the first time, the occurrence of a Norrish II mechanism was hypothesized following the observation of acetone among photolysis products. The OH reaction rate coefficient follows the Arrhenius trend (280-358 K) and could be modeled through the following expression: k4H2B(T) = (1.26 ± 0.40) × 10(-12) × exp((398 ± 87)/T) in cm(3) molecule(-1) s(-1). An atmospheric lifetime of 2.4 days regarding the OH + 4H2B reaction was evaluated, indicating that OH oxidation is by far the major degradation channel. The present work underlines the need for further studies on the atmospheric fate of oxygenated VOCs.
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Affiliation(s)
- Hichem Bouzidi
- Mines Douai , Département SAGE, 59500 Douai, France
- Université de Lille , 59655 Villeneuve d'Ascq, France
| | - Lina Aslan
- Mines Douai , Département SAGE, 59500 Douai, France
- Université de Lille , 59655 Villeneuve d'Ascq, France
| | - Gisèle El Dib
- Institut de Physique de Rennes (IPR-Rennes), Département de Physique Moléculaire, UMR 6251 CNRS, 35042 Rennes, France
| | - Patrice Coddeville
- Mines Douai , Département SAGE, 59500 Douai, France
- Université de Lille , 59655 Villeneuve d'Ascq, France
| | - Christa Fittschen
- Université de Lille, PhysicoChimie des Processus de Combustion et de l'Atmosphère (PC2A) UMR 8522 CNRS/Lille 1, Cité scientifique, 59655 Villeneuve d'Ascq Cedex, France
| | - Alexandre Tomas
- Mines Douai , Département SAGE, 59500 Douai, France
- Université de Lille , 59655 Villeneuve d'Ascq, France
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Bertoni R, Lorenc M, Tissot A, Boillot ML, Collet E. Femtosecond photoswitching dynamics and microsecond thermal conversion driven by laser heating in FeIII spin-crossover solids. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.05.024] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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10
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Sølling TI, Kuhlman TS, Stephansen AB, Klein LB, Møller KB. The Non-Ergodic Nature of Internal Conversion. Chemphyschem 2013; 15:249-59. [DOI: 10.1002/cphc.201300926] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 11/22/2013] [Indexed: 11/08/2022]
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11
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Bertoni R, Lorenc M, Tissot A, Servol M, Boillot ML, Collet E. Femtosecond Spin-State Photoswitching of Molecular Nanocrystals Evidenced by Optical Spectroscopy. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201202215] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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12
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Bertoni R, Lorenc M, Tissot A, Servol M, Boillot ML, Collet E. Femtosecond Spin-State Photoswitching of Molecular Nanocrystals Evidenced by Optical Spectroscopy. Angew Chem Int Ed Engl 2012; 51:7485-9. [DOI: 10.1002/anie.201202215] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Indexed: 11/05/2022]
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13
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Collet E, Lorenc M, Cammarata M, Guérin L, Servol M, Tissot A, Boillot ML, Cailleau H, Buron-Le Cointe M. 100 picosecond diffraction catches structural transients of laser-pulse triggered switching in a spin-crossover crystal. Chemistry 2012; 18:2051-5. [PMID: 22246788 DOI: 10.1002/chem.201103048] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Indexed: 11/08/2022]
Abstract
We study by 100 picosecond X-ray diffraction the photo-switching dynamics of single crystal of the orthorhombic polymorph of the spin-crossover complex [(TPA)Fe(TCC)]PF(6), in which TPA = tris(2-pyridyl methyl)amine, TCC(2-) = 3,4,5,6-Cl(4)-Catecholate(2-). In the frame of the emerging field of dynamical structural science, this is made possible by using optical pump/X-ray probe techniques, which allow following in real time structural reorganization at intra- and intermolecular levels associated with the change of spin state in the crystal. We use here the time structure of the synchrotron radiation generating 100 picosecond X-ray pulses, coupled to 100 fs laser excitation. This study has revealed a rich variety of structural reorganizations, associated with the different steps of the dynamical process. Three consecutive regimes are evidenced in the time domain: 1) local molecular photo-switching with structural reorganization at constant volume, 2) volume relaxation with inhomogeneous distribution of local temperatures, 3) homogenization of the crystal in the transient state 100 µs after laser excitation. These findings are fundamentally different from those of conventional diffraction studies of long-lived photoinduced high spin states. The time-resolution used here with picosecond X-ray diffraction probes different physical quantities on their intrinsic time-scale, shedding new light on the successive processes driving macroscopic switching in a functionalized material. These results pave the way for structural studies away from equilibrium and represent a first step toward femtosecond crystallography.
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Affiliation(s)
- Eric Collet
- Institut de Physique de Rennes, UMR 6251 UR1-CNRS, Bat 11 A Campus de Beaulieu, University Rennes 1, 35042 Rennes Cedex, France.
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Bredtmann T, Manz J. Elektronenflüsse zwischen benachbarten Bindungen bei pericyclischen Reaktionen: synchron oder asynchron? Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201104465] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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15
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Bredtmann T, Manz J. Electronic Bond-to-Bond Fluxes in Pericyclic Reactions: Synchronous or Asynchronous? Angew Chem Int Ed Engl 2011; 50:12652-4. [DOI: 10.1002/anie.201104465] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Indexed: 11/08/2022]
Affiliation(s)
- Timm Bredtmann
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany.
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16
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Mohammed O, Jas G, Lin M, Zewail A. Primary Peptide Folding Dynamics Observed with Ultrafast Temperature Jump. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200900513] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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17
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Chergui M, Zewail AH. Electron and X-Ray Methods of Ultrafast Structural Dynamics: Advances and Applications. Chemphyschem 2009; 10:28-43. [DOI: 10.1002/cphc.200800667] [Citation(s) in RCA: 190] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Mohammed OF, Jas GS, Lin MM, Zewail AH. Primary peptide folding dynamics observed with ultrafast temperature jump. Angew Chem Int Ed Engl 2009; 48:5628-32. [PMID: 19382153 PMCID: PMC3006091 DOI: 10.1002/anie.200900513] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Omar F. Mohammed
- Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125, USA
| | - Gouri S. Jas
- Department of Chemistry, Biochemistry, and Institute of Biomedical Studies, Room: C322 Baylor University, 101 Bagby Avenue, Waco, TX 76706, USA
| | - Milo M. Lin
- Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125, USA
| | - Ahmed H. Zewail
- Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125, USA
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Olivucci M, Santoro F. Chemical selectivity through control of excited-state dynamics. Angew Chem Int Ed Engl 2008; 47:6322-5. [PMID: 18680114 DOI: 10.1002/anie.200800898] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Massimo Olivucci
- Dipartimento di Chimica dell'Università di Siena via A. Moro 2, 53100 Siena, Italy.
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Olivucci M, Santoro F. Chemische Selektivität durch Kontrolle der Dynamik angeregter Zustände. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200800898] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Durá J, de Nalda R, Álvarez J, Izquierdo JG, Amaral GA, Bañares L. Femtosecond Transition-State Imaging of theA-Band CH3I Photodissociation. Chemphyschem 2008; 9:1245-9. [DOI: 10.1002/cphc.200800018] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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22
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Wang CR, Lu QB. Real-time observation of a molecular reaction mechanism of aqueous 5-Halo-2'-deoxyuridines under UV/ionizing radiation. Angew Chem Int Ed Engl 2007; 46:6316-20. [PMID: 17639519 DOI: 10.1002/anie.200701559] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Chun-Rong Wang
- Department of Physics and Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada
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Wang CR, Lu QB. Real-Time Observation of a Molecular Reaction Mechanism of Aqueous 5-Halo-2′-deoxyuridines under UV/Ionizing Radiation. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200701559] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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25
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Breher F. Stretching bonds in main group element compounds—Borderlines between biradicals and closed-shell species. Coord Chem Rev 2007. [DOI: 10.1016/j.ccr.2006.09.007] [Citation(s) in RCA: 271] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Schaniel D, Cormary B, Malfant I, Valade L, Woike T, Delley B, Krämer KW, Güdel HU. Photogeneration of two metastable NO linkage isomers with high populations of up to 76% in trans-[RuCl(py)4(NO)][PF6]2·½H2O. Phys Chem Chem Phys 2007; 9:3717-24. [PMID: 17622406 DOI: 10.1039/b704778a] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two light-induced metastable NO linkage isomers with oxygen-bound (SI) and side-on configuration (SII) of NO are generated in trans-[RuCl(py)(4)(NO)][PF(6)](2).(1/2)H(2)O. Irradiation by light in the blue-green spectral range (450-530 nm) leads to the population of SI. A further irradiation by near infrared light (920-1100 nm) transfers SI into SII at temperatures below 150 K. The heat release during the thermal decay of the linkage isomers shows that SI and SII are separated from the ground state (GS) by potential barriers of E(A)(SI) = 0.70(3) eV and E(A)(SII) = 0.38(3) eV, and are energetically situated at 1.42(6) eV and 1.07(7) eV above the ground state, respectively. Maximum populations of 76% for SI and of 56% for SII can be generated, as determined by the decrease of the nu(NO) stretching absorption band of the ground state. The nu(NO) stretching vibration shifts to lower energies by 143 cm(-1) in SI and by 300 cm(-1) in SII, indicating that the linkage isomers are of the same type as found in other octahedrally coordinated transition-metal nitrosyl complexes. The experimental observations are in agreement with results from calculations by the density functional theory, which predict that the metastable states correspond to a side-on bonded (SII) and an isonitrosyl (SI) configuration of the NO ligand. The calculations provide the energy minima of the ground state and the metastable states SI and SII as well as the saddle points along the reaction coordinate Q. This reaction coordinate corresponds to a rotation of the NO ligand by about 90 degrees (SII) and 180 degrees (SI), and therefore allows the comparison between observed and calculated activation energies.
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Affiliation(s)
- Dominik Schaniel
- I. Physikalisches Institut, Universität zu Köln, Zülpicherstrasse 77, 50937, Köln, Germany.
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Barth I, Manz J. Anregung periodischer Elektronen-Kreisbewegung durch circular polarisierte Laserpulse: quantenmechanische Modell-Simulationen für Mg-Porphyrin. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200504147] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Barth I, Manz J. Periodic Electron Circulation Induced by Circularly Polarized Laser Pulses: Quantum Model Simulations for Mg Porphyrin. Angew Chem Int Ed Engl 2006; 45:2962-5. [PMID: 16555355 DOI: 10.1002/anie.200504147] [Citation(s) in RCA: 146] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ingo Barth
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany
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Dietzek B, Maksimenka R, Siebert T, Birckner E, Kiefer W, Popp J, Hermann G, Schmitt M. Excited-state processes in protochlorophyllide a – a femtosecond time-resolved absorption study. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.08.075] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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32
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Affiliation(s)
- Yousung Jung
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA
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Sølling TI, Diau EWG, Kötting C, De Feyter S, Zewail AH. Femtochemistry of Norrish type-I reactions: IV. Highly excited ketones--experimental. Chemphyschem 2002; 3:79-97. [PMID: 12465478 DOI: 10.1002/1439-7641(20020118)3:1<79::aid-cphc79>3.0.co;2-#] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Femtosecond dynamics of Norrish type-I reactions of cyclic and acyclic ketones have been investigated in real time for a series of 13 compounds using femtosecond-resolved time-of-flight mass spectrometry. A general physical description of the ultrafast processes of ketones excited into a high-lying Rydberg state is presented. It accounts not only for the results that are presented herein but also for the results of previously reported studies. For highly excited ketones, we show that the Norrish type-I reaction is nonconcerted, and that the first bond breakage occurs along the effectively repulsive S2 surface involving the C-C bond in a manner which is similar to that of ketones in the S1 state (E. W.-G. Diau et al. ChemPhysChem 2001, 2, 273-293). The experimental results show that the wave packet motion out of the initial Franck-Condon region and down to the S2 state can be resolved. This femtosecond (fs) internal conversion from the highly excited Rydberg state to the S2 state proceeds through conical intersections (Rydberg-valence) that are accessed through the C=O stretching motion. In one of these conical intersections, the internal energy is guided into an asymmetric stretching mode. This explains the previously reported pronounced nonstatistical nature of the reaction. The second bond breakage involves an excited-state acyl radical and occurs on a time scale that is up to one order of magnitude longer than the first. We discuss the details regarding the ion chemistry, which determines the appearance of the mass spectra that arise from ionization on the fs time scale. The experimental results presented here, aided by the theoretical work reported in paper III, provide a unified picture of Norrish reactions on excited states and on the ground-state potential energy surfaces.
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Affiliation(s)
- Theis I Sølling
- Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125, USA.
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Sølling TI, Diau EWG, Kötting C, De Feyter S, Zewail AH. Femtochemistry of Norrish Type-I Reactions: IV. Highly Excited Ketones—Experimental. Chemphyschem 2002. [DOI: 10.1002/1439-7641(20020118)3:1<79::aid-cphc79>3.0.co;2-%23] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Sølling TI, Diau EW, Kötting C, De Feyter S, Zewail AH. Femtochemistry of Norrish Type‐I Reactions: IV. Highly Excited Ketones—Experimental. Chemphyschem 2002. [DOI: 10.1002/1439-7641(20020118)3:1%3c79::aid-cphc79%3e3.0.co;2-%23] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Theis I. Sølling
- Arthur Amos Noyes Laboratory of Chemical Physics California Institute of Technology Pasadena, CA 91125, (USA) Fax: (+1) 626‐792‐8456 http://www.its.caltech.edu/∼femto/
| | - Eric W.‐G. Diau
- Arthur Amos Noyes Laboratory of Chemical Physics California Institute of Technology Pasadena, CA 91125, (USA) Fax: (+1) 626‐792‐8456 http://www.its.caltech.edu/∼femto/
| | - Carsten Kötting
- Arthur Amos Noyes Laboratory of Chemical Physics California Institute of Technology Pasadena, CA 91125, (USA) Fax: (+1) 626‐792‐8456 http://www.its.caltech.edu/∼femto/
| | - Steven De Feyter
- Arthur Amos Noyes Laboratory of Chemical Physics California Institute of Technology Pasadena, CA 91125, (USA) Fax: (+1) 626‐792‐8456 http://www.its.caltech.edu/∼femto/
| | - Ahmed H. Zewail
- Arthur Amos Noyes Laboratory of Chemical Physics California Institute of Technology Pasadena, CA 91125, (USA) Fax: (+1) 626‐792‐8456 http://www.its.caltech.edu/∼femto/
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Fujimura Y, González L, Hoki K, Kröner D, Manz J, Ohtsuki Y. Zur Laserpuls-Präparation reiner Enantiomere aus einem Racemat: quantenmechanische Modellsimulation für H2POSH. Angew Chem Int Ed Engl 2000. [DOI: 10.1002/1521-3757(20001215)112:24<4785::aid-ange4785>3.0.co;2-l] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Fujimura Y, González L, Hoki K, Kröner D, Manz J, Ohtsuki Y. From a Racemate to a Pure Enantiomer by Laser Pulses: Quantum Model Simulations for H2POSH. Angew Chem Int Ed Engl 2000. [DOI: 10.1002/1521-3773(20001215)39:24%3c4586::aid-anie4586%3e3.0.co;2-h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Fujimura Y, González L, Hoki K, Kröner D, Manz J, Ohtsuki Y. From a Racemate to a Pure Enantiomer by Laser Pulses: Quantum Model Simulations for H(2)POSH This work was supported by the DFG (project Ma 515/18-1) and the JSPS. Angew Chem Int Ed Engl 2000; 39:4586-4588. [PMID: 11169678 DOI: 10.1002/1521-3773(20001215)39:24<4586::aid-anie4586>3.0.co;2-h] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yuichi Fujimura
- Department of Chemistry, Graduate School of Science Tohoku University, Sendai 980-8578 (Japan)
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