1
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Halcrow MA. Mix and match - controlling the functionality of spin-crossover materials through solid solutions and molecular alloys. Dalton Trans 2024; 53:13694-13708. [PMID: 39119634 DOI: 10.1039/d4dt01855a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2024]
Abstract
The influence of dopant molecules on the structure and functionality of spin-crossover (SCO) materials is surveyed. Two aspects of the topic are well established. Firstly, isomorphous inert metal ion dopants in SCO lattices are a useful probe of the energetics of SCO processes. Secondly, molecular alloys of iron(II)/triazole coordination polymers containing mixtures of ligands were used to tune their spin-transitions towards room temperature. More recent examples of these and related materials are discussed that reveal new insights into these questions. Complexes which are not isomorphous can also be co-crystallised, either as solid solutions of the precursor molecules or as a random distribution of homo- and hetero-leptic centres in a molecular alloy. This could be a powerful method to manipulate SCO functionality. Published molecular alloys show different SCO behaviours, which may or may not include allosteric switching of their chemically distinct metal sites.
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Affiliation(s)
- Malcolm A Halcrow
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK.
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2
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Shahed H, Sharma N, Angst M, Voigt J, Perßon J, Prakash P, Törnroos KW, Chernyshov D, Gildenast H, Ohl M, Saffarini G, Grzechnik A, Friese K. Structural insight into the cooperativity of spin crossover compounds. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2023; 79:354-367. [PMID: 37578185 PMCID: PMC10552598 DOI: 10.1107/s2052520623005814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 07/02/2023] [Indexed: 08/15/2023]
Abstract
Spin-crossover (SCO) compounds are promising materials for a wide variety of industrial applications. However, the fundamental understanding of their nature of transition and its effect on the physical properties are still being fervently explored; the microscopic knowledge of their transition is essential for tailoring their properties. Here an attempt is made to correlate the changes in macroscopic physical properties with microscopic structural changes in the orthorhombic and monoclinic polymorphs of the SCO compound Fe(PM-Bia)2(NCS)2 (PM = N-2'-pyridylmethylene and Bia = 4-aminobiphenyl) by employing single-crystal X-ray diffraction, magnetization and DSC measurements. The dependence of macroscopic properties on cooperativity, highlighting the role of hydrogen bonding, π-π and van der Waals interactions is discussed. Values of entropy, enthalpy and cooperativity are calculated numerically based on the Slichter-Drickamer model. The particle size dependence of the magnetic properties is probed along with the thermal exchange and the kinetic behavior of the two polymorphs based on the dependence of magnetization on temperature scan rate and a theoretical model is proposed for the calculation of the non-equilibrium spin-phase fraction. Also a scan-rate-dependent two-step behavior observed for the orthorhombic polymorph, which is absent for the monoclinic polymorph, is reported. Moreover, it is found that the radiation dose from synchrotron radiation affects the spin-crossover process and shifts the transition region to lower temperatures, implying that the spin crossover can be tuned with radiation damage.
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Affiliation(s)
- H. Shahed
- Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institute (PGI-4), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
- Institute of Crystallography, RWTH Aachen University, Jägerstr. 17-19, 52066 Aachen, Germany
| | - N. Sharma
- Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institute (PGI-4), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - M. Angst
- Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institute (PGI-4), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - J. Voigt
- Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institute (PGI-4), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - J. Perßon
- Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institute (PGI-4), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - P. Prakash
- Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institute (PGI-4), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - K. W. Törnroos
- Department of Chemistry, University of Bergen, Allégaten 41, N-5007 Bergen, Norway
| | - D. Chernyshov
- Swiss–Norwegian Beamlines at the European Synchrotron Radiation Facility, 38000 Grenoble, France
| | - H. Gildenast
- Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany
| | - M. Ohl
- Jülich Centre for Neutron Science (JCNS-1), Forschungszentrum Jülich, 52425 Jülich, Germany
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - G. Saffarini
- Physics Department, An-Najah National University, Nablus, Palestine
| | - A. Grzechnik
- Institute of Crystallography, RWTH Aachen University, Jägerstr. 17-19, 52066 Aachen, Germany
- Jülich Centre for Neutron Science (JCNS-4), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - K. Friese
- Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institute (PGI-4), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
- Institute of Crystallography, RWTH Aachen University, Jägerstr. 17-19, 52066 Aachen, Germany
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3
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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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4
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Shen FX, Pi Q, Shi L, Shao D, Li HQ, Sun YC, Wang XY. Spin crossover in hydrogen-bonded frameworks of FeII complexes with organodisulfonate anions. Dalton Trans 2019; 48:8815-8825. [DOI: 10.1039/c9dt01326a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Four spin crossover FeII complexes of hydrogen-bonded frameworks were constructed from the charge-assisted hydrogen bonds between the FeII complexes and organodisulfonate anions.
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Affiliation(s)
- Fu-Xing Shen
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
| | - Qian Pi
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
| | - Le Shi
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
| | - Dong Shao
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
| | - Hong-Qing Li
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
| | - Yu-Chen Sun
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
| | - Xin-Yi Wang
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
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5
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Yang FL, Chen X, Wu WH, Zhang JH, Zhao XM, Shi YH, Shen F. Spin switching in tris(8-aminoquinoline)iron(ii)(BPh 4) 2: quantitative guest-losing dependent spin crossover properties and single-crystal-to-single-crystal transformation. Dalton Trans 2018; 48:231-241. [PMID: 30516211 DOI: 10.1039/c8dt03584a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
As a derivative of 2-picolylamine, which contains rich protons favouring hydrogen bond formation to assemble a variety of valuable spin crossover (SCO) compounds, 8-aminoquinoline (aqin) will be a good candidate for constructing new mononuclear bistable state compounds. With the guidance of this view, two solvated compounds [Fe(aqin)3](BPh4)2·2(CH3CN) (1·2CH3CN) and [Fe(aqin)3](BPh4)2·1.5(CH3COCH3) (2·1.5CH3COCH3) were synthesized. The structural characterization and magnetic studies demonstrate that this strategy has been successful. Single-crystal diffraction reveals that both the mononuclear compounds have facial (fac-)-configuration cations, which form hydrogen bonds using -NH2 groups with solvent molecules (acetonitrile or acetone). Subsequent magnetic measurement shows the highly sensitive solvent-dependent occurrence of a spin transition above room temperature for both compounds. Interestingly, for compound 1·2CH3CN, in the successively repeated heating and cooling process, by monitoring the loss of solvent molecules by TGA, the shifting of the spin transition curve is found to be linearly dependent on the fraction of the residual solvent content. Additionally, the desolvated sample can re-solvate with CH3CN and recover the magnetic response reproducibly. Furthermore, after losing the acetonitrile molecules, the single-crystal-to-single-crystal transformation occurred to give 1.
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Affiliation(s)
- Feng-Lei Yang
- School of Chemistry and Material Science and Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu 221116, P. R. China.
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6
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Svitlyk V, Chernyshov D, Mozharivskyj Y, Yuan F, Zaharko O, Mezouar M. Temperature- and Pressure-Induced Spin Crossover in Co1+xCr2-xSe4 (x = 0.24): A Diffraction Study. Inorg Chem 2016; 55:338-44. [PMID: 26670927 DOI: 10.1021/acs.inorgchem.5b02475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The Co(2+) ions of the Co1+xCr2-xSe4 phase (Co1.24Cr1.76Se4 composition with x = 0.24, C2/m space group, Cr3S4-type structure) undergo a high- to low-spin-state transition around 230 K, as concluded from the temperature-dependent single-crystal synchrotron radiation diffraction experiments and the previously reported physical property studies. The change of the spin state is not instantaneous and goes through a wide spin-crossover (SCO) region of 75 K. A similar Co(2+) high- to low-spin-state transition is suggested at a pressure of 14.5 GPa, as is evident from the pressure-dependent single-crystal synchrotron radiation diffraction experiments. The corresponding SCO region is equal to 5 GPa, and the structural behavior is different from the one observed during the temperature-dependent transition. Coupling between the spin-conversion process in Co1+xCr2-xSe4 and the concomitant changes in the physical properties opens a way for a controlled tuning of the observed physical response through compositional and structural modifications.
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Affiliation(s)
- V Svitlyk
- ID27 High Pressure Beamline, ESRF, CS40220 , F-38043 Grenoble, France
| | - D Chernyshov
- Swiss-Norwegian Beamlines, ESRF, CS40220 , F-38043 Grenoble, France
| | - Y Mozharivskyj
- Department of Chemistry and Chemical Biology, McMaster University , Hamilton, Ontario L8S 4M1, Canada
| | - F Yuan
- Department of Chemistry and Chemical Biology, McMaster University , Hamilton, Ontario L8S 4M1, Canada
| | - O Zaharko
- Laboratory for Neutron Scattering, Paul Scherrer Institute , 5232 Villigen, Switzerland
| | - M Mezouar
- ID27 High Pressure Beamline, ESRF, CS40220 , F-38043 Grenoble, France
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7
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Cook LJK, Kulmaczewski R, Cespedes O, Halcrow MA. Different Spin-State Behaviors in Isostructural Solvates of a Molecular Iron(II) Complex. Chemistry 2015; 22:1789-99. [DOI: 10.1002/chem.201503989] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Indexed: 11/07/2022]
Affiliation(s)
- Laurence J. Kershaw Cook
- School of Chemistry; University of Leeds; Woodhouse Lane Leeds LS2 9JT UK), Fax
- Department of Chemistry; University of Bath; Claverton Down Bath BA2 7AY UK)
| | - Rafal Kulmaczewski
- School of Chemistry; University of Leeds; Woodhouse Lane Leeds LS2 9JT UK), Fax
| | - Oscar Cespedes
- School of Physics and Astronomy; University of Leeds; E.C. Stoner Building Leeds LS2 9JT UK)
| | - Malcolm A. Halcrow
- School of Chemistry; University of Leeds; Woodhouse Lane Leeds LS2 9JT UK), Fax
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8
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Alvarez S. Distortion Pathways of Transition Metal Coordination Polyhedra Induced by Chelating Topology. Chem Rev 2015; 115:13447-83. [PMID: 26575868 DOI: 10.1021/acs.chemrev.5b00537] [Citation(s) in RCA: 127] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A continuous shape measures analysis of the coordination polyhedra of a host of transition metal complexes with bi- and multidentate ligands discloses the distortion pathway associated with each particular topology of the chelate rings formed. The basic parameter that controls the degree of distortion is the metal-donor atom bond distance that induces nonideal bond angles due to the rigidity of the ligands. Thus, the degree of distortion within each family of complexes depends on the atomic size, on which the high- or low-spin state has a large effect. Special attention is therefore paid to several spin-crossover systems and to the enhanced distortions that go along with the transition from low- to high-spin state affected by temperature, light, or pressure. Several families of complexes show deviations from the expected distortion pathways in the high-spin state that can be associated to the onset of intermolecular interactions such as secondary coordination of counterions or solvent molecules. Also, significant displacement of counterions in an extended solid may result from the changes in metal-ligand bond distances when ligands are involved in intermolecular hydrogen bonding.
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Affiliation(s)
- Santiago Alvarez
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona , Martí i Franquès 1-11, 08028 Barcelona, Spain
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9
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Zhao XH, Zhang SL, Shao D, Wang XY. Spin Crossover in [Fe(2-Picolylamine)3]2+ Adjusted by Organosulfonate Anions. Inorg Chem 2015. [DOI: 10.1021/acs.inorgchem.5b00870] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xin-Hua Zhao
- State Key Laboratory of Coordination Chemistry, Collaborative
Innovation Center of Advanced Microstructures, School of Chemistry
and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Shao-Liang Zhang
- State Key Laboratory of Coordination Chemistry, Collaborative
Innovation Center of Advanced Microstructures, School of Chemistry
and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Dong Shao
- State Key Laboratory of Coordination Chemistry, Collaborative
Innovation Center of Advanced Microstructures, School of Chemistry
and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Xin-Yi Wang
- State Key Laboratory of Coordination Chemistry, Collaborative
Innovation Center of Advanced Microstructures, School of Chemistry
and Chemical Engineering, Nanjing University, Nanjing 210093, China
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10
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Zhang SL, Zhao XH, Wang YM, Shao D, Wang XY. Spin crossover behaviour in one-dimensional FeIIcompounds based on the [M(CN)4]2−(M = Pd, Pt) units. Dalton Trans 2015; 44:9682-90. [DOI: 10.1039/c5dt00836k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Four one-dimensional heterobimetallic spin crossover coordination polymers {Fe(L)2[M(CN)4]}n(M = PdIIand PtII) have been synthesized and characterized.
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Affiliation(s)
- Shao-Liang Zhang
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Centre of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing, China
| | - Xin-Hua Zhao
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Centre of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing, China
| | - Yuan-Min Wang
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Centre of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing, China
| | - Dong Shao
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Centre of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing, China
| | - Xin-Yi Wang
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Centre of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing, China
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11
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Langer R, Bönisch F, Maser L, Pietzonka C, Vondung L, Zimmermann TP. Substitutional Lability of Diphosphine Ligands in Tetrahedral Iron(II) Chloro Complexes. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402859] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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12
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Li JY, Chen YC, Zhang ZM, Liu W, Ni ZP, Tong ML. Tuning the Spin-Crossover Behaviour of a Hydrogen-Accepting Porous Coordination Polymer by Hydrogen-Donating Guests. Chemistry 2014; 21:1645-51. [DOI: 10.1002/chem.201405060] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2014] [Indexed: 11/08/2022]
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13
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Chakraborty P, Enachescu C, Humair A, Egger L, Delgado T, Tissot A, Guénée L, Besnard C, Bronisz R, Hauser A. Light-induced spin-state switching in the mixed crystal series of the 2D coordination network {[Zn1−xFex(bbtr)3](BF4)2}∞: optical spectroscopy and cooperative effects. Dalton Trans 2014; 43:17786-96. [DOI: 10.1039/c4dt01728e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Strong cooperative interactions result in light-induced bistability between the high-spin and the low-spin state.
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Affiliation(s)
- Pradip Chakraborty
- Département de Chimie Physique
- Université de Genève
- 1211 Genève, Switzerland
| | | | - Arnaud Humair
- Département de Chimie Physique
- Université de Genève
- 1211 Genève, Switzerland
| | - Leo Egger
- Département de Chimie Physique
- Université de Genève
- 1211 Genève, Switzerland
| | - Teresa Delgado
- Département de Chimie Physique
- Université de Genève
- 1211 Genève, Switzerland
| | - Antoine Tissot
- Département de Chimie Physique
- Université de Genève
- 1211 Genève, Switzerland
| | - Laure Guénée
- Laboratoire de Crystallographie
- Université de Genève
- 1211 Genève, Switzerland
| | - Céline Besnard
- Laboratoire de Crystallographie
- Université de Genève
- 1211 Genève, Switzerland
| | - Robert Bronisz
- Faculty of Chemistry
- University of Wroclaw
- 50-383 Wroclaw, Poland
| | - Andreas Hauser
- Département de Chimie Physique
- Université de Genève
- 1211 Genève, Switzerland
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14
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Chakraborty P, Pillet S, Bendeif EE, Enachescu C, Bronisz R, Hauser A. Light-Induced Bistability in the 2 D Coordination Network {[Fe(bbtr)3][BF4]2}∞: Wavelength-Selective Addressing of Molecular Spin States. Chemistry 2013; 19:11418-28. [DOI: 10.1002/chem.201301257] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Indexed: 11/10/2022]
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15
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Seredyuk M, Muñoz MC, Castro M, Romero-Morcillo T, Gaspar AB, Real JA. Unprecedented Multi-Stable Spin Crossover Molecular Material with Two Thermal Memory Channels. Chemistry 2013; 19:6591-6. [DOI: 10.1002/chem.201300394] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Indexed: 11/10/2022]
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16
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Ross TM, Moubaraki B, Batten SR, Murray KS. Spin crossover in polymeric and heterometallic FeII species containing polytopic dipyridylamino-substituted-triazine ligands. Dalton Trans 2012; 41:2571-81. [PMID: 21858315 DOI: 10.1039/c1dt10818b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the synthesis and characterisation of the new polytopic ligands, ddta (N,N-di(pyridin-2-yl)-4,6-di(1,4,7,10-tetraoxa-13-azacyclopentadecan-13-yl)-1,3,5-triazin-2-amine) and tptd (N(2),N(2),N(4),N(4)-tetra(pyridin-2-yl)-6-(1,4,7,10-tetraoxa-13-azacyclopentadecan-13-yl)-1,3,5-triazine-2,4-diamine). Each contains N-donor dipyridylamino binding sites as well as separate and distinct mono-aza-15-crown-5 binding sites. The ligand ddta has been used to synthesise the polymeric heterometallic SCO compound trans-[Fe(II)(NCS)(2)(ddta)(2)Na(2)](ClO(4))(2)·4CH(3)CH(2)CH(2)OH, 1, and tptd has been used to synthesise the polymeric SCO compound trans-[Fe(II)(NCS)(2)(tptd)]·CH(3)OH, 2, and the dinuclear compound cis-[(Fe(II))(2)(NCS)(4)(tptd)(2)], 3. Magnetic susceptibility measurements show that 1 and a desolvated sample of 2 each undergo a gradual, one-step spin transition with T(½) values of ~240 K and ~110 K, respectively. The paucity of inter-chain intermolecular interactions, as well as the flexible, covalent bridges between Fe(II) spin crossover sites, are likely to contribute to the gradual nature of the spin transition observed in each case. Variable temperature powder X-ray diffraction studies on 1 show the anisotropic behaviour of the unit cell parameters, where c and the b-c plane are most affected by structural changes occurring as the temperature is lowered.
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Affiliation(s)
- Tamsyn M Ross
- School of Chemistry, Monash University, Clayton, Victoria, Australia
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17
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Ross TM, Moubaraki B, Neville SM, Batten SR, Murray KS. Polymorphism and spin crossover in mononuclear FeIIspecies containing new dipyridylamino-substituted s-triazine ligands. Dalton Trans 2012; 41:1512-23. [DOI: 10.1039/c1dt11597a] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Halcrow MA. Structure:function relationships in molecular spin-crossover complexes. Chem Soc Rev 2011; 40:4119-42. [PMID: 21483934 DOI: 10.1039/c1cs15046d] [Citation(s) in RCA: 642] [Impact Index Per Article: 49.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spin-crossover compounds are becoming increasingly popular for device and sensor applications, and in soft materials, that make use of their switchable colour, paramagnetism and conductivity. The de novo design of new solid spin-crossover compounds with pre-defined switching properties is desirable for application purposes. This challenging problem of crystal engineering requires an understanding of how the temperature and cooperativity of a spin-transition are influenced by the structure of the bulk material. Towards that end, this critical review presents a survey of molecular spin-crossover compounds with good availability of crystallographic data. A picture is emerging that changes in molecular shape between the high- and low-spin states, and the ability of a lattice to accommodate such changes, can play an important role in determining the existence and the cooperativity of a thermal spin-transition in the solid state (198 references).
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Affiliation(s)
- Malcolm A Halcrow
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT. m.a.halcrow@ leeds.ac.uk
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Ross TM, Moubaraki B, Wallwork KS, Batten SR, Murray KS. A temperature-dependent order-disorder and crystallographic phase transition in a 0D Feii spin crossover compound and its non-spin crossover Coii isomorph. Dalton Trans 2011; 40:10147-55. [DOI: 10.1039/c1dt10961h] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ni Z, Shores MP. Supramolecular Effects on Anion-Dependent Spin-State Switching Properties in Heteroleptic Iron(II) Complexes. Inorg Chem 2010; 49:10727-35. [DOI: 10.1021/ic102004c] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhaoping Ni
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
| | - Matthew P. Shores
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
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