1
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Fitzpatrick A, Nykänen A, Talarico NW, Lunghi A, Maniscalco S, García-Pérez G, Knecht S. Self-Consistent Field Approach for the Variational Quantum Eigensolver: Orbital Optimization Goes Adaptive. J Phys Chem A 2024; 128:2843-2856. [PMID: 38547028 DOI: 10.1021/acs.jpca.3c05882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
We present a self-consistent field (SCF) approach within the adaptive derivative-assembled problem-tailored ansatz variational quantum eigensolver (ADAPT-VQE) framework for efficient quantum simulations of chemical systems on near-term quantum computers. To this end, our ADAPT-VQE-SCF approach combines the idea of generating an ansatz with a small number of parameters, resulting in shallow-depth quantum circuits with a direct minimization of an energy expression that is correct to second order with respect to changes in the molecular orbital basis. Our numerical analysis, including calculations for the transition-metal complex ferrocene [Fe (C5H5)2], indicates that convergence in the self-consistent orbital optimization loop can be reached without a considerable increase in the number of two-qubit gates in the quantum circuit by comparison to a VQE optimization in the initial molecular orbital basis. Moreover, the orbital optimization can be carried out simultaneously within each iteration of the ADAPT-VQE cycle. ADAPT-VQE-SCF thus allows us to implement a routine analogous to the complete active space SCF, a cornerstone of state-of-the-art computational chemistry, in a hardware-efficient manner on near-term quantum computers. Hence, ADAPT-VQE-SCF paves the way toward a paradigm shift for quantitative quantum-chemistry simulations on quantum computers by requiring fewer qubits and opening up for the use of large and flexible atomic orbital basis sets in contrast to earlier methods that are predominantly based on the idea of full active spaces with minimal basis sets.
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Affiliation(s)
- Aaron Fitzpatrick
- Algorithmiq Ltd, Kanavakatu 3C, Helsinki FI-00160, Finland
- Trinity Quantum Alliance, Unit 16, Trinity Technology and Enterprise Centre, Pearse Street, Dublin 2 D02 YN67, Ireland
| | - Anton Nykänen
- Algorithmiq Ltd, Kanavakatu 3C, Helsinki FI-00160, Finland
| | | | - Alessandro Lunghi
- School of Physics, AMBER and CRANN Institute, Trinity College, Dublin 2, Ireland
| | | | | | - Stefan Knecht
- Algorithmiq Ltd, Kanavakatu 3C, Helsinki FI-00160, Finland
- ETH Zürich, Department of Chemistry and Applied Life Sciences Vladimir-Prelog-Weg 1-5/10, Zürich 8093, Switzerland
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2
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Montenegro-Pohlhammer N, Cárdenas-Jirón G, Calzado CJ. Voltage-induced modulation of the magnetic exchange in binuclear Fe(III) complex deposited on Au(111) surface. Dalton Trans 2024; 53:6264-6274. [PMID: 38506048 DOI: 10.1039/d4dt00580e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
We present a complete computational study devoted to the deposition of a magnetic binuclear complex on a metallic surface, aimed to obtain insight into the interaction of magnetically coupled complexes with their supporting substrates, as well as their response to external electrical stimuli applied through a surface-molecule-STM molecular junction-like architecture. Our results not only show that the deposition is favorable in two of the four studied orientations, but also, that the magnetic coupling is only slightly perturbed once the complex is adsorbed. We observe that the effects of the applied bias voltage on the magnetic coupling strongly depend on the molecule orientation with respect to the surface and the voltage polarity. Further analysis shows that this behavior is attributable to the stabilization/destabilization of the d-type singly occupied orbitals of the iron centers, reinforced by the strong local electric fields and induced charge densities only present in certain orientations of the deposited molecule and applied voltage polarity.
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Affiliation(s)
- Nicolás Montenegro-Pohlhammer
- Escuela de Ingeniería Civil, Facultad de Ingeniería, Ciencia y Tecnología, Universidad Bernardo O'Higgins, Santiago, Chile.
- Universidad Bernardo OHiggins, Centro Integrativo de Biología y Química Aplicada (CIBQA), General Gana 1702, Santiago, Chile
| | - Gloria Cárdenas-Jirón
- Laboratory of Theoretical Chemistry, Faculty of Chemistry and Biology, University of Santiago de Chile (USACH), Santiago, Chile
| | - Carmen J Calzado
- Departamento de Química Física. Universidad de Sevilla, c/Prof. García González, s/n 41012, Sevilla, Spain
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3
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Safari AA, Anderson RJ, Manni GL. Toward a Stochastic Complete Active Space Second-Order Perturbation Theory. J Phys Chem A 2024; 128:281-291. [PMID: 38154124 PMCID: PMC10788896 DOI: 10.1021/acs.jpca.3c05109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 11/14/2023] [Accepted: 11/14/2023] [Indexed: 12/30/2023]
Abstract
In this work, an internally contracted stochastic complete active space second-order perturbation theory, stochastic-CASPT2, is reported. The method relies on stochastically sampled reduced density matrices (RDMs) up to rank four and contractions thereof with the generalized Fock matrix. A new protocol for calculating higher-order RDMs in full configuration interaction quantum Monte Carlo (FCIQMC) has been designed based on (1) restricting sampling of the corresponding excitations to a deterministic subspace, (2) averaging the RDMs from independent dynamics and (3) projecting them onto the closest positive semi-definite matrix. Our protocol avoids previously encountered numerical conditioning problems in the orthogonalization of the perturber overlap matrix stemming from numerical noise. The chromium dimer CASSCF(12,12)/CASPT2 binding curve is computed as a proof of concept.
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Affiliation(s)
- Arta A. Safari
- Max-Planck-Institute for Solid State
Research, 70569 Stuttgart, Germany
| | | | - Giovanni Li Manni
- Max-Planck-Institute for Solid State
Research, 70569 Stuttgart, Germany
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4
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Liu H, Zhang K, Zou H, Mu Q, Wang X, Song Y, Lin L, Wang C, Fan J. Theoretical Perspective for the Relationship Between Structures and Luminescent Properties of Red Thermally Activated Delayed Fluorescence Molecules. Phys Chem Chem Phys 2022; 24:17140-17154. [DOI: 10.1039/d2cp01574a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Orange and red thermally activated delayed fluorescence (TADF) emitters have shown promising applications in organic light emitting diodes (OLEDs) and bio-medical field. However, both the species and amounts of orange...
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5
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Dobrautz W, Weser O, Bogdanov NA, Alavi A, Li Manni G. Spin-Pure Stochastic-CASSCF via GUGA-FCIQMC Applied to Iron-Sulfur Clusters. J Chem Theory Comput 2021; 17:5684-5703. [PMID: 34469685 PMCID: PMC8444347 DOI: 10.1021/acs.jctc.1c00589] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Indexed: 11/28/2022]
Abstract
In this work, we demonstrate how to efficiently compute the one- and two-body reduced density matrices within the spin-adapted full configuration interaction quantum Monte Carlo (FCIQMC) method, which is based on the graphical unitary group approach (GUGA). This allows us to use GUGA-FCIQMC as a spin-pure configuration interaction (CI) eigensolver within the complete active space self-consistent field (CASSCF) procedure and hence to stochastically treat active spaces far larger than conventional CI solvers while variationally relaxing orbitals for specific spin-pure states. We apply the method to investigate the spin ladder in iron-sulfur dimer and tetramer model systems. We demonstrate the importance of the orbital relaxation by comparing the Heisenberg model magnetic coupling parameters from the CASSCF procedure to those from a CI-only (CASCI) procedure based on restricted open-shell Hartree-Fock orbitals. We show that the orbital relaxation differentially stabilizes the lower-spin states, thus enlarging the coupling parameters with respect to the values predicted by ignoring orbital relaxation effects. Moreover, we find that, while CASCI results are well fit by a simple bilinear Heisenberg Hamiltonian, the CASSCF eigenvalues exhibit deviations that necessitate the inclusion of biquadratic terms in the model Hamiltonian.
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Affiliation(s)
- Werner Dobrautz
- Max
Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
| | - Oskar Weser
- Max
Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
| | - Nikolay A. Bogdanov
- Max
Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
| | - Ali Alavi
- Max
Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, Lensfield
Road, Cambridge CB2 1EW, United Kingdom
| | - Giovanni Li Manni
- Max
Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
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6
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Stein CJ, Pantazis DA, Krewald V. Orbital Entanglement Analysis of Exchange-Coupled Systems. J Phys Chem Lett 2019; 10:6762-6770. [PMID: 31613637 DOI: 10.1021/acs.jpclett.9b02417] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A new tool for the interpretation of multiconfigurational wave functions representing the spin states of exchange-coupled transition metal complexes is introduced. Based on orbital entanglement measures, herein derived from multiconfigurational density matrix renormalization group calculations, the complexity of the wave function is reduced, thus facilitating a connection with established concepts for the interpretation of magnetically coupled systems. We show that the entanglement of localized orbitals with a small basis set is a good representation of the magnetic coupling topology and that it is sensitive to chemical changes in homologous complexes. Furthermore, we introduce a measure for the magnetic relevance of orbitals in the active subspace and a concept for the quantitative comparison of different chemical species. The approach presented here will be easily applicable to higher nuclearity clusters, providing a direct insight into all states of the Heisenberg spin ladder for systems previously accessible only by single-configurational methods.
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Affiliation(s)
- Christopher J Stein
- Department of Chemistry , University of California , Berkeley , California 94720 , United States
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Dimitrios A Pantazis
- Max-Planck-Institut für Kohlenforschung , Kaiser-Wilhelm-Platz 1 , 45470 Mülheim an der Ruhr , Germany
| | - Vera Krewald
- Technische Universität Darmstadt , Fachbereich Chemie, Theoretische Chemie , Alarich-Weiss-Str. 4 , 64287 Darmstadt , Germany
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7
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Giner E, Tew DP, Garniron Y, Alavi A. Interplay between Electronic Correlation and Metal–Ligand Delocalization in the Spectroscopy of Transition Metal Compounds: Case Study on a Series of Planar Cu2+ Complexes. J Chem Theory Comput 2018; 14:6240-6252. [DOI: 10.1021/acs.jctc.8b00591] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Emmanuel Giner
- Laboratoire de Chimie théorique, Sorbonne Universit, UMR 7616, 4 place Jussieu, 75252 Paris, France
| | - David P. Tew
- Max Planck Institute for Solid State Research, Heisenbergstraβe 1, 70569 Stuttgart, Germany
| | - Yann Garniron
- Laboratoire de Chimie et Physique Quantique, UMR 5626, Universit Paul Sabatier, 118 route de Narbonne 31062 Toulouse, France
| | - Ali Alavi
- Max Planck Institute for Solid State Research, Heisenbergstraβe 1, 70569 Stuttgart, Germany
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8
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Montenegro-Pohlhammer N, Páez-Hernández D, Calzado CJ, Arratia-Pérez R. A theoretical study of the super exchange mechanism and magneto-structural relationships in the [Mn(iii)2(μ-F)F4(Me3tacn)2](PF6) coordination compound. NEW J CHEM 2018. [DOI: 10.1039/c8nj02793e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A detailed theoretical study of the electronic structure and magnetic properties of the dinuclear Mn(iii) complex, [Mn(iii)2(μ-F)F4(Me3tacn)2] (complex 1), with a single fluoride bridge is reported.
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Affiliation(s)
| | - Dayán Páez-Hernández
- Relativistic Molecular Physics Group (ReMoPh)
- Universidad Andrés Bello
- Santiago
- Chile
| | - Carmen J. Calzado
- Departamento de Química Física
- Universidad de Sevilla
- 41012 Sevilla
- Spain
| | - Ramiro Arratia-Pérez
- Relativistic Molecular Physics Group (ReMoPh)
- Universidad Andrés Bello
- Santiago
- Chile
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9
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Barone V, Cacelli I, Ferretti A. The role of the multiconfigurational character of nitronyl-nitroxide in the singlet–triplet energy gap of its diradicals. Phys Chem Chem Phys 2018; 20:18547-18555. [DOI: 10.1039/c8cp02165a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
CAS(2,2) reference may not be sufficient for the computation of singlet–triplet energy gap by DDCI.
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Affiliation(s)
| | - Ivo Cacelli
- Dipartimento di Chimica e Chimica Industriale
- Università di Pisa
- Pisa
- Italy
- Istituto di Chimica dei Composti OrganoMetallici (ICCOM-CNR)
| | - Alessandro Ferretti
- Istituto di Chimica dei Composti OrganoMetallici (ICCOM-CNR)
- Area della Ricerca
- I-56124 Pisa
- Italy
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10
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Pathak S, Lang L, Neese F. A dynamic correlation dressed complete active space method: Theory, implementation, and preliminary applications. J Chem Phys 2017; 147:234109. [DOI: 10.1063/1.5017942] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- Shubhrodeep Pathak
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstr. 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Lucas Lang
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstr. 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Frank Neese
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstr. 34-36, D-45470 Mülheim an der Ruhr, Germany
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11
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Roemelt M, Krewald V, Pantazis DA. Exchange Coupling Interactions from the Density Matrix Renormalization Group and N-Electron Valence Perturbation Theory: Application to a Biomimetic Mixed-Valence Manganese Complex. J Chem Theory Comput 2017; 14:166-179. [PMID: 29211960 DOI: 10.1021/acs.jctc.7b01035] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The accurate description of magnetic level energetics in oligonuclear exchange-coupled transition-metal complexes remains a formidable challenge for quantum chemistry. The density matrix renormalization group (DMRG) brings such systems for the first time easily within reach of multireference wave function methods by enabling the use of unprecedentedly large active spaces. But does this guarantee systematic improvement in predictive ability and, if so, under which conditions? We identify operational parameters in the use of DMRG using as a test system an experimentally characterized mixed-valence bis-μ-oxo/μ-acetato Mn(III,IV) dimer, a model for the oxygen-evolving complex of photosystem II. A complete active space of all metal 3d and bridge 2p orbitals proved to be the smallest meaningful starting point; this is readily accessible with DMRG and greatly improves on the unrealistic metal-only configuration interaction or complete active space self-consistent field (CASSCF) values. Orbital optimization is critical for stabilizing the antiferromagnetic state, while a state-averaged approach over all spin states involved is required to avoid artificial deviations from isotropic behavior that are associated with state-specific calculations. Selective inclusion of localized orbital subspaces enables probing the relative contributions of different ligands and distinct superexchange pathways. Overall, however, full-valence DMRG-CASSCF calculations fall short of providing a quantitative description of the exchange coupling owing to insufficient recovery of dynamic correlation. Quantitatively accurate results can be achieved through a DMRG implementation of second order N-electron valence perturbation theory (NEVPT2) in conjunction with a full-valence metal and ligand active space. Perspectives for future applications of DMRG-CASSCF/NEVPT2 to exchange coupling in oligonuclear clusters are discussed.
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Affiliation(s)
- Michael Roemelt
- Lehrstuhl für Theoretische Chemie, Ruhr-University Bochum , 44780 Bochum, Germany.,Max Planck Institute for Coal Research, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Vera Krewald
- Department of Chemistry, University of Bath , Bath BA2 7AY, United Kingdom
| | - Dimitrios A Pantazis
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
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12
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Jung J, Puget M, Cador O, Bernot K, Calzado CJ, Le Guennic B. Analysis of the Magnetic Exchange Interactions in Yttrium(III) Complexes Containing Nitronyl Nitroxide Radicals. Inorg Chem 2017; 56:6788-6801. [PMID: 28558238 DOI: 10.1021/acs.inorgchem.6b02952] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Julie Jung
- Institut des Sciences Chimiques
de Rennes, UMR 6226 CNRS, Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Cedex Rennes, France
| | - Marin Puget
- INSA Rennes, Institut des Sciences Chimiques de Rennes, UMR CNRS
6226, 35708 Rennes, France
| | - Olivier Cador
- Institut des Sciences Chimiques
de Rennes, UMR 6226 CNRS, Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Cedex Rennes, France
| | - Kevin Bernot
- INSA Rennes, Institut des Sciences Chimiques de Rennes, UMR CNRS
6226, 35708 Rennes, France
| | - Carmen J. Calzado
- Departamento de Química Física, Universidad de Sevilla, c/Prof. García González, s/n., 41012 Sevilla, Spain
| | - Boris Le Guennic
- Institut des Sciences Chimiques
de Rennes, UMR 6226 CNRS, Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Cedex Rennes, France
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13
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Barone V, Cacelli I, Ferretti A, Prampolini G. Magnetic gaps in organic tri-radicals: From a simple model to accurate estimates. J Chem Phys 2017; 146:104103. [DOI: 10.1063/1.4977598] [Citation(s) in RCA: 3] [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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14
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Barone V, Cacelli I, Ferretti A, Prampolini G. Quantitative prediction and interpretation of spin energy gaps in polyradicals: the virtual magnetic balance. Phys Chem Chem Phys 2017; 19:9039-9044. [DOI: 10.1039/c7cp00186j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Open-shell organic molecules possessing more than two unpaired electrons and sufficient stability at room temperature are very unusual, but some of them were recently synthesized and promise a number of fascinating applications.
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Affiliation(s)
| | - Ivo Cacelli
- Dipartimento di Chimica e Chimica Industriale
- Università di Pisa
- Pisa
- Italy
- Istituto di Chimica dei Composti OrganoMetallici (ICCOM-CNR)
| | - Alessandro Ferretti
- Istituto di Chimica dei Composti OrganoMetallici (ICCOM-CNR)
- Area della Ricerca
- I-56124 Pisa
- Italy
| | - Giacomo Prampolini
- Istituto di Chimica dei Composti OrganoMetallici (ICCOM-CNR)
- Area della Ricerca
- I-56124 Pisa
- Italy
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15
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Mayhall NJ. From Model Hamiltonians to ab Initio Hamiltonians and Back Again: Using Single Excitation Quantum Chemistry Methods To Find Multiexciton States in Singlet Fission Materials. J Chem Theory Comput 2016; 12:4263-73. [DOI: 10.1021/acs.jctc.6b00545] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Nicholas J. Mayhall
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24060, United States
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16
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Zhang D, Liu C. Electronic Structures of Anti-Ferromagnetic Tetraradicals: Ab Initio and Semi-Empirical Studies. J Chem Theory Comput 2016; 12:1714-27. [PMID: 26963572 DOI: 10.1021/acs.jctc.6b00103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The energy relationships and electronic structures of the lowest-lying spin states in several anti-ferromagnetic tetraradical model systems are studied with high-level ab initio and semi-empirical methods. The Full-CI method (FCI), the complete active space second-order perturbation theory (CASPT2), and the n-electron valence state perturbation theory (NEVPT2) are employed to obtain reference results. By comparing the energy relationships predicted from the Heisenberg and Hubbard models with ab initio benchmarks, the accuracy of the widely used Heisenberg model for anti-ferromagnetic spin-coupling in low-spin polyradicals is cautiously tested in this work. It is found that the strength of electron correlation (|U/t|) concerning anti-ferromagnetically coupled radical centers could range widely from strong to moderate correlation regimes and could become another degree of freedom besides the spin multiplicity. Accordingly, the Heisenberg-type model works well in the regime of strong correlation, which reproduces well the energy relationships along with the wave functions of all the spin states. In moderately spin-correlated tetraradicals, the results of the prototype Heisenberg model deviate severely from those of multi-reference electron correlation ab initio methods, while the extended Heisenberg model, containing four-body terms, can introduce reasonable corrections and maintains its accuracy in this condition. In the weak correlation regime, both the prototype Heisenberg model and its extended forms containing higher-order correction terms will encounter difficulties. Meanwhile, the Hubbard model shows balanced accuracy from strong to weak correlation cases and can reproduce qualitatively correct electronic structures, which makes it more suitable for the study of anti-ferromagnetic coupling in polyradical systems.
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Affiliation(s)
- Dawei Zhang
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry of the Ministry of Education (MOE), School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210093, China
| | - Chungen Liu
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry of the Ministry of Education (MOE), School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210093, China
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17
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Giner E, Angeli C. Spin density and orbital optimization in open shell systems: A rational and computationally efficient proposal. J Chem Phys 2016; 144:104104. [DOI: 10.1063/1.4943187] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- Emmanuel Giner
- Dipartimento di Scienze Chimiche e Famaceutiche, Universita di Ferrara, Via Fossato di Mortara 17, I-44121 Ferrara, Italy
| | - Celestino Angeli
- Dipartimento di Scienze Chimiche e Famaceutiche, Universita di Ferrara, Via Fossato di Mortara 17, I-44121 Ferrara, Italy
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18
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Tenti L, Maynau D, Angeli C, Calzado CJ. Highly efficient perturbative + variational strategy based on orthogonal valence bond theory for the evaluation of magnetic coupling constants. Application to the trinuclear Cu(ii) site of multicopper oxidases. Phys Chem Chem Phys 2016; 18:18365-80. [DOI: 10.1039/c6cp03234f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new perturbative + variational strategy: a low-cost, quantitative and rational evaluation of the magnetic coupling constant in complex systems.
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Affiliation(s)
- Lorenzo Tenti
- Dipartimento di Scienze Chimiche e Farmaceutiche
- Università degli Studi di Ferrara
- 44121 Ferrara
- Italy
| | - Daniel Maynau
- Laboratoire de Chimie et Physique Quantique
- IRSAMC
- Université de Toulouse
- 31062 Toulouse
- France
| | - Celestino Angeli
- Dipartimento di Scienze Chimiche e Farmaceutiche
- Università degli Studi di Ferrara
- 44121 Ferrara
- Italy
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19
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Giner E, Angeli C. Metal-ligand delocalization and spin density in the CuCl2 and [CuCl4]2− molecules: Some insights from wave function theory. J Chem Phys 2015; 143:124305. [DOI: 10.1063/1.4931639] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Emmanuel Giner
- Dipartimento di Scienze Chimiche e Famaceutiche, Universita di Ferrara, Via Fossato di Mortara 17, I-44121 Ferrara, Italy
| | - Celestino Angeli
- Dipartimento di Scienze Chimiche e Famaceutiche, Universita di Ferrara, Via Fossato di Mortara 17, I-44121 Ferrara, Italy
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20
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Domingo A, Angeli C, de Graaf C, Robert V. Electronic reorganization triggered by electron transfer: The intervalence charge transfer of a Fe3+/Fe2+bimetallic complex. J Comput Chem 2015; 36:861-9. [DOI: 10.1002/jcc.23871] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 12/17/2014] [Accepted: 01/15/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Alex Domingo
- Department of Chemistry; KU Leuven Celestijnenlaan 200F B-3001 Heverlee-Leuven Belgium
| | - Celestino Angeli
- Dipartimento di Scienze Chimiche e Farmaceutiche; Università di Ferrara; via Fossato di Mortara 17 44121 Ferrara Italy
| | - Coen de Graaf
- Departament de Química Física i Inorgànica; Universitat Rovira i Virgili; Marcel lí Domingo s/n 43007 Tarragona Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA); Passeig Lluís Companys 23 08010 Barcelona Spain
| | - Vincent Robert
- Laboratoire de Chimie Quantique; Institut de Chimie UMR 7177, Université de Strasbourg; 4 rue Blaise Pascal 67000 Strasbourg France
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22
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Novoa N, Justaud F, Hamon P, Roisnel T, Cador O, Le Guennic B, Manzur C, Carrillo D, Hamon JR. Doubly phenoxide-bridged binuclear copper(II) complexes with ono tridentate schiff base ligand: Synthesis, structural, magnetic and theoretical studies. Polyhedron 2015. [DOI: 10.1016/j.poly.2014.05.032] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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23
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Mayhall NJ, Horn PR, Sundstrom EJ, Head-Gordon M. Spin–flip non-orthogonal configuration interaction: a variational and almost black-box method for describing strongly correlated molecules. Phys Chem Chem Phys 2014; 16:22694-705. [DOI: 10.1039/c4cp02818j] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Spivak M, Angeli C, Calzado CJ, de Graaf C. Improving the calculation of magnetic coupling constants in MRPT methods. J Comput Chem 2014; 35:1665-71. [DOI: 10.1002/jcc.23672] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Revised: 05/31/2014] [Accepted: 06/05/2014] [Indexed: 01/29/2023]
Affiliation(s)
- Mariano Spivak
- Departament de Quimica Fisica i Inorgànica; Universitat Rovira i Virgili; Marcel lí Domingo s/n E-43007 Tarragona Spain
| | - Celestino Angeli
- Dipartimento di Scienze Chimiche e Famaceutiche; Università di Ferrara; Via Fossato di Mortara 17 I-44121 Ferrara Italy
| | - Carmen J. Calzado
- Departamento de Química Física; Universidad de Sevilla; c/Profesor García González s/n E-41012 Sevilla Spain
| | - Coen de Graaf
- Departament de Quimica Fisica i Inorgànica; Universitat Rovira i Virgili; Marcel lí Domingo s/n E-43007 Tarragona Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA); Passeig Lluis Companys 23 08010 Barcelona Spain
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25
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Partly saturated polyacene structures: a theoretical study. J Mol Model 2014; 20:2284. [PMID: 24969843 DOI: 10.1007/s00894-014-2284-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 04/25/2014] [Indexed: 10/25/2022]
Abstract
Planar molecular edifices obtained by joining polyacene fragments (polyacene stripes) are investigated at tight-binding (i.e., with a Hückel Hamiltonian) and ab initio level. For this kind of system, it is known that the presence of 60-degree angles between two stripes of the polyacene molecular skeleton induces the formation of singly occupied molecular orbitals, whose combination gives rise to quasi-degenerate electronic states. In particular, two types of convex polygons having a unique side length (rhombuses and triangles) are considered in this work. It is shown that the saturation via hydrogen atoms of the apical carbons located on outer borders of the 60-degree angles increases the number of quasi-degenerate orbitals, and hence the maximal multiplicity of the low-lying states of the system. Our tight-binding and ab initio (CAS-CI, NEVPT2) calculations indicate that the spin multiplicity of these molecular structures is in systematical accord with the Ovchinnikov rule.
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26
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Suaud N, Ruamps R, Malrieu JP, Guihéry N. Singly Occupied MOs in Mono- and Diradical Conjugated Hydrocarbons: Comparison between Variational Single-Reference, π-Fully Correlated and Hückel Descriptions. J Phys Chem A 2014; 118:5876-84. [DOI: 10.1021/jp4120892] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Nicolas Suaud
- Laboratoire de Chimie et Physique Quantiques, UMR 5626
CNRS, IRSAMC, Université de Toulouse III Paul Sabatier, 118
Rte de Narbonne, 31062 Toulouse Cedex, France
| | - Renaud Ruamps
- Laboratoire de Chimie et Physique Quantiques, UMR 5626
CNRS, IRSAMC, Université de Toulouse III Paul Sabatier, 118
Rte de Narbonne, 31062 Toulouse Cedex, France
| | - Jean-Paul Malrieu
- Laboratoire de Chimie et Physique Quantiques, UMR 5626
CNRS, IRSAMC, Université de Toulouse III Paul Sabatier, 118
Rte de Narbonne, 31062 Toulouse Cedex, France
| | - Nathalie Guihéry
- Laboratoire de Chimie et Physique Quantiques, UMR 5626
CNRS, IRSAMC, Université de Toulouse III Paul Sabatier, 118
Rte de Narbonne, 31062 Toulouse Cedex, France
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27
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Krah T, Amor NB, Robert V. Switching magnetic interactions in the NiFe Prussian Blue Analogue: an ab initio inspection. Phys Chem Chem Phys 2014; 16:9509-14. [DOI: 10.1039/c4cp00662c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Wave function embedded cluster calculations are performed to stress a cation-coupled electron transfer process in the NiFe Prussian Blue Analogue.
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Affiliation(s)
- Tim Krah
- Laboratoire de Chimie Quantique
- Université de Strasbourg
- 67000 Strasbourg, France
| | - Nadia Ben Amor
- Laboratoire de Chimie et Physique Quantiques
- 31062 Toulouse Cedex 09, France
| | - Vincent Robert
- Laboratoire de Chimie Quantique
- Université de Strasbourg
- 67000 Strasbourg, France
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28
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Sharma RP, Saini A, Venugopalan P, Ferretti V, Spizzo F, Angeli C, Calzado CJ. Magnetic behaviour vs. structural changes in an isomeric series of binuclear copper(ii) complexes: an experimental and theoretical study. NEW J CHEM 2014. [DOI: 10.1039/c3nj01080e] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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29
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Malrieu JP, Caballol R, Calzado CJ, de Graaf C, Guihéry N. Magnetic interactions in molecules and highly correlated materials: physical content, analytical derivation, and rigorous extraction of magnetic Hamiltonians. Chem Rev 2013; 114:429-92. [PMID: 24102410 DOI: 10.1021/cr300500z] [Citation(s) in RCA: 282] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Jean Paul Malrieu
- Laboratoire de Chimie et Physique Quantiques, Université de Toulouse 3 , 118 route de Narbonne, 31062 Toulouse, France
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30
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Barone V, Boilleau C, Cacelli I, Ferretti A, Prampolini G. Conformational Effects on the Magnetic Properties of an Organic Diradical: A Computational Study. J Chem Theory Comput 2013; 9:1958-63. [DOI: 10.1021/ct400020x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vincenzo Barone
- Scuola Normale Superiore, Piazza
dei Cavalieri, I-56126 Pisa, Italy
| | | | - Ivo Cacelli
- Dipartimento di Chimica e Chimica
Industriale, Università di Pisa, Via Risorgimento 35, 56126
Pisa, Italy
| | - Alessandro Ferretti
- Istituto di Chimica
dei Composti
OrganoMetallici del CNR, Area della Ricerca di Pisa, Via G. Moruzzi
1, I-56122 Pisa, Italy
| | - Giacomo Prampolini
- Istituto per i Processi Chimico-Fisici
(IPCF-CNR), Area della Ricerca, via G. Moruzzi 1, I-56124 Pisa, Italy
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31
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Angeli C, Cimiraglia R, Malrieu JP. Non-orthogonal and orthogonal valence bond wavefunctions in the hydrogen molecule: the diabatic view. Mol Phys 2013. [DOI: 10.1080/00268976.2013.771803] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Celestino Angeli
- a Dipartimento di Scienze Chimiche e Farmaceutiche , Università di Ferrara , Ferrara , Italy
| | - Renzo Cimiraglia
- a Dipartimento di Scienze Chimiche e Farmaceutiche , Università di Ferrara , Ferrara , Italy
| | - Jean-Paul Malrieu
- b Laboratoire de Chimie et Physique Quantiques , Université Paul Sabatier , Toulouse , France
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32
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Domingo A, Vérot M, Mota F, de Graaf C, Novoa JJ, Robert V. Impact of short and long-range effects on the magnetic interactions in neutral organic radical-based materials. Phys Chem Chem Phys 2013; 15:6982-9. [DOI: 10.1039/c3cp44647f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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33
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Barone V, Boilleau C, Cacelli I, Ferretti A, Monti S, Prampolini G. Structure–Properties Relationships in Triplet Ground State Organic Diradicals: A Computational Study. J Chem Theory Comput 2012; 9:300-7. [DOI: 10.1021/ct300790c] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vincenzo Barone
- Scuola Normale Superiore, piazza
dei Cavalieri 7, I-56126 Pisa, Italy
| | - Corentin Boilleau
- Scuola Normale Superiore, piazza
dei Cavalieri 7, I-56126 Pisa, Italy
| | - Ivo Cacelli
- Dipartimento di Chimica e Chimica
Industriale, Università degli Studi di Pisa, via Risorgimento
35, I-56126 Pisa, Italy
| | - Alessandro Ferretti
- Istituto
di Chimica dei Composti
OrganoMetallici (ICCOM-CNR), Area della Ricerca, via G. Moruzzi 1,
I-56124 Pisa, Italy
| | - Susanna Monti
- Scuola Normale Superiore, piazza
dei Cavalieri 7, I-56126 Pisa, Italy
- Istituto
di Chimica dei Composti
OrganoMetallici (ICCOM-CNR), Area della Ricerca, via G. Moruzzi 1,
I-56124 Pisa, Italy
| | - Giacomo Prampolini
- Istituto
per i Processi Chimico-Fisici
(IPCF-CNR), Area della Ricerca, via G. Moruzzi 1, I-56124 Pisa, Italy
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34
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Suaud N, Ruamps R, Guihéry N, Malrieu JP. A Strategy to Determine Appropriate Active Orbitals and Accurate Magnetic Couplings in Organic Magnetic Systems. J Chem Theory Comput 2012; 8:4127-37. [DOI: 10.1021/ct300577y] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Nicolas Suaud
- Laboratoire de Chimie et Physique
Quantiques, Université
Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex, France
| | - Renaud Ruamps
- Laboratoire de Chimie et Physique
Quantiques, Université
Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex, France
| | - Nathalie Guihéry
- Laboratoire de Chimie et Physique
Quantiques, Université
Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex, France
| | - Jean-Paul Malrieu
- Laboratoire de Chimie et Physique
Quantiques, Université
Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex, France
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35
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Metal-to-metal charge-transfer transitions: reliable excitation energies from ab initio calculations. Theor Chem Acc 2012. [DOI: 10.1007/s00214-012-1264-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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