1
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Torres Ramírez RG, Trzop E, Collet E. Magnetoelectric and MIESST effects in spin crossover materials exhibiting symmetry-breaking. Dalton Trans 2024; 53:10159-10167. [PMID: 38819197 DOI: 10.1039/d4dt00672k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2024]
Abstract
Giant magnetoelectric coupling and magnetic-field-induced spin state trapping (MIESST) were recently reported in spin crossover materials with polar phases. We discuss these phenomena considering the distinct contributions of the change of the molecular spin state, driven by the magnetic field, and the coupled structural symmetry-breaking during the stepwise change of electric polarisation or MIESST.
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Affiliation(s)
- Ricardo G Torres Ramírez
- Univ Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, 35000 Rennes, France.
- CNRS, Univ Rennes, DYNACOM (Dynamical Control of Materials Laboratory) - IRL 2015, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan
| | - Elzbieta Trzop
- Univ Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, 35000 Rennes, France.
- CNRS, Univ Rennes, DYNACOM (Dynamical Control of Materials Laboratory) - IRL 2015, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan
| | - Eric Collet
- Univ Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, 35000 Rennes, France.
- CNRS, Univ Rennes, DYNACOM (Dynamical Control of Materials Laboratory) - IRL 2015, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan
- Institut universitaire de France (IUF), France
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2
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Książek M, Weselski M, Kaźmierczak M, Półrolniczak A, Katrusiak A, Paliwoda D, Kusz J, Bronisz R. Extremely Slow Thermally-Induced Spin Crossover in the Two-Dimensional Network [Fe(bbtr) 3 ](BF 4 ) 2. Chemistry 2024; 30:e202302887. [PMID: 37906679 DOI: 10.1002/chem.202302887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 10/28/2023] [Accepted: 10/31/2023] [Indexed: 11/02/2023]
Abstract
Cooling [Fe(bbtr)3 ](BF4 )2 (bbtr=1,4-di(1,2,3-triazol-1-yl)butane) triggers very slow spin crossover below 80 K (T1/2 ↓ =76 K). The spin crossover (SCO) is accompanied by a hysteresis loop (T1/2 ↑ =89 K). In contrast to isostructural perchlorate analogue [Fe(bbtr)3 ](ClO4 )2 in which spin crossover during cooling is preceded by phase transition at TPT =126 K in tetrafluoroborate phase transition does not occur to the beginning of spin crossover (80 K). Studies of mixed crystals [Fe(bbtr)3 ](BF4 )2(1-x) (ClO4 )2x (0.5≤x≤0.9) showed that a phase transition precedes spin crossover, however, for x≅0.46 intersection of T1/2 (x) and TPT (x) dependencies takes place. The application of pressure of 1 GPa shifts the spin crossover in [Fe(bbtr)3 ](BF4 )2 to a temperature above 270 K. High-pressure studies of neat tetrafluoroborate and perchlorate, as well as mixed crystals [Fe(bbtr)3 ](BF4 )2(1-x) (ClO4 )2x (0.1≤x≤0.9), revealed that at 295 K P1/2 value changes linearly with x indicating similar mechanism of spin crossover under elevated pressure in all systems under investigation. Variable pressure single crystal X-ray diffraction studies confirmed that in contrast to thermally induced spin crossover undergoing differently in tetrafluoroborate and perchlorate an application of high pressure removes this differentiation leading to a similar mechanism depending at first on start spin crossover and then P-3→P-1 phase transition occurs. In this report we have shown that 2D coordination polymer [Fe(bbtr)3 ](BF4 )2 (bbtr=1,4-di(1,2,3-triazol-1-yl)butane) treated to date as spin crossover silent shows thermally induced spin crossover phenomenon. Spin crossover in tetrafluoroborate is extremely slow. Determination of the spin crossover curve required carrying measurement in the settle mode-cooling from 85 to 70 K took about 600 h (average velocity of change of temperature ca. 0.0004 K/min).
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Affiliation(s)
- Maria Książek
- Institute of Physics, University of Silesia, 75 Pułku Piechoty 1, 41-500, Chorzów, Poland
| | - Marek Weselski
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383, Wrocław, Poland
| | - Marcin Kaźmierczak
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383, Wrocław, Poland
| | - Aleksandra Półrolniczak
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614, Poznań, Poland
| | - Andrzej Katrusiak
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614, Poznań, Poland
| | - Damian Paliwoda
- European Spallation Source ERIC, Partikelgatan 2, 224 84, Lund, Sweden
| | - Joachim Kusz
- Institute of Physics, University of Silesia, 75 Pułku Piechoty 1, 41-500, Chorzów, Poland
| | - Robert Bronisz
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383, Wrocław, Poland
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3
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Paliwoda D, Vendier L, Nicolazzi W, Molnár G, Bousseksou A. Pressure Tuning of Coupled Structural and Spin State Transitions in the Molecular Complex [Fe(H 2B(pz) 2) 2(phen)]. Inorg Chem 2022; 61:15991-16002. [PMID: 36162137 DOI: 10.1021/acs.inorgchem.2c02286] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The large volume change, which accompanies the molecular spin crossover (SCO) phenomenon in some transition metal complexes, prompts frequently the coupling of the SCO with other instabilities. Understanding the driving mechanism(s) of such coupled phase transitions is not only important for fundamental reasons but also provides scope for the development of multifunctional materials. The general theoretical expectation is that the coupling has elastic origin, and the sequence of transitions can be tuned by an externally applied pressure, but dedicated experiments remain scarce. Here, we used high-pressure and low-temperature single-crystal X-ray diffraction to investigate the high-spin (HS) to low-spin (LS) transitions in the molecular complexes [FeII(H2B(pz)2)2(bipy)] and [FeII(H2B(pz)2)2(phen)]. In the bipyridine complex, the SCO is continuous and isostructural over the whole T, P-range (100-300 K, 0-2 GPa). In the phenanthroline derivative, however, the SCO is concomitant with a symmetry-breaking transition (C2/c to P1̅). Structural analysis reveals that the coupling between the two phenomena can be tuned by external pressure from a virtually simultaneous HSC2/c-LSP1̅ transition to the sequence of HSC2/c-LSC2/c-LSP1̅ transitions. The correlation of spontaneous strain and order parameter behaviors highlights that the "separated" transitions remain still connected via strain coupling, whereas the "simultaneous" transitions are partially split.
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Affiliation(s)
- Damian Paliwoda
- LCC, CNRS & Université de Toulouse (UPS, INP), 31077 Toulouse, France
| | - Laure Vendier
- LCC, CNRS & Université de Toulouse (UPS, INP), 31077 Toulouse, France
| | - William Nicolazzi
- LCC, CNRS & Université de Toulouse (UPS, INP), 31077 Toulouse, France
| | - Gábor Molnár
- LCC, CNRS & Université de Toulouse (UPS, INP), 31077 Toulouse, France
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4
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Chakraborty P, Sy M, Fourati H, Delgado T, Dutta M, Das C, Besnard C, Hauser A, Enachescu C, Boukheddaden K. Optical microscopy imaging of the thermally-induced spin transition and isothermal multi-stepped relaxation in a low-spin stabilized spin-crossover material. Phys Chem Chem Phys 2022; 24:982-994. [PMID: 34918013 DOI: 10.1039/d1cp04321h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The thermal spin transition and the photo-induced high-spin → low-spin relaxation of the prototypical [Fe(ptz)6](BF4)2 spin-crossover compound (ptz = 1-propyltetrazole) diluted in the isostructural ruthenium host lattice [Ru(ptz)6](BF4)2, which stabilizes the Fe(II) low-spin state, have been investigated. We demonstrate the presence of a crystallographic phase transition around 145 K (i.e. from the high-temperature ordered high-spin phase to a low-temperature disordered low-spin phase) upon slow cooling from room temperature. This crystallographic phase transition is decoupled from the thermal spin transition. A supercooled ordered low-spin phase is observed as in the pure Fe(II) analogue upon fast cooling. A similar order-disorder phase transition is also observed for pure [Ru(ptz)6](BF4)2 but at relatively higher temperature (i.e. at around 150 K) without involving any spin transition. For Ru-diluted [Fe(ptz)6]2+, the crystallographic phase transition as well as strong cooperative effects involving various degrees of elastic frustration are at the origin of stepped sigmoidal high-spin → low-spin relaxation curves, which are modelled in the framework of a classical mean field model, considering both the tunnelling and thermally activated regimes. Optical microscopy studies performed on two different single crystals showed the existence of hysteretic thermal transitions with slight domain formation, hardly visible in the static crystal images. This behavior is attributed to the double effect upon Ru dilution, which decreases the cooperative character of the transition and simultaneously reduces the optical contrast between the LS and HS states. Moreover, the transition temperature revealed to be slightly crystal dependent, highlighting the crucial role of the spatial distribution of Ru from one crystal to another, in addition to the well-known effects of crystal shape and size.
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Affiliation(s)
- Pradip Chakraborty
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721302, India.
| | - Mouhamadou Sy
- Université Assane Seck de Ziguinchor, Département de Physique, LCPM, BP 523 Diabir, Ziguinchor 27000, Sénégal
| | - Houcem Fourati
- Université Paris-Saclay, UVSQ, CNRS, GEMAC, 45 Avenue des Etats Unis 78035, Versailles, France.
| | - Teresa Delgado
- Département de Chimie Physique, Université de Genève, 30, Quai Ernest-Ansermet, CH-1211, Genève 4, Switzerland.,Chimie ParisTech-CNRS, IRCP (PSL), 11 rue P. et M. Curie, 75005 Paris, France
| | - Mousumi Dutta
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721302, India.
| | - Chinmoy Das
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721302, India.
| | - Céline Besnard
- Laboratoire de Cristallographie, Université de Genève, 24, Quai Ernest-Ansermet, CH-1211, Genève 4, Switzerland
| | - Andreas Hauser
- Département de Chimie Physique, Université de Genève, 30, Quai Ernest-Ansermet, CH-1211, Genève 4, Switzerland
| | | | - Kamel Boukheddaden
- Université Paris-Saclay, UVSQ, CNRS, GEMAC, 45 Avenue des Etats Unis 78035, Versailles, France.
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5
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Kelai M, Cahier B, Atanasov M, Neese F, Tong Y, Zhang L, Bellec A, Iasco O, Rivière E, Guillot R, Chacon C, Girard Y, Lagoute J, Rousset S, Repain V, Otero E, Arrio MA, Sainctavit P, Barra AL, Boillot ML, Mallah T. Robust magnetic anisotropy of a monolayer of hexacoordinate Fe( ii) complexes assembled on Cu(111). Inorg Chem Front 2021. [DOI: 10.1039/d1qi00085c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The tris pyrazolyl borate ligand imposes a rigid scaffold around Fe(ii) ensuring a robust magnetic anisotropy when the molecules assembled as monolayers suffer from the dissymmetric environment of the substrate/vacuum interface.
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6
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7
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Delgado T, Tissot A, Guénée L, Hauser A, Valverde-Muñoz FJ, Seredyuk M, Real JA, Pillet S, Bendeif EE, Besnard C. Very Long-Lived Photogenerated High-Spin Phase of a Multistable Spin-Crossover Molecular Material. J Am Chem Soc 2018; 140:12870-12876. [DOI: 10.1021/jacs.8b06042] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Teresa Delgado
- Département de Chimie Physique, Université de Genève, 1211 Genève, Switzerland
| | - Antoine Tissot
- Institut des Matériaux Poreux de Paris, FRE 2000 CNRS, Ecole Normale Supérieure, Ecole Supérieure de Physique et de Chimie Industrielle de Paris, PSL Research University, 75005 Paris, France
| | - Laure Guénée
- Laboratoire de Cristallographie, Université de Genève, 1211 Genève, Switzerland
| | - Andreas Hauser
- Département de Chimie Physique, Université de Genève, 1211 Genève, Switzerland
| | | | - Maksym Seredyuk
- Departament de Química Inorgánica, Institut de Ciència Molecular (ICMol), Universitat de València, 46010 Valencia, Spain
| | - José Antonio Real
- Departament de Química Inorgánica, Institut de Ciència Molecular (ICMol), Universitat de València, 46010 Valencia, Spain
| | | | | | - Céline Besnard
- Laboratoire de Cristallographie, Université de Genève, 1211 Genève, Switzerland
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8
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Capel Berdiell I, Kulmaczewski R, Cespedes O, Halcrow MA. An Incomplete Spin Transition Associated with a Z'=1→Z'=24 Crystallographic Symmetry Breaking. Chemistry 2018; 24:5055-5059. [PMID: 29111607 PMCID: PMC5972820 DOI: 10.1002/chem.201704896] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Indexed: 12/31/2022]
Abstract
Crystalline [FeL2 ][BF4 ]2 ⋅Me2 CO (L=N-[2,6-di{pyrazol-1-yl}pyrid-4-yl]acetamide) is high-spin at room temperature, and undergoes an abrupt, hysteretic spin-crossover at T1/2 =137 K (ΔT1/2 =14 K) that proceeds to about 50 % completeness. This is associated with a crystallographic phase transition, from phase 1 (P21 /c, Z=4) to phase 2 (P21 , Z=48). The cations associate into chains in the crystal through weak intermolecular π⋅⋅⋅π interactions. Phase 2 contains a mixture of high-spin and low-spin molecules, which are grouped into triads along these chains. The perchlorate salt [FeL2 ][ClO4 ]2 ⋅Me2 CO also adopts phase 1 at room temperature but undergoes a different phase transition near 135 K to phase 3 (P21 /c, Z=8) without a change in spin state.
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Affiliation(s)
- Izar Capel Berdiell
- School of ChemistryUniversity of LeedsWoodhouse LaneLeedsLS2 9JTUnited Kingdom
| | - Rafal Kulmaczewski
- School of ChemistryUniversity of LeedsWoodhouse LaneLeedsLS2 9JTUnited Kingdom
| | - Oscar Cespedes
- School of Physics and AstronomyUniversity of LeedsE.C. Stoner BuildingLeedsLS2 9JTUnited Kingdom
| | - Malcolm A. Halcrow
- School of ChemistryUniversity of LeedsWoodhouse LaneLeedsLS2 9JTUnited Kingdom
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9
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Weselski M, Książek M, Rokosz D, Dreczko A, Kusz J, Bronisz R. Double spin transition in a two dimensional Fe(ii) coordination network. Chem Commun (Camb) 2018; 54:3895-3898. [PMID: 29610797 DOI: 10.1039/c8cc01621f] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the two dimensional coordination network [Fe(ebbtr)2(CH3CN)2](ClO4)2·4CH3CN a sequence of LS → HS → LS → HS transitions occurs.
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Affiliation(s)
- Marek Weselski
- Faculty of Chemistry
- University of Wrocław
- Wrocław 50-383
- Poland
| | - Maria Książek
- Institute of Physics
- University of Silesia
- Katowice 40-007
- Poland
| | - Dominika Rokosz
- Faculty of Chemistry
- University of Wrocław
- Wrocław 50-383
- Poland
| | | | - Joachim Kusz
- Institute of Physics
- University of Silesia
- Katowice 40-007
- Poland
| | - Robert Bronisz
- Faculty of Chemistry
- University of Wrocław
- Wrocław 50-383
- Poland
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10
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Urtizberea A, Roubeau O. Switchable slow relaxation of magnetization in the native low temperature phase of a cooperative spin-crossover compound. Chem Sci 2017; 8:2290-2295. [PMID: 28451331 PMCID: PMC5363372 DOI: 10.1039/c6sc04737h] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 12/09/2016] [Indexed: 12/20/2022] Open
Abstract
The implementation of single-molecule magnet properties in spin crossover materials is sought as a unique source of magnetic multistability at the molecular level. Examples however remain extremely scarce, in part due to the diamagnetic state of most Fe(ii) spin crossover materials at low temperatures. We have studied the complex [Fe(mtz)6](CF3SO3)2 (mtz = 1-methyltetrazole) as a tantalizing candidate of such coexistence, due to its known partial spin crossover and therefore paramagnetic native low temperature phase. The single-crystal structures of [Fe(mtz)6](CF3SO3)2 reported here allow rationalizing its peculiar cooperative spin-crossover behavior. Importantly, the high-spin Fe crystallographic sites at low temperature exhibit a high symmetry with a local trigonal distortion, usually source of magnetic anisotropy. The analysis of equilibrium magnetic properties confirm the presence of a significant magnetic anisotropy at the Fe(ii) high spin sites in the high symmetry low temperature phase. This results in field-induced slow relaxation of their magnetization which is dominated at low temperature by tunneling and direct processes and is strongly enhanced above 3 K by Raman and Orbach processes. Unprecedentedly, these single-molecule magnet properties are observed in the native ground state of a spin crossover material and efficiently and reversibly switched OFF through visible light irradiation.
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Affiliation(s)
- A Urtizberea
- Instituto de Ciencia de Materiales de Aragón (ICMA) , CSIC and Universidad de Zaragoza , Plaza San Francisco s/n , 50009 Zaragoza , Spain .
| | - O Roubeau
- Instituto de Ciencia de Materiales de Aragón (ICMA) , CSIC and Universidad de Zaragoza , Plaza San Francisco s/n , 50009 Zaragoza , Spain .
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11
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Alvarez S. Distortion Pathways of Transition Metal Coordination Polyhedra Induced by Chelating Topology. Chem Rev 2015; 115:13447-83. [PMID: 26575868 DOI: 10.1021/acs.chemrev.5b00537] [Citation(s) in RCA: 127] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A continuous shape measures analysis of the coordination polyhedra of a host of transition metal complexes with bi- and multidentate ligands discloses the distortion pathway associated with each particular topology of the chelate rings formed. The basic parameter that controls the degree of distortion is the metal-donor atom bond distance that induces nonideal bond angles due to the rigidity of the ligands. Thus, the degree of distortion within each family of complexes depends on the atomic size, on which the high- or low-spin state has a large effect. Special attention is therefore paid to several spin-crossover systems and to the enhanced distortions that go along with the transition from low- to high-spin state affected by temperature, light, or pressure. Several families of complexes show deviations from the expected distortion pathways in the high-spin state that can be associated to the onset of intermolecular interactions such as secondary coordination of counterions or solvent molecules. Also, significant displacement of counterions in an extended solid may result from the changes in metal-ligand bond distances when ligands are involved in intermolecular hydrogen bonding.
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Affiliation(s)
- Santiago Alvarez
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona , Martí i Franquès 1-11, 08028 Barcelona, Spain
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12
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Park JG, Jeon IR, Harris TD. Electronic Effects of Ligand Substitution on Spin Crossover in a Series of Diiminoquinonoid-Bridged FeII2 Complexes. Inorg Chem 2014; 54:359-69. [DOI: 10.1021/ic5025586] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jesse G. Park
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Ie-Rang Jeon
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - T. David Harris
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
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13
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Guionneau P. Crystallography and spin-crossover. A view of breathing materials. Dalton Trans 2014; 43:382-93. [DOI: 10.1039/c3dt52520a] [Citation(s) in RCA: 168] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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14
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Feng X, Mathonière C, Jeon IR, Rouzières M, Ozarowski A, Aubrey ML, Gonzalez MI, Clérac R, Long JR. Tristability in a Light-Actuated Single-Molecule Magnet. J Am Chem Soc 2013; 135:15880-4. [DOI: 10.1021/ja407332y] [Citation(s) in RCA: 159] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Xiaowen Feng
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Corine Mathonière
- CNRS, ICMCB, UPR 9048, Pessac F-33600, France
- Université
Bordeaux, ICMCB, UPR 9048, Pessac F-33600, France
| | - Ie-Rang Jeon
- CNRS, ICMCB, UPR 9048, Pessac F-33600, France
- Université
Bordeaux, ICMCB, UPR 9048, Pessac F-33600, France
- CNRS, CRPP, UPR
8641, Research team for “Molecular Magnetic Materials”, Pessac F-33600, France
- Université
Bordeaux, CRPP, UPR 8641, Pessac F-33600, France
| | - Mathieu Rouzières
- CNRS, CRPP, UPR
8641, Research team for “Molecular Magnetic Materials”, Pessac F-33600, France
- Université
Bordeaux, CRPP, UPR 8641, Pessac F-33600, France
| | - Andrew Ozarowski
- National High Magnetic
Field Laboratory, Tallahassee, Florida 32310, United States
| | - Michael L. Aubrey
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Miguel I. Gonzalez
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Rodolphe Clérac
- CNRS, CRPP, UPR
8641, Research team for “Molecular Magnetic Materials”, Pessac F-33600, France
- Université
Bordeaux, CRPP, UPR 8641, Pessac F-33600, France
| | - Jeffrey R. Long
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
- Materials
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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15
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Craig GA, Costa JS, Teat SJ, Roubeau O, Yufit DS, Howard JAK, Aromí G. Multimetastability in a Spin-Crossover Compound Leading to Different High-Spin-to-Low-Spin Relaxation Dynamics. Inorg Chem 2013; 52:7203-9. [DOI: 10.1021/ic400776x] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gavin A. Craig
- Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 647,
08028 Barcelona, Spain
| | - Jose Sánchez Costa
- Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 647,
08028 Barcelona, Spain
| | - Simon J. Teat
- Advanced Light Source, Berkeley Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Olivier Roubeau
- Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC and Universidad de Zaragoza, Plaza San Francisco s/n, 50009 Zaragoza, Spain
| | - Dmitry S. Yufit
- Department of Chemistry, Durham University, South Road, Durham
DH1 3LE, U.K
| | | | - Guillem Aromí
- Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 647,
08028 Barcelona, Spain
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16
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Pápai M, Vankó G, de Graaf C, Rozgonyi T. Theoretical Investigation of the Electronic Structure of Fe(II) Complexes at Spin-State Transitions. J Chem Theory Comput 2012; 9:509-519. [PMID: 25821416 PMCID: PMC4358629 DOI: 10.1021/ct300932n] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Indexed: 01/30/2023]
Abstract
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The electronic structure relevant to low spin (LS)↔high
spin (HS) transitions in Fe(II) coordination compounds with a FeN6 core are studied. The selected [Fe(tz)6]2+ (1) (tz = 1H-tetrazole), [Fe(bipy)3]2+ (2) (bipy = 2,2′-bipyridine), and [Fe(terpy)2]2+ (3) (terpy = 2,2′:6′,2″-terpyridine)
complexes have been actively studied experimentally, and with their
respective mono-, bi-, and tridentate ligands, they constitute a comprehensive
set for theoretical case studies. The methods in this work include
density functional theory (DFT), time-dependent DFT (TD-DFT), and
multiconfigurational second order perturbation theory (CASPT2). We
determine the structural parameters as well as the energy splitting
of the LS–HS states (ΔEHL) applying the above methods and comparing their performance. We
also determine the potential energy curves representing the ground
and low-energy excited singlet, triplet, and quintet d6 states along the mode(s) that connect the LS and HS states. The
results indicate that while DFT is well suited for the prediction
of structural parameters, an accurate multiconfigurational approach
is essential for the quantitative determination of ΔEHL. In addition, a good qualitative agreement
is found between the TD-DFT and CASPT2 potential energy curves. Although
the TD-DFT results might differ in some respect (in our case, we found
a discrepancy at the triplet states), our results suggest that this
approach, with due care, is very promising as an alternative for the
very expensive CASPT2 method. Finally, the two-dimensional (2D) potential
energy surfaces above the plane spanned by the two relevant configuration
coordinates in [Fe(terpy)2]2+ were computed
at both the DFT and CASPT2 levels. These 2D surfaces indicate that
the singlet–triplet and triplet–quintet states are separated
along different coordinates, i.e., different vibration modes. Our
results confirm that in contrast to the case of complexes with mono-
and bidentate ligands, the singlet–quintet transitions in [Fe(terpy)2]2+ cannot be described using a single configuration
coordinate.
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Affiliation(s)
- Mátyás Pápai
- Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 49, Hungary
| | - György Vankó
- Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 49, Hungary
| | - 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
| | - Tamás Rozgonyi
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, H-1025 Budapest, Pusztaszeri út 59-67, Hungary
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17
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Chakraborty P, Enachescu C, Walder C, Bronisz R, Hauser A. Thermal and Light-Induced Spin Switching Dynamics in the 2D Coordination Network of {[Zn1-xFex(bbtr)3](ClO4)2}∞: The Role of Cooperative Effects. Inorg Chem 2012; 51:9714-22. [DOI: 10.1021/ic301006c] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pradip Chakraborty
- Département de Chimie Physique, Université de Genève, 30, quai Ernest-Ansermet,
CH-1211 Genève, Switzerland
| | | | - Christophe Walder
- Département de Chimie Physique, Université de Genève, 30, quai Ernest-Ansermet,
CH-1211 Genève, Switzerland
| | - Robert Bronisz
- Faculty
of Chemistry, University of Wroclaw, F.
Joliot-Curie 14, 50-383 Wroclaw, Poland
| | - Andreas Hauser
- Département de Chimie Physique, Université de Genève, 30, quai Ernest-Ansermet,
CH-1211 Genève, Switzerland
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18
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Wolny JA, Diller R, Schünemann V. Vibrational Spectroscopy of Mono- and Polynuclear Spin-Crossover Systems. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200059] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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