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Mansour R, Toldo JM, Mukherjee S, Pinheiro M, Barbatti M. Temperature effects on the internal conversion of excited adenine and adenosine. Phys Chem Chem Phys 2023; 25:27083-27093. [PMID: 37801041 PMCID: PMC10583498 DOI: 10.1039/d3cp03234e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Accepted: 09/09/2023] [Indexed: 10/07/2023]
Abstract
This work aims to elucidate the dependence of the excited-state lifetime of adenine and adenosine on temperature. So far, it has been experimentally shown that while adenine's lifetime is unaffected by temperature, adenosine's lifetime strongly depends on it. However, the non-Arrhenius temperature dependence has posed a challenge in explaining this phenomenon. We used surface hopping to simulate the dynamics of adenine and adenosine in the gas phase at 0 and 400 K. The temperature effects were observed under the initial conditions via Wigner sampling with thermal corrections. Our results confirm that adenine's excited-state lifetime does not depend on temperature, while adenosine's lifetime does. Adenosine's dependency is due to intramolecular vibrational energy transfer from adenine to the ribose group. At 0 K, this transfer reduced the mean kinetic energy of adenine's moiety so much that internal conversion is inhibited, and the lifetime elongated by a factor of 2.3 compared to that at 400 K. The modeling also definitively ruled out the influence of viscosity, which was proposed as an alternative explanation previously.
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Affiliation(s)
- Ritam Mansour
- Aix Marseille University, CNRS, ICR, Marseille, France.
| | | | | | - Max Pinheiro
- Aix Marseille University, CNRS, ICR, Marseille, France.
| | - Mario Barbatti
- Aix Marseille University, CNRS, ICR, Marseille, France.
- Institut Universitaire de France, 75231, Paris, France
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Mandal M, Rajak K, Maiti B. Mechanistic Insight and Intersystem Crossing Dynamics of the C( 3P) + H 2CO/D 2CO Reaction. J Phys Chem A 2023. [PMID: 37209129 DOI: 10.1021/acs.jpca.3c01480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The reaction of atomic carbon, C(3P), with H2CO has been investigated using the direct dynamics trajectory surface hopping (DDTSH) method with Tully's fewest switches algorithm. The lowest lying ground triplet and single states are considered for the dynamics study at a reagent collision energy of 8.0 kcal/mol. From the trajectory calculations, we observed that CH2 + CO and H + HCCO are the two major product channels for the title reaction. The insertion mechanism of the C(3P) + H2CO reaction is rather complex and is followed by three distinct intermediates with no entrance channel barrier to the reaction on the B3LYP/6-31G(d,p) potential energy surfaces. The triplet insertion complexes are formed by three different approaches; "Sideways", "End-on" and "Head-on" attack of the triplet carbon atom toward H2CO molecule. Our dynamics calculations predict a new product channel (H + HCCO(X 2A'')) with a contribution of ∼46% of the overall products formation via ketocarbene intermediate through "Head-on" approach. Despite the weak spin-orbit coupling (SOC) interactions, intersystem crossing (ISC) via a ketocarbene intermediate has a small but significant contribution, about 2.3%, for the CH2 + CO channel. To understand the kinetic isotope effects on the reaction dynamics, we have extended our study for the C(3P) + D2CO reaction. It is seen that isotopic substitution of both the H atoms has a small reduction in the extent of ISC dynamics for the carbene formation. Our results, certainly, reveal the importance of the ketocarbene intermediate and the H + HCCO products channel as one of the major product formation channels in the title reaction, which was not reported earlier.
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Affiliation(s)
- Mrinmoy Mandal
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Karunamoy Rajak
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Biswajit Maiti
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
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Tsuru S, Sharma B, Marx D, Hättig C. Structural Sampling and Solvation Models for the Simulation of Electronic Spectra: Pyrazine as a Case Study. J Chem Theory Comput 2023; 19:2291-2303. [PMID: 36971352 DOI: 10.1021/acs.jctc.2c01129] [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
The impact of sampling methods on spectral broadening in the gas phase and on the convergence of spectra in aqueous solution when using microsolvation, continuum solvation, and hybrid models is studied using pyrazine as a test case. For the sake of comparing classical Maxwell-Boltzmann and Wigner samplings in the gas phase, static and time-resolved X-ray absorption spectra after photoexcitation to the lowest 1B2u(ππ*) state, as well as the static UV-vis absorption spectrum, are considered. In addition, the UV-vis absorption spectrum of pyrazine in aqueous solution is also computed in order to systematically investigate its convergence with the number of explicitly included solvent shells with and without taking bulk solvation effects into account with the conductor-like screening model to represent implicit water beyond such explicit solute complexes. Concerning the static and time-resolved X-ray absorption spectra of pyrazine at the carbon K-edge as well as its UV-vis absorption spectrum in the gas phase, we find that these spectra obtained with Wigner and Maxwell-Boltzmann samplings substantially agree. For the UV-vis absorption spectrum in the aqueous solution, only the first two energetically low-lying bands converge quickly with the size of the explicitly included solvation shells, either with or without an additional continuum solvation taken into account. In stark contrast, calculations of the higher-lying excitations relying on finite microsolvated clusters without additional continuum solvation severely suffer from unphysical charge-transfer excitations into Rydberg-like orbitals at the cluster/vacuum interface. This finding indicates that computational UV-vis absorption spectra covering sufficiently high-lying states converge only if continuum solvation of the explicitly microsolvated solutes is included in the models.
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Barbatti M, Bondanza M, Crespo-Otero R, Demoulin B, Dral PO, Granucci G, Kossoski F, Lischka H, Mennucci B, Mukherjee S, Pederzoli M, Persico M, Pinheiro M, Pittner J, Plasser F, Sangiogo Gil E, Stojanovic L. Newton-X Platform: New Software Developments for Surface Hopping and Nuclear Ensembles. J Chem Theory Comput 2022; 18:6851-6865. [PMID: 36194696 PMCID: PMC9648185 DOI: 10.1021/acs.jctc.2c00804] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
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Newton-X is an open-source computational platform to
perform nonadiabatic
molecular dynamics based on surface hopping and spectrum simulations
using the nuclear ensemble approach. Both are among the most common
methodologies in computational chemistry for photophysical and photochemical
investigations. This paper describes the main features of these methods
and how they are implemented in Newton-X. It emphasizes the newest
developments, including zero-point-energy leakage correction, dynamics
on complex-valued potential energy surfaces, dynamics induced by incoherent
light, dynamics based on machine-learning potentials, exciton dynamics
of multiple chromophores, and supervised and unsupervised machine
learning techniques. Newton-X is interfaced with several third-party
quantum-chemistry programs, spanning a broad spectrum of electronic
structure methods.
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Affiliation(s)
- Mario Barbatti
- Aix Marseille University, CNRS, ICR, 13013Marseille, France.,Institut Universitaire de France, 75231Paris, France
| | - Mattia Bondanza
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Moruzzi 13, 56124Pisa, Italy
| | - Rachel Crespo-Otero
- Department of Chemistry, Queen Mary University of London, Mile End Road, E1 4NSLondon, U.K
| | | | - Pavlo O Dral
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Department of Chemistry, and College of Chemistry and Chemical Engineering, Xiamen University, 361005Xiamen, China
| | - Giovanni Granucci
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Moruzzi 13, 56124Pisa, Italy
| | - Fábris Kossoski
- Laboratoire de Chimie et Physique Quantiques (UMR 5626), Université de Toulouse, CNRS, UPS, 31000Toulouse, France
| | - Hans Lischka
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas79409, United States
| | - Benedetta Mennucci
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Moruzzi 13, 56124Pisa, Italy
| | | | - Marek Pederzoli
- J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Dolejškova 3, 18223Prague 8, Czech Republic
| | - Maurizio Persico
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Moruzzi 13, 56124Pisa, Italy
| | - Max Pinheiro
- Aix Marseille University, CNRS, ICR, 13013Marseille, France
| | - Jiří Pittner
- J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Dolejškova 3, 18223Prague 8, Czech Republic
| | - Felix Plasser
- Department of Chemistry, Loughborough University, LE11 3TULoughborough, U.K
| | - Eduarda Sangiogo Gil
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Moruzzi 13, 56124Pisa, Italy
| | - Ljiljana Stojanovic
- Department of Physics and Astronomy, University College London, Gower Street, WC1E 6BTLondon, U.K
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Avagliano D, Lorini E, González L. Sampling effects in quantum mechanical/molecular mechanics trajectory surface hopping non-adiabatic dynamics. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2022; 380:20200381. [PMID: 35341304 PMCID: PMC8958275 DOI: 10.1098/rsta.2020.0381] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 09/01/2021] [Indexed: 05/29/2023]
Abstract
The impact of different initial conditions in non-adiabatic trajectory surface hopping dynamics within a hybrid quantum mechanical/molecular mechanics scheme is investigated. The influence of a quantum sampling, based on a Wigner distribution, a fully thermal sampling, based on classical molecular dynamics, and a quantum sampled system, but thermally equilibrated with the environment, is investigated on the relaxation dynamics of solvated fulvene after light irradiation. We find that the decay from the first singlet excited state to the ground state shows high dependency on the initial condition and simulation parameters. The three sampling methods lead to different distributions of initial geometries and momenta, which then affect the fate of the excited state dynamics. We evaluated both the effect of sampling geometries and momenta, analysing how the ultrafast decay of fulvene changes accordingly. The results are expected to be of interest to decide how to initialize non-adiabatic dynamics in the presence of the environment. This article is part of the theme issue 'Chemistry without the Born-Oppenheimer approximation'.
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Affiliation(s)
- Davide Avagliano
- Faculty of Chemistry, Institute of Theoretical Chemistry, University of Vienna, Währinger Straße 17, A-1180 Vienna, Austria
| | - Emilio Lorini
- Faculty of Chemistry, Institute of Theoretical Chemistry, University of Vienna, Währinger Straße 17, A-1180 Vienna, Austria
| | - Leticia González
- Faculty of Chemistry, Institute of Theoretical Chemistry, University of Vienna, Währinger Straße 17, A-1180 Vienna, Austria
- Vienna Research Platform on Accelerating Photoreaction Discovery, University of Vienna, Währinger Straße 17, A-1180 Vienna, Austria
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