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Ogou SB, Oke TD, Karimou M, Hontinfinde F, Boukheddaden K. BEG spin-1 model with random exchange magnetic interactions for spin-crossover solids. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 35:455704. [PMID: 37553001 DOI: 10.1088/1361-648x/acee3e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Accepted: 08/07/2023] [Indexed: 08/10/2023]
Abstract
We have investigated magnetic phase diagrams of spin-crossover (SCO) solids throughout the Blume-Emery-Griffiths spin-1 model where the spin states ±1 and 0 are associated to high-spin state and low-spin states respectively. In the present work, the quadrupolar interaction,K, parameter depends linearly on temperature and accounts for the role of the lattice phonons in the elastic interactions between the SCO units. Magnetic interactions are randomly distributed in the system and are controlled by a factorγ=Jij/Ksuch that forγ = 0 (Jij=0), magnetic ordering is not expected. The crystal-field that acts on SCO sites depends both on the ligand-field strength and the degeneracy ratio between HS and LS states as in some previous works. The system is also under the effect of a random local magnetic fieldhiacting on each sitei. The model is solved using a homogeneous mean field theory. Our investigations reveal the occurrence of thermally-induced gradual, and first-order spin-transitions by varying the model parameters. At vicinity of first-order transition, various types of isothermal magnetic hysteresis loops are obtained and their corresponding coercive field and loop patterns are discussed as function of temperature.
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Affiliation(s)
- Saliou Bolarinwa Ogou
- Département de Physique (FAST) et Institut des Mathématiques et de Sciences Physiques (IMSP), Université d'Abomey-Calavi, Abomey Calavi 01 BP 613, Benin
- Groupe d'Études de la Matière Condensée (GEMaC), Université Paris-Saclay, Université de Versailles/St. Quentin en Yvelines-CNRS 45 Avenue des Etats Unis, F78035 Versailles Cedex, France
| | - Toussaint Djidjoho Oke
- Département de Physique (FAST) et Institut des Mathématiques et de Sciences Physiques (IMSP), Université d'Abomey-Calavi, Abomey Calavi 01 BP 613, Benin
- Groupe d'Études de la Matière Condensée (GEMaC), Université Paris-Saclay, Université de Versailles/St. Quentin en Yvelines-CNRS 45 Avenue des Etats Unis, F78035 Versailles Cedex, France
| | - Mounirou Karimou
- Département de Physique (FAST) et Institut des Mathématiques et de Sciences Physiques (IMSP), Université d'Abomey-Calavi, Abomey Calavi 01 BP 613, Benin
- Ecole Nationale Supérieure de Génie Energétique et Procédés (ENSGEP) d'Abomey, Abomey, Benin
| | - Félix Hontinfinde
- Département de Physique (FAST) et Institut des Mathématiques et de Sciences Physiques (IMSP), Université d'Abomey-Calavi, Abomey Calavi 01 BP 613, Benin
| | - Kamel Boukheddaden
- Groupe d'Études de la Matière Condensée (GEMaC), Université Paris-Saclay, Université de Versailles/St. Quentin en Yvelines-CNRS 45 Avenue des Etats Unis, F78035 Versailles Cedex, France
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2
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Martínez Serra A, Dhingra A, Asensio MC, Real JA, Francisco Sánchez Royo J. Is the surface of Hofmann-like spin-crossover {Fe(pz)[Pt(CN) 4]} the same as its bulk? Dalton Trans 2023; 52:10305-10309. [PMID: 37469273 DOI: 10.1039/d3dt01955a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/21/2023]
Abstract
Temperature dependent X-ray photoemission spectroscopy (XPS) has been employed to examine the spin-crossover (SCO) transition in the nanocrystals of 3D Hoffman-like {Fe(pz)[Pt(CN)4]}. Consistent with the existing literature, the temperature-dependent variations in the Fe 2p core-level spectrum provide unambiguous evidence of the spin-state transition in this SCO complex. One of the many possible reasons behind a lack of discernible temperature-driven shifts in the binding energies of both the N 1s core-level components could be the immunity of its HS electronic configuration to thermal fluctuations. The high-spin fraction versus temperature plot, extrapolated from the XPS measurements, reveals that the surface of the nanocrystals of {Fe(pz)[Pt(CN)4]} is in the high-spin state at room temperature, rendering it promising for room-temperature spintronics and quantum information science applications.
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Affiliation(s)
- Alejandro Martínez Serra
- Institut de Ciència dels Materials de la Universitat de València (ICMUV), University of Valencia, Carrer del Catedrátic José Beltrán Martinez, 2, 46980 Paterna, Valencia, Spain.
| | - Archit Dhingra
- Institut de Ciència dels Materials de la Universitat de València (ICMUV), University of Valencia, Carrer del Catedrátic José Beltrán Martinez, 2, 46980 Paterna, Valencia, Spain.
| | - María Carmen Asensio
- Materials Science Institute of Madrid (ICMM/CSIC), Cantoblanco, E-28049 Madrid, Spain
- MATINÉE, the CSIC Associated Unit between the Materials Science Institute (ICMUV) and the ICMM, Cantoblanco, E-28049 Madrid, Spain
| | - José Antonio Real
- Institut de Ciència Molecular (ICMol), University of Valencia, Carrer del Catedrátic José Beltrán Martinez, 2, 46980 Paterna, Valencia, Spain
| | - Juan Francisco Sánchez Royo
- Institut de Ciència dels Materials de la Universitat de València (ICMUV), University of Valencia, Carrer del Catedrátic José Beltrán Martinez, 2, 46980 Paterna, Valencia, Spain.
- MATINÉE, the CSIC Associated Unit between the Materials Science Institute (ICMUV) and the ICMM, Cantoblanco, E-28049 Madrid, Spain
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3
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Zhao J, Yuan J, Fang Z, Huang S, Chen Z, Qiu F, Lu C, Zhu J, Zhuang X. One-dimensional coordination polymers based on metal–nitrogen linkages. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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4
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Steric Quenching of Mn(III) Thermal Spin Crossover: Dilution of Spin Centers in Immobilized Solutions. MAGNETOCHEMISTRY 2022. [DOI: 10.3390/magnetochemistry8010008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Structural and magnetic properties of a new spin crossover complex [Mn(4,6-diOMe-sal2323)]+ in lattices with ClO4−, (1), NO3−, (2), BF4−, (3), CF3SO3−, (4), and Cl− (5) counterions are reported. Comparison with the magnetostructural properties of the C6, C12, C18 and C22 alkylated analogues of the ClO4− salt of [Mn(4,6-diOMe-sal2323)]+ demonstrates that alkylation effectively switches off the thermal spin crossover pathway and the amphiphilic complexes are all high spin. The spin crossover quenching in the amphiphiles is further probed by magnetic, structural and Raman spectroscopic studies of the PF6− salts of the C6, C12 and C18 complexes of a related complex [Mn(3-OMe-sal2323)]+ which confirm a preference for the high spin state in all cases. Structural analysis is used to rationalize the choice of the spin quintet form in the seven amphiphilic complexes and to highlight the non-accessibility of the smaller spin triplet form of the ion more generally in dilute environments. We suggest that lattice pressure is a requirement to stabilize the spin triplet form of Mn3+ as the low spin form is not known to exist in solution.
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Yu ZM, Zhao SZ, Wang YT, Xu PY, Qin CY, Li YH, Zhou XH, Wang S. Anion-driven supramolecular modulation of spin-crossover properties in mononuclear iron(III) Schiff-base complexes. Dalton Trans 2021; 50:15210-15223. [PMID: 34622889 DOI: 10.1039/d1dt02394b] [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
A series of Fe(III) complexes [Fe(5-F-sal-N-1,4,7,10)]Y (Y = PF6- for 1, Y = ClO4- for 2, Y = I- for 3 and Y = NO3- for 4) have been prepared. Single-crystal X-ray crystallographic studies show that complex 1 crystallizes in the orthorhombic Pna21 space group and complexes 2-4 have an isomorphous structure and crystallize in the same monoclinic space group, P21/n. Complexes 2-4 have two independent molecules (Fe1 and Fe2) in the unit cell. Magnetic susceptibility measurements demonstrated that complexes 1 and 3 showed a gradual one-step SCO behavior (T1/2 for 1 = 177 K and for 3 = 227 K) without thermal hysteresis. The magnetic behavior of 2 shows an incomplete two-step SCO process at T1/2 = 114 K and 170 K, respectively, while 4 is in a high-spin state at all measured temperatures. A careful evaluation of the supramolecular structures of these complexes revealed correlation between the supramolecular packing forces and their SCO behavior. The crystal structure of 1 consists of a three-dimensional (3D) extended network constructed from N-H⋯F and C-H⋯F hydrogen bonds, and C-H⋯π and C⋯C short contacts. In compounds 2-4, the crystal packing is governed by C⋯C, C-H⋯π and p-π interactions for the Fe1 centers and by C-H⋯π/O interactions for the Fe2 centers, which form 1D chains. Additional interactions (C-H⋯F and N-H⋯O/I) connect the neighboring chains and planes to form a complex supramolecular network. The anion⋯π interactions in 4 provide a means for preventing SCO occurring at low temperatures. This suggests that the supramolecular connectivity of the anions influences the magnetic properties.
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Affiliation(s)
- Zong-Mei Yu
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
| | - Sheng-Ze Zhao
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
| | - Yu-Ting Wang
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
| | - Peng-Yu Xu
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
| | - Chun-Yan Qin
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
| | - Yong-Hua Li
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
| | - Xin-Hui Zhou
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
| | - Shi Wang
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
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Kipgen L, Bernien M, Tuczek F, Kuch W. Spin-Crossover Molecules on Surfaces: From Isolated Molecules to Ultrathin Films. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2008141. [PMID: 33963619 DOI: 10.1002/adma.202008141] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 01/22/2021] [Indexed: 06/12/2023]
Abstract
Molecular spintronics seeks to use single or few molecules as functional building blocks for spintronic applications, directly relying on molecular properties or properties of interfaces between molecules and inorganic electrodes. Spin-crossover molecules (SCMs) are one of the most promising classes of candidates for molecular spintronics due to their bistability deriving from the existence of two spin states that can be reversibly switched by temperature, light, electric fields, etc. Building devices based on single or few molecules would entail connecting the molecule(s) with solid surfaces and understanding the fundamental behavior of the resulting assemblies. Herein, the investigations of SCMs on solid surfaces, ranging from isolated single molecules (submonolayers) to ultrathin films (mainly in the sub-10 nm range) are summarized. The achievements, challenges and prospects in this field are highlighted.
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Affiliation(s)
- Lalminthang Kipgen
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany
| | - Matthias Bernien
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany
| | - Felix Tuczek
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, 24118, Kiel, Germany
| | - Wolfgang Kuch
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany
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7
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Dey B, Gupta A, Kapurwan S, Konar S. Study of Spin Crossover Property of a Series of X‐OMe‐SalEen (X=6, 5 and 4) Based Fe(III) Complexes. ChemistrySelect 2020. [DOI: 10.1002/slct.202003135] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Bijoy Dey
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal by-pass road Bhauri Bhopal 462066 India
| | - Arindam Gupta
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal by-pass road Bhauri Bhopal 462066 India
| | - Sandhya Kapurwan
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal by-pass road Bhauri Bhopal 462066 India
| | - Sanjit Konar
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal by-pass road Bhauri Bhopal 462066 India
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Exploring the Effects of Synthetic and Postsynthetic Grinding on the Properties of the Spin Crossover Material [Fe(atrz)3](BF4)2 (atrz = 4-Amino-4H-1,2,4-Triazole). MAGNETOCHEMISTRY 2020. [DOI: 10.3390/magnetochemistry6030044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The effects of mechanochemical synthesis and postsynthetic grinding on the spin crossover material [Fe(atrz)3](BF4)2 was examined in detail using a combination of X-ray diffraction, magnetometry, EXAFS and TEM. Mechanochemical synthesis yielded a different polymorph (β-phase) to the solution synthesised sample (α-phase), with a lower temperature spin crossover. Milling duration did not significantly affect this temperature but did result in the production of smaller nanoparticles with a narrower size distribution. It is also possible to convert from α- to the β-phase via postsynthetic grinding.
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9
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Dey B, Mondal A, Konar S. Effect of Ligand Field Strength on the Spin Crossover Behaviour in 5‐X‐SalEen (X=Me, Br and OMe) Based Fe(III) Complexes. Chem Asian J 2020; 15:1709-1721. [DOI: 10.1002/asia.202000156] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 04/14/2020] [Indexed: 11/09/2022]
Affiliation(s)
- Bijoy Dey
- Department of ChemistryIndian Institute of Science Education and Research Bhopal Bhopal bypass road, Bhauri Bhopal 462066, MP India
| | - Arpan Mondal
- Department of ChemistryIndian Institute of Science Education and Research Bhopal Bhopal bypass road, Bhauri Bhopal 462066, MP India
| | - Sanjit Konar
- Department of ChemistryIndian Institute of Science Education and Research Bhopal Bhopal bypass road, Bhauri Bhopal 462066, MP India
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Chakraborty A, Chakraborty A, Ghosh S, Dasgupta I. Theoretical analysis of pressure induced spin crossover phenomenon in a di-nuclear Fe(II) molecular complex. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:165802. [PMID: 31822644 DOI: 10.1088/1361-648x/ab6044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We have studied a Fe-based di-nuclear molecular complex having the chemical formula [{Fe(bpp)(NCS)2}2([Formula: see text]'-bipy)]·2MeOH (where bpp = [Formula: see text]-bis(pyrazol-3-yl) pyridine and [Formula: see text]'-bipy = [Formula: see text]'-bipyridine, 1) using density functional theory and model Hamiltonian approach. Our study provides insight to the pressure driven spin-crossover (SCO) phenomena observed experimentally in these systems. Upon increasing the pressure, the spin state of Fe(II) cation gradually changes from a high spin state (S =2) to a low spin (LS) state (S =0) accompanied by volume contraction. The gradual increase in pressure shrinks Fe-N bond length and also causes angular deviation of the FeN6 octahedron leading to full conversion to the LS state without global structural phase transition. We have carried out exact diagonalization study of an effective single site Hamiltonian and confirmed the importance of intramolecular interaction for SCO phenomena. We have investigated the cooperativity of the observed SCO phenomena. We have also studied the effect of Co doping on the spin state of Fe and find that the spin state of Fe has a subtle dependency on the concentration of dopant atoms. Excess Co doping pave the way towards the possibility of an intermediate spin state for Fe and can give rise to a bistable spin transition process.
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Affiliation(s)
- Atasi Chakraborty
- School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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11
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Light-induced spin transitions in Ni(II)-based macrocyclic-ligand complexes: A DFT study. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2019.03.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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12
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Ogou SB, Oke DT, Hontinfinde F, Boukheddaden K. Dynamical Properties of Spin‐Crossover Solids Within the Kinetic Spin‐1 BEG Model in the Presence of a Time‐Dependent Magnetic Field. ADVANCED THEORY AND SIMULATIONS 2019. [DOI: 10.1002/adts.201800192] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Saliou Bolarinwa Ogou
- Département de Physique (FAST) et Institut des Mathématiques et de Sciences Physiques (IMSP)Université d'Abomey‐Calavi01 BP 613 Porto‐Novo Benin
| | - Djidjoho Toussaint Oke
- Département de Physique (FAST) et Institut des Mathématiques et de Sciences Physiques (IMSP)Université d'Abomey‐Calavi01 BP 613 Porto‐Novo Benin
- Groupe d'Etudes de la Matière CondenséeUniversité Paris‐Saclay, Université de Versailles/St. Quentin en Yvelines‐CNRS45 Avenue des Etats Unis F78035 Versailles Cedex France
| | - Félix Hontinfinde
- Département de Physique (FAST) et Institut des Mathématiques et de Sciences Physiques (IMSP)Université d'Abomey‐Calavi01 BP 613 Porto‐Novo Benin
| | - Kamel Boukheddaden
- Groupe d'Etudes de la Matière CondenséeUniversité Paris‐Saclay, Université de Versailles/St. Quentin en Yvelines‐CNRS45 Avenue des Etats Unis F78035 Versailles Cedex France
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Interfacial Spin Manipulation of Nickel-Quinonoid Complex Adsorbed on Co(001) Substrate. MAGNETOCHEMISTRY 2018. [DOI: 10.3390/magnetochemistry5010002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We studied the structural, electronic, and magnetic properties of a recently synthesized Ni(II)-quinonoid complex upon adsorption on a magnetic Co(001) substrate. Our density functional theory + U (DFT+U) calculations predict that the molecule undergoes a spin-state switching from low-spin S = 0 in the gas phase to high-spin S ≈ 1 when adsorbed on the Co(001) surface. A strong covalent interaction of the quinonoid rings and surface atoms leads to an increase of the Ni–O(N) bond lengths in the chemisorbed molecule that support the spin-state switching. Our DFT+U calculations show that the molecule is ferromagnetically coupled to the substrate. The Co surface–Ni center exchange mechanism was carefully investigated. We identified an indirect exchange interaction via the quinonoid ligands that stabilizes the molecule’s spin moment in ferromagnetic alignment with the Co surface magnetization.
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Komatsumaru Y, Nakaya M, Kobayashi F, Ohtani R, Nakamura M, Lindoy LF, Hayami S. Post-synthetic Modification of a Dinuclear Spin Crossover Iron(III) Complex. Z Anorg Allg Chem 2018. [DOI: 10.1002/zaac.201800087] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Yuki Komatsumaru
- Department of Chemistry; Graduate School of Science and Technology; Kumamoto University; 860-8555 Kumamoto Japan
| | - Manabu Nakaya
- Department of Chemistry; Graduate School of Science and Technology; Kumamoto University; 860-8555 Kumamoto Japan
| | - Fumiya Kobayashi
- Department of Chemistry; Graduate School of Science and Technology; Kumamoto University; 860-8555 Kumamoto Japan
| | - Ryo Ohtani
- Department of Chemistry; Graduate School of Science and Technology; Kumamoto University; 860-8555 Kumamoto Japan
| | - Masaaki Nakamura
- Department of Chemistry; Graduate School of Science and Technology; Kumamoto University; 860-8555 Kumamoto Japan
| | - Leonard F. Lindoy
- School of Chemistry; The University of Sydney; 2006 Sydney, NSW Australia
| | - Shinya Hayami
- Department of Chemistry; Graduate School of Science and Technology; Kumamoto University; 860-8555 Kumamoto Japan
- Institute of Pulsed Power Science (IPPS); Kumamoto University; 860-8555 Kumamoto Japan
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15
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16
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Tsukiashi A, Nakaya M, Kobayashi F, Ohtani R, Nakamura M, Harrowfield JM, Kim Y, Hayami S. Intermolecular Interaction Tuning of Spin-Crossover Iron(III) Complexes with Aromatic Counteranions. Inorg Chem 2018; 57:2834-2842. [PMID: 29461818 DOI: 10.1021/acs.inorgchem.7b03126] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Iron(III) spin-crossover (SCO) complexes [Fe(qsal)2]BS·MeOH·H2O (1), [Fe(qsal)2](NS)·MeOH (2), [Fe(qnal)2](NS) (3), and [Fe(qnal)2]PS·MeOH·CH2Cl2 (4) (Hqsal, N-(8-quinolinyl)salicylaldimine; Hqnal, N-(8-quinolinyl)-2-hydroxy-1-naphthaldimine; BS, benzenesulfonate; NS, 1-naphthalenesulfonate; PS, 1-pyrenesulfonate) have been synthesized and characterized by X-ray structure determinations and temperature-dependent magnetic susceptibility measurements. The aromatic counteranions BS, NS, and PS can be used for the tuning of intermolecular coupling through a variety of weak interactions. All of the complexes show temperature-dependent SCO behavior. but the light-induced excited spin-state trapping (LIESST) effect was observed only for 1, 3, and 4 when the samples were illuminated (λ 808 nm) for 1 h at 5 K. In particular, 59% of the LS form of 1 was converted to the metastable HS state by illumination, equal to the highest degree of conversion yet known for LIESST in [Fe(qsal)2]+ derivatives. The lack of a LIESST effect for 2 may be due to the relatively limited degree of interaction between the cations and anions in the lattice, reflected in a much longer minimum Fe···Fe separation in this complex in comparison to the others.
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Affiliation(s)
- Asami Tsukiashi
- Department of Chemistry, Faculty of Advanced Science and Technology , Kumamoto University , 2-39-1 Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
| | - Manabu Nakaya
- Department of Chemistry, Faculty of Advanced Science and Technology , Kumamoto University , 2-39-1 Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
| | - Fumiya Kobayashi
- Department of Chemistry, Faculty of Advanced Science and Technology , Kumamoto University , 2-39-1 Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
| | - Ryo Ohtani
- Department of Chemistry, Faculty of Advanced Science and Technology , Kumamoto University , 2-39-1 Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
| | - Masaaki Nakamura
- Department of Chemistry, Faculty of Advanced Science and Technology , Kumamoto University , 2-39-1 Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
| | - Jack M Harrowfield
- ISIS , Université de Strasbourg , 8 allée Gaspard Monge , 67083 Strasbourg , France
| | - Yang Kim
- Department of Chemistry, Faculty of Advanced Science and Technology , Kumamoto University , 2-39-1 Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
| | - Shinya Hayami
- Department of Chemistry, Faculty of Advanced Science and Technology , Kumamoto University , 2-39-1 Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan.,Institute of Pulsed Power Science (IPPS) , Kumamoto University , 2-39-1 Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
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17
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Knoll C, Müller D, Seifried M, Giester G, Welch JM, Artner W, Hradil K, Reissner M, Weinberger P. Cooperativity in spin crossover materials as ligand's responsibility – investigations of the Fe(ii) – 1,3-bis((1H-tetrazol-1-yl)methyl)bicyclo[1.1.1]pentane system. Dalton Trans 2018; 47:5553-5557. [DOI: 10.1039/c8dt00781k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
In [Fe(ppditz)3]X2, X = BF4−, ClO4−, PF6− spin crossover complexes the observed cooperativity originates only from the rigidity and internal strain of the ligand.
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Affiliation(s)
- Christian Knoll
- Institute of Applied Synthetic Chemistry
- TU Wien
- 1060 Vienna
- Austria
| | - Danny Müller
- Institute of Applied Synthetic Chemistry
- TU Wien
- 1060 Vienna
- Austria
| | - Marco Seifried
- Institute of Applied Synthetic Chemistry
- TU Wien
- 1060 Vienna
- Austria
| | - Gerald Giester
- Department of Mineralogy and Crystallography
- University of Vienna
- 1090 Vienna
- Austria
| | | | | | | | | | - Peter Weinberger
- Institute of Applied Synthetic Chemistry
- TU Wien
- 1060 Vienna
- Austria
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Wang H, Baldé C, Grosjean A, Desplanches C, Guionneau P, Chastanet G. Seven-coordinated iron(ii) spin-crossover molecules: some learning from iron substitution in [FexMn1−x(L222N3O2)(CN)2]·H2O solid solutions. Dalton Trans 2018; 47:14741-14750. [DOI: 10.1039/c8dt02517g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Temperature dependence of (χMT)Fe for [FexMn1−x(L222N3O2)(CN)2]·H2O of the T(TIESST) experiment with x = 1 (in violet ), 0.949 (in blue ), 0.93 (in red ), 0.912 (in green ), 0.892 (in olive ) and 0.853 (in black ■).
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Affiliation(s)
| | - Chérif Baldé
- Laboratoire de Chimie et Physique des Matériaux (LCPM) Université de Ziguinchor
- Bp: 523 Ziguinchor
- Sénégal
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Structure and Spin State of Iron(II) Assembled Complexes Using 9,10-Bis(4-pyridyl)anthracene as Bridging Ligand. INORGANICS 2017. [DOI: 10.3390/inorganics5030061] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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