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Miral A, Ferron S, Rouaud I, Slyambayev D, Bousarghin L, Camuzet C, Belouzard S, Séron K, Le Pogam P, Tranchimand S, Tomasi S. Eremoxylarins D-J, Antibacterial Eremophilane Sesquiterpenes Discovered from an Endolichenic Strain of Xylaria hypoxylon. JOURNAL OF NATURAL PRODUCTS 2023; 86:730-738. [PMID: 36892834 DOI: 10.1021/acs.jnatprod.2c00881] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
An endolichenic strain of the Ascomycetaceous Xylaria hypoxylon, cultivated alone or in coculture with another endolichenic fungus Dendrothyrium variisporum, produced seven new bioactive eremophilane sesquiterpenes eremoxylarins D-J (1-7). The isolated compounds disclosed a high similarity with the eremophilane core of the bioactive integric acid, and structures were elucidated by 1D and 2D NMR spectra and electronic circular dichroism (ECD) analyses. Eremoxylarins D, F, G, and I showed a selective activity against Gram-positive bacteria such as methicillin-resistant Staphylococcus aureus with minimum inhibitory concentration (MIC) values between 0.39 and 12.5 μg/mL. Eremoxylarin I, the most antibacterial active sesquiterpene, was also active against HCoV-229E at a concentration nontoxic to the hepatoma Huh-7 cell line with an 50% inhibitory concentration (IC50) of 18.1 μM and a 50% cytotoxic concentration (CC50) of 46.6 μM.
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Affiliation(s)
- Alice Miral
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, 35042 Rennes, France
| | - Solenn Ferron
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, 35042 Rennes, France
| | - Isabelle Rouaud
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, 35042 Rennes, France
| | - Dinmukhammed Slyambayev
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, 35042 Rennes, France
| | - Latifa Bousarghin
- INSERM, Univ. Rennes, INRAE, CHU Rennes, Nutrition Metabolisms and Cancer (NuMeCan), UMR 1317, Biosit, MRic/ISFR, 35000 Rennes, France
| | - Charline Camuzet
- Univ. Lille, CNRS, Inserm, CHU Lille, Institut Pasteur de Lille, U1019-UMR 9017, Center for Infection and Immunity of Lille (CIIL), F-59000 Lille, France
| | - Sandrine Belouzard
- Univ. Lille, CNRS, Inserm, CHU Lille, Institut Pasteur de Lille, U1019-UMR 9017, Center for Infection and Immunity of Lille (CIIL), F-59000 Lille, France
| | - Karin Séron
- Univ. Lille, CNRS, Inserm, CHU Lille, Institut Pasteur de Lille, U1019-UMR 9017, Center for Infection and Immunity of Lille (CIIL), F-59000 Lille, France
| | - Pierre Le Pogam
- Équipe Chimie des Substances Naturelles, BioCIS, CNRS, Université Paris-Saclay, 17, avenue des Sciences, 91400 Orsay, France
| | - Sylvain Tranchimand
- ENSCR, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, 35708 Rennes, France
| | - Sophie Tomasi
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, 35042 Rennes, France
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2
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Yeh SH, Manjanath A, Cheng YC, Chai JD, Hsu CP. Excitation energies from thermally assisted-occupation density functional theory: Theory and computational implementation. J Chem Phys 2020; 153:084120. [PMID: 32872866 DOI: 10.1063/1.5140243] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The time-dependent density functional theory (TDDFT) has been broadly used to investigate the excited-state properties of various molecular systems. However, the current TDDFT heavily relies on outcomes from the corresponding ground-state DFT calculations, which may be prone to errors due to the lack of proper treatment in the non-dynamical correlation effects. Recently, thermally assisted-occupation DFT (TAO-DFT) [J.-D. Chai, J. Chem. Phys. 136, 154104 (2012)], a DFT with fractional orbital occupations, was proposed, explicitly incorporating the non-dynamical correlation effects in the ground-state calculations with low computational complexity. In this work, we develop TDTAO-DFT, which is a TD, linear-response theory for excited states within the framework of TAO-DFT. With tests on the excited states of H2, the first triplet excited state (13Σu +) was described well, with non-imaginary excitation energies. TDTAO-DFT also yields zero singlet-triplet gap in the dissociation limit for the ground singlet (11Σg +) and the first triplet state (13Σu +). In addition, as compared to traditional TDDFT, the overall excited-state potential energy surfaces obtained from TDTAO-DFT are generally improved and better agree with results from the equation-of-motion coupled-cluster singles and doubles.
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Affiliation(s)
- Shu-Hao Yeh
- Institute of Chemistry, Academia Sinica, Taipei 11529, Taiwan
| | | | - Yuan-Chung Cheng
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Jeng-Da Chai
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - Chao-Ping Hsu
- Institute of Chemistry, Academia Sinica, Taipei 11529, Taiwan
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Sajid A, Ford MJ, Reimers JR. Single-photon emitters in hexagonal boron nitride: a review of progress. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2020; 83:044501. [PMID: 31846956 DOI: 10.1088/1361-6633/ab6310] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
This report summarizes progress made in understanding properties such as zero-phonon-line energies, emission and absorption polarizations, electron-phonon couplings, strain tuning and hyperfine coupling of single photon emitters in hexagonal boron nitride. The primary aims of this research are to discover the chemical nature of the emitting centres and to facilitate deployment in device applications. Critical analyses of the experimental literature and data interpretation, as well as theoretical approaches used to predict properties, are made. In particular, computational and theoretical limitations and challenges are discussed, with a range of suggestions made to overcome these limitations, striving to achieve realistic predictions concerning the nature of emitting centers. A symbiotic relationship is required in which calculations focus on properties that can easily be measured, whilst experiments deliver results in a form facilitating mass-produced calculations.
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Affiliation(s)
- A Sajid
- University of Technology Sydney, School of Mathematical and Physical Sciences, Ultimo, New South Wales 2007, Australia. CAMD, Department of Physics, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark. Department of Physics, GC University Faisalabad, Allama Iqbal Road, 38000 Faisalabad, Pakistan. Author to whom any correspondence should be addressed
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4
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Multistate density functional theory applied with 3 unpaired electrons in 3 orbitals: The singdoublet and tripdoublet states of the ethylene cation. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.136803] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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5
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Rahimi E, Reimers JR. Molecular quantum cellular automata cell design trade-offs: latching vs. power dissipation. Phys Chem Chem Phys 2018; 20:17881-17888. [PMID: 29924110 DOI: 10.1039/c8cp02886a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The use of molecules to enact quantum cellular automata (QCA) cells has been proposed as a new way for performing electronic logic operations at sub-nm dimensions. A key question that arises concerns whether chemical or physical processes are to be exploited. The use of chemical reactions allows the state of a switch element to be latched in molecular form, making the output of a cell independent of its inputs, but costs energy to do the reaction. Alternatively, if purely electronic polarization is manipulated then no internal latching occurs, but no power is dissipated provided the fields from the inputs change slowly compared to the molecular response times. How these scenarios pan out is discussed by considering calculated properties of the 1,4-diallylbutane cation, a species often used as a paradigm for molecular electronic switching. Utilized are results from different calculation approaches that depict the ion either as a charge-localized mixed-valence compound functioning as a bistable switch, or else as an extremely polarizable molecule with a delocalized electronic structure. Practical schemes for using molecular cells in QCA and other devices emerge.
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Affiliation(s)
- Ehsan Rahimi
- Faculty of Electrical and Robotic Engineering, Shahrood University of Technology, Shahrood, Iran.
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Reimers JR, Sajid A, Kobayashi R, Ford MJ. Understanding and Calibrating Density-Functional-Theory Calculations Describing the Energy and Spectroscopy of Defect Sites in Hexagonal Boron Nitride. J Chem Theory Comput 2018; 14:1602-1613. [DOI: 10.1021/acs.jctc.7b01072] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jeffrey R. Reimers
- International Centre for Quantum and Molecular Structures and Department of Physics, Shanghai University, Shanghai 200444, China
- School of Mathematical and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
| | - A. Sajid
- School of Mathematical and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
- Department of Physics, GC University Faisalabad, Allama Iqbal Road, 38000 Faisalabad, Pakistan
| | - Rika Kobayashi
- National Computational Infrastructure, The Australian National University, Canberra, Austrailian Capital Territory 2600, Australia
| | - Michael J. Ford
- School of Mathematical and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
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Abstract
David Craig (1919–2015) left us with a lasting legacy concerning basic understanding of chemical spectroscopy and bonding. This is expressed in terms of some of the recent achievements of my own research career, with a focus on integration of Craig’s theories with those of Noel Hush to solve fundamental problems in photosynthesis, molecular electronics (particularly in regard to the molecules synthesized by Maxwell Crossley), and self-assembled monolayer structure and function. Reviewed in particular is the relation of Craig’s legacy to: the 50-year struggle to assign the visible absorption spectrum of arguably the world’s most significant chromophore, chlorophyll; general theories for chemical bonding and structure extending Hush’s adiabatic theory of electron-transfer processes; inelastic electron-tunnelling spectroscopy (IETS); chemical quantum entanglement and the Penrose–Hameroff model for quantum consciousness; synthetic design strategies for NMR quantum computing; Gibbs free-energy measurements and calculations for formation and polymorphism of organic self-assembled monolayers on graphite surfaces from organic solution; and understanding the basic chemical processes involved in the formation of gold surfaces and nanoparticles protected by sulfur-bound ligands, ligands whose form is that of Au0-thiyl rather than its commonly believed AuI-thiolate tautomer.
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Excited-State Hydrogen Bonding Dynamics of Hydrogen-Bonded Clusters Formed by of Coumarin Derivatives in Aqueous Solution: A Time-Dependent Density Functional Theory Study. J CLUST SCI 2012. [DOI: 10.1007/s10876-012-0466-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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9
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Time-dependent density functional theory gradients in the Amsterdam density functional package: geometry optimizations of spin-flip excitations. Theor Chem Acc 2010. [DOI: 10.1007/s00214-010-0819-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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10
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Samanta A, Paul BK, Mahanta S, Singh RB, Kar S, Guchhait N. Evidence of acid mediated enhancement of photoinduced charge transfer reaction in 2-methoxy-4-(N,N-dimethylamino)benzaldehyde: Spectroscopic and quantum chemical study. J Photochem Photobiol A Chem 2010. [DOI: 10.1016/j.jphotochem.2010.04.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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11
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Mikhailov IA, Belfield KD, Masunov AE. DFT-Based Methods in the Design of Two-Photon Operated Molecular Switches. J Phys Chem A 2009; 113:7080-9. [DOI: 10.1021/jp8113368] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ivan A. Mikhailov
- NanoScience Technology Center, University of Central Florida, 12424 Research Parkway, Orlando, Florida 32826, and Department of Chemistry, CREOL, College of Optics and Photonics, and Department of Physics, University of Central Florida, P.O. Box 162366, Orlando, Florida 32816-2366
| | - Kevin D. Belfield
- NanoScience Technology Center, University of Central Florida, 12424 Research Parkway, Orlando, Florida 32826, and Department of Chemistry, CREOL, College of Optics and Photonics, and Department of Physics, University of Central Florida, P.O. Box 162366, Orlando, Florida 32816-2366
| | - Artëm E. Masunov
- NanoScience Technology Center, University of Central Florida, 12424 Research Parkway, Orlando, Florida 32826, and Department of Chemistry, CREOL, College of Optics and Photonics, and Department of Physics, University of Central Florida, P.O. Box 162366, Orlando, Florida 32816-2366
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Chakraborty A, Ghosh S, Kar S, Nath D, Guchhait N. Dual emission from (E)-3-(4-methylamino-phenyl)-acrylic acid ethyl ester (MAPAEE) and its application as fluorescence probe for studying micellar and protein microenvironment. J Mol Struct 2009. [DOI: 10.1016/j.molstruc.2008.07.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Asmuruf FA, Besley NA. Time dependent density functional theory study of the near-edge x-ray absorption fine structure of benzene in gas phase and on metal surfaces. J Chem Phys 2008; 129:064705. [DOI: 10.1063/1.2967190] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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14
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Thut M, Tanner C, Steinlin A, Leutwyler S. Time-Dependent Density Functional Theory As a Tool for Isomer Assignments of Hydrogen-Bonded Solute·Solvent Clusters. J Phys Chem A 2008; 112:5566-72. [DOI: 10.1021/jp801044x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Markus Thut
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3000 Bern 9, Switzerland
| | - Christian Tanner
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3000 Bern 9, Switzerland
| | - Andreas Steinlin
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3000 Bern 9, Switzerland
| | - Samuel Leutwyler
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3000 Bern 9, Switzerland
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15
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Photoinduced intramolecular charge transfer in methyl ester of N,N′-Dimethylaminonaphthyl-(acrylic)-acid: Spectroscopic measurement and quantum chemical calculations. J Photochem Photobiol A Chem 2008. [DOI: 10.1016/j.jphotochem.2007.08.030] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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16
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Spectroscopic study of excited state intramolecular charge transfer in ethyl ester of N,N′-Dimethylaminonaphthyl-(acrylic)-acid. Chem Phys 2007. [DOI: 10.1016/j.chemphys.2007.09.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Rai D, Joshi H, Kulkarni AD, Gejji SP, Pathak RK. Electric field effects on aromatic and aliphatic hydrocarbons: a density-functional study. J Phys Chem A 2007; 111:9111-21. [PMID: 17722897 DOI: 10.1021/jp074051v] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The influence of a uniform static external electric field on some aliphatic and aromatic molecular species is studied within the density functional theory (DFT) employing the 6-311++G(2d,2p) basis set with B3LYP exchange-correlation prescription. The electric field perturbs the molecular geometry but drastically alters the dipole moments and engenders, to a varying degree, the molecular vibrational Stark effect, i.e., shifts in the infrared (IR) vibrational frequencies accompanied by spectral intensity redistribution. For polar molecules, significant negative ("red") and positive ("blue") frequency shifts are observed for field orientations both parallel and antiparallel to their permanent dipole moments. Further, a selective reordering of frontier orbitals is observed to be brought about by moderately intense fields. In particular, molecules having a lowest unoccupied molecular orbital (LUMO) with predominant pi character possess a threshold field beyond which energy gap between the highest occupied molecular orbital (HOMO) and LUMO diminishes rapidly. A time-dependent (TD) DFT analysis reveals that an increase in the applied field strength by and large increases the excitation energies corresponding to significant electronic transitions among frontier MOs with a concomitant decrease in their oscillator strengths.
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Affiliation(s)
- Dhurba Rai
- Department of Physics, University of Pune, Pune-411007, India
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Hu C, Hirai H, Sugino O. Nonadiabatic couplings from time-dependent density functional theory: Formulation in the Casida formalism and practical scheme within modified linear response. J Chem Phys 2007; 127:064103. [PMID: 17705584 DOI: 10.1063/1.2755665] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present an efficient method to compute nonadiabatic couplings (NACs) between the electronically ground and excited states of molecules, within the framework of time-dependent density functional theory (TDDFT) in frequency domain. Based on the comparison of dynamic polarizability formulated both in the many-body wave function form and the Casida formalism, a rigorous expression is established for NACs, which is similar to the calculation of oscillator strength in the Casida formalism. The adiabatic local density approximation (ALDA) gives results in reasonable accuracy as long as the conical intersection (ci) is not approached too closely, while its performance quickly degrades near the ci point. This behavior is consistent with the real-time TDDFT calculation. Through the use of modified linear response theory together with the ground-state-component separation scheme, the performance of ALDA can be greatly improved, not only in the vicinity of ci but also for Rydberg transitions and charge-transfer excitations. Several calculation examples, including the quantization of NACs from the Jahn-Teller effect in the H3 system, have been given to show that TDDFT can efficiently give NACs with an accuracy comparable to that of wave-function-based methods.
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Affiliation(s)
- Chunping Hu
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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19
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Reimers JR, Solomon GC, Gagliardi A, Bilić A, Hush NS, Frauenheim T, Di Carlo A, Pecchia A. The Green's Function Density Functional Tight-Binding (gDFTB) Method for Molecular Electronic Conduction. J Phys Chem A 2007; 111:5692-702. [PMID: 17530826 DOI: 10.1021/jp070598y] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A review is presented of the nonequilibrium Green's function (NEGF) method "gDFTB" for evaluating elastic and inelastic conduction through single molecules employing the density functional tight-binding (DFTB) electronic structure method. This focuses on the possible advantages that DFTB implementations of NEGF have over conventional methods based on density functional theory, including not only the ability to treat large irregular metal-molecule junctions with high nonequilibrium thermal distributions but perhaps also the ability to treat dispersive forces, bond breakage, and open-shell systems and to avoid large band lineup errors. New results are presented indicating that DFTB provides a useful depiction of simple gold-thiol interactions. Symmetry is implemented in DFTB, and the advantages it brings in terms of large savings of computational resources with significant increase in numerical stability are described. The power of DFTB is then harnessed to allow the use of gDFTB as a real-time tool to discover the nature of the forces that control inelastic charge transport through molecules and the role of molecular symmetry in determining both elastic and inelastic transport. Future directions for the development of the method are discussed.
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Chakraborty A, Kar S, Nath DN, Guchhait N. Photoinduced Intramolecular Charge Transfer Reaction in (E)-3-(4-Methylamino-phenyl)-acrylic Acid Methyl Ester: A Fluorescence Study in Combination with TDDFT Calculation. J Phys Chem A 2006; 110:12089-95. [PMID: 17078602 DOI: 10.1021/jp0629846] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A donor-acceptor substituted aromatic system (E)-3-(4-Methylamino-phenyl)-acrylic acid methyl ester (MAPAME) has been synthesized, and its photophysical behavior obtained spectroscopically has been compared with the theoretical results. The observed dual fluorescence from MAPAME has been assigned to emission from locally excited and twisted intramolecular charge transfer states. The donor and acceptor angular dependency on the ground and excited states potential energy surfaces have been calculated both in vacuo and in acetonitrile solvent using time dependent density functional theory (TDDFT) and TDDFT polarized continuum model (TDDFT-PCM), respectively. Calculation predicts that a stabilized twisted excited state is responsible for red shifted charge transfer emission.
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Affiliation(s)
- Amrita Chakraborty
- Department of Chemistry, University of Calcutta, 92, A.P.C. Road, Kolkata 700009, India
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Vázquez-Mayagoitia Á, Vargas R, Nichols JA, Fuentealba P, Garza J. Relationship between singlet–triplet excitation energies and the Kohn–Sham orbitals obtained with potentials that exhibit a wrong asymptotic behavior. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2005.11.075] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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22
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Waterland R, Hurley M, Misner J, Wallington T, Melo S, Strong K, Dumoulin R, Castera L, Stock N, Mabury S. Gas phase UV and IR absorption spectra of CF3CH2CH2OH and F(CF2CF2)xCH2CH2OH (x=2, 3, 4). J Fluor Chem 2005. [DOI: 10.1016/j.jfluchem.2005.06.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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23
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Hashikawa Y, Kawasaki M, Waterland R, Hurley M, Ball J, Wallington T, Andersen MS, Nielsen O. Gas phase UV and IR absorption spectra of CxF2x+1CHO (x = 1–4). J Fluor Chem 2004. [DOI: 10.1016/j.jfluchem.2004.07.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Solomon GC, Reimers JR, Hush NS. Single molecule conductivity: The role of junction-orbital degeneracy in the artificially high currents predicted by ab initio approaches. J Chem Phys 2004; 121:6615-27. [PMID: 15473716 DOI: 10.1063/1.1791011] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A priori evaluations, using Hartree-Fock self-consistent-field (SCF) theory or density-functional theory (DFT), of the current passing between two electrodes through a single bridging molecule result in predicted conductivities that may be up to one to two orders of magnitude larger than observed ones. We demonstrate that this is, in part, often due to the improper application of the computational methods. Conductivity is shown to arise from tunneling between junction states of the electrodes through the molecule; these states are inherently either quasi two-fold or four-fold degenerate and always comprise the (highest occupied molecular orbital) HOMO band at the Fermi energy of the system. Frequently, in previous cluster based molecular conduction calculations, closed-shell SCF or Kohn-Sham DFT methods have been applied to systems that we demonstrate to be intrinsically open shell in nature. Such calculations are shown to induce artificial HOMO-LUMO (LUMO-lowest unoccupied molecular orbital) band splittings that Landauer-based formalisms for steady-state conduction interpret as arising from extremely rapid through-molecule tunneling at the Fermi energy, hence, overestimating the low-voltage conductivity. It is demonstrated that these shortcomings can be eliminated, dramatically reducing calculated current magnitudes, through the alternate use of electronic-structure calculations based on the spin-restricted open-shell formalism and related multiconfigurational SCF of DFT approaches. Further, we demonstrate that most anomalies arising in DFT implementations arise through the use of hybrid density functionals such as B3LYP. While the enhanced band-gap properties of these functionals have made them the defacto standard in molecular conductivity calculations, we demonstrate that it also makes them particularly susceptible to open-shell anomalies.
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Affiliation(s)
- Gemma C Solomon
- School of Chemistry, University of Sydney, NSW 2006, Australia
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25
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Hellman A, Razaznejad B, Lundqvist BI. Potential-energy surfaces for excited states in extended systems. J Chem Phys 2004; 120:4593-602. [PMID: 15267318 DOI: 10.1063/1.1645787] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
With a simple and physically intuitive method, first-principles calculations of potential-energy surfaces are performed for excited states in a number of illustrative systems, including dimers (H(2) and NaCl) and gas-surface systems [Cl-Na(100) and Cl(2)-Na(100)]. It is based on density-functional theory and is a generalization of the Delta self-consistent field (DeltaSCF) method, where electron-hole pairs are introduced in order to model excited states, corresponding to internal electron transfers in the considered system. The desired excitations are identified by analysis of calculated electron orbitals, local densities of states, and charge densities. For extended systems, where reliable first-principles methods to account for electronically excited states have so far been scarce, our method is very promising. Calculated results, such as the chemiluminescence of halogen molecules impinging on a alkali-metal surface, and the vertical (5 sigma-->2 pi(*)) excitation within the adsorbed CO molecule on the Pd(111) surface, are in working agreement with those of other studies and experiments.
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Affiliation(s)
- A Hellman
- Department of Applied Physics, Chalmers University of Technology and Goteborg University, SE-412 96 Goteborg, Sweden.
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Reimers JR, Cai ZL, Bilić A, Hush NS. The Appropriateness of Density-Functional Theory for the Calculation of Molecular Electronics Properties. Ann N Y Acad Sci 2003; 1006:235-51. [PMID: 14976022 DOI: 10.1196/annals.1292.017] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
As molecular electronics advances, efficient and reliable computation procedures are required for the simulation of the atomic structures of actual devices, as well as for the prediction of their electronic properties. Density-functional theory (DFT) has had widespread success throughout chemistry and solid-state physics, and it offers the possibility of fulfilling these roles. In its modern form it is an empirically parameterized approach that cannot be extended toward exact solutions in a prescribed way, ab initio. Thus, it is essential that the weaknesses of the method be identified and likely shortcomings anticipated in advance. We consider four known systematic failures of modern DFT: dispersion, charge transfer, extended pi conjugation, and bond cleavage. Their ramifications for molecular electronics applications are outlined and we suggest that great care is required when using modern DFT to partition charge flow across electrode-molecule junctions, screen applied electric fields, position molecular orbitals with respect to electrode Fermi energies, and in evaluating the distance dependence of through-molecule conductivity. The causes of these difficulties are traced to errors inherent in the types of density functionals in common use, associated with their inability to treat very long-range electron correlation effects. Heuristic enhancements of modern DFT designed to eliminate individual problems are outlined, as are three new schemes that each represent significant departures from modern DFT implementations designed to provide a priori improvements in at least one and possible all problem areas. Finally, fully semiempirical schemes based on both Hartree-Fock and Kohn-Sham theory are described that, in the short term, offer the means to avoid the inherent problems of modern DFT and, in the long term, offer competitive accuracy at dramatically reduced computational costs.
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Affiliation(s)
- Jeffrey R Reimers
- School of Chemistry, The University of Sydney, New South Wales, Australia.
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Zhan CG, Dixon DA, Matsuzawa NN, Ishitani A, Uda T. Time-dependent density functional theory calculations of the photoabsorption of fluorinated alkanes. J Fluor Chem 2003. [DOI: 10.1016/s0022-1139(03)00077-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Jamorski Jödicke C, Lüthi HP. Time-dependent density functional theory (TDDFT) study of the excited charge-transfer state formation of a series of aromatic donor-acceptor systems. J Am Chem Soc 2003; 125:252-64. [PMID: 12515528 DOI: 10.1021/ja020361+] [Citation(s) in RCA: 127] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Singlet excitation energy calculations for a series of acceptor para-substituted N,N-dimethyl-anilines that are dual (4-(N,N-dimethylamino)benzonitrile, 4DMAB-CN, 4-(N,N-dimethylamino)benzaldhyde, 4DMAB-CHO, 1-methyl-7-cyano-2,3,4,5-tetrahydro-1H-1-benzazepine, NMC7) and nondual (4-aminobenzonitrile, 4AB-CN, 3-(N,N-dimethylamino)benzonitrile, 3DMAB-CN, and 4-nitro(N,N-dimethyl) aniline, 4DMAB-NO(2)) fluorescent have been performed using time-dependent density functional theory (TDDFT). The B3LYP and MPW1PW91 functionals with a 6-311+G(2d,p) (Bg) basis set have been used to compute excitation energies. Ground-state geometries were optimized using density functional theory (DFT) with both B3LYP and MPW1PW91 functionals combined with a 6-31G(d) basis set. For most of the molecules presented in this study, potential energy surfaces have been computed according to the coordinates related to the three following mechanisms proposed in the literature: twisting, wagging, and planar intramolecular charge transfer (ICT). Comparison of the three models for the different molecules leads to the conclusion that only the twisting ICT model is able to explain the low frequency, strongly solvent-dependent energy band present in the fluorescence spectra. According to this model, the 4AB-CN molecule is calculated to be nondual fluorescent in agreement with the experimental spectra. The single band observed in the fluorescence spectra of TMAB-CN (4-(N,N-dimethylamino)-3,5-(dimethyl)benzonitrile) is due to a large stabilization of the charge-transfer excited state along the twisting coordinate. The nondual fluorescence of the 4DMAB-NO(2) molecule is explained by the same mechanism. In the case of 3DMAB-CN, the single observed emission, which is solvent-dependent, has been assigned to the lowest charge-transfer excited state. The dual fluorescence of 4DMAB-CN and 4DMAB-CHO is explained within the twisting ICT model by a double mechanism (already proposed by Serrano et al.: Serrano-Andrés, L.; Merchán, M.; Roos, B. J.; Lindh, R. J. Am. Chem. Soc. 1995, 117, 3189) that involves the presence of two low-lying states close enough in energy. The observation of dual fluorescence in NMC7, that has been one of the origins of the planar ICT model put forward by Zachariasse et al. (Zachariasse, K.; van der Haar, T.; Hebecker, A.; Leinhos, U.; Kühnle, W. Pure Appl. Chem. 1993, 65, 1745), could be fully understood by a double mechanism within the twisting ICT model. Within the set of investigated molecules, our calculations confirm that the twisting ICT model is the only mechanism acceptable to explain the dual and nondual fluorescence phenomenon. Our calculations are in complete agreement with experimental data.
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Cai ZL, Sendt K, Reimers JR. Failure of density-functional theory and time-dependent density-functional theory for large extended π systems. J Chem Phys 2002. [DOI: 10.1063/1.1501131] [Citation(s) in RCA: 282] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Hessler P, Maitra NT, Burke K. Correlation in time-dependent density-functional theory. J Chem Phys 2002. [DOI: 10.1063/1.1479349] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Jamorski C, Foresman JB, Thilgen C, Lüthi HP. Assessment of time-dependent density-functional theory for the calculation of critical features in the absorption spectra of a series of aromatic donor–acceptor systems. J Chem Phys 2002. [DOI: 10.1063/1.1465404] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Chen WC, Yu CH. The potential energy surface of excited states by time-dependent density functional theory: The reaction of sulfur atom and nitrogen dioxide. J Chem Phys 2001. [DOI: 10.1063/1.1405119] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Chillier X, Boulet P, Chermette H, Salama F, Weber J. Absorption and emission spectroscopy of matrix-isolated benzo[g,h,i]perylene: An experimental and theoretical study for astrochemical applications. J Chem Phys 2001. [DOI: 10.1063/1.1376632] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Matsuzawa NN, Ishitani A, Dixon DA, Uda T. Time-Dependent Density Functional Theory Calculations of Photoabsorption Spectra in the Vacuum Ultraviolet Region. J Phys Chem A 2001. [DOI: 10.1021/jp003937v] [Citation(s) in RCA: 210] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nobuyuki N. Matsuzawa
- Atsugi Research Center, Association of Super-advanced Electronics Technologies (ASET), c/o NTT Atsugi Research and Development Center, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan
| | - Akihiko Ishitani
- Atsugi Research Center, Association of Super-advanced Electronics Technologies (ASET), c/o NTT Atsugi Research and Development Center, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan
| | - David A. Dixon
- William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, MSIN: K1-83, P.O. Box 999, 902 Battelle Boulevard, Richland, Washington 99352
| | - Tsuyoshi Uda
- Joint Research Center for Atom Technology (JRCAT), Angstrom Technology Partnership, c/o National Institute for Advanced Interdisciplinary Research, 1-1-4 Higashi, Tsukuba 305-0046, Japan
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Gritsenko OV, van Gisbergen SJA, Görling A, Baerends EJ. Excitation energies of dissociating H2: A problematic case for the adiabatic approximation of time-dependent density functional theory. J Chem Phys 2000. [DOI: 10.1063/1.1318750] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Cai ZL, Tozer DJ, Reimers JR. Time-dependent density-functional determination of arbitrary singlet and triplet excited-state potential energy surfaces: Application to the water molecule. J Chem Phys 2000. [DOI: 10.1063/1.1312826] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Casida ME, Gutierrez F, Guan J, Gadea FX, Salahub D, Daudey JP. Charge-transfer correction for improved time-dependent local density approximation excited-state potential energy curves: Analysis within the two-level model with illustration for H2 and LiH. J Chem Phys 2000. [DOI: 10.1063/1.1313558] [Citation(s) in RCA: 215] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Affiliation(s)
- Zheng-Li Cai
- School of Chemistry, University of Sydney, NSW 2006, Australia
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