1
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Mondal DJ, Kumar B, Shome S, Konar S. Observation of TLIESST above Liquid Nitrogen Temperature and Disclosure of Hidden Hysteresis in Multiresponsive Hofmann-type Coordination Polymers. Inorg Chem 2024; 63:15752-15761. [PMID: 39145691 DOI: 10.1021/acs.inorgchem.4c01675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/16/2024]
Abstract
Photoresponsive spin-crossover (SCO) molecules are an important class of bistable magnetic molecules with intriguing potential in device applications. The light-induced excited spin state trapping (LIESST) and the combined application of light and temperature can provide access to the metastable region of the SCO profile. The primary obstacle in utilizing light stimuli is the manifestation of light-induced trappings at extremely low temperatures. Herein, we report two novel multiresponsive 2D Hofmann-type coordination polymers exhibiting light-induced excited spin state trapping above liquid nitrogen temperature (TLIESST = 82 and 81 K). Stimulating the samples in conjugation with light and temperature successfully unveils hysteresis, which is otherwise concealed. Apart from light and temperature, we found that the SCO phenomenon is also responsive to external hydrostatic pressure and exhibits modulation of the hysteresis width and transition temperature shifts with changes in pressure.
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Affiliation(s)
- Dibya Jyoti Mondal
- Molecular Magnetism Lab, Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal By-pass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
| | - Bhart Kumar
- Molecular Magnetism Lab, Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal By-pass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
| | - Shraoshee Shome
- Molecular Magnetism Lab, Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal By-pass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
| | - Sanjit Konar
- Molecular Magnetism Lab, Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal By-pass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
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2
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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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3
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Seredyuk M, Znovjyak K, Valverde-Muñoz FJ, Muñoz MC, Fritsky IO, Real JA. Rotational order-disorder and spin crossover behaviour in a neutral iron(II) complex based on asymmetrically substituted large planar ionogenic ligand. Dalton Trans 2024; 53:8041-8049. [PMID: 38652019 DOI: 10.1039/d4dt00368c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
Octahedrally coordinated spin crossover (SCO) FeII complexes represent an important class of switchable molecular materials. This study presents the synthesis and characterisation of a novel complex, [FeII(ppt-2Fph)2]0·2MeOH, where ppt-2Fph is a new asymmetric ionogenic tridentate planar ligand 2-(5-(2-fluorophenyl)-4H-1,2,4-triazol-3-yl)-6-(1H-pyrazol-1-yl)pyridine. The complex exhibits a hysteretic thermally induced SCO transition at 285 K on cooling and at 293 K on heating, as well as light induced excited spin state trapping (LIESST) at lower temperatures with a relaxation T(LIESST) temperature of 73 K. Single crystal analysis in both spin states shows that the compound undergoes an unusual partial (25%) reversible order-disorder of the asymmetrically substituted phenyl group coupled to the thermal SCO. The highly cooperative SCO transition, analysed by structural energy framework analysis at the B3LYP/6-31G(d,p) theory level, revealed the co-existence of stabilising and destabilising energy variations in the lattice. The observed antagonism of intermolecular interactions and synchronous rotational disorder, which contributes to the overall entropy change, is suggested to be at the origin of the cooperative SCO transition.
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Affiliation(s)
- Maksym Seredyuk
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, 01601 Kyiv, Ukraine.
- Instituto de Ciencia Molecular, Departamento de Química Inorgánica, Universidad de Valencia, 46980 Paterna, Valencia, Spain.
- Enamine Ltd., Winston Churchill Str. 78, 02094 Kyiv, Ukraine
| | - Kateryna Znovjyak
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, 01601 Kyiv, Ukraine.
| | - Francisco Javier Valverde-Muñoz
- Instituto de Ciencia Molecular, Departamento de Química Inorgánica, Universidad de Valencia, 46980 Paterna, Valencia, Spain.
| | - M Carmen Muñoz
- Departamento de Física Aplicada, Universitat Politècnica de València, Camino de Vera s/n, E-46022, Valencia, Spain
| | - Igor O Fritsky
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, 01601 Kyiv, Ukraine.
| | - José Antonio Real
- Instituto de Ciencia Molecular, Departamento de Química Inorgánica, Universidad de Valencia, 46980 Paterna, Valencia, Spain.
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4
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Resines-Urien E, Fernandez-Bartolome E, Martinez-Martinez A, Gamonal A, Piñeiro-López L, Costa JS. Vapochromic effect in switchable molecular-based spin crossover compounds. Chem Soc Rev 2023; 52:705-727. [PMID: 36484276 DOI: 10.1039/d2cs00790h] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Coordination complexes based on transition metal ions displaying [Ar]3d4-3d7 electronic configurations can undergo the likely most spectacular switchable phenomena found in molecular coordination chemistry, the well-known Spin Crossover (SCO). SCO phenomena is a detectable, reproducible and reversible switch that occurs between the high spin (HS) and low spin (LS) electronic states of the transition metal actuated by different stimuli (i.e. light, temperature, pressure, the presence of an analyte). Moreover, the occurrence of SCO phenomena causes different outputs, one of them being a colour change. Altogether, an analyte in gas form could be detected by naked eye once it has triggered the corresponding HS ↔ LS transition. This vapochromic effect could be used to detect volatile molecules using a low-cost technology, including harmful chemical substances, gases and/or volatile organic compounds (VOCs) that are present in our environment, in our home or at our workplace. The present review condenses all reported iron coordination compounds where the colour change induced by a given molecule in its gas form is coupled to a HS ↔ LS spin transition. Special emphasis has been made on describing the nature of the post-synthetic modification (PSM) taking place in the material upon the analyte uptake. In this case, three types of PSM can be distinguished: based on supramolecular contacts and/or leading to a coordinative or covalent bond. In the latter, a colour change not only indicates the switch of the spin state in the material but also the formation of a new compound with different properties. It is important to indicate that some of the SCO coordination compounds discussed in the current report have been part of other spin crossover reviews, that have gathered thermally induced SCO compounds and the influence of guest molecules on the SCO behaviour. However, in the majority of examples in these reviews, the change of colour upon the uptake of analytes is not associated with a spin transition at room temperature. In addition, the observed colour variations have been mainly discussed in terms of host-guest interactions, when they can also be induced by a PSM taking place in different sites of the molecule, like the Fe(II) coordination sphere or by chemically altering its inorganic and/or organic linkers. Therefore, we present here for the first time an exhaustive compilation of all systems in which the interaction between the coordination compounds and the vapour analytes leads to a colour change due to a spin transition in the metal centre at room temperature.
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5
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Seredyuk M, Znovjyak K, Valverde-Muñoz FJ, da Silva I, Muñoz MC, Moroz YS, Real JA. 105 K Wide Room Temperature Spin Transition Memory Due to a Supramolecular Latch Mechanism. J Am Chem Soc 2022; 144:14297-14309. [PMID: 35900921 PMCID: PMC9380689 DOI: 10.1021/jacs.2c05417] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
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Little is known about the mechanisms behind the bistability
(memory)
of molecular spin transition compounds over broad temperature ranges
(>100 K). To address this point, we report on a new discrete FeII neutral complex [FeIIL2]0 (1) based on a novel asymmetric tridentate ligand 2-(5-(3-methoxy-4H-1,2,4-triazol-3-yl)-6-(1H-pyrazol-1-yl))pyridine
(L). Due to the asymmetric cone-shaped form, in the lattice, the formed
complex molecules stack into a one-dimensional (1D) supramolecular
chain. In the case of the rectangular supramolecular arrangement of
chains in methanolates 1-A and 1-B (both
orthorhombic, Pbcn) differing, respectively, by bent
and extended spatial conformations of the 3-methoxy groups (3MeO),
a moderate cooperativity is observed. In contrast, the hexagonal-like
arrangement of supramolecular chains in polymorph 1-C (monoclinic, P21/c) results in steric coupling of the transforming complex
species with the peripheral flipping 3MeO group. The group acts as
a supramolecular latch, locking the huge geometric distortion of complex 1 and in turn the trigonal distortion of the central FeII ion in the high-spin state, thereby keeping it from the
transition to the low-spin state over a large thermal range. Analysis
of the crystal packing of 1-C reveals significantly changing
patterns of close intermolecular interactions on going between the
phases substantiated by the energy framework analysis. The detected
supramolecular mechanism leads to a record-setting robust 105 K wide
hysteresis spanning the room temperature region and an atypically
large TLIESST relaxation value of 104
K of the photoexcited high-spin state. This work highlights a viable
pathway toward a new generation of cleverly designed molecular memory
materials.
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Affiliation(s)
- Maksym Seredyuk
- Instituto de Ciencia Molecular, Departamento de Química Inorgánica, Universidad de Valencia, 46980 Paterna, Valencia, Spain.,Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, 01601 Kyiv, Ukraine
| | - Kateryna Znovjyak
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, 01601 Kyiv, Ukraine
| | | | - Ivan da Silva
- ISIS Neutron Facility, STFC Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, U.K
| | - M Carmen Muñoz
- Departamento de Fisíca Aplicada, Universitat Politècnica de València, Camino de Vera s/n, E-46022 Valencia, Spain
| | - Yurii S Moroz
- Chemspace Ltd., Chervonotkatska Street 78, 02094 Kyiv, Ukraine.,ChemBio Center, Taras Shevchenko National University of Kyiv, 60, Volodymyrska Street, 01601 Kyiv, Ukraine
| | - José Antonio Real
- Instituto de Ciencia Molecular, Departamento de Química Inorgánica, Universidad de Valencia, 46980 Paterna, Valencia, Spain
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6
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Mei T, Yang D, Di K, Zhang Y, Zhao J, Wang B, Qu J. Synthesis, Characterization, and Catalytic Reactivity of Dithiolate-Bridged Diiron Complexes Supported by Bulky Cyclopentadienyl Ligands. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tao Mei
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
| | - Dawei Yang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
| | - Kai Di
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
| | - Yanpeng Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
| | - Jinfeng Zhao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
| | - Baomin Wang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
| | - Jingping Qu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
- State Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation Center for Biomanufacturing, Frontiers Science Center for Materiobiology and Dynamic Chemistry, East China University of Science and Technology, Shanghai,200231, P. R. China
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7
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Nadeem M, Cruddas J, Ruzzi G, Powell BJ. Toward High-Temperature Light-Induced Spin-State Trapping in Spin-Crossover Materials: The Interplay of Collective and Molecular Effects. J Am Chem Soc 2022; 144:9138-9148. [PMID: 35546521 DOI: 10.1021/jacs.2c03202] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Spin-crossover (SCO) materials display many fascinating behaviors including collective phase transitions and spin-state switching controlled by external stimuli, e.g., light and electrical currents. As single-molecule switches, they have been fêted for numerous practical applications, but these remain largely unrealized-partly because of the difficulty of switching these materials at high temperatures. We introduce a semiempirical microscopic model of SCO materials combining crystal field theory with elastic intermolecular interactions. For realistic parameters, this model reproduces the key experimental results including thermally induced phase transitions, light-induced spin-state trapping (LIESST), and reverse-LIESST. Notably, we reproduce and explain the experimentally observed relationship between the critical temperature of the thermal transition, T1/2, and the highest temperature for which the trapped state is stable, TLIESST, and explain why increasing the stiffness of the coordination sphere increases TLIESST. We propose strategies to design SCO materials with higher TLIESST: optimizing the spin-orbit coupling via heavier atoms (particularly in the inner coordination sphere) and minimizing the enthalpy difference between the high-spin (HS) and low-spin (LS) states. However, the most dramatic increases arise from increasing the cooperativity of the spin-state transition by increasing the rigidity of the crystal. Increased crystal rigidity can also stabilize the HS state to low temperatures on thermal cycling yet leave the LS state stable at high temperatures following, for example, reverse-LIESST. We show that such highly cooperative systems offer a realistic route to robust room-temperature switching, demonstrate this in silico, and discuss material design rationale to realize this.
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Affiliation(s)
- M Nadeem
- School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Jace Cruddas
- School of Physical Sciences, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Gian Ruzzi
- School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Benjamin J Powell
- School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland 4072, Australia
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8
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Kulmaczewski R, Kershaw Cook LJ, Pask CM, Cespedes O, Halcrow MA. Iron(II) Complexes of 4-(Alkyldisulfanyl)-2,6-di(pyrazolyl)pyridine Derivatives. Correlation of Spin-Crossover Cooperativity with Molecular Structure Following Single-Crystal-to-Single-Crystal Desolvation. CRYSTAL GROWTH & DESIGN 2022; 22:1960-1971. [PMID: 35431660 PMCID: PMC9007408 DOI: 10.1021/acs.cgd.2c00005] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 01/24/2022] [Indexed: 06/14/2023]
Abstract
The complex salts [Fe(L 1)2]X2 (1X 2 ; L 1 = 4-(isopropyldisulfanyl)-2,6-bis(pyrazolyl)pyridine; X- = BF4 -, ClO4 -) form solvated crystals from common organic solvents. Crystals of 1X 2 ·Me2CO show abrupt spin transitions near 160 K, with up to 22 K thermal hysteresis. 1X 2 ·Me2CO cocrystallizes with other, less cooperative acetone solvates, which all transform into the same solvent-free materials 1X 2 ·sf upon exposure to air, or mild heating. Conversion of 1X 2 ·Me2CO to 1X 2 ·sf proceeds in a single-crystal to single-crystal fashion. 1X 2 ·sf are not isomorphous with the acetone solvates, and exhibit abrupt spin transitions at low temperature with hysteresis loops of 30-38 K (X- = BF4 -) and 10-20 K (X- = ClO4 -), depending on the measurement method. Interestingly, the desolvation has an opposite effect on the SCO temperature and hysteresis in the two salts. The hysteretic spin transitions in 1X 2 ·Me2CO and 1X 2 ·sf do not involve a crystallographic phase change but are accompanied by a significant rearrangement of the metal coordination sphere. Other solvates 1X 2 ·MeNO2, 1X 2 ·MeCN, and 1X 2 ·H2O are mostly isomorphous with each other and show more gradual spin-crossover equilibria near room temperature. All three of these lattice types have similar unit cell dimensions and contain cations associated into chains through pairwise, intermolecular S···π interactions. Polycrystalline [Fe(L 2)2][BF4]2·MeNO2 (2[BF 4 ] 2 ·MeNO2; L 2 = 4-(methyldisulfanyl)-2,6-bis(pyrazolyl)pyridine) shows an abrupt spin transition just above room temperature, with an unsymmetrical and structured hysteresis loop, whose main features are reversible upon repeated thermal scanning.
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Affiliation(s)
- Rafal Kulmaczewski
- School
of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K.
| | | | - Christopher M. Pask
- School
of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K.
| | - Oscar Cespedes
- School
of Physics and Astronomy, University of
Leeds, E. C. Stoner
Building, Leeds LS2 9JT, U.K.
| | - Malcolm A. Halcrow
- School
of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K.
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9
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Seredyuk M, Znovjyak K, Valverde-Muñoz FJ, Muñoz MC, Fritsky IO, Amirkhanov VM, Real JA. Spin transition and symmetry-breaking in new mononuclear FeII tren-complexes with up to 38 K hysteresis around room temperature. Inorg Chem Front 2022. [DOI: 10.1039/d1qi00941a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New FeII complexes based on the well-known tripodand ligand type undergo abrupt hysteretic spin transition due to the symmetry-breaking in the room temperature region.
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Affiliation(s)
- Maksym Seredyuk
- Departament de Quimica Inorgànica, Institut de Ciencia Molecular (ICMol), Universitat de València, Valencia, Spain
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, 01601, Kyiv, Ukraine
| | - Kateryna Znovjyak
- Departament de Quimica Inorgànica, Institut de Ciencia Molecular (ICMol), Universitat de València, Valencia, Spain
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, 01601, Kyiv, Ukraine
| | | | - M. Carmen Muñoz
- Departamento de Fisica Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain
| | - Igor O. Fritsky
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, 01601, Kyiv, Ukraine
| | - Volodymyr M. Amirkhanov
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, 01601, Kyiv, Ukraine
| | - Jose A. Real
- Departament de Quimica Inorgànica, Institut de Ciencia Molecular (ICMol), Universitat de València, Valencia, Spain
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10
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Fernández-Blanco Á, Mariano LA, Piñeiro-López L, Real JA, Costa JS, Poloni R, Rodríguez-Velamazán JA. Hidden ordered structure in the archetypical Fe(pyrazine)[Pt(CN) 4] spin-crossover porous coordination compound. CrystEngComm 2022. [DOI: 10.1039/d2ce00895e] [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
The actual low-spin state of Fe(pyrazine)Pt(CN)4 implies an ordered arrangement of the pyrazine rings, which significantly affects the spin transition.
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Affiliation(s)
- Ángel Fernández-Blanco
- Institut Laue Langevin, 71 Avenue des Martyrs, CS 20156-38042, Grenoble, France
- Univ. Grenoble Alpes, SIMaP, Grenoble-INP, CNRS, F-38042, Grenoble, France
| | - Lorenzo A. Mariano
- Univ. Grenoble Alpes, SIMaP, Grenoble-INP, CNRS, F-38042, Grenoble, France
| | - Lucía Piñeiro-López
- IMDEA Nanociencia, Faraday 9, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
| | - José Antonio Real
- Departamento de Química Inorgánica, Insituto de Ciencia Molecular (ICMol), Universidad de Valencia, 46980, Paterna, Spain
| | - Jose Sanchez Costa
- IMDEA Nanociencia, Faraday 9, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
| | - Roberta Poloni
- Univ. Grenoble Alpes, SIMaP, Grenoble-INP, CNRS, F-38042, Grenoble, France
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11
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Jornet-Mollá V, Giménez-Saiz C, Yufit DS, Howard JAK, Romero FM. A Reversible Hydrogen-Bond Isomerization Triggered by an Abrupt Spin Crossover near Room Temperature. Chemistry 2021; 27:740-750. [PMID: 32812653 DOI: 10.1002/chem.202003654] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Indexed: 11/10/2022]
Abstract
The spin crossover salt [Fe(bpp)2 ](isonicNO)2 ⋅ 2.4 H2 O (1⋅2.4 H2 O) (bpp=2,6-bis(pyrazol-3-yl)pyridine; isonicNO=isonicotinate N-oxide anion) exhibits a very abrupt spin crossover at T1/2 =274.4 K. This triggers a supramolecular linkage (H-bond) isomerization that responds reversibly towards light irradiation or temperature change. Isotopic effects in the thermomagnetic behavior reveal the importance of hydrogen bonds in defining the magnetic state. Further, the title compound can be reversibly dehydrated to afford 1, a material that also exhibits spin crossover coupled to H-bond isomerization, leading to strong kinetic effects in the thermomagnetic properties.
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Affiliation(s)
- Verónica Jornet-Mollá
- Instituto de Ciencia Molecular, Universitat de València, P. O. Box 22085, 46071, Valencia, Spain
| | - Carlos Giménez-Saiz
- Instituto de Ciencia Molecular, Universitat de València, P. O. Box 22085, 46071, Valencia, Spain
| | - Dmitry S Yufit
- Department of Chemistry, Durham University, Durham, DH1 3LE, UK
| | | | - Francisco M Romero
- Instituto de Ciencia Molecular, Universitat de València, P. O. Box 22085, 46071, Valencia, Spain
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12
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Fernandez-Bartolome E, Resines-Urien E, Murillo-Vidal M, Piñeiro-Lopez L, Sánchez Costa J. Sequential single-crystal-to-single-crystal vapochromic inclusion in a nonporous coordination polymer: unravelling dynamic rearrangement for selective pyridine sensing. Inorg Chem Front 2021. [DOI: 10.1039/d1qi00059d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Unprecedent selective and reversible pyridine solid–vapor sequential inclusion in a nonporous Fe(ii) coordination polymer accompanied by a color change is presented. Although the internal reorganization is significant, the process remains SCSC.
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13
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Sugiyarto KH, Onggo D, Akutsu H, Reddy VR, Sutrisno H, Nakazawa Y, Bhattacharjee A. Structural, magnetic and Mössbauer spectroscopic studies of the [Fe(3-bpp) 2](CF 3COO) 2 complex: role of crystal packing leading to an incomplete Fe( ii) high spin ⇋ low spin transition. CrystEngComm 2021. [DOI: 10.1039/d0ce01687j] [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
Mononuclear complex [Fe(3-bpp)2](CF3COO)2 exhibits a thermal (HS + HS) ⇋ (HS + LS) transition at ∼226 K which is not associated with any crystallographic transition.
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Affiliation(s)
| | - Djulia Onggo
- Inorganic and Physical Chemistry Research Division
- Institut Teknologi
- Bandung
- Indonesia
| | - Hiroki Akutsu
- Graduate School of Science
- Osaka University
- Osaka
- Japan
| | | | - Hari Sutrisno
- Department of Chemistry Education
- Yogyakarta State University
- Indonesia
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14
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Jornet-Mollá V, Giménez-Saiz C, Cañadillas-Delgado L, Yufit DS, Howard JAK, Romero FM. Interplay between spin crossover and proton migration along short strong hydrogen bonds. Chem Sci 2020; 12:1038-1053. [PMID: 34163870 PMCID: PMC8179063 DOI: 10.1039/d0sc04918b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Accepted: 11/16/2020] [Indexed: 12/19/2022] Open
Abstract
The iron(ii) salt [Fe(bpp)2](isonicNO)2·HisonicNO·5H2O (1) (bpp = 2,6-bis(pyrazol-3-yl)pyridine; isonicNO = isonicotinate N-oxide anion) undergoes a partial spin crossover (SCO) with symmetry breaking at T 1 = 167 K to a mixed-spin phase (50% high-spin (HS), 50% low-spin (LS)) that is metastable below T 2 = 116 K. Annealing the compound at lower temperatures results in a 100% LS phase that differs from the initial HS phase in the formation of a hydrogen bond (HB) between two water molecules (O4W and O5W) of crystallisation. Neutron crystallography experiments have also evidenced a proton displacement inside a short strong hydrogen bond (SSHB) between two isonicNO anions. Both phenomena can also be detected in the mixed-spin phase. 1 undergoes a light-induced excited-state spin trapping (LIESST) of the 100% HS phase, with breaking of the O4W⋯O5W HB and the onset of proton static disorder in the SSHB, indicating the presence of a light-induced activation energy barrier for proton motion. This excited state shows a stepped relaxation at T 1(LIESST) = 68 K and T 2(LIESST) = 76 K. Photocrystallography measurements after the first relaxation step reveal a single Fe site with an intermediate geometry, resulting from the random distribution of the HS and LS sites throughout the lattice.
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Affiliation(s)
- Verónica Jornet-Mollá
- Instituto de Ciencia Molecular, Universitat de València P. O. Box 22085 46071 València Spain
| | - Carlos Giménez-Saiz
- Instituto de Ciencia Molecular, Universitat de València P. O. Box 22085 46071 València Spain
| | | | - Dmitry S Yufit
- Department of Chemistry, Durham University Durham DH1 3LE UK
| | | | - Francisco M Romero
- Instituto de Ciencia Molecular, Universitat de València P. O. Box 22085 46071 València Spain
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15
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Guo W, Daro N, Pillet S, Marchivie M, Bendeif EE, Tailleur E, Chainok K, Denux D, Chastanet G, Guionneau P. Unprecedented Reverse Volume Expansion in Spin-Transition Crystals. Chemistry 2020; 26:12927-12930. [PMID: 32428382 DOI: 10.1002/chem.202001821] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 05/04/2020] [Indexed: 11/09/2022]
Abstract
The current craze for research around the spin crossover phenomenon can be justified to some extent by the mechanical properties due to the decrease of volume associated with the transition of the metal ion from the HS state to the LS state. As demonstrated here, the molecular complex [Fe(PM-pBrA)2 (NCS)2 ] exhibits, on the contrary, an increase of the unit-cell volume from HS to LS. This counter-intuitive and unprecedented behavior that concerns both the thermal and the photoexcited spin conversions is revealed by a combination of single-crystal and powder X-ray diffraction complemented by magnetic measurements. Interestingly, this abnormal volume change appears concomitant with the wide rotation of a phenyl ring which induces a drastic modification, though reversible, of the structural packing within the crystal. In addition, the light-induced HS state obtained through the Light-Induced Excited Spin-State Trapping shows a remarkably high relaxation temperature, namely T(LIESST), of 109 K, one of the highest so far reported. The above set of quite unusual characteristics opens up new fields of possibilities within the development of spin crossover materials.
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Affiliation(s)
- Wenbin Guo
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, 33600, Pessac, France
| | - Nathalie Daro
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, 33600, Pessac, France
| | - Sébastien Pillet
- Université de Lorraine, CNRS, CRM2, Nancy, 254506, Vandoeuvre-les-Nancy, France
| | - Mathieu Marchivie
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, 33600, Pessac, France
| | - El-Eulmi Bendeif
- Université de Lorraine, CNRS, CRM2, Nancy, 254506, Vandoeuvre-les-Nancy, France
| | - Elodie Tailleur
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, 33600, Pessac, France
| | - Kittipong Chainok
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, 33600, Pessac, France.,Materials and Textiles Technology, Faculty of Science and Technology, Thammasat University, Khlong Luang, Pathum Thani, 12121, Thailand
| | - Dominique Denux
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, 33600, Pessac, France
| | | | - Philippe Guionneau
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, 33600, Pessac, France
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16
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Pask CM, Greatorex S, Kulmaczewski R, Baldansuren A, McInnes EJL, Bamiduro F, Yamada M, Yoshinari N, Konno T, Halcrow MA. Elucidating the Structural Chemistry of a Hysteretic Iron(II) Spin-Crossover Compound From its Copper(II) and Zinc(II) Congeners. Chemistry 2020; 26:4833-4841. [PMID: 32017244 DOI: 10.1002/chem.202000101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Indexed: 11/12/2022]
Abstract
Annealing [FeL2 ][BF4 ]2 ⋅2 H2 O (L=2,6-bis-[5-methyl-1H-pyrazol-3-yl]pyridine) affords an anhydrous material, which undergoes a spin transition at T1/2 =205 K with a 65 K thermal hysteresis loop. This occurs through a sequence of phase changes, which were monitored by powder diffraction in an earlier study. [CuL2 ][BF4 ]2 ⋅2 H2 O and [ZnL2 ][BF4 ]2 ⋅2 H2 O are not perfectly isostructural but, unlike the iron compound, they undergo single-crystal-to-single-crystal dehydration upon annealing. All the annealed compounds initially adopt the same tetragonal phase but undergo a phase change near room temperature upon re-cooling. The low-temperature phase of [CuL2 ][BF4 ]2 involves ordering of its Jahn-Teller distortion, to a monoclinic lattice with three unique cation sites. The zinc compound adopts a different, triclinic low-temperature phase with significant twisting of its coordination sphere, which unexpectedly becomes more pronounced as the crystal is cooled. Synchrotron powder diffraction data confirm that the structural changes in the anhydrous zinc complex are reproduced in the high-spin iron compound, before the onset of spin-crossover. This will contribute to the wide hysteresis in the spin transition of the iron complex. EPR spectra of copper-doped [Fe0.97 Cu0.03 L2 ][BF4 ]2 imply its low-spin phase contains two distinct cation environments in a 2:1 ratio.
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Affiliation(s)
- Christopher M Pask
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Sam Greatorex
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Rafal Kulmaczewski
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Amgalanbaatar Baldansuren
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.,current address: Chemistry and Chemical Biology, 120 Cogswell, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, NY, 12180, USA
| | - Eric J L McInnes
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Faith Bamiduro
- School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK
| | - Mihoko Yamada
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043, Japan.,current address: Division of Materials Science, Graduate School of Science and Technology, Nara Institute of Science and Technology, Ikoma, Nara, 630-0192, Japan
| | - Nobuto Yoshinari
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043, Japan
| | - Takumi Konno
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043, Japan
| | - Malcolm A Halcrow
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK.,Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043, Japan
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17
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Książek M, Weselski M, Dreczko A, Maliuzhenko V, Kaźmierczak M, Tołoczko A, Kusz J, Bronisz R. Two ways of spin crossover in an iron(ii) coordination polymer associated with conformational changes of a bridging ligand. Dalton Trans 2020; 49:9811-9819. [DOI: 10.1039/d0dt01696a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Structural phase transition in [Fe(bbtre)3](ClO4)2·2CH3CN (bbtre = 1,4-di(1-ethyl-1,2,3-triazol-5-yl)butane) plays the role of a switch, allowing spin crossover to be carried out in two ways.
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Affiliation(s)
- Maria Książek
- Institute of Physics
- University of Silesia
- 41-500 Chorzów
- Poland
| | - Marek Weselski
- Faculty of Chemistry
- University of Wrocław
- 50-383 Wrocław
- Poland
| | | | | | | | | | - Joachim Kusz
- Institute of Physics
- University of Silesia
- 41-500 Chorzów
- Poland
| | - Robert Bronisz
- Faculty of Chemistry
- University of Wrocław
- 50-383 Wrocław
- Poland
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18
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Kashiro A, Some K, Kobayashi Y, Ishida T. Iron(II) and 1,1,1-Tris(2-pyridyl)nonadecane Complex Showing an Order-Disorder-Type Structural Transition and Spin-Crossover Synchronized over Both Conformers. Inorg Chem 2019; 58:7672-7676. [PMID: 31185543 DOI: 10.1021/acs.inorgchem.9b01146] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The title compound (Me4N)[Fe{(2-py)3C- n-C18H37}(NCS)3] having a C18 chain underwent spin-crossover (SCO). There are two crystallographically independent molecules in a triclinic cell at 100 K but only one in a monoclinic cell at 300 K. The complex showed a gradual one-step SCO in the same temperature region as that of the structural transition. The SCO is supported with the 57Fe Mössbauer spectroscopy. The molecules are differentiated on cooling, but the SCO was synchronized.
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Affiliation(s)
- Atsushi Kashiro
- Department of Engineering Science , The University of Electro-Communications , Chofu , Tokyo 182-8585 , Japan
| | - Kanako Some
- Department of Engineering Science , The University of Electro-Communications , Chofu , Tokyo 182-8585 , Japan
| | - Yoshio Kobayashi
- Department of Engineering Science , The University of Electro-Communications , Chofu , Tokyo 182-8585 , Japan
| | - Takayuki Ishida
- Department of Engineering Science , The University of Electro-Communications , Chofu , Tokyo 182-8585 , Japan
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19
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Książek M, Weselski M, Ilczyszyn M, Kusz J, Bronisz R. Sliding Polymeric Layers and Anion Displacement Coupled with Spin Crossover in Two-Dimensional Networks of [Fe(hbtz) 2 (CH 3 CN) 2 ](BF 4 ) 2. Chemistry 2019; 25:2250-2261. [PMID: 30637819 DOI: 10.1002/chem.201804721] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Revised: 11/14/2018] [Indexed: 11/08/2022]
Abstract
The abrupt high spin (HS)→low spin (LS) transition (T↓ 1/2 =136 K) in [Fe(hbtz)2 (CH3 CN)2 ](BF4 )2 (hbtz=1,6-di(tetrazol-2-yl)hexane) is finished at 100 K and further thermal treatment influences the spin crossover. Subsequent heating involves a change of the spin state in the same way (T↑ 1/2 =136 K) on cooling. In contrast, cooling below 100 K triggers different behavior and T↑ 1/2 is shifted to 170 K. The extraordinary structural changes that occurred below 100 K are responsible for the observed diversity of properties. A unique feature of the low-temperature phase is the rebuilding of the anion network expressed by a shift of anions inside the polymeric layer at a distance of 1.2 Å as well as the relative shift of neighboring layers at over 4 Å. These structural alterations, connected with a phase transition, become the origin of the strain, which in most cases causes crystal cleaving. In a sample composed from crystals crushed as a result of the phase transition or as a result of mechanical crumbling, the hysteresis loop vanishes; however, annealing the sample allows to its partial restoration. A replacement of acetonitrile by other nitriles leads to preservation of the polymeric structure and spin crossover, but no phase transition follows.
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Affiliation(s)
- Maria Książek
- Institute of Physics, University of Silesia, 40-007, Katowice, Poland
| | - Marek Weselski
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383, Wrocław, Poland
| | - Maria Ilczyszyn
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383, Wrocław, Poland
| | - Joachim Kusz
- Institute of Physics, University of Silesia, 40-007, Katowice, Poland
| | - Robert Bronisz
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383, Wrocław, Poland
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20
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Weselski M, Książek M, Mess P, Kusz J, Bronisz R. “Normal” and “reverse” spin crossover induced by two different structural events in iron(ii) coordination polymer. Chem Commun (Camb) 2019; 55:7033-7036. [DOI: 10.1039/c9cc02755f] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Conformational changes of the bridging ligand and reorientation of the anions are associated with a sequence of HT(HS) ⇆ HT(HS/LS) ⇆ IP(HS) ⇆ LT(LS) transitions accompanied by existence of two hysteresis loops, “normal” and “reverse”, separated by a region of the stability of the HS form.
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Affiliation(s)
| | | | - Pamela Mess
- Faculty of Chemistry
- University of Wrocław
- Wrocław
- Poland
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21
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Bartual-Murgui C, Diego R, Vela S, Teat SJ, Roubeau O, Aromí G. A Spin-Crossover Molecular Material Describing Four Distinct Thermal Pathways. Inorg Chem 2018; 57:11019-11026. [DOI: 10.1021/acs.inorgchem.8b01625] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Carlos Bartual-Murgui
- Departament de Química Inorgànica i Orgànica, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
| | - Rosa Diego
- Departament de Química Inorgànica i Orgànica, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
- Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona 08007 Barcelona, Spain
| | - Sergi Vela
- Laboratoire de Chimie Quantique, UMR 7177, CNRS-Université de Strasbourg, 4 rue Blaise Pascal, F-67000 Strasbourg, France
| | - Simon J. Teat
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Olivier Roubeau
- Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
| | - Guillem Aromí
- Departament de Química Inorgànica i Orgànica, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
- Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona 08007 Barcelona, Spain
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22
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Moneo-Corcuera A, Nieto-Castro D, Sáenz de Pipaón C, Gómez V, Maldonado-Illescas P, Galan-Mascaros JR. Tuning the spin crossover behavior of the polyanion [(H2O)6Fe3(μ-L)6]6–: the case of the cesium salt. Dalton Trans 2018; 47:11895-11902. [DOI: 10.1039/c8dt01339j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cation exchange transforms the gradual spin transition of the trimer [(H2O)6Fe3(μ-L)6]6– into an abrupt transition with a wide hysteresis above room temperature.
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Affiliation(s)
- Andrea Moneo-Corcuera
- Institute of Chemical Research of Catalonia (ICIQ)
- The Barcelona Institute of Science and Technology (BIST)
- 43007 Tarragona
- Spain
| | - David Nieto-Castro
- Institute of Chemical Research of Catalonia (ICIQ)
- The Barcelona Institute of Science and Technology (BIST)
- 43007 Tarragona
- Spain
| | - Cristina Sáenz de Pipaón
- Institute of Chemical Research of Catalonia (ICIQ)
- The Barcelona Institute of Science and Technology (BIST)
- 43007 Tarragona
- Spain
| | - Verónica Gómez
- Institute of Chemical Research of Catalonia (ICIQ)
- The Barcelona Institute of Science and Technology (BIST)
- 43007 Tarragona
- Spain
| | - Pilar Maldonado-Illescas
- Institute of Chemical Research of Catalonia (ICIQ)
- The Barcelona Institute of Science and Technology (BIST)
- 43007 Tarragona
- Spain
| | - Jose Ramon Galan-Mascaros
- Institute of Chemical Research of Catalonia (ICIQ)
- The Barcelona Institute of Science and Technology (BIST)
- 43007 Tarragona
- Spain
- ICREA
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23
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García-López V, Palacios-Corella M, Abhervé A, Pellicer-Carreño I, Desplanches C, Clemente-León M, Coronado E. Spin-crossover compounds based on iron(ii) complexes of 2,6-bis(pyrazol-1-yl)pyridine (bpp) functionalized with carboxylic acid and ethyl carboxylic acid. Dalton Trans 2018; 47:16958-16968. [DOI: 10.1039/c8dt03511c] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New salts of the iron(ii) bppCOOH and bppCOOEt spin crossover complexes have been studied.
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Affiliation(s)
- Víctor García-López
- Instituto de Ciencia Molecular (ICMol)
- Universidad de Valencia
- 46980 Paterna
- Spain
| | | | - Alexandre Abhervé
- Instituto de Ciencia Molecular (ICMol)
- Universidad de Valencia
- 46980 Paterna
- Spain
| | | | | | | | - Eugenio Coronado
- Instituto de Ciencia Molecular (ICMol)
- Universidad de Valencia
- 46980 Paterna
- Spain
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24
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Phonsri W, Harding P, Liu L, Telfer SG, Murray KS, Moubaraki B, Ross TM, Jameson GNL, Harding DJ. Solvent modified spin crossover in an iron(iii) complex: phase changes and an exceptionally wide hysteresis. Chem Sci 2017; 8:3949-3959. [PMID: 28553537 PMCID: PMC5433504 DOI: 10.1039/c6sc05317c] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Accepted: 03/20/2017] [Indexed: 12/01/2022] Open
Abstract
Solvent effects in a series of Fe(iii) spin crossover (SCO) complexes [Fe(qsal-I)2]OTf·sol (sol = MeOH 1, EtOH 2, n-PrOH 3, i-PrOH 4, acetone 5 and MeCN 6) are explored. SCO is abrupt in 1 (following MeOH loss) and 2, gradual for 3 (T1/2 = 199 K) and 4 (T1/2 = 251 K) and incomplete, even up to 350 K, for 5 and 6. In [Fe(qsal-I)2]OTf SCO occurs at T1/2↓ = 225 K and T1/2↑ = 234 K (ΔT = 9 K), while aged samples of 2 exhibit an exceptionally wide hysteresis of 80 K (T1/2↓ = 139 K and T1/2↑ = 219 K). In contrast, fresh samples of 2 exhibit stepped SCO with hysteresis varying from 2 to 42 K. VT-PXRD (variable temperature powder X-ray diffraction) studies indicate a new phase, 2b, is formed upon cooling below 180 K along with a minor LS phase 2c. Phase 2c and the HS phase 2a undergo a spin transition at T1/2↓ = 180 K and T1/2↑ = 215 K with phase 2b exhibiting two-step SCO. Structural studies in both spin states, except 6, show the cations are linked through extensive π-π interactions to form 1D chains. A combination of P4AE (parallel fourfold aryl embrace) and I···X (X = I, O, π) interactions create tightly packed 3D supramolecular networks. This study emphasizes that while solvent may result in only small structural changes SCO characteristics can be impacted dramatically.
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Affiliation(s)
- Wasinee Phonsri
- Functional Materials and Nanotechnology Centre of Excellence (FuNTech) , Walailak University , Thasala , Nakhon Si Thammarat 80160 , Thailand .
| | - Phimphaka Harding
- Functional Materials and Nanotechnology Centre of Excellence (FuNTech) , Walailak University , Thasala , Nakhon Si Thammarat 80160 , Thailand .
| | - Lujia Liu
- MacDiarmid Institute for Advanced Materials and Nanotechnology , Institute of Fundamental Sciences , Massey University , Palmerston North , New Zealand
| | - Shane G Telfer
- MacDiarmid Institute for Advanced Materials and Nanotechnology , Institute of Fundamental Sciences , Massey University , Palmerston North , New Zealand
| | - Keith S Murray
- School of Chemistry , Monash University , Clayton , Melbourne , Victoria 3800 , Australia
| | - Boujemaa Moubaraki
- School of Chemistry , Monash University , Clayton , Melbourne , Victoria 3800 , Australia
| | - Tamsyn M Ross
- Australian Synchrotron , 800 Blackburn Rd , Clayton , Victoria 3168 , Australia
| | - Guy N L Jameson
- Department of Chemistry & MacDiarmid Institute for Advanced Materials and Nanotechnology , University of Otago , PO Box 56 , Dunedin , 9054 , New Zealand
| | - David J Harding
- Functional Materials and Nanotechnology Centre of Excellence (FuNTech) , Walailak University , Thasala , Nakhon Si Thammarat 80160 , Thailand .
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25
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Weselski M, Książek M, Kusz J, Białońska A, Paliwoda D, Hanfland M, Rudolf MF, Ciunik Z, Bronisz R. Evidence of Ligand Elasticity Occurring in Temperature‐, Light‐, and Pressure‐Induced Spin Crossover in 1D Coordination Polymers [Fe(3ditz)
3
]X
2
(X = ClO
4
–
, BF
4
–
). Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201601399] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Marek Weselski
- Faculty of Chemistry University of Wrocław F. Joliot‐Curie 14 50‐383 Wrocław Poland
| | - Maria Książek
- Institute of Physics University of Silesia Uniwersytecka 4 40‐007 Katowice Poland
| | - Joachim Kusz
- Institute of Physics University of Silesia Uniwersytecka 4 40‐007 Katowice Poland
| | - Agata Białońska
- Faculty of Chemistry University of Wrocław F. Joliot‐Curie 14 50‐383 Wrocław Poland
| | - Damian Paliwoda
- ESRF – The European Synchrotron CS40220 38043 Grenoble Cedex 9 France
| | - Michael Hanfland
- ESRF – The European Synchrotron CS40220 38043 Grenoble Cedex 9 France
| | - Mikołaj F. Rudolf
- Faculty of Chemistry University of Wrocław F. Joliot‐Curie 14 50‐383 Wrocław Poland
| | - Zbigniew Ciunik
- Faculty of Chemistry University of Wrocław F. Joliot‐Curie 14 50‐383 Wrocław Poland
| | - Robert Bronisz
- Faculty of Chemistry University of Wrocław F. Joliot‐Curie 14 50‐383 Wrocław Poland
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26
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Tailleur E, Marchivie M, Daro N, Chastanet G, Guionneau P. Thermal spin-crossover with a large hysteresis spanning room temperature in a mononuclear complex. Chem Commun (Camb) 2017; 53:4763-4766. [DOI: 10.1039/c7cc01806a] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The substitution of sulphur by selenium leads to spin-crossover single-crystals exhibiting a large hysteresis centred at room temperature.
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Affiliation(s)
- E. Tailleur
- CNRS
- Univ. Bordeaux
- ICMCB
- UPR 9048
- F-33608 Pessac
| | | | - N. Daro
- CNRS
- Univ. Bordeaux
- ICMCB
- UPR 9048
- F-33608 Pessac
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27
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Phukkaphan N, Cruickshank DL, Murray KS, Phonsri W, Harding P, Harding DJ. Hysteretic spin crossover driven by anion conformational change. Chem Commun (Camb) 2017; 53:9801-9804. [DOI: 10.1039/c7cc05998a] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An air stable FeIII complex showing a wide hysteresis near room temperature is described. The origin of the cooperativity is an unprecedented anion conformational change.
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Affiliation(s)
- Natnaree Phukkaphan
- Functional Materials and Nanotechnology Center of Excellence
- Walailak University
- Thasala
- Thailand
| | | | | | | | - Phimphaka Harding
- Functional Materials and Nanotechnology Center of Excellence
- Walailak University
- Thasala
- Thailand
| | - David J. Harding
- Functional Materials and Nanotechnology Center of Excellence
- Walailak University
- Thasala
- Thailand
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28
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Bartual-Murgui C, Codina C, Roubeau O, Aromí G. A Sequential Method to Prepare Polymorphs and Solvatomorphs of [Fe(1,3-bpp)2
](ClO4
)2
⋅n
H2
O (n
=0, 1, 2) with Varying Spin-Crossover Behaviour. Chemistry 2016; 22:12767-76. [DOI: 10.1002/chem.201601843] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Carlos Bartual-Murgui
- Departement de Inorgánica; Universitat de Barcelona; Diagonal 645 08028 Barcelona Spain
| | - Carlota Codina
- Departement de Inorgánica; Universitat de Barcelona; Diagonal 645 08028 Barcelona Spain
| | - Olivier Roubeau
- Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC and; Universidad de Zaragoza; Plaza San Francisco s/n 50009 Zaragoza Spain
| | - Guillem Aromí
- Departement de Inorgánica; Universitat de Barcelona; Diagonal 645 08028 Barcelona Spain
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Darawsheh M, Barrios LA, Roubeau O, Teat SJ, Aromí G. Guest-, Light- and Thermally-Modulated Spin Crossover in [FeII2] Supramolecular Helicates. Chemistry 2016; 22:8635-45. [DOI: 10.1002/chem.201601080] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Mohanad Darawsheh
- Departement de Inorgánica; Universitat de Barcelona; Diagonal 645 08028 Barcelona Spain
| | - Leoni A. Barrios
- Departement de Inorgánica; Universitat de Barcelona; Diagonal 645 08028 Barcelona Spain
| | - Olivier Roubeau
- Instituto de Ciencia de Materiales de Aragón (ICMA); CSIC and Universidad de Zaragoza; Plaza San Francisco s/n 50009 Zaragoza Spain
| | - Simon J. Teat
- Advanced Light Source; Berkeley Laboratory; 1 Cyclotron Road Berkeley California 94720 USA
| | - Guillem Aromí
- Departement de Inorgánica; Universitat de Barcelona; Diagonal 645 08028 Barcelona Spain
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Barrios LA, Bartual-Murgui C, Peyrecave-Lleixà E, Le Guennic B, Teat SJ, Roubeau O, Aromí G. Homoleptic versus Heteroleptic Formation of Mononuclear Fe(II) Complexes with Tris-Imine Ligands. Inorg Chem 2016; 55:4110-6. [PMID: 27074060 DOI: 10.1021/acs.inorgchem.5b02058] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We show a marked tendency of Fe(II) to form heteroleptic [Fe(L)(L')](ClO4)2 complexes from pairs of chelating tris-imine 3bpp, tpy, or 2bbp ligands. New synthetic avenues for spin crossover research become thus available, here illustrated with three new heteroleptic compounds with differing magnetic behaviors: [Fe(H4L1)(Cl-tpy)](ClO4)2·C3H6O (1), [Fe(H2L3)(Me3bpp)](ClO4)2·C3H6O (2), [Fe(H4L1)(2bbp)](ClO4)2·3C3H6O (3). Structural studies demonstrate that 1 is in the low-spin (LS) state up to 350 K, while complexes 2 and 3 are, by contrast, in the high-spin (HS) state down to 2 K, as corroborated through magnetic susceptibility measurements. Upon exposure to the atmosphere, the latter exhibits the release of three molecules of acetone per complex, turning into the solvent-free analogue [Fe(H4L1)(2bbp)](ClO4)2 (3a), through a single-crystal-to-single-crystal transformation. This guest extrusion process is accompanied by a spin switch, from HS to LS.
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Affiliation(s)
- Leoní A Barrios
- Departament de Química Inorgánica, Universitat de Barcelona , Diagonal 645, 08028, Barcelona, Spain
| | - Carlos Bartual-Murgui
- Departament de Química Inorgánica, Universitat de Barcelona , Diagonal 645, 08028, Barcelona, Spain.,Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC and Universidad de Zaragoza , Plaza San Francisco s/n, 50009 Zaragoza, Spain
| | - Eugènia Peyrecave-Lleixà
- Departament de Química Inorgánica, Universitat de Barcelona , Diagonal 645, 08028, Barcelona, Spain
| | - Boris Le Guennic
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS-Université de Rennes 1 , 263 Avenue du Général Leclerc, 35042 Cedex Rennes, France
| | - Simon J Teat
- Advanced Light Source, Lawrence Berkeley National Lab , 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
| | - Guillem Aromí
- Departament de Química Inorgánica, Universitat de Barcelona , Diagonal 645, 08028, Barcelona, Spain
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31
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A High Pressure Investigation of the Order-Disorder Phase Transition and Accompanying Spin Crossover in [FeL12](ClO4)2 (L1 = 2,6-bis{3-methylpyrazol-1-yl}-pyrazine). MAGNETOCHEMISTRY 2016. [DOI: 10.3390/magnetochemistry2010009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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32
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Aromí G, Beavers CM, Sánchez Costa J, Craig GA, Mínguez Espallargas G, Orera A, Roubeau O. Snapshots of a solid-state transformation: coexistence of three phases trapped in one crystal. Chem Sci 2016; 7:2907-2915. [PMID: 30090284 PMCID: PMC6054035 DOI: 10.1039/c5sc04287a] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 01/05/2016] [Indexed: 01/10/2023] Open
Abstract
Solvent extrusion leads to crystallographic–magnetic transition within a molecular complex via an intermediate that can be trapped and characterized.
Crystal-to-crystal transformations have been crucial in the understanding of solid-state processes, since these may be studied in detail by means of single crystal X-ray diffraction (SCXRD) techniques. The description of the mechanisms and potential intermediates of those processes remains very challenging. In fact, solid-state transient states have rarely been observed, at least to a sufficient level of detail. We have investigated the process of guest extrusion from the non-porous molecular material [Fe(bpp)(H2L)](ClO4)2·1.5C3H6O (bpp = 2,6-bis(pyrazol-3-yl)pyridine; H2L = 2,6-bis(5-(2-methoxyphenyl)-pyrazol-3-yl)pyridine; C3H6O = acetone), which occurs through ordered diffusion of acetone in a crystal-to-crystal manner, leading to dramatic structural changes. The slow kinetics of the transition allows thermal trapping of the system at various intermediate stages. The transiting single crystal can be then examined at these points through synchrotron SCXRD, offering a window upon the mechanism of the transformation at the molecular scale. These experiments have unveiled the development of an ordered intermediate phase, distinct from the initial and the final states, coexisting as the process advances with either of these two phases or, at a certain moment with both of them. The new intermediate phase has been structurally characterized in full detail by SCXRD, providing insights into the mechanism of this diffusion triggered solid-state phenomenon. The process has been also followed by calorimetry, optical microscopy, local Raman spectroscopy and powder X-ray diffraction. The discovery and description of an intermediate ordered state in a molecular solid-state transformation is of great interest and will help to understand the mechanistic details and reaction pathways underlying these transformations.
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Affiliation(s)
- G Aromí
- Departament de Química Inorgànica , Universitat de Barcelona , Diagonal 645 , 08028 Barcelona , Spain .
| | - C M Beavers
- Advanced Light Source , Berkeley Laboratory , 1 Cyclotron Road , Berkeley , CA 94720 , USA .
| | - J Sánchez Costa
- Departament de Química Inorgànica , Universitat de Barcelona , Diagonal 645 , 08028 Barcelona , Spain .
| | - G A Craig
- Departament de Química Inorgànica , Universitat de Barcelona , Diagonal 645 , 08028 Barcelona , Spain .
| | - G Mínguez Espallargas
- Instituto de Ciencia Molecular (ICMol) , Universidad de Valencia , c/ Catedrático José Beltrán, 2 , 46980 Paterna , Spain
| | - A Orera
- 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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33
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Qin LF, Pang CY, Han WK, Zhang FL, Tian L, Gu ZG, Ren X, Li Z. Spin crossover properties of enantiomers, co-enantiomers, racemates, and co-racemates. Dalton Trans 2016; 45:7340-8. [DOI: 10.1039/c6dt00210b] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spin-crossover Puzzle: SCO co-enantiomers, racemates, and co-racemates were successfully assembled via cocrystallization of four prefabricated enantiomeric iron(ii) modules 4R, 4S, 5R and 5S.
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Affiliation(s)
- Long-Fang Qin
- The Key Laboratory of Food Colloids and Biotechnology Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
- China
| | - Chun-Yan Pang
- The Key Laboratory of Food Colloids and Biotechnology Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
- China
| | - Wang-Kang Han
- The Key Laboratory of Food Colloids and Biotechnology Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
- China
| | - Feng-Li Zhang
- The Key Laboratory of Food Colloids and Biotechnology Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
- China
| | - Lei Tian
- The Key Laboratory of Food Colloids and Biotechnology Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
- China
| | - Zhi-Guo Gu
- The Key Laboratory of Food Colloids and Biotechnology Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
- China
| | - Xuehong Ren
- The Key Laboratory of Eco-textiles of Ministry of Education
- College of Textiles and Clothing
- Jiangnan University
- Wuxi 214122
- China
| | - Zaijun Li
- The Key Laboratory of Food Colloids and Biotechnology Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
- China
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34
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Bartual-Murgui C, Vela S, Roubeau O, Aromí G. Designed intramolecular blocking of the spin crossover of an Fe(ii) complex. Dalton Trans 2016; 45:14058-14062. [DOI: 10.1039/c6dt03047e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ligand intramolecular interactions trap an Fe(ii) complex in the high spin state, in a case of thermodynamic trapping rather than kinetic.
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Affiliation(s)
- C. Bartual-Murgui
- Departament de Química Inorgànica i Orgànica and IN2UB
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - S. Vela
- Laboratoire de Chimie Quantique
- Université de Strasbourg
- F-67000 Strasbourg
- France
| | - O. Roubeau
- Instituto de Ciencia de Materiales de Aragón (ICMA)
- CSIC and Universidad de Zaragoza
- 50009 Zaragoza
- Spain
| | - G. Aromí
- Departament de Química Inorgànica i Orgànica and IN2UB
- Universitat de Barcelona
- 08028 Barcelona
- Spain
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35
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Spin-Crossover Hysteresis of [FeII(LHiPr)2(NCS)2] (LHiPr = N-2-Pyridylmethylene-4-Isopropylaniline) Accompanied by Isopropyl Conformation Isomerism. MAGNETOCHEMISTRY 2015. [DOI: 10.3390/magnetochemistry1010017] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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36
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Gómez V, Sáenz de Pipaón C, Maldonado-Illescas P, Waerenborgh JC, Martin E, Benet-Buchholz J, Galán-Mascarós JR. Easy Excited-State Trapping and Record High TTIESST in a Spin-Crossover Polyanionic FeII Trimer. J Am Chem Soc 2015; 137:11924-7. [DOI: 10.1021/jacs.5b07879] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Verónica Gómez
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Paisos Catalans 16, E-43007 Tarragona, Spain
| | - Cristina Sáenz de Pipaón
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Paisos Catalans 16, E-43007 Tarragona, Spain
| | - Pilar Maldonado-Illescas
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Paisos Catalans 16, E-43007 Tarragona, Spain
| | - João Carlos Waerenborgh
- Centro
de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal
| | - Eddy Martin
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Paisos Catalans 16, E-43007 Tarragona, Spain
| | - Jordi Benet-Buchholz
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Paisos Catalans 16, E-43007 Tarragona, Spain
| | - José Ramón Galán-Mascarós
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Paisos Catalans 16, E-43007 Tarragona, Spain
- Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluis Companys, 23, E-08010 Barcelona, Spain
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37
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Spin state behavior of iron(II)/dipyrazolylpyridine complexes. New insights from crystallographic and solution measurements. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.08.006] [Citation(s) in RCA: 152] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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38
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Rat S, Sánchez Costa J, Bedoui S, Nicolazzi W, Molnár G, Salmon L, Bousseksou A. Investigation of nucleation and growth phenomena during the thermal and light induced spin transition in the [Fe(1-bpp)2][BF4]2 complex. PURE APPL CHEM 2015. [DOI: 10.1515/pac-2014-1002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractOptical microscopy measurements have been realized on single crystals of the [Fe(1-bpp)2][BF4]2 complex (1-bpp=2,6-di(pyrazol-1-yl)pyridine). The thermal spin transition around 253 K occurs by a heterogeneous nucleation and growth mechanism and involves a clear phase separation and a small hysteresis. This very abrupt and complete thermal transition is preceded by a premonitory spin conversion, which implies only a small fraction (ca. 2–3 %) of the molecules. This peculiar behavior may be the sign of heterophase fluctuations. The light-induced spin transition from the stable low spin (LS) to the metastable high spin (HS) phase was achieved at 80 K by focusing laser light into a small volume fraction of the crystal. Under continuous irradiation this photo-converted HS “nucleus” then grows and the whole crystal converts to the HS phase providing evidence for a light-induced instability in the system due to long-range elastic interactions. The relaxation of the light-induced metastable HS phase at 83 K follows a sigmoidal decay – typical of cooperative spin crossover systems. Nevertheless the spatial development of this relaxation process appears very homogeneous and no phase separation could be detected within the resolution of the optical microscope.
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Affiliation(s)
- Sylvain Rat
- 1Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse (UPS, INP), Toulouse, France
| | - José Sánchez Costa
- 1Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse (UPS, INP), Toulouse, France
| | - Salma Bedoui
- 2Micro-Optoelectronic and Nanostructure Laboratory, Faculty of Sciences, Monastir University, Environment Avenue, 5019 Monastir, Tunisia
| | - William Nicolazzi
- 1Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse (UPS, INP), Toulouse, France
| | - Gábor Molnár
- 1Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse (UPS, INP), Toulouse, France
| | - Lionel Salmon
- 1Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse (UPS, INP), Toulouse, France
| | - Azzedine Bousseksou
- 1Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse (UPS, INP), Toulouse, France
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Santoro A, Kershaw Cook LJ, Kulmaczewski R, Barrett SA, Cespedes O, Halcrow MA. Iron(II) complexes of tridentate indazolylpyridine ligands: enhanced spin-crossover hysteresis and ligand-based fluorescence. Inorg Chem 2015; 54:682-93. [PMID: 25563430 DOI: 10.1021/ic502726q] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reaction of 2,6-difluoropyridine with 2 equiv of indazole and NaH at room temperature affords a mixture of 2,6-bis(indazol-1-yl)pyridine (1-bip), 2-(indazol-1-yl)-6-(indazol-2-yl)pyridine (1,2-bip), and 2,6-bis(indazol-2-yl)pyridine (2-bip), which can be separated by solvent extraction. A two-step procedure using the same conditions also affords both 2-(indazol-1-yl)-6-(pyrazol-1-yl)pyridine (1-ipp) and 2-(indazol-2-yl)-6-(pyrazol-1-yl)pyridine (2-ipp). These are all annelated analogues of 2,6-di(pyrazol-1-yl)pyridine, an important ligand for spin-crossover complexes. Iron(II) complexes [Fe(1-bip)2](2+), [Fe(1,2-bip)2](2+), and [Fe(1-ipp)2](2+) are low-spin at room temperature, reflecting sterically imposed conformational rigidity of the 1-indazolyl ligands. In contrast, the 2-indazolyl complexes [Fe(2-bip)2](2+) and [Fe(2-ipp)2](2+) are high-spin in solution at room temperature, whereas salts of [Fe(2-bip)2](2+) exhibit thermal spin transitions in the solid state. Notably, [Fe(2-bip)2][BF4]2·2MeNO2 adopts a terpyridine embrace lattice structure and undergoes a spin transition near room temperature after annealing, resulting in thermal hysteresis that is wider than previously observed for this structure type (T1/2 = 266 K, ΔT = 16-20 K). This reflects enhanced mechanical coupling between the cations in the lattice through interdigitation of their ligand arms, which supports a previously proposed structure/function relationship for spin-crossover materials with this form of crystal packing. All of the compounds in this work exhibit blue fluorescence in solution under ambient conditions. In most cases, the ligand-based emission maxima are slightly red shifted upon complexation, but there is no detectable correlation between the emission maximum and the spin state of the iron centers.
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Affiliation(s)
- Amedeo Santoro
- School of Chemistry, University of Leeds , Woodhouse Lane, Leeds LS2 9JT, United Kingdom
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40
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Barrios LA, Salinas-Uber J, Roubeau O, Teat SJ, Aromí G. Molecular self-recognition: a chiral [Mn(ii)6] wheel via donor–acceptor π⋯π contacts and H-bonds. Chem Commun (Camb) 2015; 51:4631-4. [DOI: 10.1039/c5cc00142k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A multicomponent ligand binds three Mn(ii) centers into a cluster that exhibits self-recognition through a diverse array of complementary intermolecular interactions, that multiply in the solid state, and seem to persist in solution.
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Affiliation(s)
- L. A. Barrios
- Departament de Química Inorgànica
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - J. Salinas-Uber
- Departament de Química Inorgànica
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - O. Roubeau
- Instituto de Ciencia de Materiales de Aragón (ICMA)
- CSIC and Universidad de Zaragoza
- Zaragoza
- Spain
| | - S. J. Teat
- Advanced Light Source
- Berkeley Laboratory
- Berkeley
- USA
| | - G. Aromí
- Departament de Química Inorgànica
- Universitat de Barcelona
- 08028 Barcelona
- Spain
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Książek M, Kusz J, Białońska A, Bronisz R, Weselski M. Influence of conformational changes on spin crossover properties and superstructure formation in 2D coordination polymers [Fe(hbtz)2(RCN)2](ClO4)2. Dalton Trans 2015; 44:18563-75. [DOI: 10.1039/c5dt03249k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spin-crossover, governed by conformational changes of nitrile molecule, triggers corrugation of polymeric skeleton and formation of superstructure in [Fe(hbtz)2(allyl cyanide)2](ClO4)2.
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Affiliation(s)
- Maria Książek
- Institute of Physics
- University of Silesia
- PL-40-007 Katowice
- Poland
| | - Joachim Kusz
- Institute of Physics
- University of Silesia
- PL-40-007 Katowice
- Poland
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42
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Barrios LA, Peyrecave-Lleixà E, Craig GA, Roubeau O, Teat SJ, Aromí G. Unusual Crystal Packing in a Family of [Fe{2,6-bis(pyrazol-3-yl)pyridine}2]2+Compounds and the Effect on the Occurrence of Spin Crossover and Its Cooperative Character. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201403009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Craig GA, Costa JS, Roubeau O, Teat SJ, Shepherd HJ, Lopes M, Molnár G, Bousseksou A, Aromí G. High-temperature photo-induced switching and pressure-induced transition in a cooperative molecular spin-crossover material. Dalton Trans 2014; 43:729-37. [PMID: 24145502 DOI: 10.1039/c3dt52075g] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The thermal and photo-induced switching properties of the recently published molecular spin crossover complex [Fe(H4L)2](ClO4)2·H2O·2(CH3)2CO () have been investigated in detail through Raman spectroscopy. Magnetometric and single crystal X-ray diffraction kinetic studies within the hysteresis loop have proven its metastable character, which allowed establishing the shape of the true, quasi-static hysteresis loop. This is related to the proximity of the temperatures of the thermal high to low spin SCO (T1/2↓) to those of the relaxation of the thermally or photo-generated metastable states (T(TIESST) and T(LIESST), respectively). Green light irradiation within the hysteresis loop results in a complete low to high spin photo-switch. In addition, the SCO of at room temperature can be induced by applying pressure, as followed by Raman spectroscopy.
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Affiliation(s)
- Gavin A Craig
- Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain.
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44
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Craig GA, Roubeau O, Aromí G. Spin state switching in 2,6-bis(pyrazol-3-yl)pyridine (3-bpp) based Fe(II) complexes. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.02.002] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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45
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Costa JS, Rodríguez-Jiménez S, Craig GA, Barth B, Beavers CM, Teat SJ, Aromí G. Three-way crystal-to-crystal reversible transformation and controlled spin switching by a nonporous molecular material. J Am Chem Soc 2014; 136:3869-74. [PMID: 24555786 DOI: 10.1021/ja411595y] [Citation(s) in RCA: 162] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Porous materials capable of hosting external molecules are paramount in basic and applied research. Nonporous materials able to incorporate molecules via internal lattice reorganization are however extremely rare since their structural integrity usually does not resist the guest exchange processes. The novel heteroleptic low-spin Fe(II) complex [Fe(bpp)(H2L)](ClO4)2·1.5C3H6O (1; bpp = 2,6-bis(pyrazol-3-yl)pyridine, H2L = 2,6-bis(5-(2-methoxyphenyl)pyrazol-3-yl)pyridine) crystallizes as a compact discrete, nonporous material hosting solvate molecules of acetone. The system is able to extrude one-third of these molecules to lead to [Fe(bpp)(H2L)](ClO4)2·C3H6O (2), switching to the high-spin state while experiencing a profound crystallographic change. Compound 2 can be reversed to the original material upon reabsorption of acetone. Single crystal X-ray diffraction experiments on the latter system (1') and on 2 show that these are reversible single-crystal-to-single-crystal (SCSC) transformations. Likewise, complex 2 can replace acetone by MeOH and H2O to form [Fe(bpp)(H2L)](ClO4)2·1.25MeOH·0.5H2O (3) through a SCSC process that also implies a switch to the spin state. The 3→1 transformation through acetone reabsorption is also demonstrated. Besides the spin switching at room temperature, this series of SCSC transformations causes macroscopic changes in color that can be followed by the naked eye. The reversible exchanges of chemicals are therefore easily sensed at the temperature at which these occur, contrary to what is the case for most of the few existing nonporous spin-based sensors, which feature a large temperature gap between the process monitored and the mechanism of detection.
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Affiliation(s)
- José Sánchez Costa
- Departament de Química Inorgànica, Universitat de Barcelona , Diagonal, 645, 08028 Barcelona, Spain
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Kulmaczewski R, Olguín J, Kitchen JA, Feltham HLC, Jameson GNL, Tallon JL, Brooker S. Remarkable Scan Rate Dependence for a Highly Constrained Dinuclear Iron(II) Spin Crossover Complex with a Wide Thermal Hysteresis Loop. J Am Chem Soc 2014; 136:878-81. [DOI: 10.1021/ja411563x] [Citation(s) in RCA: 105] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Rafal Kulmaczewski
- Department
of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago,
P.O. Box 56, Dunedin 9054, New Zealand
| | - Juan Olguín
- Department
of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago,
P.O. Box 56, Dunedin 9054, New Zealand
| | - Jonathan A. Kitchen
- Department
of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago,
P.O. Box 56, Dunedin 9054, New Zealand
| | - Humphrey L. C. Feltham
- Department
of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago,
P.O. Box 56, Dunedin 9054, New Zealand
| | - Guy N. L. Jameson
- Department
of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago,
P.O. Box 56, Dunedin 9054, New Zealand
| | - Jeffery L. Tallon
- MacDiarmid
Institute for Advanced Materials and Nanotechnology and Robinson Research
Institute, Victoria University of Wellington, P.O. Box 31310, Lower Hutt, New Zealand
| | - Sally Brooker
- Department
of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago,
P.O. Box 56, Dunedin 9054, New Zealand
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Roberts TD, Little MA, Kershaw Cook LJ, Halcrow MA. Iron(ii) complexes of 2,6-di(1H-pyrazol-3-yl)-pyridine derivatives with hydrogen bonding and sterically bulky substituents. Dalton Trans 2014; 43:7577-88. [PMID: 24705977 DOI: 10.1039/c4dt00355a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Thomas D Roberts
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK.
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48
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Halcrow MA. Recent advances in the synthesis and applications of 2,6-dipyrazolylpyridine derivatives and their complexes. NEW J CHEM 2014. [DOI: 10.1039/c3nj00835e] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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49
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Tissot A, Fertey P, Guillot R, Briois V, Boillot M. Structural, Magnetic, and Vibrational Investigations of Fe
III
Spin‐Crossover Compounds [Fe(4‐MeO–SalEen)
2
]X with X = NO
3
–
and PF
6
–. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300960] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Antoine Tissot
- ICMMO‐ECI, UMR CNRS 8182, Université Paris‐Sud, 91405 Orsay, France, http://www.icmmo.u‐psud.fr/labos/LCI
| | - Pierre Fertey
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin, 91192 Gif sur Yvette, France
| | - Régis Guillot
- ICMMO‐ECI, UMR CNRS 8182, Université Paris‐Sud, 91405 Orsay, France, http://www.icmmo.u‐psud.fr/labos/LCI
| | - Valérie Briois
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin, 91192 Gif sur Yvette, France
| | - Marie‐Laure Boillot
- ICMMO‐ECI, UMR CNRS 8182, Université Paris‐Sud, 91405 Orsay, France, http://www.icmmo.u‐psud.fr/labos/LCI
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50
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Iron(II) complexes of 2,6-di(1-alkylpyrazol-3-yl)pyridine derivatives – The influence of distal substituents on the spin state of the iron centre. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.01.057] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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