1
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Zhang Y, Torres-Cavanillas R, Yan X, Zeng Y, Jiang M, Clemente-León M, Coronado E, Shi S. Spin crossover iron complexes with spin transition near room temperature based on nitrogen ligands containing aromatic rings: from molecular design to functional devices. Chem Soc Rev 2024; 53:8764-8789. [PMID: 39072682 DOI: 10.1039/d3cs00688c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2024]
Abstract
During last decades, significant advances have been made in iron-based spin crossover (SCO) complexes, with a particular emphasis on achieving reversible and reproducible thermal hysteresis at room temperature (RT). This pursuit represents a pivotal goal within the field of molecular magnetism, aiming to create molecular devices capable of operating in ambient conditions. Here, we summarize the recent progress of iron complexes with spin transition near RT based on nitrogen ligands containing aromatic rings from molecular design to functional devices. Specifically, we discuss the various factors, including supramolecular interactions, crystal packing, guest molecules and pressure effects, that could influence its cooperativity and the spin transition temperature. Furthermore, the most recent advances in their implementation as mechanical actuators, switching/memories, sensors, and other devices, have been introduced as well. Finally, we give a perspective on current challenges and future directions in SCO community.
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Affiliation(s)
- Yongjie Zhang
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
| | - Ramón Torres-Cavanillas
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Catedrático José Beltrán 2, 46980 Paterna, Spain.
| | - Xinxin Yan
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
| | - Yixun Zeng
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
| | - Mengyun Jiang
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
| | - Miguel Clemente-León
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Catedrático José Beltrán 2, 46980 Paterna, Spain.
| | - Eugenio Coronado
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Catedrático José Beltrán 2, 46980 Paterna, Spain.
| | - Shengwei Shi
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
- Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), Jianghan University, Wuhan, 430056, China
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2
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Kamel SM, Daróczi L, Tóth LZ, Beke DL, Juárez GG, Cobo S, Salmon L, Molnár G, Bousseksou A. Acoustic emissions from spin crossover complexes. JOURNAL OF MATERIALS CHEMISTRY. C 2024; 12:5757-5765. [PMID: 38680543 PMCID: PMC11044199 DOI: 10.1039/d4tc00495g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Accepted: 03/19/2024] [Indexed: 05/01/2024]
Abstract
Acoustic emission from the compounds [Fe(HB(tz)3)2] and [Fe(Htrz)(trz)2]BF4 was detected during the thermally induced spin transition and is correlated with simultaneously recorded calorimetric signals. We ascribe this phenomenon to elastic waves produced by microstructural and volume changes accompanying the spin transition. Despite the perfect reversibility of the spin state switching (seen by the calorimeter), the acoustic emission activity decreases for successive thermal cycles, revealing thus irreversible microstructural evolution of the samples. The acoustic emission signal amplitude and energy probability distribution functions followed power-law behavior and the characteristic exponents were found to be similar for the two samples both on heating and cooling, indicating the universal character, which is further substantiated by the well scaled average temporal shapes of the avalanches.
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Affiliation(s)
- Sarah M Kamel
- Department of Solid State Physics, Doctoral School of Physics, University of Debrecen P.O. Box 2 H-4010 Debrecen Hungary
- Physics Department, Faculty of Science Ain Shams University, Abbassia 11566 Cairo Egypt
| | - Lajos Daróczi
- Department of Solid State Physics, Doctoral School of Physics, University of Debrecen P.O. Box 2 H-4010 Debrecen Hungary
| | - László Z Tóth
- Department of Solid State Physics, Doctoral School of Physics, University of Debrecen P.O. Box 2 H-4010 Debrecen Hungary
| | - Dezső L Beke
- Department of Solid State Physics, Doctoral School of Physics, University of Debrecen P.O. Box 2 H-4010 Debrecen Hungary
| | - Gerardo Gutiérrez Juárez
- Departamento de Ingeniería Física, División de Ciencias e Ingenierías, Universidad de Guanajuato-Campus León, Loma del Bosque 103, Loma del Campestre 37150 León Gto. Mexico
| | - Saioa Cobo
- LCC, CNRS & University of Toulouse, 205 route de Narbonne 31077 Toulouse France
| | - Lionel Salmon
- LCC, CNRS & University of Toulouse, 205 route de Narbonne 31077 Toulouse France
| | - Gábor Molnár
- LCC, CNRS & University of Toulouse, 205 route de Narbonne 31077 Toulouse France
| | - Azzedine Bousseksou
- LCC, CNRS & University of Toulouse, 205 route de Narbonne 31077 Toulouse France
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3
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Gavara-Edo M, Valverde-Muñoz FJ, Muñoz MC, Elidrissi Moubtassim S, Marques-Moros F, Herrero-Martín J, Znovjyak K, Seredyuk M, Real JA, Coronado E. Design and Processing as Ultrathin Films of a Sublimable Iron(II) Spin Crossover Material Exhibiting Efficient and Fast Light-Induced Spin Transition. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2023; 35:9591-9602. [PMID: 38047182 PMCID: PMC10687866 DOI: 10.1021/acs.chemmater.3c01704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 10/17/2023] [Accepted: 10/18/2023] [Indexed: 12/05/2023]
Abstract
Materials based on spin crossover (SCO) molecules have centered the attention in molecular magnetism for more than 40 years as they provide unique examples of multifunctional and stimuli-responsive materials, which can be then integrated into electronic devices to exploit their molecular bistability. This process often requires the preparation of thermally stable SCO molecules that can sublime and remain intact in contact with surfaces. However, the number of robust sublimable SCO molecules is still very scarce. Here, we report a novel example of this kind. It is based on a neutral iron(II) coordination complex formulated as [Fe(neoim)2], where neoimH is the ionogenic ligand 2-(1H-imidazol-2-yl)-9-methyl-1,10-phenanthroline. In the first part, a comprehensive study, which covers the synthesis and magnetostructural characterization of the [Fe(neoim)2] complex as a bulk microcrystalline material, is reported. Then, in the second part, we investigate the suitability of this material to form thin films through high-vacuum sublimation. Finally, the retainment of all present SCO capabilities in the bulk when the material is processed is thoroughly studied by means of X-ray absorption spectroscopy. In particular, a very efficient and fast light-induced spin transition (LIESST effect) has been observed, even for ultrathin films of 15 nm.
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Affiliation(s)
- Miguel Gavara-Edo
- Instituto
de Ciencia Molecular, Universidad de Valencia, Catedrático José Beltrán
2, Paterna 46980, Spain
| | | | - M. Carmen Muñoz
- Departamento
de Fisica Aplicada, Universitat Politècnica
de València, Camino de Vera s/n, Valencia 46022, Spain
| | - Safaa Elidrissi Moubtassim
- Instituto
de Ciencia Molecular, Universidad de Valencia, Catedrático José Beltrán
2, Paterna 46980, Spain
| | - Francisco Marques-Moros
- Instituto
de Ciencia Molecular, Universidad de Valencia, Catedrático José Beltrán
2, Paterna 46980, Spain
| | | | - Kateryna Znovjyak
- Department
of Chemistry, Taras Shevchenko National
University of Kyiv, 64/13,
Volodymyrska Street, Kyiv 01601, Ukraine
| | - Maksym Seredyuk
- Instituto
de Ciencia Molecular, Universidad de Valencia, Catedrático José Beltrán
2, Paterna 46980, Spain
- Department
of Chemistry, Taras Shevchenko National
University of Kyiv, 64/13,
Volodymyrska Street, Kyiv 01601, Ukraine
| | - José Antonio Real
- Instituto
de Ciencia Molecular, Universidad de Valencia, Catedrático José Beltrán
2, Paterna 46980, Spain
| | - Eugenio Coronado
- Instituto
de Ciencia Molecular, Universidad de Valencia, Catedrático José Beltrán
2, Paterna 46980, Spain
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4
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Radoń M. Benchmarks for transition metal spin-state energetics: why and how to employ experimental reference data? Phys Chem Chem Phys 2023; 25:30800-30820. [PMID: 37938035 DOI: 10.1039/d3cp03537a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
Accurate prediction of energy differences between alternative spin states of transition metal complexes is essential in computational (bio)inorganic chemistry-for example, in characterization of spin crossover materials and in the theoretical modeling of open-shell reaction mechanisms-but it remains one of the most compelling problems for quantum chemistry methods. A part of this challenge is to obtain reliable reference data for benchmark studies, as even the highest-level applicable methods are known to give divergent results. This Perspective discusses two possible approaches to method benchmarking for spin-state energetics: using either theoretically computed or experiment-derived reference data. With the focus on the latter approach, an extensive general review is provided for the available experimental data of spin-state energetics and their interpretations in the context of benchmark studies, targeting the possibility of back-correcting the vibrational effects and the influence of solvents or crystalline environments. With a growing amount of experience, these effects can be now not only qualitatively understood, but also quantitatively modeled, providing the way to derive nearly chemically accurate estimates of the electronic spin-state gaps to be used as benchmarks and advancing our understanding of the phenomena related to spin states in condensed phases.
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Affiliation(s)
- Mariusz Radoń
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Krakow, Poland.
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5
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Zhang L, Ridier K, Horniichuk OY, Calvez S, Salmon L, Molnár G, Bousseksou A. Reversible Switching of Strong Light-Matter Coupling Using Spin-Crossover Molecular Materials. J Phys Chem Lett 2023:6840-6849. [PMID: 37487224 DOI: 10.1021/acs.jpclett.3c01136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/26/2023]
Abstract
The formation of hybrid light-matter states through the resonant interaction of confined electromagnetic fields with matter excitations has emerged as a fascinating tool for controlling quantum-mechanical states and then manipulating the functionalities and chemical reactivity landscape of molecular materials. Here we report the first observation of switchable strong light-matter coupling involving bistable spin-crossover molecules. Spectroscopic measurements, supported by transfer-matrix and coupled-oscillator simulations, reveal Rabi splitting values of up to 550 meV, which at 15% of the molecular excitation energy enter the regime of ultrastrong coupling. We find that the thermally induced switching of molecules between their low-spin and high-spin states allows fine control of the light-matter hybridization strength, offering the appealing possibility of reversible switching between the ultrastrong- and weak-coupling regimes within a single photonic structure. Through this work, we show that spin-crossover molecular compounds constitute a promising class of active nanomaterials in the burgeoning context of tunable polaritonic devices and polaritonic chemistry.
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Affiliation(s)
- Lijun Zhang
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, Université de Toulouse 205 route de Narbonne, F-31077 Toulouse, France
| | - Karl Ridier
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, Université de Toulouse 205 route de Narbonne, F-31077 Toulouse, France
| | - Oleksandr Ye Horniichuk
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, Université de Toulouse 205 route de Narbonne, F-31077 Toulouse, France
| | - Stéphane Calvez
- Laboratoire d'Analyse et d'Architecture des Systèmes, CNRS UPR 8001, Université de Toulouse 7 avenue du colonel Roche, F-31400 Toulouse, France
| | - Lionel Salmon
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, Université de Toulouse 205 route de Narbonne, F-31077 Toulouse, France
| | - Gábor Molnár
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, Université de Toulouse 205 route de Narbonne, F-31077 Toulouse, France
| | - Azzedine Bousseksou
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, Université de Toulouse 205 route de Narbonne, F-31077 Toulouse, France
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6
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Review of Fe-based spin crossover metal complexes in multiscale device architectures. Inorganica Chim Acta 2023. [DOI: 10.1016/j.ica.2022.121168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Seo J, Braun JD, Dev VM, Mason JA. Driving Barocaloric Effects in a Molecular Spin-Crossover Complex at Low Pressures. J Am Chem Soc 2022; 144:6493-6503. [PMID: 35360899 DOI: 10.1021/jacs.2c01315] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Barocaloric effects─thermal changes in a material induced by applied hydrostatic pressure─offer promise for creating solid-state refrigerants as alternatives to conventional volatile refrigerants. To enable efficient and scalable barocaloric cooling, materials that undergo high-entropy, reversible phase transitions in the solid state in response to a small change in pressure are needed. Here, we report that pressure-induced spin-crossover (SCO) transitions in the molecular iron(II) complex Fe[HB(tz)3]2 (HB(tz)3- = bis[hydrotris(1,2,4-triazol-1-yl)borate]) drive giant and reversible barocaloric effects at easily accessible pressures. Specifically, high-pressure calorimetry and powder X-ray diffraction studies reveal that pressure shifts as low as 10 bar reversibly induce nonzero isothermal entropy changes, and a pressure shift of 150 bar reversibly induces a large isothermal entropy change (>90 J kg-1 K-1) and adiabatic temperature change (>2 K). Moreover, we demonstrate that the thermodynamics of the SCO transition can be fine-tuned through systematic deuteration of the tris(triazolyl)borate ligand. These results provide new insights into pressure-induced SCO transitions and further establish SCO materials as promising barocaloric materials.
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Affiliation(s)
- Jinyoung Seo
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Jason D Braun
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Vidhya M Dev
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Jarad A Mason
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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8
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Shylin SI, Shova S, Shepherd HJ, Ksenofontov V, Tremel W, Gural'skiy IA. 1D iron(II)-1,2,4-triazolic chains with spin crossover assembled from discrete trinuclear complexes. Dalton Trans 2022; 51:2364-2369. [PMID: 35043827 DOI: 10.1039/d2dt00004k] [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
We report on a molecular cationic iron(II) complex with a 4-amino-1,2,4-triazole ligand and a tetraiodomercurate anion exhibiting an incomplete spin crossover (SCO). The complex exhibits an unusual disordered structure with a linear arrangement of ligand and water molecules that can potentially accommodate up to four iron atoms, but both terminal metal positions have half chemical occupancies, while occupancies of all ligands are full. This corresponds to the crystallisation of disordered trinuclear complexes arranged into 1D supramolecular chains. Iron cations have different N6 or N3O3 coordination environments, leading to the thermally induced SCO in two thirds of the metal centres. This SCO behaviour was characterised by magnetic susceptibility measurements and Mössbauer spectroscopy.
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Affiliation(s)
- Sergii I Shylin
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska 64, 01601 Kyiv, Ukraine. .,Department of Chemistry - Ångström Laboratory, Uppsala University, PO Box 523, 75120 Uppsala, Sweden
| | - Sergiu Shova
- Petru Poni Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Helena J Shepherd
- Supramolecular, Interfacial & Synthetic Chemistry Group, School of Physical Sciences, University of Kent, Canterbury CT2 7NH, UK
| | - Vadim Ksenofontov
- Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg University of Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Wolfgang Tremel
- Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg University of Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Il'ya A Gural'skiy
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska 64, 01601 Kyiv, Ukraine.
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9
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Ridier K, Nicolazzi W, Salmon L, Molnár G, Bousseksou A. Sequential Activation of Molecular and Macroscopic Spin-State Switching within the Hysteretic Region Following Pulsed Light Excitation. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2105468. [PMID: 34817094 DOI: 10.1002/adma.202105468] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 11/19/2021] [Indexed: 06/13/2023]
Abstract
Molecular spin-crossover (SCO) compounds constitute a promising class of photoactive materials exhibiting efficient photoinduced phase transitions (PIPTs). Taking advantage of the unique, picture-perfect reproducibility of the spin-transition properties in the compound [Fe(HB(1,2,4-triazol-1-yl)3 )2 ], the spatiotemporal dynamics of the PIPT within the thermodynamic metastability (hysteretic) region of a single crystal is dissected, using pump-probe optical microscopy. Beyond a threshold laser-excitation density, complete PIPTs are evidenced, with conversion rates up to 200 switched molecules per absorbed photon. It is shown that the PIPT takes place through the sequential activation of two (molecular and macroscopic) switching mechanisms, occurring on sub-microsecond and millisecond timescales, governed by the intramolecular and free energy barriers of the system, respectively. The main finding here is that the thermodynamic metastability has strictly no influence on the sub-millisecond switching dynamics. Indeed, before this millisecond timescale, the response of the crystal to the laser excitation involves a gradual, molecular conversion process, as if there were no hysteresis loop. Consequently, in this regime, even a 100% photoinduced conversion may not give rise to a PIPT. These results provide new insight on the intrinsic dynamical limits of the PIPT, which is an important issue from a technological perspective.
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Affiliation(s)
- Karl Ridier
- Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse, Toulouse, 31077, France
| | - William Nicolazzi
- Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse, Toulouse, 31077, France
| | - Lionel Salmon
- Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse, Toulouse, 31077, France
| | - Gábor Molnár
- Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse, Toulouse, 31077, France
| | - Azzedine Bousseksou
- Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse, Toulouse, 31077, France
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10
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Horniichuk OY, Ridier K, Molnár G, Kotsyubynsky VO, Shova S, Amirkhanov VM, Gural'skiy IA, Salmon L, Bousseksou A. Solvatomorphism, polymorphism and spin crossover in bis[hydrotris(1,2,3-triazol-1-yl)borate]iron( ii). NEW J CHEM 2022. [DOI: 10.1039/d2nj01471h] [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
We describe a detailed characterization of the spin crossover bis[hydrotris(1,2,3-triazol-1-yl)borate]iron(ii) complex ([Fe(HB(1,2,3-tz)3)2]) and solvatomorphs obtained by recrystallisation or single crystal to single crystal transformation.
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Affiliation(s)
- Oleksandr Ye. Horniichuk
- Taras Shevchenko National University of Kyiv, Department of Chemistry, 64 Volodymyrska St., 01601 Kyiv, Ukraine
- LCC, CNRS and Université de Toulouse (UPS, INP), 205 route de Narbonne, F-31077 Toulouse, France
| | - Karl Ridier
- LCC, CNRS and Université de Toulouse (UPS, INP), 205 route de Narbonne, F-31077 Toulouse, France
| | - Gábor Molnár
- LCC, CNRS and Université de Toulouse (UPS, INP), 205 route de Narbonne, F-31077 Toulouse, France
| | - Volodymyr O. Kotsyubynsky
- Department of Material Science and New Technology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk 76018, Ukraine
| | - Sergiu Shova
- “Petru Poni” Institute of Macromolecular Chemistry, 41A Aleea Gr. Ghica Voda, 700487 Iasi, Romania
| | - Vladimir M. Amirkhanov
- Taras Shevchenko National University of Kyiv, Department of Chemistry, 64 Volodymyrska St., 01601 Kyiv, Ukraine
| | - Il’ya A. Gural'skiy
- Taras Shevchenko National University of Kyiv, Department of Chemistry, 64 Volodymyrska St., 01601 Kyiv, Ukraine
| | - Lionel Salmon
- LCC, CNRS and Université de Toulouse (UPS, INP), 205 route de Narbonne, F-31077 Toulouse, France
| | - Azzedine Bousseksou
- LCC, CNRS and Université de Toulouse (UPS, INP), 205 route de Narbonne, F-31077 Toulouse, France
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11
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Kumar KS, Ruben M. Sublimable Spin-Crossover Complexes: From Spin-State Switching to Molecular Devices. Angew Chem Int Ed Engl 2021; 60:7502-7521. [PMID: 31769131 PMCID: PMC8048919 DOI: 10.1002/anie.201911256] [Citation(s) in RCA: 122] [Impact Index Per Article: 40.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Indexed: 11/10/2022]
Abstract
Spin-crossover (SCO) active transition metal complexes are an important class of switchable molecular materials due to their bistable spin-state switching characteristics at or around room temperature. Vacuum-sublimable SCO complexes are a subclass of SCO complexes suitable for fabricating ultraclean spin-switchable films desirable for applications, especially in molecular electronics/spintronics. Consequently, on-surface SCO of thin-films of sublimable SCO complexes have been studied employing spectroscopy and microscopy techniques, and results of fundamental and technological importance have been obtained. This Review provides complete coverage of advances made in the field of vacuum-sublimable SCO complexes: progress made in the design and synthesis of sublimable functional SCO complexes, on-surface SCO of molecular and multilayer thick films, and various molecular and thin-film device architectures based on the sublimable SCO complexes.
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Affiliation(s)
- Kuppusamy Senthil Kumar
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS)CNRS-Université de Strasbourg23, rue du Loess, BP 4367034Strasbourg cedex 2France
| | - Mario Ruben
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS)CNRS-Université de Strasbourg23, rue du Loess, BP 4367034Strasbourg cedex 2France
- Institute of NanotechnologyKarlsruhe Institute of Technology (KIT)Hermann-von-Helmholtz-Platz 176344Eggenstein-LeopoldshafenGermany
- Institute of Quantum Materials and -TechnologyKarlsruhe Institute of Technology (KIT)Hermann-von-Helmholtz-Platz 176344Eggenstein-LeopoldshafenGermany
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12
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Nonvolatile Voltage Controlled Molecular Spin-State Switching for Memory Applications. MAGNETOCHEMISTRY 2021. [DOI: 10.3390/magnetochemistry7030037] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Nonvolatile, molecular multiferroic devices have now been demonstrated, but it is worth giving some consideration to the issue of whether such devices could be a competitive alternative for solid-state nonvolatile memory. For the Fe (II) spin crossover complex [Fe{H2B(pz)2}2(bipy)], where pz = tris(pyrazol-1-yl)-borohydride and bipy = 2,2′-bipyridine, voltage-controlled isothermal changes in the electronic structure and spin state have been demonstrated and are accompanied by changes in conductance. Higher conductance is seen with [Fe{H2B(pz)2}2(bipy)] in the high spin state, while lower conductance occurs for the low spin state. Plausibly, there is the potential here for low-cost molecular solid-state memory because the essential molecular thin films are easily fabricated. However, successful device fabrication does not mean a device that has a practical value. Here, we discuss the progress and challenges yet facing the fabrication of molecular multiferroic devices, which could be considered competitive to silicon.
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13
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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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14
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Mahesha, Pampa KJ, Karthik CS, Hema MK, Mallu P, Lokanath NK. Post-synthetic modification of supramolecular assemblies of β-diketonato Cu( ii) complexes: comparing and contrasting the molecular topology by crystal structure and quantum computational studies. CrystEngComm 2021. [DOI: 10.1039/d1ce00304f] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Solvent-induced structural transformations on the metal coordination sphere in homoleptic (1 and 2) and heteroleptic (3 and 4) Cu(ii) complexes were analyzed and investigated by crystallographic and quantum computational studies.
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Affiliation(s)
- Mahesha
- Department of Studies in Physics
- University of Mysore
- Mysuru-570 006
- India
| | - K. J. Pampa
- Department of Biotechnology
- University of Mysore
- Mysuru-570 006
- India
| | - C. S. Karthik
- Department of Chemistry
- SJCE
- JSS Science and Technology University
- Mysuru-570 006
- India
| | - M. K. Hema
- Department of Studies in Physics
- University of Mysore
- Mysuru-570 006
- India
| | - P. Mallu
- Department of Chemistry
- SJCE
- JSS Science and Technology University
- Mysuru-570 006
- India
| | - N. K. Lokanath
- Department of Studies in Physics
- University of Mysore
- Mysuru-570 006
- India
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15
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Kumar KS, Ruben M. Sublimierbare Spin‐Crossover‐Komplexe: Vom Schalten des Spinzustands zu molekularen Bauelementen. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201911256] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Kuppusamy Senthil Kumar
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) CNRS-Université de Strasbourg 23, rue du Loess, BP 43 67034 Strasbourg cedex 2 Frankreich
| | - Mario Ruben
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) CNRS-Université de Strasbourg 23, rue du Loess, BP 43 67034 Strasbourg cedex 2 Frankreich
- Institut für Nanotechnologie Karlsruher Institut für Technologie (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Deutschland
- Institut für Quantenmaterialien und -technologien Karlsruher Institut für Technologie (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Deutschland
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16
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Ridier K, Bas AC, Zhang Y, Routaboul L, Salmon L, Molnár G, Bergaud C, Bousseksou A. Unprecedented switching endurance affords for high-resolution surface temperature mapping using a spin-crossover film. Nat Commun 2020; 11:3611. [PMID: 32681047 PMCID: PMC7367879 DOI: 10.1038/s41467-020-17362-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 06/23/2020] [Indexed: 11/28/2022] Open
Abstract
Temperature measurement at the nanoscale is of paramount importance in the fields of nanoscience and nanotechnology, and calls for the development of versatile, high-resolution thermometry techniques. Here, the working principle and quantitative performance of a cost-effective nanothermometer are experimentally demonstrated, using a molecular spin-crossover thin film as a surface temperature sensor, probed optically. We evidence highly reliable thermometric performance (diffraction-limited sub-µm spatial, µs temporal and 1 °C thermal resolution), which stems to a large extent from the unprecedented quality of the vacuum-deposited thin films of the molecular complex [Fe(HB(1,2,4-triazol-1-yl)3)2] used in this work, in terms of fabrication and switching endurance (>107 thermal cycles in ambient air). As such, our results not only afford for a fully-fledged nanothermometry method, but set also a forthcoming stage in spin-crossover research, which has awaited, since the visionary ideas of Olivier Kahn in the 90’s, a real-world, technological application. Developing novel thermometry techniques for nanoscale temperature measurements are vital for realizing efficient thermal management of nanoscale devices. Here, the authors report thermally stable spin-crossover material-based nanothermometers for high-resolution surface temperature mapping.
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Affiliation(s)
- Karl Ridier
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, 205 route de Narbonne, F-31077, Toulouse, France
| | - Alin-Ciprian Bas
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, 205 route de Narbonne, F-31077, Toulouse, France
| | - Yuteng Zhang
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, 205 route de Narbonne, F-31077, Toulouse, France
| | - Lucie Routaboul
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, 205 route de Narbonne, F-31077, Toulouse, France
| | - Lionel Salmon
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, 205 route de Narbonne, F-31077, Toulouse, France
| | - Gábor Molnár
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, 205 route de Narbonne, F-31077, Toulouse, France.
| | - Christian Bergaud
- Laboratoire d'Analyse et d'Architecture des Systèmes, CNRS UPR 8001, 7 avenue du Colonel Roche, F-31400, Toulouse, France
| | - Azzedine Bousseksou
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, 205 route de Narbonne, F-31077, Toulouse, France.
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17
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Ridier K, Zhang Y, Piedrahita-Bello M, Quintero CM, Salmon L, Molnár G, Bergaud C, Bousseksou A. Heat Capacity and Thermal Damping Properties of Spin-Crossover Molecules: A New Look at an Old Topic. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2000987. [PMID: 32301210 DOI: 10.1002/adma.202000987] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 03/13/2020] [Accepted: 03/24/2020] [Indexed: 06/11/2023]
Abstract
The thermally induced spin-crossover (SCO) phenomenon in transition metal complexes is an entropy-driven process, which has been extensively studied through calorimetric methods. Yet, the excess heat capacity associated with the molecular spin-state switching has never been explored for practical applications. Herein, the thermal damping effect of an SCO film is experimentally assessed by monitoring the transient heating response of SCO-coated metallic microwires, Joule-heated by current pulses. A damping of the wire temperature, up to 10%, is evidenced on a time scale of tens of microseconds due to the spin-state switching of the molecular film. Fast heat-charging dynamics and negligible fatigability are demonstrated, which, together with the solid-solid nature of the spin transition, appear as promising features for achieving thermal energy management applications in functional devices.
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Affiliation(s)
- Karl Ridier
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, 205 route de Narbonne, Toulouse, F-31077, France
| | - Yuteng Zhang
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, 205 route de Narbonne, Toulouse, F-31077, France
| | - Mario Piedrahita-Bello
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, 205 route de Narbonne, Toulouse, F-31077, France
| | - Carlos M Quintero
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, 205 route de Narbonne, Toulouse, F-31077, France
- Laboratoire d'Analyse et d'Architecture des Systèmes, CNRS UPR 8001, 7 avenue du Colonel Roche, Toulouse, F-31400, France
| | - Lionel Salmon
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, 205 route de Narbonne, Toulouse, F-31077, France
| | - Gábor Molnár
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, 205 route de Narbonne, Toulouse, F-31077, France
| | - Christian Bergaud
- Laboratoire d'Analyse et d'Architecture des Systèmes, CNRS UPR 8001, 7 avenue du Colonel Roche, Toulouse, F-31400, France
| | - Azzedine Bousseksou
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, 205 route de Narbonne, Toulouse, F-31077, France
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18
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Senthil Kumar K, Vela S, Heinrich B, Suryadevara N, Karmazin L, Bailly C, Ruben M. Bi-stable spin-crossover in charge-neutral [Fe(R-ptp) 2] (ptp = 2-(1H-pyrazol-1-yl)-6-(1H-tetrazol-5-yl)pyridine) complexes. Dalton Trans 2019; 49:1022-1031. [PMID: 31859300 DOI: 10.1039/c9dt04411f] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Bi-stable charge-neutral iron(ii) spin-crossover (SCO) complexes are a class of switchable molecular materials proposed for molecule-based switching and memory applications. In this study, we report on the SCO behavior of a series of iron(ii) complexes composed of rationally designed 2-(1H-pyrazol-1-yl)-6-(1H-tetrazol-5-yl)pyridine (ptp) ligands. The powder forms of [Fe2+(R-ptp-)2]0 complexes tethered with less-bulky substituents-R = H (1), R = CH2OH (2), and R = COOCH3 (3; previously reported)-at the 4-position of the pyridine ring of the ptp skeleton showed abrupt and hysteretic SCO at or above room temperature (RT), whereas complex 5 featuring a bulky pyrene substituent showed incomplete and gradual SCO behavior. The role of intermolecular interactions, lattice solvent, and electronic nature of the chemical substituents (R) in tuning the SCO of the complexes is elucidated.
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Affiliation(s)
- Kuppusamy Senthil Kumar
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS-Université de Strasbourg, 23, rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France.
| | - Sergi Vela
- Laboratoire de Chimie Quantique, Institut de Chimie, UMR 7177 CNRS-Université de Strasbourg, 4 rue Blaise Pascal, 67081 Strasbourg, France.
| | - Benoît Heinrich
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS-Université de Strasbourg, 23, rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France.
| | - Nithin Suryadevara
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
| | - Lydia Karmazin
- Service de Radiocristallographie, Fédération de Chimie Le Bel, FR2010 CNRS-Université de Strasbourg, 1 rue Blaise Pascal, BP 296/R8, 67008 Strasbourg Cedex, France
| | - Corinne Bailly
- Service de Radiocristallographie, Fédération de Chimie Le Bel, FR2010 CNRS-Université de Strasbourg, 1 rue Blaise Pascal, BP 296/R8, 67008 Strasbourg Cedex, France
| | - Mario Ruben
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS-Université de Strasbourg, 23, rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France. and Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
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19
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Enríquez-Cabrera A, Routaboul L, Salmon L, Bousseksou A. Complete post-synthetic modification of a spin crossover complex. Dalton Trans 2019; 48:16853-16856. [PMID: 31693038 DOI: 10.1039/c9dt03587g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The post-synthetic reaction between p-anisaldehyde and the spin-crossover compound [Fe(NH2-trz)3](NO3)2 was explored, obtaining different degrees of transformation from 23% to full conversion by varying the reaction time. The post-synthetic SCO complexes obtained were studied by magnetometry, powder X-ray diffraction (PXRD), elemental analysis, solid state NMR and IR and compared with the corresponding compounds obtained by direct synthetic routes, revealing new spin crossover properties.
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Affiliation(s)
| | | | - Lionel Salmon
- LCC, CNRS, 205 route de Narbonne, 31077 Toulouse, France.
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20
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Shalabaeva V, Bas AC, Piedrahita-Bello M, Ridier K, Salmon L, Thibault C, Nicolazzi W, Molnár G, Bousseksou A. Direct Visualization of Local Spin Transition Behaviors in Thin Molecular Films by Bimodal AFM. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1903892. [PMID: 31617319 DOI: 10.1002/smll.201903892] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 09/05/2019] [Indexed: 06/10/2023]
Abstract
Thin films of the molecular spin-crossover complex [Fe(HB(1,2,4-triazol-1-yl)3 )2 ] undergo spin transition above room temperature, which can be exploited in sensors, actuators, and information processing devices. Variable temperature viscoelastic mapping of the films by atomic force microscopy reveals a pronounced decrease of the elastic modulus when going from the low spin (5.2 ± 0.4 GPa) to the high spin (3.6 ± 0.2 GPa) state, which is also accompanied by increasing energy dissipation. This technique allows imaging, with high spatial resolution, of the formation of high spin puddles around film defects, which is ascribed to local strain relaxation. On the other hand, no clustering process due to cooperative phenomena was observed. This experimental approach sets the stage for the investigation of spin transition at the nanoscale, including phase nucleation and evolution as well as local strain effects.
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Affiliation(s)
| | - Alin-Ciprian Bas
- LCC, CNRS and Université de Toulouse, UPS, INP, F-31077, Toulouse, France
- LAAS, CNRS and Université de Toulouse, INSA, UPS, F-31077, Toulouse, France
| | | | - Karl Ridier
- LCC, CNRS and Université de Toulouse, UPS, INP, F-31077, Toulouse, France
| | - Lionel Salmon
- LCC, CNRS and Université de Toulouse, UPS, INP, F-31077, Toulouse, France
| | | | - William Nicolazzi
- LCC, CNRS and Université de Toulouse, UPS, INP, F-31077, Toulouse, France
| | - Gábor Molnár
- LCC, CNRS and Université de Toulouse, UPS, INP, F-31077, Toulouse, France
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21
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Ridier K, Bas AC, Shalabaeva V, Nicolazzi W, Salmon L, Molnár G, Bousseksou A, Lorenc M, Bertoni R, Collet E, Cailleau H. Finite Size Effects on the Switching Dynamics of Spin-Crossover Thin Films Photoexcited by a Femtosecond Laser Pulse. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1901361. [PMID: 31034107 DOI: 10.1002/adma.201901361] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 04/10/2019] [Indexed: 06/09/2023]
Abstract
Using ultrafast optical absorption spectroscopy, the room-temperature spin-state switching dynamics induced by a femtosecond laser pulse in high-quality thin films of the molecular spin-crossover (SCO) complex [Fe(HB(tz)3 )2 ] (tz = 1,2,4-triazol-1-yl) are studied. These measurements reveal that the early, sub-picosecond, low-spin to high-spin photoswitching event, with linear response to the laser pulse energy, can be followed under certain conditions by a second switching process occurring on a timescale of tens of nanoseconds, enabling nonlinear amplification. This out-of-equilibrium dynamics is discussed in light of the characteristic timescales associated with the different switching mechanisms, i.e., the electronic and structural rearrangements of photoexcited molecules, the propagation of strain waves at the material scale, and the thermal activation above the molecular energy barrier. Importantly, the additional, nonlinear switching step appears to be completely suppressed in the thinnest (50 nm) film due to the efficient heat transfer to the substrate, allowing the system to retrieve the thermal equilibrium state on the 100 ns timescale. These results provide a first milestone toward the assessment of the physical parameters that drive the photoresponse of SCO thin films, opening up appealing perspectives for their use as high-frequency all-optical switches working at room temperature.
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Affiliation(s)
- Karl Ridier
- Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse, 31077, Toulouse, France
| | - Alin-Ciprian Bas
- Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse, 31077, Toulouse, France
| | - Victoria Shalabaeva
- Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse, 31077, Toulouse, France
| | - William Nicolazzi
- Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse, 31077, Toulouse, France
| | - Lionel Salmon
- Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse, 31077, Toulouse, France
| | - Gábor Molnár
- Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse, 31077, Toulouse, France
| | - Azzedine Bousseksou
- Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse, 31077, Toulouse, France
| | - Maciej Lorenc
- Univ. Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000, Rennes, France
| | - Roman Bertoni
- Univ. Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000, Rennes, France
| | - Eric Collet
- Univ. Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000, Rennes, France
| | - Hervé Cailleau
- Univ. Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000, Rennes, France
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22
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Bas AC, Shalabaeva V, Thompson X, Vendier L, Salmon L, Thibault C, Molnár G, Routaboul L, Bousseksou A. Effects of solvent vapor annealing on the crystallinity and spin crossover properties of thin films of [Fe(HB(tz)3)2]. CR CHIM 2019. [DOI: 10.1016/j.crci.2019.03.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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23
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Bilayer Thin Films That Combine Luminescent and Spin Crossover Properties for an Efficient and Reversible Fluorescence Switching. MAGNETOCHEMISTRY 2019. [DOI: 10.3390/magnetochemistry5020028] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We report on the vacuum thermal deposition of bilayer thin films of the luminescent complex Ir(ppy)3, tris[2-phenylpyridinato-C2,N]iridium(III), and the spin crossover complex [Fe(HB(tz)3)2], bis[hydrotris(1,2,4-triazol-1-yl)borate]iron(II). Switching the spin state of iron ions from the low spin to the high spin state around 337 K leads to a reversible jump of the luminescence intensity, while the spectrum shape and the luminescence lifetime remain unchanged. The luminescence modulation occurs due to the different UV light absorption properties of the iron complex in the two spin states and its magnitude can therefore be precisely adjusted by varying the film thickness. These multilayer luminescence switches hold potential for micro- and nanoscale thermal sensing and imaging applications.
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Piedrahita-Bello M, Ridier K, Mikolasek M, Molnár G, Nicolazzi W, Salmon L, Bousseksou A. Drastic lattice softening in mixed triazole ligand iron(ii) spin crossover nanoparticles. Chem Commun (Camb) 2019; 55:4769-4772. [PMID: 30924832 DOI: 10.1039/c9cc01619h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A series of spin-crossover (SCO) coordination nanoparticles (ca. 60 nm) with the general formulae [Fe(Htrz)1+y-x(trz)2-y(NH2trz)x](BF4)y·nH2O (x = 0, 0.1, 0.2 and 0.3) were synthesized in concentrated solutions without using any surfactant or polymer. The nanoparticle powders were investigated by transmission electron microscopy, powder X-ray diffraction, magnetometry, calorimetry, Raman/IR spectroscopies, elemental analysis and 57Fe Mössbauer spectrometry. Remarkably, the latter revealed a large decrease of the lattice stiffness when incorporating a small amount of amino-triazole ligand, reflected by the drop of the Debye temperature from 285 K (x = 0) to 205 K (x = 0.3). This collapse of the lattice cohesion was attributed to a reorganization of the supramolecular interactions between the Fe-triazole chains. This effect on the SCO properties is also discussed.
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25
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Tailleur E, Marchivie M, Negrier P, Denux D, Massip S, Mondieig D, Chastanet G, Guionneau P. Using polymorphism to master the spin crossover mechanism in [Fe(PM-PeA)2(NCSe)2]. CrystEngComm 2019. [DOI: 10.1039/c9ce01137d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Polymorphism drives the mechanism of the spin-crossover in [Fe(PM-PeA)2(NCSe)2] single-crystals.
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26
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27
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Mikolasek M, Manrique-Juarez MD, Shepherd HJ, Ridier K, Rat S, Shalabaeva V, Bas AC, Collings IE, Mathieu F, Cacheux J, Leichle T, Nicu L, Nicolazzi W, Salmon L, Molnár G, Bousseksou A. Complete Set of Elastic Moduli of a Spin-Crossover Solid: Spin-State Dependence and Mechanical Actuation. J Am Chem Soc 2018; 140:8970-8979. [DOI: 10.1021/jacs.8b05347] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Mirko Mikolasek
- ESRF-The European Synchrotron, 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Maria D. Manrique-Juarez
- LCC-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
- LAAS-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Helena J. Shepherd
- School of Physical Sciences, University of Kent, Canterbury, CT2 7NH, United Kingdom
| | - Karl Ridier
- LCC-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Sylvain Rat
- LCC-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | | | | | - Ines E. Collings
- ESRF-The European Synchrotron, 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Fabrice Mathieu
- LAAS-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Jean Cacheux
- LAAS-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Thierry Leichle
- LAAS-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Liviu Nicu
- LAAS-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | | | - Lionel Salmon
- LCC-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Gábor Molnár
- LCC-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
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28
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Borgatti F, Torelli P, Brucale M, Gentili D, Panaccione G, Castan Guerrero C, Schäfer B, Ruben M, Cavallini M. Opposite Surface and Bulk Solvatochromic Effects in a Molecular Spin-Crossover Compound Revealed by Ambient Pressure X-ray Absorption Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:3604-3609. [PMID: 29510051 DOI: 10.1021/acs.langmuir.8b00028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We investigate the solvatochromic effect of a Fe-based spin-crossover (SCO) compound via ambient pressure soft X-ray absorption spectroscopy (AP-XAS) and atomic force microscopy (AFM). AP-XAS provides the direct evidence of the spin configuration for the Fe(II) 3d states of the SCO material upon in situ exposure to specific gas or vapor mixtures; concurrent changes in nanoscale topography and mechanical characteristics are revealed via AFM imaging and AFM-based force spectroscopy, respectively. We find that exposing the SCO material to gaseous helium promotes an effective decrease of the transition temperature of its surface layers, while the exposure to methanol vapor causes opposite surfacial and bulk solvatochromic effects. Surfacial solvatochromism is accompanied by a dramatic reduction of the surface layers stiffness. We propose a rationalization of the observed effects based on interfacial dehydration and solvation phenomena.
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Affiliation(s)
- Francesco Borgatti
- Consiglio Nazionale delle Ricerche , Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) , Via P. Gobetti 101 , Bologna 40129 , Italy
| | - Piero Torelli
- CNR-IOM , Tasc Laboratory , S.S. 14 Km 163.5 in Area Science Park , Basovizza , Trieste 34149 , Italy
| | - Marco Brucale
- Consiglio Nazionale delle Ricerche , Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) , Via P. Gobetti 101 , Bologna 40129 , Italy
| | - Denis Gentili
- Consiglio Nazionale delle Ricerche , Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) , Via P. Gobetti 101 , Bologna 40129 , Italy
| | - Giancarlo Panaccione
- CNR-IOM , Tasc Laboratory , S.S. 14 Km 163.5 in Area Science Park , Basovizza , Trieste 34149 , Italy
| | - Celia Castan Guerrero
- CNR-IOM , Tasc Laboratory , S.S. 14 Km 163.5 in Area Science Park , Basovizza , Trieste 34149 , Italy
| | - Bernhard Schäfer
- Institute of Nanotechnology , Karlsruhe Institute of Technology , Eggenstein-Leopoldshafen D-76344 , Germany
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) , CNRS-Université de Strasbourg , 23, rue du Loess, BP 43 , Strasbourg Cedex 2 67034 , France
| | - Mario Ruben
- Institute of Nanotechnology , Karlsruhe Institute of Technology , Eggenstein-Leopoldshafen D-76344 , Germany
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) , CNRS-Université de Strasbourg , 23, rue du Loess, BP 43 , Strasbourg Cedex 2 67034 , France
| | - Massimiliano Cavallini
- Consiglio Nazionale delle Ricerche , Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) , Via P. Gobetti 101 , Bologna 40129 , Italy
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29
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Campbell CJ, Muetterties AT, Chan BC, Reisner BA. New polymorphs of hydrotris(1,2,4-triazolyl)borate complexes with M2+ cations (M = Fe, Co, Ni, Zn). Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.01.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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30
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Luo YH, Chen C, Wang JW, He XT, Hong DL, An PJ, Wu HS, Sun BW. Confinement of Reagents in Crystalline Matrix with the Help of Magnetic Field. ChemistrySelect 2018. [DOI: 10.1002/slct.201702533] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yang-Hui Luo
- School of Chemistry and Chemical Engineering; Southeast University; Nanjing 211189 P.R. China
| | - Chen Chen
- School of Chemistry and Chemical Engineering; Southeast University; Nanjing 211189 P.R. China
| | - Jing-Wen Wang
- School of Chemistry and Chemical Engineering; Southeast University; Nanjing 211189 P.R. China
| | - Xiao-Tong He
- School of Chemistry and Chemical Engineering; Southeast University; Nanjing 211189 P.R. China
| | - Dan-Li Hong
- School of Chemistry and Chemical Engineering; Southeast University; Nanjing 211189 P.R. China
| | - Pei-Jing An
- School of Chemistry and Chemical Engineering; Southeast University; Nanjing 211189 P.R. China
| | - Hong-Shuai Wu
- School of Chemistry and Chemical Engineering; Southeast University; Nanjing 211189 P.R. China
| | - Bai-Wang Sun
- School of Chemistry and Chemical Engineering; Southeast University; Nanjing 211189 P.R. China
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31
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Ridier K, Rat S, Salmon L, Nicolazzi W, Molnár G, Bousseksou A. Scan-rate and vacuum pressure dependence of the nucleation and growth dynamics in a spin-crossover single crystal: the role of latent heat. Phys Chem Chem Phys 2018; 20:9139-9145. [DOI: 10.1039/c7cp08522b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A heat exchange dependence was evidenced on both the hysteresis properties and the switching dynamics of a spin-crossover single crystal.
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Affiliation(s)
- Karl Ridier
- Laboratoire de Chimie de Coordination (LCC-CNRS), Université de Toulouse, UPS, INP
- F-31077 Toulouse
- France
| | - Sylvain Rat
- Laboratoire de Chimie de Coordination (LCC-CNRS), Université de Toulouse, UPS, INP
- F-31077 Toulouse
- France
| | - Lionel Salmon
- Laboratoire de Chimie de Coordination (LCC-CNRS), Université de Toulouse, UPS, INP
- F-31077 Toulouse
- France
| | - William Nicolazzi
- Laboratoire de Chimie de Coordination (LCC-CNRS), Université de Toulouse, UPS, INP
- F-31077 Toulouse
- France
| | - Gábor Molnár
- Laboratoire de Chimie de Coordination (LCC-CNRS), Université de Toulouse, UPS, INP
- F-31077 Toulouse
- France
| | - Azzedine Bousseksou
- Laboratoire de Chimie de Coordination (LCC-CNRS), Université de Toulouse, UPS, INP
- F-31077 Toulouse
- France
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