1
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Jana S, Herbert JM. Fractional-Electron and Transition-Potential Methods for Core-to-Valence Excitation Energies Using Density Functional Theory. J Chem Theory Comput 2023; 19:4100-4113. [PMID: 37312236 DOI: 10.1021/acs.jctc.3c00202] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Methods for computing X-ray absorption spectra based on a constrained core hole (possibly containing a fractional electron) are examined. These methods are based on Slater's transition concept and its generalizations, wherein core-to-valence excitation energies are determined using Kohn-Sham orbital energies. Methods examined here avoid promoting electrons beyond the lowest unoccupied molecular orbital, facilitating robust convergence. Variants of these ideas are systematically tested, revealing a best-case accuracy of 0.3-0.4 eV (with respect to experiment) for K-edge transition energies. Absolute errors are much larger for higher-lying near-edge transitions but can be reduced below 1 eV by introducing an empirical shift based on a charge-neutral transition-potential method, in conjunction with functionals such as SCAN, SCAN0, or B3LYP. This procedure affords an entire excitation spectrum from a single fractional-electron calculation, at the cost of ground-state density functional theory and without the need for state-by-state calculations. This shifted transition-potential approach may be especially useful for simulating transient spectroscopies or in complex systems where excited-state Kohn-Sham calculations are challenging.
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Affiliation(s)
- Subrata Jana
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - John M Herbert
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
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2
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Katayama T, Choi TK, Khakhulin D, Dohn AO, Milne CJ, Vankó G, Németh Z, Lima FA, Szlachetko J, Sato T, Nozawa S, Adachi SI, Yabashi M, Penfold TJ, Gawelda W, Levi G. Atomic-scale observation of solvent reorganization influencing photoinduced structural dynamics in a copper complex photosensitizer. Chem Sci 2023; 14:2572-2584. [PMID: 36908966 PMCID: PMC9993854 DOI: 10.1039/d2sc06600a] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 01/30/2023] [Indexed: 02/04/2023] Open
Abstract
Photochemical reactions in solution are governed by a complex interplay between transient intramolecular electronic and nuclear structural changes and accompanying solvent rearrangements. State-of-the-art time-resolved X-ray solution scattering has emerged in the last decade as a powerful technique to observe solute and solvent motions in real time. However, disentangling solute and solvent dynamics and how they mutually influence each other remains challenging. Here, we simultaneously measure femtosecond X-ray emission and scattering to track both the intramolecular and solvation structural dynamics following photoexcitation of a solvated copper photosensitizer. Quantitative analysis assisted by molecular dynamics simulations reveals a two-step ligand flattening strongly coupled to the solvent reorganization, which conventional optical methods could not discern. First, a ballistic flattening triggers coherent motions of surrounding acetonitrile molecules. In turn, the approach of acetonitrile molecules to the copper atom mediates the decay of intramolecular coherent vibrations and induces a further ligand flattening. These direct structural insights reveal that photoinduced solute and solvent motions can be intimately intertwined, explaining how the key initial steps of light harvesting are affected by the solvent on the atomic time and length scale. Ultimately, this work takes a step forward in understanding the microscopic mechanisms of the bidirectional influence between transient solvent reorganization and photoinduced solute structural dynamics.
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Affiliation(s)
- Tetsuo Katayama
- Japan Synchrotron Radiation Research Institute Kouto 1-1-1, Sayo Hyogo 679-5198 Japan.,RIKEN SPring-8 Center 1-1-1 Kouto, Sayo Hyogo 679-5148 Japan
| | - Tae-Kyu Choi
- XFEL Division, Pohang Accelerator Laboratory Jigok-ro 127-80 Pohang 37673 Republic of Korea
| | | | - Asmus O Dohn
- Science Institute, University of Iceland 107 Reykjavík Iceland .,DTU Physics, Technical University of Denmark Kongens Lyngby Denmark
| | | | - György Vankó
- Wigner Research Centre for Physics, Hungarian Academy of Sciences H-1525 Budapest Hungary
| | - Zoltán Németh
- Wigner Research Centre for Physics, Hungarian Academy of Sciences H-1525 Budapest Hungary
| | | | - Jakub Szlachetko
- SOLARIS National Synchrotron Radiation Centre, Jagiellonian University PL-30392 Kraków Poland
| | - Tokushi Sato
- European XFEL Holzkoppel 4, Schenefeld 22869 Germany
| | - Shunsuke Nozawa
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK) 1-1 Oho Tsukuba Ibaraki 305-0801 Japan.,Department of Materials Structure Science, School of High Energy Accelerator Science, The Graduate University for Advanced Studies 1-1 Oho Tsukuba Ibaraki 305-0801 Japan
| | - Shin-Ichi Adachi
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK) 1-1 Oho Tsukuba Ibaraki 305-0801 Japan.,Department of Materials Structure Science, School of High Energy Accelerator Science, The Graduate University for Advanced Studies 1-1 Oho Tsukuba Ibaraki 305-0801 Japan
| | - Makina Yabashi
- RIKEN SPring-8 Center 1-1-1 Kouto, Sayo Hyogo 679-5148 Japan
| | - Thomas J Penfold
- Chemistry-School of Natural and Environmental Sciences, Newcastle University Newcastle Upon-Tyne NE1 7RU UK
| | - Wojciech Gawelda
- Departamento de Química, Universidad Autónoma de Madrid, Campus Cantoblanco 28047 Madrid Spain.,IMDEA-Nanociencia, Campus Cantoblanco C/Faraday 9 28049 Madrid Spain.,Faculty of Physics, Adam Mickiewicz University 61-614 Poznań Poland
| | - Gianluca Levi
- Science Institute, University of Iceland 107 Reykjavík Iceland
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3
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Samii R, Fransson A, Mpofu P, Niiranen P, Ojamäe L, Kessler V, O’Brien NJ. Synthesis, Structure, and Thermal Properties of Volatile Group 11 Triazenides as Potential Precursors for Vapor Deposition. Inorg Chem 2022; 61:20804-20813. [PMID: 36516988 PMCID: PMC9795554 DOI: 10.1021/acs.inorgchem.2c03071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Group 11 thin films are desirable as interconnects in microelectronics. Although many M-N-bonded Cu precursors have been explored for vapor deposition, there is currently a lack of suitable Ag and Au derivatives. Herein, we present monovalent Cu, Ag, and Au 1,3-di-tert-butyltriazenides that have potential for use in vapor deposition. Their thermal stability and volatility rival that of current state-of-the-art group 11 precursors with bidentate M-N-bonded ligands. Solution-state thermolysis of these triazenides yielded polycrystalline films of elemental Cu, Ag, and Au. The compounds are therefore highly promising as single-source precursors for vapor deposition of coinage metal films.
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Affiliation(s)
- Rouzbeh Samii
- Department
of Physics, Chemistry and Biology, Linköping
University, Linköping
SE58183, Sweden
| | - Anton Fransson
- Department
of Physics, Chemistry and Biology, Linköping
University, Linköping
SE58183, Sweden
| | - Pamburayi Mpofu
- Department
of Physics, Chemistry and Biology, Linköping
University, Linköping
SE58183, Sweden
| | - Pentti Niiranen
- Department
of Physics, Chemistry and Biology, Linköping
University, Linköping
SE58183, Sweden
| | - Lars Ojamäe
- Department
of Physics, Chemistry and Biology, Linköping
University, Linköping
SE58183, Sweden
| | - Vadim Kessler
- Department
of Molecular Sciences, Swedish University
of Agricultural Sciences, P.O. Box 7015, Uppsala75007, Sweden
| | - Nathan J. O’Brien
- Department
of Physics, Chemistry and Biology, Linköping
University, Linköping
SE58183, Sweden,
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4
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Basaran E, Gamze Sogukomerogullari H, Cakmak R, Akkoc S, Taskin-Tok T, Köse A. Novel chiral Schiff base Palladium(II), Nickel(II), Copper(II) and Iron(II) complexes: Synthesis, characterization, anticancer activity and molecular docking studies. Bioorg Chem 2022; 129:106176. [PMID: 36209564 DOI: 10.1016/j.bioorg.2022.106176] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 09/19/2022] [Accepted: 09/22/2022] [Indexed: 11/02/2022]
Abstract
In this study, two chiral Schiff base ligands (L1 and L2) were synthesized from the condensation reaction of (S)-2-amino-3-phenyl-1-propanol with 2-hydroxybenzaldehyde and 2-hydroxy-1-naphthaldehyde as metal precursors for the preparation of transition metal complexes with Pd(II), Fe(II), Ni(II) and Cu(II). The compounds were characterized by using X-ray (for L1-Pd(II)), NMR, FT-IR, UV-Vis, magnetic susceptibility, molar conductivity, and elemental analysis. The in vitro cytotoxic effects of ligands (L1 and L2) and their metal complexes on colon cancer cells (DLD-1), breast cancer cells (MDA-MB-231) and healthy lung human cell lines were investigated by using the 3-(4,5-dimethylthiazol-2-yl)-2,5‑diphenyl tetrazolium bromide (MTT) assay. Among the synthesized compounds, L1-Pd(II) was particularly found to be the most potent anticancer drug candidate in this series with IC50 values of 4.07, and 9.97 µM in DLD-1 and MDA-MB-231 cell lines, respectively. In addition, molecular docking results indicate that Glu122, Asn103, Ala104, Lys126, Phe114, Leu123, and Lys126 amino acids are the binding site of the colon cancer antigen protein, in which the most active complex, L1-Pd(II) can inhibit the current target.
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Affiliation(s)
- Eyüp Basaran
- Department of Chemistry and Chemical Processing Technologies, Vocational School of Technical Sciences, Batman University, Batman, Turkey.
| | - Hatice Gamze Sogukomerogullari
- Medical Services and Techniques Department, Vocational School of Health Services, Gaziantep University, Gaziantep, Turkey.
| | - Resit Cakmak
- Medical Laboratory Techniques Program, Vocational School of Health Services, Batman University, Batman, Turkey
| | - Senem Akkoc
- Department of Basic Pharmaceutical Sciences, Faculty of Pharmacy, Süleyman Demirel University, Isparta, Turkey; Faculty of Engineering and Natural Sciences, Bahçeşehir University, Istanbul, Turkey
| | - Tugba Taskin-Tok
- Department of Chemistry, Faculty of Science and Arts, Gaziantep University, Gaziantep, Turkey; Department of Bioinformatics and Computational Biology, Institute of Health Sciences, Gaziantep University, Gaziantep, Turkey
| | - Ayşegül Köse
- Department of Property Protection and Safety, Elbistan Vocational School, Kahramanmaras Istiklal University, Kahramanmaras, Turkey
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5
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Hanson-Heine MWD. Static Electron Correlation in Anharmonic Molecular Vibrations: A Hybrid TAO-DFT Study. J Phys Chem A 2022; 126:7273-7282. [PMID: 36164938 PMCID: PMC9574917 DOI: 10.1021/acs.jpca.2c05881] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Hybrid thermally-assisted-occupation density functional theory is used to examine the effects of static electron correlation on the prediction of a benchmark set of experimentally observed molecular vibrational frequencies. The B3LYP and B97-1 thermally-assisted-occupation measure of static electron correlation is important for describing the vibrations of many of the molecules that make up several popular test sets of experimental data. Shifts are seen for known multireference systems and for many molecules containing atoms from the second row of the periodic table of elements. Several molecules only show significant shifts in select vibrational modes, and significant improvements are seen for the prediction of hydrogen stretching frequencies throughout the test set.
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6
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Samii R, Buttera SC, Kessler V, O'Brien NJ. Synthesis, Structure and Thermal Properties of Volatile Indium and Gallium Triazenides**. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200161] [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)
- Rouzbeh Samii
- Department of Physics, Chemistry and Biology Linköping University 581 83 Linköping Sweden
| | - Sydney C. Buttera
- Department of Chemistry Carleton University 1125 Colonel By Drive Ottawa Ontario K1S5B6 Canada
| | - Vadim Kessler
- Department of Molecular Sciences Swedish University of Agricultural Sciences P.O. Box 7015 75007 Uppsala Sweden
| | - Nathan J. O'Brien
- Department of Physics, Chemistry and Biology Linköping University 581 83 Linköping Sweden
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7
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Abou Taka A, Lu SY, Gowland D, Zuehlsdorff TJ, Corzo HH, Pribram-Jones A, Shi L, Hratchian HP, Isborn CM. Comparison of Linear Response Theory, Projected Initial Maximum Overlap Method, and Molecular Dynamics-Based Vibronic Spectra: The Case of Methylene Blue. J Chem Theory Comput 2022; 18:3039-3051. [PMID: 35472264 DOI: 10.1021/acs.jctc.1c01127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The simulation of optical spectra is essential to molecular characterization and, in many cases, critical for interpreting experimental spectra. The most common method for simulating vibronic absorption spectra relies on the geometry optimization and computation of normal modes for ground and excited electronic states. In this report, we show that the utilization of such a procedure within an adiabatic linear response (LR) theory framework may lead to state mixings and a breakdown of the Born-Oppenheimer approximation, resulting in a poor description of absorption spectra. In contrast, computing excited states via a self-consistent field method in conjunction with a maximum overlap model produces states that are not subject to such mixings. We show that this latter method produces vibronic spectra much more aligned with vertical gradient and molecular dynamics (MD) trajectory-based approaches. For the methylene blue chromophore, we compare vibronic absorption spectra computed with the following: an adiabatic Hessian approach with LR theory-optimized structures and normal modes, a vertical gradient procedure, the Hessian and normal modes of maximum overlap method-optimized structures, and excitation energy time-correlation functions generated from an MD trajectory. Because of mixing between the bright S1 and dark S2 surfaces near the S1 minimum, computing the adiabatic Hessian with LR theory and time-dependent density functional theory with the B3LYP density functional predicts a large vibronic shoulder for the absorption spectrum that is not present for any of the other methods. Spectral densities are analyzed and we compare the behavior of the key normal mode that in LR theory strongly couples to the optical excitation while showing S1/S2 state mixings. Overall, our study provides a note of caution in computing vibronic spectra using the excited-state adiabatic Hessian of LR theory-optimized structures and also showcases three alternatives that are less sensitive to adiabatic state mixing effects.
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Affiliation(s)
- Ali Abou Taka
- Department of Chemistry and Biochemistry, University of California Merced, Merced, California 95343, United States
| | - Shao-Yu Lu
- Department of Chemistry and Biochemistry, University of California Merced, Merced, California 95343, United States
| | - Duncan Gowland
- Department of Physics, King's College London, London WC2R 2LS, United Kingdom
| | - Tim J Zuehlsdorff
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, United States
| | - Hector H Corzo
- Department of Chemistry and Biochemistry, University of California Merced, Merced, California 95343, United States
| | - Aurora Pribram-Jones
- Department of Chemistry and Biochemistry, University of California Merced, Merced, California 95343, United States
| | - Liang Shi
- Department of Chemistry and Biochemistry, University of California Merced, Merced, California 95343, United States
| | - Hrant P Hratchian
- Department of Chemistry and Biochemistry, University of California Merced, Merced, California 95343, United States
| | - Christine M Isborn
- Department of Chemistry and Biochemistry, University of California Merced, Merced, California 95343, United States
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8
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Vandaele E, Mališ M, Luber S. The ΔSCF method for non-adiabatic dynamics of systems in the liquid phase. J Chem Phys 2022; 156:130901. [PMID: 35395890 DOI: 10.1063/5.0083340] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Computational studies of ultrafast photoinduced processes give valuable insights into the photochemical mechanisms of a broad range of compounds. In order to accurately reproduce, interpret, and predict experimental results, which are typically obtained in a condensed phase, it is indispensable to include the condensed phase environment in the computational model. However, most studies are still performed in vacuum due to the high computational cost of state-of-the-art non-adiabatic molecular dynamics (NAMD) simulations. The quantum mechanical/molecular mechanical (QM/MM) solvation method has been a popular model to perform photodynamics in the liquid phase. Nevertheless, the currently used QM/MM embedding techniques cannot sufficiently capture all solute-solvent interactions. In this Perspective, we will discuss the efficient ΔSCF electronic structure method and its applications with respect to the NAMD of solvated compounds, with a particular focus on explicit quantum mechanical solvation. As more research is required for this method to reach its full potential, some challenges and possible directions for future research are presented as well.
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Affiliation(s)
- Eva Vandaele
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Momir Mališ
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Sandra Luber
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
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9
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Samii R, Zanders D, Fransson A, Bačić G, Barry ST, Ojamäe L, Kessler V, Pedersen H, O'Brien NJ. Synthesis, Characterization, and Thermal Study of Divalent Germanium, Tin, and Lead Triazenides as Potential Vapor Deposition Precursors. Inorg Chem 2021; 60:12759-12765. [PMID: 34362251 PMCID: PMC8424630 DOI: 10.1021/acs.inorgchem.1c00695] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Only a few M-N bonded divalent group 14 precursors are available for vapor deposition, in particular for Ge and Pb. A majority of the reported precursors are dicoordinated with the Sn(II) amidinates, the only tetracoordinated examples. No Ge(II) and Pb(II) amidinates suitable for vapor deposition have been demonstrated. Herein, we present tetracoordinated Ge(II), Sn(II), and Pb(II) complexes bearing two sets of chelating 1,3-di-tert-butyltriazenide ligands. These compounds are thermally stable, sublime quantitatively between 60 and 75 °C (at 0.5 mbar), and show ideal single-step volatilization by thermogravimetric analysis.
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Affiliation(s)
- Rouzbeh Samii
- Department of Physics, Chemistry and Biology, Linköping University, Linköping SE-581 83, Sweden
| | - David Zanders
- Department of Chemistry, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S5B6, Canada.,Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstraße 150, Bochum 44801, Germany
| | - Anton Fransson
- Department of Physics, Chemistry and Biology, Linköping University, Linköping SE-581 83, Sweden
| | - Goran Bačić
- Department of Chemistry, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S5B6, Canada
| | - Sean T Barry
- Department of Chemistry, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S5B6, Canada
| | - Lars Ojamäe
- Department of Physics, Chemistry and Biology, Linköping University, Linköping SE-581 83, Sweden
| | - Vadim Kessler
- Department of Molecular Sciences, Swedish University of Agricultural Sciences, P.O. Box 7015, Uppsala 75007, Sweden
| | - Henrik Pedersen
- Department of Physics, Chemistry and Biology, Linköping University, Linköping SE-581 83, Sweden
| | - Nathan J O'Brien
- Department of Physics, Chemistry and Biology, Linköping University, Linköping SE-581 83, Sweden
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10
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Hanson-Heine MWD. Reduced Two-Electron Interactions in Anharmonic Molecular Vibrational Calculations Involving Localized Normal Coordinates. J Chem Theory Comput 2021; 17:4383-4391. [PMID: 34087068 DOI: 10.1021/acs.jctc.1c00314] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Spatially localized vibrational normal mode coordinates are shown to reduce the importance of calculating the full set of two-electron terms in the molecular electronic Schrödinger equation. Electron correlation and dispersion interactions become less significant in (E,E)-1,3,5,7-octatetraene vibrational self-consistent field calculations when displacing remote atoms along multiple coordinates. Electron correlation interactions between spatially remote modes are also found to be less important compared to their corresponding uncorrelated interaction terms. Attenuation of the Coulomb operator indicates that the two-electron terms between remote electrons become less important for accurately describing the strongly contributing mode-coupling terms between sets of localized vibrational modes.
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11
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Bourne Worster S, Feighan O, Manby FR. Reliable transition properties from excited-state mean-field calculations. J Chem Phys 2021; 154:124106. [DOI: 10.1063/5.0041233] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Susannah Bourne Worster
- Centre for Computational Chemistry, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
| | - Oliver Feighan
- Centre for Computational Chemistry, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
| | - Frederick R. Manby
- Centre for Computational Chemistry, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
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12
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Samii R, Zanders D, Buttera SC, Kessler V, Ojamäe L, Pedersen H, O'Brien NJ. Synthesis and Thermal Study of Hexacoordinated Aluminum(III) Triazenides for Use in Atomic Layer Deposition. Inorg Chem 2021; 60:4578-4587. [PMID: 33710869 PMCID: PMC8041287 DOI: 10.1021/acs.inorgchem.0c03496] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Amidinate and guanidinate
ligands have been used extensively to
produce volatile and thermally stable precursors for atomic layer
deposition. The triazenide ligand is relatively unexplored as an alternative
ligand system. Herein, we present six new Al(III) complexes bearing
three sets of a 1,3-dialkyltriazenide ligand. These complexes volatilize
quantitatively in a single step with onset volatilization temperatures
of ∼150 °C and 1 Torr vapor pressures of ∼134 °C.
Differential scanning calorimetry revealed that these Al(III) complexes
exhibited exothermic events that overlapped with the temperatures
of their mass loss events in thermogravimetric analysis. Using quantum
chemical density functional theory computations, we found a decomposition
pathway that transforms the relatively large hexacoordinated Al(III)
precursor into a smaller dicoordinated complex. The pathway relies
on previously unexplored interligand proton migrations. These new
Al(III) triazenides provide a series of alternative precursors with
unique thermal properties that could be highly advantageous for vapor
deposition processes of Al containing materials. Six aluminum(III) 1,3-dialkyltriazenides were synthesized
and their thermal properties explored. The compounds were purified
by recrystallization and could be easily sublimed. Thermogravimetric
analysis of compounds showed that all, except one, gave a single step
evaporation with onset volatilization temperatures of ∼150
°C. DFT calculations revealed a unique decomposition pathway
that leads to a small and more reactive Al species that would be highly
advantageous for the surface reactions of atomic layer deposition.
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Affiliation(s)
- Rouzbeh Samii
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83 Linköping, Sweden
| | - David Zanders
- Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstraße 150, 44801 Bochum, Germany.,Department of Chemistry, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S5B6, Canada
| | - Sydney C Buttera
- Department of Chemistry, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S5B6, Canada
| | - Vadim Kessler
- Department of Molecular Sciences, Swedish University of Agricultural Sciences, P.O. Box 7015, 75007 Uppsala, Sweden
| | - Lars Ojamäe
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83 Linköping, Sweden
| | - Henrik Pedersen
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83 Linköping, Sweden
| | - Nathan J O'Brien
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83 Linköping, Sweden
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13
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Chadwick RJ, Wickham K, Besley NA. Simulation of vibrationally resolved absorption spectra of neutral and cationic polyaromatic hydrocarbons. Theor Chem Acc 2020. [DOI: 10.1007/s00214-020-02697-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
AbstractThe identification of the carriers of the absorption features associated with the diffuse interstellar bands (DIBs) is a long-standing problem in astronomical spectroscopy. Computational simulations can contribute to the assignment of the carriers of DIBs since variations in molecular structure and charge state can be studied more readily than through experimental measurements. Polyaromatic hydrocarbons have been proposed as potential carriers of these bands, and it is shown that simulations based upon density functional theory and time-dependent density functional theory calculations can describe the vibrational structure observed in experiment for neutral and cationic naphthalene and pyrene. The vibrational structure arises from a small number of vibrational modes involving in-plane atomic motions, and the Franck–Condon–Herzberg–Teller approximation improves the predicted spectra in comparison with the Franck–Condon approximation. The study also highlights the challenges for the calculations to enable the assignment in the absence of experimental data, namely prediction of the energy separation between the different electronic states to a sufficient level of accuracy and performing vibrational analysis for higher-lying electronic states.
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14
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Carter-Fenk K, Herbert JM. State-Targeted Energy Projection: A Simple and Robust Approach to Orbital Relaxation of Non-Aufbau Self-Consistent Field Solutions. J Chem Theory Comput 2020; 16:5067-5082. [DOI: 10.1021/acs.jctc.0c00502] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Kevin Carter-Fenk
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - John M. Herbert
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
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15
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Neutral excitation density-functional theory: an efficient and variational first-principles method for simulating neutral excitations in molecules. Sci Rep 2020; 10:8947. [PMID: 32488196 PMCID: PMC7265560 DOI: 10.1038/s41598-020-65209-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 04/17/2020] [Indexed: 11/08/2022] Open
Abstract
We introduce neutral excitation density-functional theory (XDFT), a computationally light, generally applicable, first-principles technique for calculating neutral electronic excitations. The concept is to generalise constrained density functional theory to free it from any assumptions about the spatial confinement of electrons and holes, but to maintain all the advantages of a variational method. The task of calculating the lowest excited state of a given symmetry is thereby simplified to one of performing a simple, low-cost sequence of coupled DFT calculations. We demonstrate the efficacy of the method by calculating the lowest single-particle singlet and triplet excitation energies in the well-known Thiel molecular test set, with results which are in good agreement with linear-response time-dependent density functional theory (LR-TDDFT). Furthermore, we show that XDFT can successfully capture two-electron excitations, in principle, offering a flexible approach to target specific effects beyond state-of-the-art adiabatic-kernel LR-TDDFT. Overall the method makes optical gaps and electron-hole binding energies readily accessible at a computational cost and scaling comparable to that of standard density functional theory. Owing to its multiple qualities beneficial to high-throughput studies where the optical gap is of particular interest; namely broad applicability, low computational demand, and ease of implementation and automation, XDFT presents as a viable candidate for research within materials discovery and informatics frameworks.
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16
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Pavošević F, Culpitt T, Hammes-Schiffer S. Multicomponent Quantum Chemistry: Integrating Electronic and Nuclear Quantum Effects via the Nuclear–Electronic Orbital Method. Chem Rev 2020; 120:4222-4253. [DOI: 10.1021/acs.chemrev.9b00798] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fabijan Pavošević
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Tanner Culpitt
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Sharon Hammes-Schiffer
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
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17
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Northey T, Norell J, Fouda AEA, Besley NA, Odelius M, Penfold TJ. Ultrafast nonadiabatic dynamics probed by nitrogen K-edge absorption spectroscopy. Phys Chem Chem Phys 2020; 22:2667-2676. [DOI: 10.1039/c9cp03019k] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Quantum dynamics simulations are used to simulate the ultrafast X-ray Absorption Near-Edge Structure (XANES) spectra of photoexcited pyrazine including two strongly coupled electronically excited states and four normal mode degrees of freedom.
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Affiliation(s)
- T. Northey
- Chemistry-School of Natural and Environmental Sciences
- Newcastle University
- Newcastle upon Tyne
- UK
| | - J. Norell
- Department of Physics
- Stockholm University
- AlbaNova University Center
- Stockholm
- Sweden
| | | | - N. A. Besley
- School of Chemistry
- University of Nottingham
- Nottingham
- UK
| | - M. Odelius
- Department of Physics
- Stockholm University
- AlbaNova University Center
- Stockholm
- Sweden
| | - T. J. Penfold
- Chemistry-School of Natural and Environmental Sciences
- Newcastle University
- Newcastle upon Tyne
- UK
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18
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Toulson BW, Borgwardt M, Wang H, Lackner F, Chatterley AS, Pemmaraju CD, Neumark DM, Leone SR, Prendergast D, Gessner O. Probing ultrafast C-Br bond fission in the UV photochemistry of bromoform with core-to-valence transient absorption spectroscopy. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2019; 6:054304. [PMID: 31649963 PMCID: PMC6800284 DOI: 10.1063/1.5113798] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 09/12/2019] [Indexed: 06/10/2023]
Abstract
UV pump-extreme UV (XUV) probe femtosecond transient absorption spectroscopy is used to study the 268 nm induced photodissociation dynamics of bromoform (CHBr3). Core-to-valence transitions at the Br(3d) absorption edge (∼70 eV) provide an atomic scale perspective of the reaction, sensitive to changes in the local valence electronic structure, with ultrafast time resolution. The XUV spectra track how the singly occupied molecular orbitals of transient electronic states develop throughout the C-Br bond fission, eventually forming radical Br and CHBr2 products. Complementary ab initio calculations of XUV spectral fingerprints are performed for transient atomic arrangements obtained from sampling excited-state molecular dynamics simulations. C-Br fission along an approximately C S symmetrical reaction pathway leads to a continuous change of electronic orbital characters and atomic arrangements. Two timescales dominate changes in the transient absorption spectra, reflecting the different characteristic motions of the light C and H atoms and the heavy Br atoms. Within the first 40 fs, distortion from C 3 v symmetry to form a quasiplanar CHBr2 by the displacement of the (light) CH moiety causes significant changes to the valence electronic structure. Displacement of the (heavy) Br atoms is delayed and requires up to ∼300 fs to form separate Br + CHBr2 products. We demonstrate that transitions between the valence-excited (initial) and valence + core-excited (final) state electronic configurations produced by XUV absorption are sensitive to the localization of valence orbitals during bond fission. The change in valence electron-core hole interaction provides a physical explanation for spectral shifts during the process of bond cleavage.
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Affiliation(s)
- Benjamin W. Toulson
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Mario Borgwardt
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Han Wang
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | | | | | - C. D. Pemmaraju
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford, California 94025, USA
| | | | | | | | - Oliver Gessner
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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19
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Hanson-Heine MW, George MW, Besley NA. Electronically excited state geometries and vibrational frequencies calculated using the algebraic diagrammatic construction scheme for the polarization propagator. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.04.038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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20
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Mei Y, Yang W. Excited-State Potential Energy Surfaces, Conical Intersections, and Analytical Gradients from Ground-State Density Functional Theory. J Phys Chem Lett 2019; 10:2538-2545. [PMID: 31038964 PMCID: PMC7449530 DOI: 10.1021/acs.jpclett.9b00712] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Kohn-Sham density functional theory (KS-DFT) has been a well-established theoretical foundation for ground-state electronic structure and has achieved great success in practical calculations. Recently, utilizing the eigenvalues from KS or generalized KS (GKS) calculations as an approximation to the quasiparticle energies, our group demonstrated a method to calculate the excitation energies from (G)KS calculation on the ground-state ( N - 1)-electron system. This method is now called QE-DFT (quasiparticle energies from DFT). In this work, we extend this QE-DFT method to describe excited-state potential energy surfaces (PESs), conical intersections, and the analytical gradients of excited-state PESs. The analytical gradients were applied to perform geometry optimization for excited states. In conjunction with several commonly used density functional approximations, QE-DFT can yield PESs in the vicinity of the equilibrium structure with accuracy similar to that from time-dependent DFT (TD-DFT). Furthermore, it describes conical intersection well, in contrast to TD-DFT. Good results for geometry optimization, especially bond length, of low-lying excitations for 14 small molecules are presented. The capability of describing excited-state PESs, conical intersections, and analytical gradients from QE-DFT and its efficiency based on just ground-state DFT calculations should be of great interest for describing photochemical and photophysical processes in complex systems.
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Affiliation(s)
- Yuncai Mei
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Weitao Yang
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
- Key Laboratory of Theoretical Chemistry of Environment, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China
- Corresponding Author:
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21
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Hanson-Heine MWD. Excited-State Vibrational Frequencies: Restricted Virtual Space Time-Dependent Density Functional Theory. J Phys Chem A 2019; 123:2949-2956. [DOI: 10.1021/acs.jpca.8b09642] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Pinheiro M, Cardoso DVV, Aquino AJA, Machado FBC, Lischka H. The characterization of electronic defect states of single and double carbon vacancies in graphene sheets using molecular density functional theory. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1567848] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Max Pinheiro
- Departamento de Química, Instituto Tecnológico de Aeronáutica, São Paulo, Brazil
| | | | - Adélia J. A. Aquino
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, USA
- School of Pharmaceutical Sciences and Technology, Tianjin University, Tianjin, People’s Republic of China
- Institute for Theoretical Chemistry, University of Vienna Vienna, Austria
| | | | - Hans Lischka
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, USA
- School of Pharmaceutical Sciences and Technology, Tianjin University, Tianjin, People’s Republic of China
- Institute for Theoretical Chemistry, University of Vienna Vienna, Austria
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23
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Hanson-Heine MW, Calladine JA, Yang J, Towrie M, Horvath R, Besley NA, George MW. A combined time-resolved infrared and density functional theory study of the lowest excited states of 9-fluorenone and 2-naphthaldehyde. Chem Phys 2018. [DOI: 10.1016/j.chemphys.2018.04.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Bhattacherjee A, Pemmaraju CD, Schnorr K, Attar AR, Leone SR. Ultrafast Intersystem Crossing in Acetylacetone via Femtosecond X-ray Transient Absorption at the Carbon K-Edge. J Am Chem Soc 2017; 139:16576-16583. [DOI: 10.1021/jacs.7b07532] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Aditi Bhattacherjee
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Chaitanya Das Pemmaraju
- Theory
Institute for Materials and Energy Spectroscopies, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Kirsten Schnorr
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Andrew R. Attar
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Stephen R. Leone
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Department
of Physics, University of California, Berkeley, California 94720, United States
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25
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Suess CJ, Hirst JD, Besley NA. Quantum chemical calculations of tryptophan → heme electron and excitation energy transfer rates in myoglobin. J Comput Chem 2017; 38:1495-1502. [PMID: 28369976 PMCID: PMC5434924 DOI: 10.1002/jcc.24793] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 03/01/2017] [Accepted: 03/03/2017] [Indexed: 11/10/2022]
Abstract
The development of optical multidimensional spectroscopic techniques has opened up new possibilities for the study of biological processes. Recently, ultrafast two-dimensional ultraviolet spectroscopy experiments have determined the rates of tryptophan → heme electron transfer and excitation energy transfer for the two tryptophan residues in myoglobin (Consani et al., Science, 2013, 339, 1586). Here, we show that accurate prediction of these rates can be achieved using Marcus theory in conjunction with time-dependent density functional theory. Key intermediate residues between the donor and acceptor are identified, and in particular the residues Val68 and Ile75 play a critical role in calculations of the electron coupling matrix elements. Our calculations demonstrate how small changes in structure can have a large effect on the rates, and show that the different rates of electron transfer are dictated by the distance between the heme and tryptophan residues, while for excitation energy transfer the orientation of the tryptophan residues relative to the heme is important. © 2017 The Authors. Journal of Computational Chemistry Published by Wiley Periodicals, Inc.
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Affiliation(s)
- Christian J. Suess
- School of ChemistryUniversity of Nottingham, University ParkNottinghamNG7 2RDUnited Kingdom
| | - Jonathan D. Hirst
- School of ChemistryUniversity of Nottingham, University ParkNottinghamNG7 2RDUnited Kingdom
| | - Nicholas A. Besley
- School of ChemistryUniversity of Nottingham, University ParkNottinghamNG7 2RDUnited Kingdom
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26
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Attar AR, Bhattacherjee A, Pemmaraju CD, Schnorr K, Closser KD, Prendergast D, Leone SR. Femtosecond x-ray spectroscopy of an electrocyclic ring-opening reaction. Science 2017; 356:54-59. [PMID: 28386006 DOI: 10.1126/science.aaj2198] [Citation(s) in RCA: 184] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2016] [Revised: 01/24/2017] [Accepted: 02/22/2017] [Indexed: 01/30/2023]
Abstract
The ultrafast light-activated electrocyclic ring-opening reaction of 1,3-cyclohexadiene is a fundamental prototype of photochemical pericyclic reactions. Generally, these reactions are thought to proceed through an intermediate excited-state minimum (the so-called pericyclic minimum), which leads to isomerization via nonadiabatic relaxation to the ground state of the photoproduct. Here, we used femtosecond (fs) soft x-ray spectroscopy near the carbon K-edge (~284 electron volts) on a tabletop apparatus to directly reveal the valence electronic structure of this transient intermediate state. The core-to-valence spectroscopic signature of the pericyclic minimum observed in the experiment was characterized, in combination with time-dependent density functional theory calculations, to reveal overlap and mixing of the frontier valence orbital energy levels. We show that this transient valence electronic structure arises within 60 ± 20 fs after ultraviolet photoexcitation and decays with a time constant of 110 ± 60 fs.
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Affiliation(s)
- Andrew R Attar
- Department of Chemistry, University of California, Berkeley, CA 94720, USA.,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Aditi Bhattacherjee
- Department of Chemistry, University of California, Berkeley, CA 94720, USA.,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - C D Pemmaraju
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.,Theory Institute for Materials and Energy Spectroscopies, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Kirsten Schnorr
- Department of Chemistry, University of California, Berkeley, CA 94720, USA.,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Kristina D Closser
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - David Prendergast
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Stephen R Leone
- Department of Chemistry, University of California, Berkeley, CA 94720, USA. .,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.,Department of Physics, University of California, Berkeley, CA 94720, USA
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27
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Hanson-Heine MWD, George MW, Besley NA. Kohn-Sham density functional theory calculations of non-resonant and resonant x-ray emission spectroscopy. J Chem Phys 2017. [DOI: 10.1063/1.4977178] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Affiliation(s)
| | - Michael W. George
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, United Kingdom
- Department of Chemical and Environmental Engineering, University of Nottingham Ningbo China, 199 Taiking East Rd., Ningbo 315100, Zhejiang, China
| | - Nicholas A. Besley
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, United Kingdom
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28
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Hanson-Heine MWD. Intermediate vibrational coordinate localization with harmonic coupling constraints. J Chem Phys 2017; 144:204116. [PMID: 27250288 DOI: 10.1063/1.4951011] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Optimized normal coordinates can significantly improve the speed and accuracy of vibrational frequency calculations. However, over-localization can occur when using unconstrained spatial localization techniques. The unintuitive mixtures of stretching and bending coordinates that result can make interpreting spectra more difficult and also cause artificial increases in mode-coupling during anharmonic calculations. Combining spatial localization with a constraint on the coupling between modes can be used to generate coordinates with properties in-between the normal and fully localized schemes. These modes preserve the diagonal nature of the mass-weighted Hessian matrix to within a specified tolerance and are found to prevent contamination between the stretching and bending vibrations of the molecules studied without a priori classification of the different types of vibration present. Relaxing the constraint can also be used to identify which normal modes form specific groups of localized modes. The new coordinates are found to center on more spatially delocalized functional groups than their fully localized counterparts and can be used to tune the degree of vibrational correlation energy during anharmonic calculations.
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Affiliation(s)
- Magnus W D Hanson-Heine
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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29
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Hanson-Heine MWD. Examining the impact of harmonic correlation on vibrational frequencies calculated in localized coordinates. J Chem Phys 2016; 143:164104. [PMID: 26520495 DOI: 10.1063/1.4934234] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Carefully choosing a set of optimized coordinates for performing vibrational frequency calculations can significantly reduce the anharmonic correlation energy from the self-consistent field treatment of molecular vibrations. However, moving away from normal coordinates also introduces an additional source of correlation energy arising from mode-coupling at the harmonic level. The impact of this new component of the vibrational energy is examined for a range of molecules, and a method is proposed for correcting the resulting self-consistent field frequencies by adding the full coupling energy from connected pairs of harmonic and pseudoharmonic modes, termed vibrational self-consistent field (harmonic correlation). This approach is found to lift the vibrational degeneracies arising from coordinate optimization and provides better agreement with experimental and benchmark frequencies than uncorrected vibrational self-consistent field theory without relying on traditional correlated methods.
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Affiliation(s)
- Magnus W D Hanson-Heine
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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30
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Li C, Salén P, Yatsyna V, Schio L, Feifel R, Squibb R, Kamińska M, Larsson M, Richter R, Alagia M, Stranges S, Monti S, Carravetta V, Zhaunerchyk V. Experimental and theoretical XPS and NEXAFS studies of N-methylacetamide and N-methyltrifluoroacetamide. Phys Chem Chem Phys 2016; 18:2210-8. [DOI: 10.1039/c5cp06441d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Experimental and theoretical spectra of N-methylacetamide and N-methyltrifluoroacetamide at the K-edges are reported.
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31
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Kowalczyk T, Le K, Irle S. Self-Consistent Optimization of Excited States within Density-Functional Tight-Binding. J Chem Theory Comput 2015; 12:313-23. [DOI: 10.1021/acs.jctc.5b00734] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Tim Kowalczyk
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Chemistry,
Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
- Department
of Chemistry, Advanced Materials Science and Engineering Center, and
Institute for Energy Studies, Western Washington University, Bellingham, Washington 98225, United States
| | - Khoa Le
- Department
of Chemistry, Advanced Materials Science and Engineering Center, and
Institute for Energy Studies, Western Washington University, Bellingham, Washington 98225, United States
| | - Stephan Irle
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Chemistry,
Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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32
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Hanson-Heine MWD, Wriglesworth A, Uroos M, Calladine JA, Murphy TS, Hamilton M, Clark IP, Towrie M, Dowden J, Besley NA, George MW. Calculating singlet excited states: Comparison with fast time-resolved infrared spectroscopy of coumarins. J Chem Phys 2015; 142:154119. [DOI: 10.1063/1.4917311] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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33
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Briggs EA, Besley NA. Density Functional Theory Based Analysis of Photoinduced Electron Transfer in a Triazacryptand Based K+ Sensor. J Phys Chem A 2015; 119:2902-7. [DOI: 10.1021/acs.jpca.5b01124] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Edward A. Briggs
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Nicholas A. Besley
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
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34
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Park YC, Krykunov M, Ziegler T. On the relation between adiabatic time dependent density functional theory (TDDFT) and the ΔSCF-DFT method. Introducing a numerically stable ΔSCF-DFT scheme for local functionals based on constricted variational DFT. Mol Phys 2015. [DOI: 10.1080/00268976.2014.1003260] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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35
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Zhang Y, Hua W, Bennett K, Mukamel S. Nonlinear Spectroscopy of Core and Valence Excitations Using Short X-Ray Pulses: Simulation Challenges. DENSITY-FUNCTIONAL METHODS FOR EXCITED STATES 2014; 368:273-345. [DOI: 10.1007/128_2014_618] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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36
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Briggs EA, Besley NA. Modelling excited states of weakly bound complexes with density functional theory. Phys Chem Chem Phys 2014; 16:14455-62. [DOI: 10.1039/c3cp55361b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Different dispersion correction parameters are required to describe the interaction when the molecule is in an excited Rydberg state.
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Affiliation(s)
- Edward A. Briggs
- School of Chemistry
- University of Nottingham
- University Park
- Nottingham, UK
| | - Nicholas A. Besley
- School of Chemistry
- University of Nottingham
- University Park
- Nottingham, UK
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37
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Yost SR, Kowalczyk T, Van Voorhis T. A multireference perturbation method using non-orthogonal Hartree-Fock determinants for ground and excited states. J Chem Phys 2013; 139:174104. [DOI: 10.1063/1.4827456] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
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38
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Richings GW, Karadakov PB. Improved convergence of Hartree–Fock style excited-state wavefunctions using second-order optimisation with an exact Hessian. Theor Chem Acc 2013. [DOI: 10.1007/s00214-013-1400-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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39
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Ershova OV, Kłos J, Harris JP, Gardner AM, Tamé-Reyes VM, Andrejeva A, Alexander MH, Besley NA, Wright TG. Interaction of the NO 3 pπ Rydberg state with Ar: Potential energy surfaces and spectroscopy. J Chem Phys 2013; 138:214313. [DOI: 10.1063/1.4808027] [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
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