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Zhang J, Peng J, Hu D, Lan Z. Investigation of nonadiabatic dynamics in the photolysis of methyl nitrate (CH 3ONO 2) by on-the-fly surface hopping simulation. Phys Chem Chem Phys 2021; 23:25597-25611. [PMID: 34546246 DOI: 10.1039/d1cp03226g] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photolysis mechanism of methyl nitrate (CH3ONO2) was studied using the on-the-fly surface hopping dynamics at the XMS-CASPT2 level. Several critical geometries, including electronic state minima and conical intersections, were obtained, which play essential roles in the nonadiabatic dynamics of CH3ONO2. The ultrafast nonadiabatic decay dynamics to the ground state were simulated, which gives a proper explanation on the broad and structureless absorption spectra of CH3ONO2. The photodissociation channels, including CH3O + NO2, CH3O + NO + O, and others, as well as their branching ratios, were identified. When the dynamics starts from the lowest two electronic states (S1 and S2), the CH3O + NO2 channel is the dominant photolysis pathway, although we observed the minor contributions of other channels. In contrast, when the trajectories start from the third excited state S3, both CH3O + NO2 and CH3O + NO + O channels become important. Here the CH3O-NO2 bond dissociation takes place first, and then for some trajectories, the N-O bond of the NO2 part breaks successively. The quasi-degeneracy of electronic states may exist in the dissociation limits of both CH3O + NO2 and CH3O + NO + O channels. The current work provides valuable information in the understanding of experimental findings of the wavelength-dependent photolysis mechanism of CH3ONO2.
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Affiliation(s)
- Juanjuan Zhang
- SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Environmental Theoretical Chemistry, South China Normal University, Guangzhou 510006, China. .,School of Environment, South China Normal University, Guangzhou 510006, China
| | - Jiawei Peng
- SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Environmental Theoretical Chemistry, South China Normal University, Guangzhou 510006, China. .,School of Environment, South China Normal University, Guangzhou 510006, China
| | - Deping Hu
- SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Environmental Theoretical Chemistry, South China Normal University, Guangzhou 510006, China. .,School of Environment, South China Normal University, Guangzhou 510006, China
| | - Zhenggang Lan
- SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Environmental Theoretical Chemistry, South China Normal University, Guangzhou 510006, China. .,School of Environment, South China Normal University, Guangzhou 510006, China
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2
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Titov E, Hummert J, Ikonnikov E, Mitrić R, Kornilov O. Electronic relaxation of aqueous aminoazobenzenes studied by time-resolved photoelectron spectroscopy and surface hopping TDDFT dynamics calculations. Faraday Discuss 2021; 228:226-241. [PMID: 33586720 DOI: 10.1039/d0fd00111b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Studies of ultrafast relaxation of molecular chromophores are complicated by the fact that most chromophores of biological and technological importance are rather large molecules and are strongly affected by their environment, either solvent or a protein cage. Here we present an approach which allows us to follow transient electronic structure of complex photoexcited molecules. We use the method of time-resolved photoelectron spectroscopy in solution to follow relaxation of two prototypical aqueous chromophores, Methyl Orange and Metanil Yellow, both of which are aminoazobenzene derivatives. Using excitation by 400 nm laser pulses and ionization by wavelength-selected 46.7 nm XUV pulses from high-order harmonic generation we follow relaxation of both molecules via the dark S1 state. The photoelectron spectra yield binding energies of both ground and excited states. We combine the experimental results with surface hopping time-dependent density functional theory (TDDFT) calculations employing B3LYP+D3 and ωB97X-D functionals. The results demonstrate that the method is generally suitable for description of ultrafast dynamics in these molecules and can recover absolute binding energies observed in the experiment. The B3LYP+D3 functional appears to be better suited for these systems, especially in the case of Metanil Yellow, where it indicates the importance of an intramolecular charge transfer state. Our results pave the way towards quantitative understanding of evolving electronic structure in photo-induced relaxation processes.
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Affiliation(s)
- Evgenii Titov
- Institut für Physikalische und Theoretische Chemie, Julius-Maximilians-Universität Würzburg, Emil-Fischer-Straße 42, 97074 Würzburg, Germany.
| | - Johan Hummert
- Max Born Institute, Max-Born-Straße 2A, 12489 Berlin, Germany.
| | | | - Roland Mitrić
- Institut für Physikalische und Theoretische Chemie, Julius-Maximilians-Universität Würzburg, Emil-Fischer-Straße 42, 97074 Würzburg, Germany.
| | - Oleg Kornilov
- Max Born Institute, Max-Born-Straße 2A, 12489 Berlin, Germany.
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3
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Mališ M, Luber S. Trajectory Surface Hopping Nonadiabatic Molecular Dynamics with Kohn–Sham ΔSCF for Condensed-Phase Systems. J Chem Theory Comput 2020; 16:4071-4086. [DOI: 10.1021/acs.jctc.0c00372] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Momir Mališ
- University of Zurich, Department of Chemistry, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - Sandra Luber
- University of Zurich, Department of Chemistry, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
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Peng J, Xie Y, Hu D, Lan Z. Performance of trajectory surface hopping method in the treatment of ultrafast intersystem crossing dynamics. J Chem Phys 2019; 150:164126. [PMID: 31042919 DOI: 10.1063/1.5079426] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We carried out extensive studies to examine the performance of the fewest-switches surface hopping method in the description of the ultrafast intersystem crossing dynamic of various singlet-triplet (S-T) models by comparison with the results of the exact full quantum dynamics. Different implementation details and some derivative approaches were examined. As expected, it is better to perform the trajectory surface hopping calculations in the spin-adiabatic representation or by the local diabatization approach, instead of in the spin-diabatic representation. The surface hopping method provides reasonable results for the short-time dynamics in the S-T model with weak spin-orbital coupling (diabatic coupling), although it does not perform well in the models with strong spin-orbital coupling (diabatic coupling). When the system accesses the S-T potential energy crossing with rather high kinetic energy, the trajectory surface hopping method tends to produce a good description of the nonadiabatic intersystem crossing dynamics. The impact of the decoherence correction on the performance of the trajectory surface hopping is system dependent. It improves the result accuracy in many cases, while its influence may also be minor for other cases.
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Affiliation(s)
- Jiawei Peng
- Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety and MOE Key Laboratory of Environmental Theoretical Chemistry, SCNU Environmental Research Institute, South China Normal University, Guangzhou 510006, China
| | - Yu Xie
- Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety and MOE Key Laboratory of Environmental Theoretical Chemistry, SCNU Environmental Research Institute, South China Normal University, Guangzhou 510006, China
| | - Deping Hu
- MOE Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Zhenggang Lan
- Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety and MOE Key Laboratory of Environmental Theoretical Chemistry, SCNU Environmental Research Institute, South China Normal University, Guangzhou 510006, China
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5
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Suchan J, Hollas D, Curchod BFE, Slavíček P. On the importance of initial conditions for excited-state dynamics. Faraday Discuss 2018; 212:307-330. [DOI: 10.1039/c8fd00088c] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The vast majority of ab initio excited-state simulations are performed within semiclassical, trajectory-based approaches. Apart from the underlying electronic-structure theory, the reliability of the simulations is controlled by a selection of initial conditions for the classical trajectories. We discuss appropriate choices of initial conditions for simulations of different experimental arrangements: dynamics initiated by continuum-wave (CW) laser fields or triggered by ultrashort laser pulses.
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Affiliation(s)
- Jiří Suchan
- Department of Physical Chemistry
- University of Chemistry and Technology, Prague
- 16628 Prague
- Czech Republic
| | - Daniel Hollas
- Department of Physical Chemistry
- University of Chemistry and Technology, Prague
- 16628 Prague
- Czech Republic
| | | | - Petr Slavíček
- Department of Physical Chemistry
- University of Chemistry and Technology, Prague
- 16628 Prague
- Czech Republic
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Du L, Lan Z. An On-the-Fly Surface-Hopping Program JADE for Nonadiabatic Molecular Dynamics of Polyatomic Systems: Implementation and Applications. J Chem Theory Comput 2016; 11:1360-74. [PMID: 26574348 DOI: 10.1021/ct501106d] [Citation(s) in RCA: 89] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Nonadiabatic dynamics simulations have rapidly become an indispensable tool for understanding ultrafast photochemical processes in complex systems. Here, we present our recently developed on-the-fly nonadiabatic dynamics package, JADE, which allows researchers to perform nonadiabatic excited-state dynamics simulations of polyatomic systems at an all-atomic level. The nonadiabatic dynamics is based on Tully's surface-hopping approach. Currently, several electronic structure methods (CIS, TDHF, TDDFT(RPA/TDA), and ADC(2)) are supported, especially TDDFT, aiming at performing nonadiabatic dynamics on medium- to large-sized molecules. The JADE package has been interfaced with several quantum chemistry codes, including Turbomole, Gaussian, and Gamess (US). To consider environmental effects, the Langevin dynamics was introduced as an easy-to-use scheme into the standard surface-hopping dynamics. The JADE package is mainly written in Fortran for greater numerical performance and Python for flexible interface construction, with the intent of providing open-source, easy-to-use, well-modularized, and intuitive software in the field of simulations of photochemical and photophysical processes. To illustrate the possible applications of the JADE package, we present a few applications of excited-state dynamics for various polyatomic systems, such as the methaniminium cation, fullerene (C20), p-dimethylaminobenzonitrile (DMABN) and its primary amino derivative aminobenzonitrile (ABN), and 10-hydroxybenzo[h]quinoline (10-HBQ).
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Affiliation(s)
- Likai Du
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , Qingdao, 266101 Shandong, People's Republic of China.,University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China.,The Qingdao Key Lab of Solar Energy Utilization and Energy Storage Technology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , Qingdao, 266101 Shandong, People's Republic of China
| | - Zhenggang Lan
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , Qingdao, 266101 Shandong, People's Republic of China.,University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China.,The Qingdao Key Lab of Solar Energy Utilization and Energy Storage Technology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , Qingdao, 266101 Shandong, People's Republic of China
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7
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Malhado JP, Bearpark MJ, Hynes JT. Non-adiabatic dynamics close to conical intersections and the surface hopping perspective. Front Chem 2014; 2:97. [PMID: 25485263 PMCID: PMC4240175 DOI: 10.3389/fchem.2014.00097] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Accepted: 10/16/2014] [Indexed: 11/13/2022] Open
Abstract
Conical intersections play a major role in the current understanding of electronic de-excitation in polyatomic molecules, and thus in the description of photochemistry and photophysics of molecular systems. This article reviews aspects of the basic theory underlying the description of non-adiabatic transitions at conical intersections, with particular emphasis on the important case when the dynamics of the nuclei are treated classically. Within this classical nuclear motion framework, the main aspects of the surface hopping methodology in the conical intersection context are presented. The emerging picture from this treatment is that of electronic transitions around conical intersections dominated by the interplay of the nuclear velocity and the derivative non-adiabatic coupling vector field.
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Affiliation(s)
| | | | - James T Hynes
- Department of Chemistry and Biochemistry, University of Colorado, Boulder Boulder, CO, USA ; Département de Chimie, École Normale Supérieur, UMR ENS-CNRS-UPMC 8640 Paris, France
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8
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An overview of nonadiabatic dynamics simulations methods, with focus on the direct approach versus the fitting of potential energy surfaces. Theor Chem Acc 2014. [DOI: 10.1007/s00214-014-1526-1] [Citation(s) in RCA: 102] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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9
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Carstensen NO. QM/MM surface-hopping dynamics of a bridged azobenzene derivative. Phys Chem Chem Phys 2013; 15:15017-26. [DOI: 10.1039/c3cp50606a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Ruzi M, Anderson DT. Photodissociation of N-methylformamide isolated in solid parahydrogen. J Chem Phys 2012. [DOI: 10.1063/1.4765372] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Nonadiabatic dynamics with trajectory surface hopping method. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2011. [DOI: 10.1002/wcms.64] [Citation(s) in RCA: 279] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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Cusati T, Granucci G, Persico M. Photodynamics and Time-Resolved Fluorescence of Azobenzene in Solution: A Mixed Quantum-Classical Simulation. J Am Chem Soc 2011; 133:5109-23. [DOI: 10.1021/ja1113529] [Citation(s) in RCA: 126] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Teresa Cusati
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, v. Risorgimento 35, I-56126 Pisa, Italy
| | - Giovanni Granucci
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, v. Risorgimento 35, I-56126 Pisa, Italy
| | - Maurizio Persico
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, v. Risorgimento 35, I-56126 Pisa, Italy
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13
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Malhado JP, Spezia R, Hynes JT. Dynamical Friction Effects on the Photoisomerization of a Model Protonated Schiff Base in Solution. J Phys Chem A 2010; 115:3720-35. [DOI: 10.1021/jp106096m] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- João Pedro Malhado
- Département de Chimie, CNRS UMR 8640 PASTEUR, École Normale Supérieure, 24 rue Lhomond, 75005 Paris, France
| | - Riccardo Spezia
- Laboratoire Analyse et Modélisation pour la Biologie et l’Environement, CNRS UMR 8587, Université d’Evry Val d’Essonne, Bd. F. Mitterrand, 91025 Evry, France
| | - James T. Hynes
- Département de Chimie, CNRS UMR 8640 PASTEUR, École Normale Supérieure, 24 rue Lhomond, 75005 Paris, France
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, United States
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14
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Malhado JP, Hynes JT. On the Landau–Zener approach to nonadiabatic transitions for a vertical conical intersection. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2007.11.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Shipman ST, Douglass PC, Yoo HS, Hinkle CE, Mierzejewski EL, Pate BH. Vibrational dynamics of carboxylic acid dimers in gas and dilute solution. Phys Chem Chem Phys 2007; 9:4572-86. [PMID: 17690783 DOI: 10.1039/b704900e] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Ultrafast mid-IR transient absorption spectroscopy has been used to study the vibrational dynamics of hydrogen-bonded cyclic dimers of trifluoroacetic acid and formic acid in both the gas and solution phases (0.05 M in CCl(4)). Ultrafast excitation of the broad O-H cyclic dimer band leads, in the gas phase, to large-scale structural changes of the dimer creating a species with a distinct free O-H stretching band on 20 ps and 200 ps timescales. These timescales are assigned to ring-opening and dissociation of the dimer, respectively. In the solution phase, no such structural rearrangement occurs and our results are consistent with previous studies. The gas phase dynamics are insensitive to both the specific excitation energy (over a span of 550 cm(-1)) and the chemical identity of the dimer.
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Affiliation(s)
- Steven T Shipman
- Department of Chemistry, University of Virginia, Charlottesville, VA 22904, USA
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16
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Laage D, Burghardt I, Sommerfeld T, Hynes JT. On the Dissociation of Aromatic Radical Anions in Solution. 1. Formulation and Application to p-Cyanochlorobenzene Radical Anion. J Phys Chem A 2003. [DOI: 10.1021/jp035637u] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Damien Laage
- Département de Chimie, CNRS UMR 8640 PASTEUR, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France, Département de Chimie, CNRS UMR 8642, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France, Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215
| | - Irene Burghardt
- Département de Chimie, CNRS UMR 8640 PASTEUR, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France, Département de Chimie, CNRS UMR 8642, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France, Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215
| | - Thomas Sommerfeld
- Département de Chimie, CNRS UMR 8640 PASTEUR, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France, Département de Chimie, CNRS UMR 8642, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France, Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215
| | - James T. Hynes
- Département de Chimie, CNRS UMR 8640 PASTEUR, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France, Département de Chimie, CNRS UMR 8642, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France, Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215
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17
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Diau EWG, Zewail AH. Femtochemistry of trans-azomethane: a combined experimental and theoretical study. Chemphyschem 2003; 4:445-56. [PMID: 12785258 DOI: 10.1002/cphc.200200579] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The dissociation dynamics of trans-azomethane upon excitation to the S,(n, pi) state with a total energy of 93 kcalmol-1 is investigated using femtosecond-resolved mass spectrometry in a molecular beam. The transient signal shows an opposite pump-probe excitation feature for the UV (307 nm) and the visible (615 nm) pulses at the perpendicular polarization in comparison with the signal obtained at the parallel polarization: The one-photon symmetry-forbidden process excited by the UV pulse is dominant at the perpendicular polarization, whereas the two-photon symmetry-allowed process initiated by the visible pulse prevails at the parallel polarization. At the perpendicular polarization, we found that the two C-N bonds of the molecule break in a stepwise manner, that is, the first C-N bond breaks in approximately 70 fs followed by the second one in approximately 100 fs, with the intermediate characterized. At the parallel polarization, the first C-N bond cleavage was found to occur in 100 fs with the intensity of the symmetry-allowed transition being one order of magnitude greater than the intensity of the symmetry-forbidden transition at the perpendicular polarization. Theoretical calculations using time-dependent density functional theory (TDDFT) and the complete active space self-consistent field (CASSCF) method have been carried out to characterize the potential energy surface for the ground state, the low-lying excited states, and the cationic ground state at various levels of theory. Combining the experimental and theoretical results, we identified the elementary steps in the mechanism. The initial driving force of the ultrafast bond-breaking process of trans-azomethane (at the perpendicular polarization) is due to the CNNC torsional motion initiated by the vibronic coupling through an intensity-borrowing mechanism for the symmetry-forbidden n-pi transition. Following this torsional motion and the associated molecular symmetry breaking, an S0/S1 conical intersection (CI) can be reached at a torsional angle of 93.1 degrees (predicted at the CASSCF(8.7)/cc-pVDZ level of theory). Funneling through the S0/S1, CI could activate the asymmetric C-N stretching motion, which is the key motion for the consecutive C-N bond breakages on the femtosecond time scale.
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Affiliation(s)
- Eric W G Diau
- Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, USA.
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18
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19
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Laage D, Burghardt I, Sommerfeld T, Hynes JT. On the dissociation of aromatic radical anions in solution. Chemphyschem 2003; 4:61-6. [PMID: 12596466 DOI: 10.1002/cphc.200390009] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A new theoretical formulation is given for the reaction rate and path for the important reaction class of aromatic radical anion dissociation in solution [Ar-X]-.-->Ar. + X-, and is illustrated for the case of the cyanochlorobenzene radical anion [CN-phi-CI]-. in dimethylformamide. Among the theory's novel features is the inclusion of the conical intersection aspect of this ground electronic state problem, which is key in allowing the reaction to occur and which has a significant impact on the reaction barrier height. Reasonable agreement with the experimental rate is found.
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Affiliation(s)
- Damien Laage
- Département de Chimie CNRS UMR 8640 PASTEUR Ecole Normale Supérieure, 24 rue Lhomond 75231 Paris, France
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20
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Brede O, Hermann R, Naumann W, Naumov S. Monitoring of the Heterogroup Twisting Dynamics in Phenol Type Molecules via Different Characteristic Free-Electron-Transfer Products. J Phys Chem A 2002. [DOI: 10.1021/jp013334z] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ortwin Brede
- Interdisciplinary Group for Time-Resolved Spectroscopy, University of Leipzig, Permoserstrasse 15, D-04303 Leipzig, Germany, and Institute of Surface Modification, D-04303 Leipzig, Germany
| | - Ralf Hermann
- Interdisciplinary Group for Time-Resolved Spectroscopy, University of Leipzig, Permoserstrasse 15, D-04303 Leipzig, Germany, and Institute of Surface Modification, D-04303 Leipzig, Germany
| | - Wolfgang Naumann
- Interdisciplinary Group for Time-Resolved Spectroscopy, University of Leipzig, Permoserstrasse 15, D-04303 Leipzig, Germany, and Institute of Surface Modification, D-04303 Leipzig, Germany
| | - Sergej Naumov
- Interdisciplinary Group for Time-Resolved Spectroscopy, University of Leipzig, Permoserstrasse 15, D-04303 Leipzig, Germany, and Institute of Surface Modification, D-04303 Leipzig, Germany
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21
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Cattaneo P, Persico M. Semiclassical simulations of azomethane photochemistry in the gas phase and in solution. J Am Chem Soc 2001; 123:7638-45. [PMID: 11480986 DOI: 10.1021/ja0102843] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
We present semiclassical simulations of the dynamical events which follow the n --> pi excitation of an azomethane molecule: decay to the ground state, isomerization, and dissociation. Ab initio potential energy surfaces and couplings, slightly modified according to available experimental data, are employed in conjunction with a trajectory-surface-hopping method. For an isolated molecule, we show that dissociation takes place in the ground state, because the radiationless decay is very fast. The dissociation is mainly sequential: the methyldiazenyl radical first produced fragmentates very rapidly to N(2) + CH(3)*. The results of previous experiments by Lee's and Zewail's groups, from which partially conflicting conclusions had been drawn, are reproduced and interpreted. Molecular dynamics, coupled to the surface-hopping algorithm, allows us to simulate the photochemistry in acqueous solution. Here the fragmentation is suppressed because of vibrational energy loss to the solvent: only the isomerization takes place.
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Affiliation(s)
- P Cattaneo
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, I-56126 Pisa, Italy
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22
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Granucci G, Persico M, Toniolo A. Direct semiclassical simulation of photochemical processes with semiempirical wave functions. J Chem Phys 2001. [DOI: 10.1063/1.1376633] [Citation(s) in RCA: 320] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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23
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Granucci G, Hynes JT, Millié P, Tran-Thi TH. A Theoretical Investigation of Excited-State Acidity of Phenol and Cyanophenols. J Am Chem Soc 2000. [DOI: 10.1021/ja993730j] [Citation(s) in RCA: 131] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Giovanni Granucci
- Contribution from CEA Saclay, DSM/DRECAM/SPAM, Bât. 522, 91191 Gif sur Yvette, France, Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and Département de Chimie, CNRS UMR 8640, École Normale Supérieure, 24 rue Lhomond, 75231 Paris, France
| | - James T. Hynes
- Contribution from CEA Saclay, DSM/DRECAM/SPAM, Bât. 522, 91191 Gif sur Yvette, France, Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and Département de Chimie, CNRS UMR 8640, École Normale Supérieure, 24 rue Lhomond, 75231 Paris, France
| | - Philippe Millié
- Contribution from CEA Saclay, DSM/DRECAM/SPAM, Bât. 522, 91191 Gif sur Yvette, France, Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and Département de Chimie, CNRS UMR 8640, École Normale Supérieure, 24 rue Lhomond, 75231 Paris, France
| | - Thu-Hoa Tran-Thi
- Contribution from CEA Saclay, DSM/DRECAM/SPAM, Bât. 522, 91191 Gif sur Yvette, France, Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and Département de Chimie, CNRS UMR 8640, École Normale Supérieure, 24 rue Lhomond, 75231 Paris, France
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Cattaneo P, Persico M, Tani A. Nonadiabatic processes in solution: molecular dynamics and surface hopping. Chem Phys 1999. [DOI: 10.1016/s0301-0104(99)00191-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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