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Roseiro P, Yalouz S, Brook DJR, Ben Amor N, Robert V. Modifications of Tanabe-Sugano d6 Diagram Induced by Radical Ligand Field: Ab Initio Inspection of a Fe(II)-Verdazyl Molecular Complex. Inorg Chem 2023; 62:5737-5743. [PMID: 36971364 DOI: 10.1021/acs.inorgchem.3c00275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Abstract
Quantum entanglement between the spin states of a metal center and radical ligands is suggested in an iron(II) [Fe(dipyvd)2]2+ compound (dipyvd = 1-isopropyl-3,5-dipyridil-6-oxoverdazyl). Wave function ab initio (Difference Dedicated Configuration Interaction, DDCI) inspections were carried out to stress the versatility of local spin states. We named this phenomenon excited state spinmerism, in reference to our previous work (see Roseiro et al., ChemPhysChem 2022, e202200478) where we introduced the concept of spinmerism as an extension of mesomerism to spin degrees of freedom. The construction of localized molecular orbitals allows for a reading of the wave functions and projections onto the local spin states. The low-energy spectrum is well-depicted by a Heisenberg picture. A 60 cm-1 ferromagnetic interaction is calculated between the radical ligands with the Stotal = 0 and 1 states largely dominated by a local low-spin SFe = 0. In contrast, the higher-lying Stotal = 2 states are superpositions of the local SFe = 1 (17%, 62%) and SFe = 2 (72%, 21%) spin states. Such mixing extends the traditional picture of a high-field d6 Tanabe-Sugano diagram. Even in the absence of spin-orbit coupling, the avoided crossing between different local spin states is triggered by the field generated by radical ligands. This puzzling scenario emerges from versatile local spin states in compounds which extend the traditional views in molecular magnetism.
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2
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Novitchi G, Shova S, Train C. Investigation by Chemical Substitution within 2p-3d-4f Clusters of the Cobalt(II) Role in the Magnetic Behavior of [vdCoLn] 2 (vd = Verdazyl Radical). Inorg Chem 2022; 61:17037-17048. [PMID: 36240010 DOI: 10.1021/acs.inorgchem.2c01742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
1,5-Dimethyl-3-(3'-(hydroxymethyl)-2'-pyridine)-6-oxotetrazane (H3vdpyCH2OH) or its oxidized verdazyl form (vdpyCH2OH) reacted with transition metal and/or lanthanide acetates to yield [(vdpyCH2O)2Co2Ln2(acO)8] (Ln = Y(III): ICo,Y; Gd(III): ICo,Gd), [(vdpyCH2O)2M3(acO)4] (M = Zn(II): IIZn; Co(II): IICo) and [(vdpyCH2OH)Zn(acO)2] (IIIZn) through self-assembly implying a complex-as-ligand intermediate. Single-crystal diffraction reveals that IMT,Ln are composed of 2p-3d-4f centrosymmetric clusters with verdazyl radicals at the two ends coordinated to the transition-metal ion in a tridentate mode and to the {Ln2(acO)4} lanthanide central core in a monodentate mode through its alkoxo moiety. In ICo,Gd, the transition-metal ions adopt an irregular octahedral environment, and the {Ln2(acO)4} core adopts a paddlewheel motif, whereas in ICo,Y, the transition metal is pentacoordinated, and the central core contains only two acetate bridges. Going from ICo,Y to IICo, the central {Y2(acO)4} core is replaced by an axially compressed octahedral cobalt(II) center, whereas the outer parts of the molecule remain still. The dc magnetic studies revealed that the alternate π-stacking of the verdazyl radicals in IIZn led to the formation of alternate antiferromagnetically coupled 1D chains with Jvd-vd = -8.2(1) cm-1 and Jvd-vd' = -7.6(1) cm-1 (-2J convention). In ICo,Y, a complex fitting procedure allowed us to retrieve a complete set of magnetic parameters to take into account both the magnetic anisotropy of the cobalt(II) centers and intra- and inter-molecular exchange effects. For ICo,Y, it led to gCo = 2.13(4), DCo = 100(2) cm-1, ECo = 19.9(5) cm-1, JCo-vd = +26.5(4) cm-1, and Jvd-vd = -7.95(4) cm-1. ac magnetic susceptibility of ICo,Y, ICo,Gd and IICo did not reveal any slow relaxation of the magnetization even when a dc external magnetic field up to 2000 Oe was applied.
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Affiliation(s)
- Ghénadie Novitchi
- Laboratoire National des Champs Magnétiques Intenses (LNCMI) Université Grenoble Alpes, INSA Toulouse, Université Toulouse Paul Sabatier, EMFL, CNRS F-38042 Grenoble, France
| | - Sergiu Shova
- "Petru Poni" Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Cyrille Train
- Laboratoire National des Champs Magnétiques Intenses (LNCMI) Université Grenoble Alpes, INSA Toulouse, Université Toulouse Paul Sabatier, EMFL, CNRS F-38042 Grenoble, France
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Roncero-Barrero C, Ribas-Ariño J, Deumal M, Moreira IDPR. Electronic structure and magnetic coupling in selenium substituted pyridine-bridged bisdithiazolyl multifunctional molecular materials. Phys Chem Chem Phys 2022; 24:12196-12207. [PMID: 35551353 DOI: 10.1039/d2cp00415a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Bisdithiazolyl radicals have furnished in recent years multiple examples of molecular materials with promising conductive and magnetic properties. The electronic band structure and magnetic ordering in four different isostructural pyridine-bridged bisdithiazolyl and Selenium substituted compounds have been studied by means of hybrid DFT based methods as implemented in the CRYSTAL code. The full rationalization of the properties of these multifunctional magnetic molecular materials requires a careful description of their complex open-shell electronic structure. The results describe the systems as narrow band (0.2-0.3 eV dispersion) open-shell semiconductors with a gap of 1.15-1.40 eV between the valence and conducting bands. The bands defining the insulating gap are dominated by orbital contributions arising from the heteroatoms sitting in the outer rings. A low energy closed-shell metallic solution is found at 0.25-0.35 eV above the magnetic solutions thus suggesting a complex mechanism for electric conduction with band and hopping contributions. The observed trend of the conductivity is in line with the variation of the insulating gap but more rigorous modelling is required to take into account the details of the band structure of the systems. For all the systems the spin density is well localised on the molecular units and is independent of the magnetic solution. Thus the system can be described as an ensemble of well-defined S = 1/2 magnetic centres using a two-body Heisenberg-Dirac-van Vleck spin Hamiltonian. The lowest energy electronic solutions are in line with the observed magnetic behaviour at low temperature. The set of competing magnetic exchange interactions that emerges from using a suitable mapping to consistently describe the low energy magnetic solutions explains the variety of magnetic responses (absence of long-range magnetic order, antiferromagnetism or ferromagnetism) of the four studied compounds at low temperatures.
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Affiliation(s)
- Cristina Roncero-Barrero
- Departament de Ciència de Materials i Química Física, Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain.,Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Jordi Ribas-Ariño
- Departament de Ciència de Materials i Química Física, Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain.,Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Mercè Deumal
- Departament de Ciència de Materials i Química Física, Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain.,Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Ibério de P R Moreira
- Departament de Ciència de Materials i Química Física, Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain.,Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain
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4
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Chahma M, Riopel R, Arteca G. Synthesis, characterization and modeling of stable radical functionalized monothiophenes. J Sulphur Chem 2021. [DOI: 10.1080/17415993.2021.1909590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- M’hamed Chahma
- Department of Chemistry & Biochemistry, Laurentian University, Sudbury, Canada
| | - Remi Riopel
- Department of Chemistry & Biochemistry, Laurentian University, Sudbury, Canada
| | - Gustavo Arteca
- Department of Chemistry & Biochemistry, Laurentian University, Sudbury, Canada
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5
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Chen D, Bu Y. Rational magnetic modification of N,N-dioxidized pyrazine ring expanded adenine and thymine: a diradical character induced by base pairing and double protonation. Phys Chem Chem Phys 2019; 21:20095-20106. [PMID: 31482894 DOI: 10.1039/c9cp03234g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rational modification of biomolecules especially DNA base pairs for the theoretical design of molecular magnets has attracted extensive interest. In this work, we report a modification strategy for adenine/thymine-based magnets through introducing a N,N-dioxidized pyrazine ring to either adenine or thymine to form ring-expanded bases (noA/noT) based on their experimentally synthesized derivatives. Further functionalization is conducted by double protonation and pairing with a normal complementary base (nohA-T/nohT-A), respectively. The diversity of protonation sites in noA generates totally six nohA-Ts, together with nohT-A forming seven two-step modified topic base pairs. DFT calculations are performed to characterize the magnetic properties and the diradical character, which indicate three diamagnetic (DM) nohA-Ts and three antiferromagnetic (AFM) nohA-Ts with extremely large magnetic coupling constants J ranging from -1279.7 to -2807.4 cm-1, while a relatively mild AFM nohT-A with a J of -194.6 cm-1. The electron separation effect induced by attraction of positive charges originating from protonation is proposed to explain the diradicalization, which is different from the traditional radical-coupler-radical coupling mode. In addition, atomic natural charges and spin densities, and H-bond and molecular orbital analyses are further discussed for verification and deep understanding of the observed unique phenomena. It should be noted that our designed seven topic base pairs have excellent characters including a good synthetic basis, a large scope of the |J| values, and the AFM-DM magnetic conversion or AFM strength modulation controlled by protonation/deprotonation, prototropic tautomerization, base pairing/dissociation, single proton transfer, and even the applied electric field. All these indicate the promising applications in the field of magnetic information storage or switch control. This work highlights the magnetic modification schemes and possible modulation methods of double positive charge doped DNA base pairs by utilizing their potential spin coupling modes.
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Affiliation(s)
- Dongxiao Chen
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, People's Republic of China.
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6
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Eusterwiemann S, Doerenkamp C, Dresselhaus T, Janka O, Daniliuc CG, Pöttgen R, Studer A, Eckert H, Neugebauer J. Ferro- or antiferromagnetism? Heisenberg chains in the crystal structures of verdazyl radicals. Phys Chem Chem Phys 2018; 20:22902-22908. [PMID: 30152489 DOI: 10.1039/c8cp03332c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, we address the question of the origin of ferromagnetic or antiferromagnetic interactions in alkynyl-substituted 1,5-diphenyl-6-oxo verdazyl radicals. While a TMS-alkynyl derivative (3) shows antiferromagnetic ordering at low temperatures, the corresponding deprotected alkynyl verdazyl (4) shows ferromagnetic interactions. For both compounds, magnetic Heisenberg chains are characteristic, which were studied systematically by means of X-ray crystallography and quantum chemical calculations. Ferromagnetic interactions are rarely found in such radicals. Therefore, uncovering such structure-property relationships is of crucial importance in order to understand and design promising ferromagnetic networks. Using this knowledge, we were able to design and crystallize diyne derivatives showing comparable solid state characteristics and therefore antiferro- and ferromagnetic Heisenberg chain structures. We show that the understanding of such property-structure relationships is adequate for the design of organic-magnetic materials with defined cooperative effects within the class of verdazyl radicals.
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Affiliation(s)
- Steffen Eusterwiemann
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstrasse 40, 48149 Münster, Germany.
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7
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Jobelius H, Wagner N, Schnakenburg G, Meyer A. Verdazyls as Possible Building Blocks for Multifunctional Molecular Materials: A Case Study on 1,5-Diphenyl-3-( p-iodophenyl)-verdazyl Focusing on Magnetism, Electron Transfer and the Applicability of the Sonogashira-Hagihara Reaction. Molecules 2018; 23:E1758. [PMID: 30021960 PMCID: PMC6100452 DOI: 10.3390/molecules23071758] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 07/15/2018] [Accepted: 07/16/2018] [Indexed: 11/16/2022] Open
Abstract
This work explores the use of Kuhn verdazyl radicals as building blocks in multifunctional molecular materials in an exemplary study, focusing on the magnetic and the electron transfer (ET) characteristics, but also addressing the question whether chemical modification by cross-coupling is possible. The ET in solution is studied spectroscopically, whereas solid state measurements afford information about the magnetic susceptibility or the conductivity of the given samples. The observed results are rationalized based on the chemical structures of the molecules, which have been obtained by X-ray crystallography. The crystallographically observed molecular structures as well as the interpretation based on the spectroscopic and physical measurements are backed up by DFT calculations. The measurements indicate that only weak, antiferromagnetic (AF) coupling is observed in Kuhn verdazyls owed to the low tendency to form face-to-face stacks, but also that steric reasons alone are not sufficient to explain this behavior. Furthermore, it is also demonstrated that ET reactions proceed rapidly in verdazyl/verdazylium redox couples and that Kuhn verdazyls are suited as donor molecules in ET reactions.
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Affiliation(s)
- Hannah Jobelius
- Institute of Physical and Theoretical Chemistry, University of Bonn, 53115 Bonn, Germany.
| | - Norbert Wagner
- Institute of Inorganic Chemistry, University of Bonn, 53121 Bonn, Germany.
| | | | - Andreas Meyer
- Institute of Physical and Theoretical Chemistry, University of Bonn, 53115 Bonn, Germany.
- Max-Planck-Institute for Biophysical Chemistry, 37077 Göttingen, Germany.
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8
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Calzado CJ, Rodríguez-García B, Galán Mascarós JR, Hernández NC. Electronic Structure and Magnetic Interactions in the Radical Salt [BEDT-TTF] 2[CuCl 4]. Inorg Chem 2018; 57:7077-7089. [PMID: 29877697 DOI: 10.1021/acs.inorgchem.7b03240] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The magnetic behavior and electric properties of the hybrid radical salt [BEDT-TTF]2[CuCl4] have been revisited through extended experimental analyses and DDCI and periodic DFT plane waves calculations. Single crystal X-ray diffraction data have been collected at different temperatures, discovering a phase transition occurring in the 250-300 K range. The calculations indicate the presence of intradimer, interdimer, and organic-inorganic π-d interactions in the crystal, a magnetic pattern much more complex than the Bleaney-Bowers model initially assigned to this material. Although this simple model was good enough to reproduce the magnetic susceptibility data, our calculations demonstrate that the actual magnetic structure is significantly more intricate, with alternating antiferromagnetic 1D chains of the organic BEDT-TTF+ radical, connected through weak antiferromagnetic interactions with the CuCl42- ions. Combination of experiment and theory allowed us to unambiguously determine and quantify the leading magnetic interactions in the system. The density-of-states curves confirm the semiconductor nature of the system and the dominant organic contribution of the valence and conduction band edges. This general and combined approach appears to be fundamental in order to properly understand the magnetic structure of these complex materials, where experimental data can actually be fitted from a variety of models and parameters.
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Affiliation(s)
- Carmen J Calzado
- Departamento de Química Física , Universidad de Sevilla , c/Profesor García González, s/n , E-41012 , Sevilla , Spain
| | - Bárbara Rodríguez-García
- Institute of Chemical Research of Catalonia (ICIQ) , The Barcelona Institute of Science and Technology (BIST) , Av. Països Catalans, 16 , Tarragona , E-43007 , Spain
| | - José Ramón Galán Mascarós
- Institute of Chemical Research of Catalonia (ICIQ) , The Barcelona Institute of Science and Technology (BIST) , Av. Països Catalans, 16 , Tarragona , E-43007 , Spain.,ICREA , Pg. Lluís Companys, 23 , E-08010 , Barcelona , Spain
| | - Norge Cruz Hernández
- Departamento de Física Aplicada I, Escuela Politécnica Superior , Universidad de Sevilla , Sevilla , E-41011 , Spain
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9
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Gourlaouen C, Vela S, Choua S, Berville M, Wytko JA, Weiss J, Robert V. Pairing-up viologen cations and dications: a microscopic investigation of van der Waals interactions. Phys Chem Chem Phys 2018; 20:27878-27884. [DOI: 10.1039/c8cp04543g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Polarizability and simultaneous environment effects overcome Coulomb repulsions.
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Affiliation(s)
- Christophe Gourlaouen
- Laboratoire de Chimie Quantique
- UMR 7111
- CNRS-Université de Strasbourg
- F-67000 Strasbourg
- France
| | - Sergi Vela
- Laboratoire de Chimie Quantique
- UMR 7111
- CNRS-Université de Strasbourg
- F-67000 Strasbourg
- France
| | - Sylvie Choua
- Laboratoire de Propriétés Optiques et Magnétiques des Architectures Moléculaires
- UMR 7111
- CNRS-Université de Strasbourg
- F-67000 Strasbourg
- France
| | - Mathilde Berville
- Laboratoire de Chimie des Ligands à Architecture Contrôlée
- UMR 7111
- CNRS-Université de Strasbourg
- F-67000 Strasbourg
- France
| | - Jennifer A. Wytko
- Laboratoire de Chimie des Ligands à Architecture Contrôlée
- UMR 7111
- CNRS-Université de Strasbourg
- F-67000 Strasbourg
- France
| | - Jean Weiss
- Laboratoire de Chimie des Ligands à Architecture Contrôlée
- UMR 7111
- CNRS-Université de Strasbourg
- F-67000 Strasbourg
- France
| | - Vincent Robert
- Laboratoire de Chimie Quantique
- UMR 7111
- CNRS-Université de Strasbourg
- F-67000 Strasbourg
- France
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10
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Francese T, Ribas-Arino J, Novoa JJ, Havenith RW, Broer R, de Graaf C, Deumal M. The magnetic fingerprint of dithiazolyl-based molecule magnets. Phys Chem Chem Phys 2018; 20:20406-20416. [DOI: 10.1039/c8cp03173h] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ferromagnetic fingerprint of dithiazolyl-based molecule materials is uncovered. Interestingly geometrical rather than electronic structure factors play the leading role.
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Affiliation(s)
- Tommaso Francese
- Dept. Ciència de Materials i Química Física
- Secció Química Física & IQTCUB
- Universitat de Barcelona
- Barcelona
- Spain
| | - Jordi Ribas-Arino
- Dept. Ciència de Materials i Química Física
- Secció Química Física & IQTCUB
- Universitat de Barcelona
- Barcelona
- Spain
| | - Juan J. Novoa
- Dept. Ciència de Materials i Química Física
- Secció Química Física & IQTCUB
- Universitat de Barcelona
- Barcelona
- Spain
| | - Remco W.A. Havenith
- Theoretical Chemistry
- Zernike Institute for Advance Materials
- University of Groningen
- 9747 AG Groningen
- The Netherlands
| | - Ria Broer
- Theoretical Chemistry
- Zernike Institute for Advance Materials
- University of Groningen
- 9747 AG Groningen
- The Netherlands
| | - Coen de Graaf
- Theoretical Chemistry
- Zernike Institute for Advance Materials
- University of Groningen
- 9747 AG Groningen
- The Netherlands
| | - Mercè Deumal
- Dept. Ciència de Materials i Química Física
- Secció Química Física & IQTCUB
- Universitat de Barcelona
- Barcelona
- Spain
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11
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Arcelus O, Suaud N, Katcho NA, Carrasco J. Insight from first principles into the stability and magnetism of alkali-metal superoxide nanoclusters. J Chem Phys 2017. [DOI: 10.1063/1.4982891] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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12
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Pal AK, Datta SN. Ferrocene-based diradicals of imino nitroxide, nitronyl nitroxide and verdazyl, and their cations are possible SMM: A quantum chemical study. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.03.043] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Berville M, Choua S, Gourlaouen C, Boudon C, Ruhlmann L, Bailly C, Cobo S, Saint-Aman E, Wytko J, Weiss J. Flexible Viologen Cyclophanes: Odd/Even Effects on Intramolecular Interactions. Chemphyschem 2017; 18:796-803. [PMID: 28052477 DOI: 10.1002/cphc.201700011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Indexed: 11/10/2022]
Abstract
The ability of three bis-viologen cyclophanes to act as redox-triggered contractile switches is investigated. Odd/even effects in the formation of cyclic bis-viologens are circumvented by the use of a Zincke salt intermediate and a tetrathiafulvalene template to prepare a flexible cyclophane with hexyl linkers. Comparative spectro-electrochemical studies of this macrocycle with two other pentyl- or heptyl-linked cyclic bis-viologens show that the development of intramolecular interactions in aqueous solution depends on the length of the bridges. This dependence is confirmed by EPR and DFT studies of the magnetic coupling in the diradical dication species. The anti-ferromagnetic or ferromagnetic nature of the coupling depend, respectively, on the odd or even number of methylene groups in the spacer.
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Affiliation(s)
- Mathilde Berville
- Laboratoire de Chimie des Ligands à Architecture Contrôlée, Institut de Chimie, UMR 7177, CNRS-Université de Strasbourg, 4 rue Blaise Pascal, 67008, Strasbourg, France
| | - Sylvie Choua
- Laboratoire de Propriétés Optiques et Magnétiques des Architectures Moléculaires, Institut de Chimie, UMR 7177, CNRS-Université de Strasbourg, 4 rue Blaise Pascal, 67008, Strasbourg, France
| | - Christophe Gourlaouen
- Laboratoire de Chimie Quantique, Institut de Chimie, UMR 7177, CNRS-Université de Strasbourg, 1 rue Blaise Pascal, 67008, Strasbourg, France
| | - Corinne Boudon
- Laboratoire d'Electrochimie et Chimie Physique du Corps Solide, Institut de Chimie, UMR 7177, CNRS-Université de Strasbourg, 4 rue Blaise Pascal, 67008, Strasbourg, France
| | - Laurent Ruhlmann
- Laboratoire d'Electrochimie et Chimie Physique du Corps Solide, Institut de Chimie, UMR 7177, CNRS-Université de Strasbourg, 4 rue Blaise Pascal, 67008, Strasbourg, France
| | - Corinne Bailly
- Service de Cristallographie, GDS 3648, CNRS-Université de Strasbourg, 1 rue Blaise Pascal, 67008, Strasbourg, France
| | - Saioa Cobo
- Département de Chimie Moléculaire, UMR 5250, Laboratoire de Chimie Inorganique Rédox, Université Grenoble Alpes, 38000, Grenoble, France
| | - Eric Saint-Aman
- Département de Chimie Moléculaire, UMR 5250, Laboratoire de Chimie Inorganique Rédox, Université Grenoble Alpes, 38000, Grenoble, France
| | - Jennifer Wytko
- Laboratoire de Chimie des Ligands à Architecture Contrôlée, Institut de Chimie, UMR 7177, CNRS-Université de Strasbourg, 4 rue Blaise Pascal, 67008, Strasbourg, France
| | - Jean Weiss
- Laboratoire de Chimie des Ligands à Architecture Contrôlée, Institut de Chimie, UMR 7177, CNRS-Université de Strasbourg, 4 rue Blaise Pascal, 67008, Strasbourg, France
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14
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Trinquier G, Malrieu JP. Spreading out spin density in polyphenalenyl radicals. Phys Chem Chem Phys 2017; 19:27623-27642. [DOI: 10.1039/c7cp04930g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Properly-designed monoradicals built from polycondensed phenalene units can enforce flattening of spin distributions.
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Affiliation(s)
- Georges Trinquier
- Laboratoire de Chimie et Physique Quantiques (CNRS-UMR5626)
- IRSAMC
- Université Paul-Sabatier (Toulouse III)
- 31062 Toulouse Cedex
- France
| | - Jean-Paul Malrieu
- Laboratoire de Chimie et Physique Quantiques (CNRS-UMR5626)
- IRSAMC
- Université Paul-Sabatier (Toulouse III)
- 31062 Toulouse Cedex
- France
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15
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Dresselhaus T, Eusterwiemann S, Matuschek DR, Daniliuc CG, Janka O, Pöttgen R, Studer A, Neugebauer J. Black-box determination of temperature-dependent susceptibilities for crystalline organic radicals with complex magnetic topologies. Phys Chem Chem Phys 2016; 18:28262-28273. [PMID: 27711591 DOI: 10.1039/c6cp05875b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In all but the simplest crystal structures, the identification of all relevant interactions between magnetic sites as well as the setup of magnetic model spaces, which are necessary for modeling macroscopic magnetism, are tedious and error-prone tasks. Here, we present a procedure to generate magnetic susceptibility versus temperature curves using only a crystal structure as input. The procedure, which is based on the first-principles bottom-up approach [Deumal et al., J. Phys. Chem. A, 2002, 106, 1299], is designed in a way to require as little user interference as possible. We employ quantum chemical calculations to parametrize a Heisenberg Hamiltonian, which is set up and diagonalized for different magnetic model spaces to ensure convergence of the model. We apply the procedure to several 6-oxo-verdazyl radical structures, including newly synthesized compounds, and compare the results to data we obtained from magnetic susceptibility measurements as well as published data to further benchmark our procedure. Furthermore, the different impact of certain dominating coupling constants is systematically analyzed.
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Affiliation(s)
- Thomas Dresselhaus
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster, Germany. and Center for Multiscale Theory and Computation, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster, Germany
| | - Steffen Eusterwiemann
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster, Germany.
| | - David R Matuschek
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster, Germany.
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster, Germany.
| | - Oliver Janka
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 28/30, 48149 Münster, Germany
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 28/30, 48149 Münster, Germany
| | - Armido Studer
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster, Germany.
| | - Johannes Neugebauer
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster, Germany. and Center for Multiscale Theory and Computation, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster, Germany
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16
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Fumanal M, Mota F, Novoa JJ, Ribas-Arino J. Unravelling the Key Driving Forces of the Spin Transition in π-Dimers of Spiro-biphenalenyl-Based Radicals. J Am Chem Soc 2015; 137:12843-55. [DOI: 10.1021/jacs.5b04053] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Maria Fumanal
- Departament de Química
Física and IQTCUB, Facultat de Química, Universitat de Barcelona, Avinguda Diagonal 645, 08028 Barcelona, Spain
| | - Fernando Mota
- Departament de Química
Física and IQTCUB, Facultat de Química, Universitat de Barcelona, Avinguda Diagonal 645, 08028 Barcelona, Spain
| | - Juan J. Novoa
- Departament de Química
Física and IQTCUB, Facultat de Química, Universitat de Barcelona, Avinguda Diagonal 645, 08028 Barcelona, Spain
| | - Jordi Ribas-Arino
- Departament de Química
Física and IQTCUB, Facultat de Química, Universitat de Barcelona, Avinguda Diagonal 645, 08028 Barcelona, Spain
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17
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Vela S, Deumal M, Shiga M, Novoa JJ, Ribas-Arino J. Dynamical effects on the magnetic properties of dithiazolyl bistable materials. Chem Sci 2015; 6:2371-2381. [PMID: 29308151 PMCID: PMC5645919 DOI: 10.1039/c4sc03930k] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 01/22/2015] [Indexed: 12/13/2022] Open
Abstract
The magnetic properties of molecule-based magnets are commonly rationalized by considering only a single nuclear configuration of the system under study (usually an X-ray crystal structure). Here, by means of a computational study, we compare the results obtained using such a static approach with those obtained by explicitly accounting for thermal fluctuations, and uncover the serious limitations of the static perspective when dealing with magnetic crystals whose radicals undergo wide-amplitude motions. As a proof of concept, these limitations are illustrated for the magnetically bistable 1,3,5-trithia-2,4,6-triazapentalenyl (TTTA) material. For its high-temperature phase at 300 K, we show that nuclear dynamics induce large fluctuations in the magnetic exchange interactions (JAB) between spins (up to 1000% of the average value). These deviations result in a ∼20% difference between the 300 K magnetic susceptibility computed by explicitly considering the nuclear dynamics and that computed using the X-ray structure, the former being in better agreement with the experimental data. The unveiled strong coupling between JAB interactions and intermolecular vibrations reveals that considering JAB as a constant value at a given temperature (as always done in molecular magnetism) leads to a flawed description of the magnetism of TTTA. Instead, the physically relevant concept in this case is the statistical distribution of JAB values. The discovery that a single X-ray structure is not adequate enough to interpret the magnetic properties of TTTA is also expected to be decisive in other organic magnets with dominant exchange interactions propagating through labile π-π networks.
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Affiliation(s)
- Sergi Vela
- Departament de Química Física and IQTCUB , Facultat de Química , Universitat de Barcelona , Av. Diagonal 645 , 08028-Barcelona , Spain . ;
| | - Mercè Deumal
- Departament de Química Física and IQTCUB , Facultat de Química , Universitat de Barcelona , Av. Diagonal 645 , 08028-Barcelona , Spain . ;
| | - Motoyuki Shiga
- Center for Computational Science and E-Systems , Japan Atomic Energy Agency , 148-4, Kashiwanoha Campus, 178-4 Wakashiba, Kashiwa , Chiba , 277-0871 , Japan
| | - Juan J Novoa
- Departament de Química Física and IQTCUB , Facultat de Química , Universitat de Barcelona , Av. Diagonal 645 , 08028-Barcelona , Spain . ;
| | - Jordi Ribas-Arino
- Departament de Química Física and IQTCUB , Facultat de Química , Universitat de Barcelona , Av. Diagonal 645 , 08028-Barcelona , Spain . ;
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18
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Fumanal M, Vela S, Ribas-Ariño J, Novoa JJ. On the Importance of Thermal Effects and Crystalline Disorder in the Magnetism of Benzotriazinyl-Derived Organic Radicals. Chem Asian J 2014; 9:3612-22. [DOI: 10.1002/asia.201402871] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Revised: 08/25/2014] [Indexed: 11/10/2022]
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19
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Constantinides CP, Berezin AA, Zissimou GA, Manoli M, Leitus GM, Bendikov M, Probert MR, Rawson JM, Koutentis PA. A Magnetostructural Investigation of an Abrupt Spin Transition for 1-Phenyl-3-trifluoromethyl-1,4-dihydrobenzo[e][1,2,4]triazin-4-yl. J Am Chem Soc 2014; 136:11906-9. [DOI: 10.1021/ja5063746] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | - Andrey A. Berezin
- Department
of Chemistry, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus
| | - Georgia A. Zissimou
- Department
of Chemistry, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus
| | - Maria Manoli
- Department
of Chemistry, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus
| | - Gregory M. Leitus
- Department
of Organic Chemistry, Weizmann Institute of Science, 76100 Rehovot, Israel
| | - Michael Bendikov
- Department
of Organic Chemistry, Weizmann Institute of Science, 76100 Rehovot, Israel
| | - Michael R. Probert
- School
of Chemistry, Newcastle University, Newcastle upon Tyne NE1
7RU, United Kingdom
| | - Jeremy M. Rawson
- Department of Chemistry & Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4, Canada
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20
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Shuku Y, Awaga K. Transition metal complexes and radical anion salts of 1,10-phenanthroline derivatives annulated with a 1,2,5-tiadiazole and 1,2,5-tiadiazole 1,1-dioxide moiety: multidimensional crystal structures and various magnetic properties. Molecules 2014; 19:609-40. [PMID: 24402196 PMCID: PMC6271449 DOI: 10.3390/molecules19010609] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Revised: 12/26/2013] [Accepted: 12/27/2013] [Indexed: 11/17/2022] Open
Abstract
Advances in the molecular variety and the elucidation of the physical properties of 1,10-phenanthroline annulated with 1,2,5-thiadiazole and 1,2,5-thiadiazole 1,1-dioxide moieties have been achieved, and are described herein. A 1,2,5-thiadiazole compound, [1,2,5]thiadiazolo[3,4-f][1,10]phenanthroline (tdap), was used as a ligand to create multidimensional network structures based on S•••S and S•••N intermolecular interactions. A 1,2,5-thiadiazole 1,1-dioxide compound, [1,2,5] thiadiazolo[3,4-f][1,10]phenanthroline, 1,1-dioxide (tdapO2), was designed to create a stable radical anion, as well as good network structures. Single crystal X-ray structure analyses revealed that transition metal complexes of tdap, and radical anion salts of tdapO2 formed multidimensional network structures, as expected. Two kinds of tdap iron complexes, namely [Fe(tdap)2(NCS)2] and [Fe(tdap)2(NCS)2]•MeCN exhibited spin crossover transitions, and their transition temperatures showed a difference of 150 K, despite their similar molecular structures. Magnetic measurements for the tdapO2 radical anion salts revealed that the magnetic coupling constants between neighboring radical species vary from strongly antiferromagnetic (J = −320 K) to ferromagnetic (J = 24 K), reflecting the differences in their π overlap motifs.
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Affiliation(s)
- Yoshiaki Shuku
- Department of Chemistry & Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8602, Japan.
| | - Kunio Awaga
- Department of Chemistry & Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8602, Japan.
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21
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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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22
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Merhi A, Roisnel T, Rigaut S, Train C, Norel L. Ferromagnetic intermolecular exchange interaction in ethynyl-verdazyl radical crystals. CrystEngComm 2014. [DOI: 10.1039/c4ce01437e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The newly synthesized p-ethynylphenyl-oxoverdazyl radical shows unusual slipped 1D chains held together by π–π interactions leading to ferromagnetic exchange interactions.
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Affiliation(s)
- Areej Merhi
- UMR 6226 CNRS - Université de Rennes 1
- Institut des Sciences Chimiques de Rennes
- Campus de Beaulieu
- F-35042 Rennes Cedex, France
| | - Thierry Roisnel
- UMR 6226 CNRS - Université de Rennes 1
- Institut des Sciences Chimiques de Rennes
- Campus de Beaulieu
- F-35042 Rennes Cedex, France
| | - Stéphane Rigaut
- UMR 6226 CNRS - Université de Rennes 1
- Institut des Sciences Chimiques de Rennes
- Campus de Beaulieu
- F-35042 Rennes Cedex, France
| | | | - Lucie Norel
- UMR 6226 CNRS - Université de Rennes 1
- Institut des Sciences Chimiques de Rennes
- Campus de Beaulieu
- F-35042 Rennes Cedex, France
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23
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Gopal Chilkuri V, Trinquier G, Ben Amor N, Malrieu JP, Guihéry N. In Search of Organic Compounds Presenting a Double Exchange Phenomenon. J Chem Theory Comput 2013; 9:4805-15. [PMID: 26583399 DOI: 10.1021/ct4005855] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The objective of this paper is to design a consistent series of organic molecules that may present a double exchange mechanism and study their low energy spectrum using spin unrestricted Density Functional Theory. For this purpose, organic tetra-methylene methane units having an S = 1 spin ground state and diamagnetic organic bridges are taken as building blocks for constructing molecules having two or more magnetic units. When biunit systems are ionized, the ground state of the resulting molecular ions may be either a quartet, if the spectrum is ruled by a double exchange mechanism, or a doublet, if it obeys the logic of a monoelectronic picture. A strategy based on the physical analysis of the leading interactions is followed in order to energetically favor a high-spin ground state. It is shown that the most promising compounds involve bridges that have both a large gap between the highest occupied and the lowest unoccupied molecular orbitals and small coefficients on the atoms to which the magnetic units are connected. While the followed strategy enables one to conceive organic compounds exhibiting a double exchange phenomenon, it is shown that the electronic mechanism ruling the spectrum of such organic double exchange compounds is different from that of their inorganic homologues. A new method to reconstruct the spectrum of low energy from various spin unrestricted DFT solutions is proposed and applied. Finally monodimensional and bidimensional periodic lattices based on the most promising organic architecture are suggested.
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Affiliation(s)
- Vijay Gopal Chilkuri
- Laboratoire de Chimie et de Physique Quantiques, IRSAMC/UMR5626, Université de Toulouse 3 , 118 route de Narbonne, F-31062 Toulouse Cédex 4, France
| | - Georges Trinquier
- Laboratoire de Chimie et de Physique Quantiques, IRSAMC/UMR5626, Université de Toulouse 3 , 118 route de Narbonne, F-31062 Toulouse Cédex 4, France
| | - Nadia Ben Amor
- Laboratoire de Chimie et de Physique Quantiques, IRSAMC/UMR5626, Université de Toulouse 3 , 118 route de Narbonne, F-31062 Toulouse Cédex 4, France
| | - Jean-Paul Malrieu
- Laboratoire de Chimie et de Physique Quantiques, IRSAMC/UMR5626, Université de Toulouse 3 , 118 route de Narbonne, F-31062 Toulouse Cédex 4, France
| | - Nathalie Guihéry
- Laboratoire de Chimie et de Physique Quantiques, IRSAMC/UMR5626, Université de Toulouse 3 , 118 route de Narbonne, F-31062 Toulouse Cédex 4, France
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24
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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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25
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Lipunova GN, Fedorchenko TG, Chupakhin ON. Verdazyls: synthesis, properties, application. RUSSIAN CHEMICAL REVIEWS 2013. [DOI: 10.1070/rc2013v082n08abeh004341] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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26
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Shuku Y, Suizu R, Domingo A, Calzado CJ, Robert V, Awaga K. Multidimensional Network Structures and Versatile Magnetic Properties of Intermolecular Compounds of a Radical–Anion Ligand, [1,2,5]Thiadiazolo[3,4-f][1,10]phenanthroline 1,1-Dioxide. Inorg Chem 2013; 52:9921-30. [PMID: 23937243 DOI: 10.1021/ic401078z] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yoshiaki Shuku
- Department of Chemistry & Research Centre for Materials Science, Nagoya University, Furo-cho, Chikusa, 464-8602 Nagoya, Japan
| | - Rie Suizu
- Department of Chemistry & Research Centre for Materials Science, Nagoya University, Furo-cho, Chikusa, 464-8602 Nagoya, Japan
| | - Alex Domingo
- Laboratoire de Chimie Quantique, Institut de Chimie
UMR 7177, Université de Strasbourg, 1 rue Blaise Pascal, 67000 Strasbourg, France
| | - Carmen J. Calzado
- Departamento de Química Física, Universidad de Sevilla, c/Prof. García González,
s/n. E-41012 Sevilla, Spain
| | - Vincent Robert
- Laboratoire de Chimie Quantique, Institut de Chimie
UMR 7177, Université de Strasbourg, 1 rue Blaise Pascal, 67000 Strasbourg, France
| | - Kunio Awaga
- Department of Chemistry & Research Centre for Materials Science, Nagoya University, Furo-cho, Chikusa, 464-8602 Nagoya, Japan
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27
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Bandeira NAG, Maynau D, Robert V, Le Guennic B. Do π–π Stacking Interactions Really Play a Role in the Magnetic Coupling Mechanisms of [Cu2(μ2-CH3COO)2L2(H2O)2]n+ (L = heterocyclic base, n = 0, 2) Complexes? An ab initio Inspection. Inorg Chem 2013; 52:7980-6. [DOI: 10.1021/ic400517z] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nuno A. G. Bandeira
- C8−Fac. Ciências, University de Lisboa, Campo Grande, 1749-016 Lisbon,
Portugal
- Laboratoire de Chimie, UMR CNRS 5182, Ecole Normale Supérieure de Lyon, 46 allée
d’Italie, 69364 Lyon cedex 07, France
| | - Daniel Maynau
- Université de Toulouse, UPS, LCPQ (Laboratoire de Chimie et Physique
Quantiques), IRSAMC, 118 route de Narbonne, 31062 Toulouse cedex,
France
| | - Vincent Robert
- Laboratoire de Chimie
Quantique, Institut de Chimie UMR 7177, CNRS and Université de Strasbourg, 4 rue Blaise Pascal, Strasbourg 67070,
France
- Laboratoire de Chimie, UMR CNRS 5182, Ecole Normale Supérieure de Lyon, 46 allée
d’Italie, 69364 Lyon cedex 07, France
| | - Boris Le Guennic
- Institut des Sciences
Chimiques de Rennes, Université de Rennes 1, CNRS 6226, 35042, Rennes Cedex, France
- Laboratoire de Chimie, UMR CNRS 5182, Ecole Normale Supérieure de Lyon, 46 allée
d’Italie, 69364 Lyon cedex 07, France
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28
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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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31
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Molčanov K, Kojić-Prodić B, Babić D, Pajić D, Novosel N, Zadro K. Temperature induced reversible structural and magnetic changes in a crystal of tetrachlorosemiquinone anion radical. CrystEngComm 2012. [DOI: 10.1039/c2ce25893e] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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33
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Nemec I, Herchel R, Šalitroš I, Trávníček Z, Moncoľ J, Fuess H, Ruben M, Linert W. Anion driven modulation of magnetic intermolecular interactions and spin crossover properties in an isomorphous series of mononuclear iron(iii) complexes with a hexadentate Schiff base ligand. CrystEngComm 2012. [DOI: 10.1039/c2ce25862e] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Vérot M, Bréfuel N, Pécaut J, Train C, Robert V. Seeking Hidden Magnetic Phenomena by Theoretical Means in a Thiooxoverdazyl Adduct. Chem Asian J 2011; 7:380-6. [DOI: 10.1002/asia.201100736] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Indexed: 11/06/2022]
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35
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Trinquier G, Suaud N, Guihéry N, Malrieu JP. Designing Magnetic Organic Lattices from High-Spin Polycyclic Units. Chemphyschem 2011; 12:3020-36. [DOI: 10.1002/cphc.201100311] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2011] [Indexed: 11/11/2022]
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36
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Norel L, Rota JB, Chamoreau LM, Pilet G, Robert V, Train C. Spin Transition and Exchange Interaction: Janus Visions of Supramolecular Spin Coupling between Face-to-Face Verdazyl Radicals. Angew Chem Int Ed Engl 2011; 50:7128-31. [PMID: 21688361 DOI: 10.1002/anie.201101190] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2011] [Revised: 03/23/2011] [Indexed: 11/07/2022]
Affiliation(s)
- Lucie Norel
- Institut Parisien de Chimie Moléculaire, Paris, France
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37
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Norel L, Rota JB, Chamoreau LM, Pilet G, Robert V, Train C. Spin Transition and Exchange Interaction: Janus Visions of Supramolecular Spin Coupling between Face-to-Face Verdazyl Radicals. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201101190] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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38
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Vérot M, Rota JB, Kepenekian M, Guennic BL, Robert V. Magnetic and conduction properties in 1D organic radical materials: an ab initio inspection for a challenging quest. Phys Chem Chem Phys 2011; 13:6657-61. [DOI: 10.1039/c0cp02124e] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Novoa JJ, Deumal M, Jornet-Somoza J. Calculation of microscopic exchange interactions and modelling of macroscopic magnetic properties in molecule-based magnets. Chem Soc Rev 2011; 40:3182-212. [PMID: 21321725 DOI: 10.1039/c0cs00112k] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- J J Novoa
- Departament de Química Física and IQTCUB, Universitat de Barcelona, Barcelona, Spain.
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40
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Oms O, Rota JB, Norel L, Calzado CJ, Rousselière H, Train C, Robert V. Beyond Kahn's Model: Substituent and Heteroatom Influence on Exchange Interaction in a Metal-Verdazyl Complex. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201001033] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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41
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Lekin K, Winter SM, Downie LE, Bao X, Tse JS, Desgreniers S, Secco RA, Dube PA, Oakley RT. Hysteretic spin crossover between a bisdithiazolyl radical and its hypervalent σ-dimer. J Am Chem Soc 2010; 132:16212-24. [PMID: 20964332 DOI: 10.1021/ja106768z] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The bisdithiazolyl radical 1a is dimorphic, existing in two distinct molecular and crystal modifications. The α-phase crystallizes in the tetragonal space group P4̅2(1)m and consists of π-stacked radicals, tightly clustered about 4̅ points and running parallel to c. The β-phase belongs to the monoclinic space group P2(1)/c and, at ambient temperature and pressure, is composed of π-stacked dimers in which the radicals are linked laterally by hypervalent four-center six-electron S···S-S···S σ-bonds. Variable-temperature magnetic susceptibility χ measurements confirm that α-1a behaves as a Curie-Weiss paramagnet; the low-temperature variations in χ can be modeled in terms of a 1D Heisenberg chain of weakly coupled AFM S = (1)/(2) centers. The dimeric phase β-1a is essentially diamagnetic up to 380 K. Above this temperature there is a sharp hysteretic (T↑= 380 K, T↓ = 375 K) increase in χ and χT. Powder X-ray diffraction analysis of β-1a at 393 K has established that the phase transition corresponds to a dimer-to-radical conversion in which the hypervalent S···S-S···S σ-bond is cleaved. Variable-temperature and -pressure conductivity measurements indicate that α-1a behaves as a Mott insulator, but the ambient-temperature conductivity σ(RT) increases from near 10(-7) S cm(-1) at 0.5 GPa to near 10(-4) S cm(-1) at 5 GPa. The value of σ(RT) for β-1a (near 10(-4) S cm(-1) at 0.5 GPa) initially decreases with pressure as the phase change takes place, but beyond 1.5 GPa this trend reverses, and σ(RT) increases in a manner which parallels the behavior of α-1a. These changes in conductivity of β-1a are interpreted in terms of a pressure-induced dimer-to-radical phase change. High-pressure, ambient-temperature powder diffraction analysis of β-1a confirms such a transition between 0.65 and 0.98 GPa and establishes that the structural change involves rupture of the dimer in a manner akin to that observed at high temperature and ambient pressure. The response of the S···S-S···S σ-bond in β-1a to heat and pressure is compared to that of related dimers possessing S···Se-Se···S σ-bonds.
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Affiliation(s)
- Kristina Lekin
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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Bonnet ML, Robert V, Tsuchiizu M, Omori Y, Suzumura Y. Intramolecular charge ordering in the multi molecular orbital system (TTM-TTP)I3. J Chem Phys 2010; 132:214705. [DOI: 10.1063/1.3432764] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Rota JB, Calzado CJ, Train C, Robert V. Microscopic origins of the ferromagnetic exchange coupling in oxoverdazyl-based Cu(II) complex. J Chem Phys 2010; 132:154702. [DOI: 10.1063/1.3378023] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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