1
|
Recio P, Cachón J, Rubio-Lago L, Chicharro DV, Zanchet A, Limão-Vieira P, de Oliveira N, Samartzis PC, Marggi Poullain S, Bañares L. Imaging the Photodissociation Dynamics and Fragment Alignment of CH 2BrI at 193 nm. J Phys Chem A 2022; 126:8404-8422. [DOI: 10.1021/acs.jpca.2c05897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Pedro Recio
- Departamento de Química Física (Unidad Asociada I+D+i al CSIC), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040Madrid, Spain
| | - Javier Cachón
- Departamento de Química Física (Unidad Asociada I+D+i al CSIC), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040Madrid, Spain
| | - Luis Rubio-Lago
- Departamento de Química Física (Unidad Asociada I+D+i al CSIC), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040Madrid, Spain
| | - David V. Chicharro
- Departamento de Química Física (Unidad Asociada I+D+i al CSIC), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040Madrid, Spain
- Quantum Dynamics & Control, Max Planck Institute for Nuclear Physics (MPIK), Saupfercheckweg 1, 69117Heidelberg, Germany
| | - Alexandre Zanchet
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 123, 28006Madrid, Spain
| | - Paulo Limão-Vieira
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516Caparica, Portugal
| | - Nelson de Oliveira
- Synchrotron SOLEIL, L’Orme des Merisiers, St. Aubin, BP 48, 91192Gif sur Yvette, France
| | - Peter C. Samartzis
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas (FORTH-IESL), Vassilika Vouton, 70013Heraklion, Greece
| | - Sonia Marggi Poullain
- Departamento de Química Física (Unidad Asociada I+D+i al CSIC), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040Madrid, Spain
| | - Luis Bañares
- Departamento de Química Física (Unidad Asociada I+D+i al CSIC), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040Madrid, Spain
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanoscience), Cantoblanco, 28049Madrid, Spain
| |
Collapse
|
2
|
Kim H, Kim JG, Kim TW, Lee SJ, Nozawa S, Adachi SI, Yoon K, Kim J, Ihee H. Ultrafast structural dynamics of in-cage isomerization of diiodomethane in solution. Chem Sci 2020; 12:2114-2120. [PMID: 34163975 PMCID: PMC8179290 DOI: 10.1039/d0sc05108j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Despite extensive studies on the isomer species formed by photodissociation of haloalkanes in solution, the molecular structure of the precursor of the isomer, which is often assumed to be a vibrationally hot isomer formed from the radical pair, and its in-cage isomerization mechanism remain elusive. Here, the structural dynamics of CH2I2 upon 267 nm photoexcitation in methanol were probed with femtosecond X-ray solution scattering at an X-ray free-electron laser. The determined molecular structure of the transiently formed species that converts to the CH2I–I isomer has the I–I distance of 4.17 Å, which is longer than that of the isomer (3.15 Å) by more than 1.0 Å and the mean-squared displacement of 0.45 Å2, which is about 100 times larger than those of typical regular chemical bonds. These unusual structural characteristics are consistent with either a vibrationally hot form of the CH2I–I isomer or the loosely-bound radical pair (CH2I˙⋯I˙). The structural dynamics of in-cage isomerization of CH2I2 and the unusual structure of the loosely-bound isomer precursor were unveiled with femtosecond X-ray liquidography (solution scattering).![]()
Collapse
Affiliation(s)
- Hanui Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea .,KI for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea.,Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS) Daejeon 34141 Republic of Korea
| | - Jong Goo Kim
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS) Daejeon 34141 Republic of Korea
| | - Tae Wu Kim
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS) Daejeon 34141 Republic of Korea
| | - Sang Jin Lee
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea .,KI for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea.,Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS) Daejeon 34141 Republic of Korea
| | - Shunsuke Nozawa
- Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK) Tsukuba Ibaraki 305-0801 Japan.,Department of Materials Structure Science, School of High Energy Accelerator Science, The Graduate University for Advanced Studies Tsukuba Ibaraki 305-0801 Japan
| | - Shin-Ichi Adachi
- Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK) Tsukuba Ibaraki 305-0801 Japan.,Department of Materials Structure Science, School of High Energy Accelerator Science, The Graduate University for Advanced Studies Tsukuba Ibaraki 305-0801 Japan
| | - Kihwan Yoon
- Department of Chemistry, The Catholic University of Korea Bucheon 14662 Republic of Korea
| | - Joonghan Kim
- Department of Chemistry, The Catholic University of Korea Bucheon 14662 Republic of Korea
| | - Hyotcherl Ihee
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea .,KI for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea.,Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS) Daejeon 34141 Republic of Korea
| |
Collapse
|
3
|
Horton SL, Liu Y, Forbes R, Makhija V, Lausten R, Stolow A, Hockett P, Marquetand P, Rozgonyi T, Weinacht T. Excited state dynamics of CH 2I 2 and CH 2BrI studied with UV pump VUV probe photoelectron spectroscopy. J Chem Phys 2019; 150:174201. [PMID: 31067867 DOI: 10.1063/1.5086665] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
We compare the excited state dynamics of diiodomethane (CH2I2) and bromoiodomethane (CH2BrI) using time resolved photoelectron spectroscopy. A 4.65 eV UV pump pulse launches a dissociative wave packet on excited states of both molecules and the ensuing dynamics are probed via photoionization using a 7.75 eV probe pulse. The resulting photoelectrons are measured with the velocity map imaging technique for each pump-probe delay. Our measurements highlight differences in the dynamics for the two molecules, which are interpreted with high-level ab initio molecular dynamics (trajectory surface hopping) calculations. Our analysis allows us to associate features in the photoelectron spectrum with different portions of the excited state wave packet represented by different trajectories. The excited state dynamics in bromoiodomethane are simple and can be described in terms of direct dissociation along the C-I coordinate, whereas the dynamics in diiodomethane involve internal conversion and motion along multiple dimensions.
Collapse
Affiliation(s)
- Spencer L Horton
- Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA
| | - Yusong Liu
- Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA
| | - Ruaridh Forbes
- Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada
| | - Varun Makhija
- Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada
| | - Rune Lausten
- National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada
| | - Albert Stolow
- Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada
| | - Paul Hockett
- National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada
| | - Philipp Marquetand
- Faculty of Chemistry, Institute of Theoretical Chemistry, University of Vienna, Währinger Str. 17, 1090 Wien, Austria
| | - Tamás Rozgonyi
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudósok Körútja 2, Budapest 1117, Hungary
| | - Thomas Weinacht
- Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA
| |
Collapse
|
4
|
Marcellini M, Nasedkin A, Zietz B, Petersson J, Vincent J, Palazzetti F, Malmerberg E, Kong Q, Wulff M, van der Spoel D, Neutze R, Davidsson J. Transient isomers in the photodissociation of bromoiodomethane. J Chem Phys 2018; 148:134307. [PMID: 29626862 DOI: 10.1063/1.5005595] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The photochemistry of halomethanes is fascinating for the complex cascade reactions toward either the parent or newly synthesized molecules. Here, we address the structural rearrangement of photodissociated CH2IBr in methanol and cyclohexane, probed by time-resolved X-ray scattering in liquid solution. Upon selective laser cleavage of the C-I bond, we follow the reaction cascade of the two geminate geometrical isomers, CH2I-Br and CH2Br-I. Both meta-stable isomers decay on different time scales, mediated by solvent interaction, toward the original parent molecule. We observe the internal rearrangement of CH2Br-I to CH2I-Br in cyclohexane by extending the time window up to 3 μs. We track the photoproduct kinetics of CH2Br-I in methanol solution where only one isomer is observed. The effect of the polarity of solvent on the geminate recombination pathways is discussed.
Collapse
Affiliation(s)
- Moreno Marcellini
- Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 462, SE-751 20 Uppsala, Sweden
| | - Alexandr Nasedkin
- Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 462, SE-751 20 Uppsala, Sweden
| | - Burkhard Zietz
- Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 462, SE-751 20 Uppsala, Sweden
| | - Jonas Petersson
- Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 462, SE-751 20 Uppsala, Sweden
| | - Jonathan Vincent
- Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 462, SE-751 20 Uppsala, Sweden
| | - Federico Palazzetti
- Universitá di Perugia, Dipartimento di Chimica, Biologia e Biotecnologie, 06123 Perugia, Italy
| | - Erik Malmerberg
- Department of Chemistry and Molecular Biology, University of Gothenburg, SE-405 30 Gothenburg, Sweden
| | - Qingyu Kong
- Argonne National Laboratory's, Xray Science Division, 9700 S Cass Ave., Argonne, Illinois 60439, USA
| | - Michael Wulff
- European Synchrotron Radiation Facility, B.P. 220, F-380 43 Grenoble Cedex, France
| | - David van der Spoel
- Department of Cell and Molecular Biology, Uppsala University, Husargatan 3, P.O. Box 596, SE-751 24 Uppsala, Sweden
| | - Richard Neutze
- Department of Chemistry and Molecular Biology, University of Gothenburg, SE-405 30 Gothenburg, Sweden
| | - Jan Davidsson
- Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 462, SE-751 20 Uppsala, Sweden
| |
Collapse
|
5
|
Marggi Poullain S, Chicharro DV, Navarro E, Rubio-Lago L, González-Vázquez J, Bañares L. Photodissociation dynamics of bromoiodomethane from the first and second absorption bands. A combined velocity map and slice imaging study. Phys Chem Chem Phys 2018; 20:3490-3503. [PMID: 29335697 DOI: 10.1039/c7cp07077b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ion imaging is applied to disentangle the selective bond cleavage in the photodissociation of bromoiodomethane from the two first absorption bands.
Collapse
Affiliation(s)
- Sonia Marggi Poullain
- Departamento de Qumica Fsica I
- Facultad de Ciencias Qumicas
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - David V. Chicharro
- Departamento de Qumica Fsica I
- Facultad de Ciencias Qumicas
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - Eduardo Navarro
- Departamento de Qumica Fsica I
- Facultad de Ciencias Qumicas
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - Luis Rubio-Lago
- Departamento de Qumica Fsica I
- Facultad de Ciencias Qumicas
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - Jesús González-Vázquez
- Departamento de Qumica
- Módulo 13
- Facultad de Ciencias
- Universidad Autónoma de Madrid
- 28049 Madrid
| | - Luis Bañares
- Departamento de Qumica Fsica I
- Facultad de Ciencias Qumicas
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| |
Collapse
|
6
|
Reid SA. When isomerisation is electron transfer: the intriguing story of the iso-halocarbons. INT REV PHYS CHEM 2014. [DOI: 10.1080/0144235x.2014.942548] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
7
|
Anderson CP, Spears KG, Wilson KR, Sension RJ. Solvent dependent branching between C-I and C-Br bond cleavage following 266 nm excitation of CH2BrI. J Chem Phys 2014; 139:194307. [PMID: 24320326 DOI: 10.1063/1.4829899] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
It is well known that ultraviolet photoexcitation of halomethanes results in halogen-carbon bond cleavage. Each halogen-carbon bond has a dominant ultraviolet (UV) absorption that promotes an electron from a nonbonding halogen orbital (nX) to a carbon-halogen antibonding orbital (σ*C-X). UV absorption into specific transitions in the gas phase results primarily in selective cleavage of the corresponding carbon-halogen bond. In the present work, broadband ultrafast UV-visible transient absorption studies of CH2BrI reveal a more complex photochemistry in solution. Transient absorption spectra are reported spanning the range from 275 nm to 750 nm and 300 fs to 3 ns following excitation of CH2BrI at 266 nm in acetonitrile, 2-butanol, and cyclohexane. Channels involving formation of CH2Br + I radical pairs, iso-CH2Br-I, and iso-CH2I-Br are identified. The solvent environment has a significant influence on the branching ratios, and on the formation and stability of iso-CH2Br-I. Both iso-CH2Br-I and iso-CH2I-Br are observed in cyclohexane with a ratio of ~2.8:1. In acetonitrile this ratio is 7:1 or larger. The observation of formation of iso-CH2I-Br photoproduct as well as iso-CH2Br-I following 266 nm excitation is a novel result that suggests complexity in the dissociation mechanism. We also report a solvent and concentration dependent lifetime of iso-CH2Br-I. At low concentrations the lifetime is >4 ns in acetonitrile, 1.9 ns in 2-butanol and ~1.4 ns in cyclohexane. These lifetimes decrease with higher initial concentrations of CH2BrI. The concentration dependence highlights the role that intermolecular interactions can play in the quenching of unstable isomers of dihalomethanes.
Collapse
Affiliation(s)
- Christopher P Anderson
- Department of Chemistry and Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | | | | | | |
Collapse
|
8
|
Pal SK, Mereshchenko AS, Butaeva EV, El-Khoury PZ, Tarnovsky AN. Global sampling of the photochemical reaction paths of bromoform by ultrafast deep-UV through near-IR transient absorption and ab initio multiconfigurational calculations. J Chem Phys 2013; 138:124501. [DOI: 10.1063/1.4789268] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
9
|
Butaeva EV, Mereshchenko AS, Panov MS, Tarnovsky AN. Ultrafast One-Photon (232 vs 266 nm) Bond-Selective Photochemistry of Bromoiodomethane (CH2BrI) in Solution. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20134105012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|