1
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Martinez-Martinez A, Albacete P, García-Hernández M, Resines-Urien E, Fairen-Jimenez D, Sánchez Costa J. Spin crossover {[Fe(atrz) 3](OTs) 2} n monolith: a green synthesis approach for Robust switchable materials. Dalton Trans 2024; 53:9257-9261. [PMID: 38775103 DOI: 10.1039/d4dt00684d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2024]
Abstract
This work presents a straightforward, room-temperature synthesis of a robust {[Fe(atrz)3](OTs)2}n monolith. This approach offers a green alternative to traditional nanoparticle synthesis for manipulating spin crossover (SCO) behaviour. The monolith exhibits a more gradual SCO transition at lower temperatures compared to the bulk material, aligning with observations in smaller particle systems. Notably, the synthesis employs a solvent- and surfactant-free approach, simplifying the process and potentially reducing environmental impact, aligning with the principles of green chemistry.
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Affiliation(s)
| | - Pablo Albacete
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Pembroke Street, Cambridge CB2 3RA, UK.
| | - Mar García-Hernández
- Instituto de Ciencia de Materiales de Madrid CSIC, C/Sor Juana Inés de la Cruz, 3, Madrid 28049, Spain
| | | | - David Fairen-Jimenez
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Pembroke Street, Cambridge CB2 3RA, UK.
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2
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Regueiro A, Martí-Carrascosa M, Torres-Cavanillas R, Coronado E. Unlocking room-temperature bistable spin transition at the nanoscale: the synthesis of core@shell [Fe(NH 2trz) 3(NO 3) 2]@SiO 2 nanoparticles. Dalton Trans 2024; 53:8764-8771. [PMID: 38712733 DOI: 10.1039/d4dt00911h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
In this work, we address the synthesis of stable spin-crossover nanoparticles capable of undergoing a hysteretic spin transition at room temperature. For this purpose, we use the reverse-micelle protocol to prepare naked [Fe(NH2trz)3](NO3)2 and core@shell [Fe(NH2trz)3](NO3)2@SiO2 nanoparticles. Through meticulous adjustment of synthetic parameters, we achieved nanoparticle sizes ranging from approximately 40 nm to 60 nm. Our findings highlight that [Fe(NH2trz)3](NO3)2 presents a modest thermal hysteresis of 7 K, which decreases by downsizing. Conversely, silica-coated nanoparticles with sizes of ca. 60 and 40 nm demonstrate a remarkable hysteretic response of approximately 30 K, switching their spin state around room temperature. Moreover, the presence of a SiO2 shell substantially enhances the nanoparticles' stability against oxidation. In this context, the larger 60 nm [Fe(NH2trz)3](NO3)2@SiO2 hybrid remains stable in water for up to two hours, enabling the observation of an unreported water-induced spin transition after 30 min. Therefore, this work also introduces an intriguing avenue for inducing spin transitions through solvent exchange, underscoring the versatility and potential of these nanoparticles.
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Affiliation(s)
- A Regueiro
- Instituto de Ciencia Molecular, Universitat de València, Catedrático José Beltrán 2, 46980, Paterna, Spain.
| | - M Martí-Carrascosa
- Instituto de Ciencia Molecular, Universitat de València, Catedrático José Beltrán 2, 46980, Paterna, Spain.
- Universitat Politecnica de Valencia, Nanophotonics Technology Center, Valencia, Spain
| | - R Torres-Cavanillas
- Instituto de Ciencia Molecular, Universitat de València, Catedrático José Beltrán 2, 46980, Paterna, Spain.
- Department of Materials, Oxford University, 21 Banbury Rd, Oxford OX2 6NN, UK.
| | - E Coronado
- Department of Materials, Oxford University, 21 Banbury Rd, Oxford OX2 6NN, UK.
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3
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Yang X, Enriquez-Cabrera A, Jacob K, Coppel Y, Salmon L, Bousseksou A. Room temperature spin crossover properties in a series of mixed-anion Fe(NH 2trz) 3(BF 4) 2-x(SiF 6) x/2 complexes. Dalton Trans 2024; 53:6830-6838. [PMID: 38546485 PMCID: PMC11019404 DOI: 10.1039/d4dt00267a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 03/24/2024] [Indexed: 04/17/2024]
Abstract
A series of mixed-anion Fe(NH2trz)3(BF4)2-x(SiF6)x/2 spin crossover complexes is obtained modifying the reaction time but also using an increase amount of tetraethyl orthosilicate as the source for the production and the incorporation of SiF62- competing with the BF42- anions present in the mother solution. The increase of the SiF62- anion inclusion to the detriment of the BF4- counterpart induces a shift of the temperature transition toward high temperatures leading to interesting bistability properties around room temperature with T1/2 spanning from 300 K to 325 K. Moreover, the implementation of a solid-liquid post synthetic modification approach from the Fe(NH2trz)3(BF4)2 parent complex with identical TEOS proportions and under certain experimental conditions lead systematically to the same Fe(NH2trz)3(BF4)1.2(SiF6)0.4 composition. This compound presents an abrupt spin crossover behaviour with a narrow hysteresis loop just above room temperature (320 K), which is stable under thermal cycling and along time with no specific storage conditions. Such crystalline powder sample incorporates homogeneous rod-shaped particles whose formation and physical properties can be followed simultaneously using infra-red spectroscopy, dynamic light scattering (DLS), transmission electronic microscopy (TEM) and optical reflectance. The observation of a stabilized single ca. 800 nm population of mixed-anion particles starting from insoluble various sizes (from nano- to microscale) Fe(NH2trz)3(BF4)2 particles supports the key role of the solvent (water molecules) on the separation, the reactivity and the reorganization of the 1D iron-triazole chains forming the packing of the structure.
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Affiliation(s)
- Xinyu Yang
- LCC, CNRS & Université de Toulouse (UPS, INP), 31077 Toulouse, France.
| | | | - Kane Jacob
- LCC, CNRS & Université de Toulouse (UPS, INP), 31077 Toulouse, France.
| | - Yannick Coppel
- LCC, CNRS & Université de Toulouse (UPS, INP), 31077 Toulouse, France.
| | - Lionel Salmon
- LCC, CNRS & Université de Toulouse (UPS, INP), 31077 Toulouse, France.
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4
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Torres-Cavanillas R, Gavara-Edo M, Coronado E. Bistable Spin-Crossover Nanoparticles for Molecular Electronics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2307718. [PMID: 37725707 DOI: 10.1002/adma.202307718] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 08/25/2023] [Indexed: 09/21/2023]
Abstract
The field of spin-crossover complexes is rapidly evolving from the study of the spin transition phenomenon to its exploitation in molecular electronics. Such spin transition is gradual in a single-molecule, while in bulk it can be abrupt, showing sometimes thermal hysteresis and thus a memory effect. A convenient way to keep this bistability while reducing the size of the spin-crossover material is to process it as nanoparticles (NPs). Here, the most recent advances in the chemical design of these NPs and their integration into electronic devices, paying particular attention to optimizing the switching ratio are reviewed. Then, integrating spin-crossover NPs over 2D materials is focused to improve the endurance, performance, and detection of the spin state in these hybrid devices.
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Affiliation(s)
- Ramón Torres-Cavanillas
- Instituto de Ciencia Molecular, Universitat de València, Valencia, 46980, Spain
- Department of Materials, Oxford University, Oxford, OX2 6NN, UK
| | - Miguel Gavara-Edo
- Instituto de Ciencia Molecular, Universitat de València, Valencia, 46980, Spain
| | - Eugenio Coronado
- Instituto de Ciencia Molecular, Universitat de València, Valencia, 46980, Spain
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5
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Lalioti N, Charitos A, Parthenios J, Malina O, Polaskova M, Petr M, Tangoulis V. Observation of Two-Step Spin Transition in Graphene Oxide-Based Hybrids with Iron(II) 4-amino-1,2,4-triazole Spin Crossover Nanoparticles. Molecules 2023; 28:5816. [PMID: 37570787 PMCID: PMC10421334 DOI: 10.3390/molecules28155816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 07/28/2023] [Accepted: 07/31/2023] [Indexed: 08/13/2023] Open
Abstract
A novel experimental protocol based on a reverse micellar method is presented for the synthesis of graphene oxide (GO)-based hybrids with spin crossover nanoparticles (SCO NPs) of the 1D iron(II) coordination polymer with the formula [Fe(NH2trz)3](Br2). By introducing different quantities of 0.5% and 1.0% of GO (according to iron(II)) into the aqueous phase, two hybrids, NP4 and NP5, were synthesized, respectively. The morphological homogeneity of the NPs on the surface of the GO flakes is greatly improved in comparison to the pristine [Fe(NH2trz)3](Br2) NPs. From the magnetic point of view and at a low magnetic sweep rate of 1 K/min, a two-step hysteretic behavior is observed for NP4 and NP5, where the onset of the low-temperature second step appeared at 40% and 30% of the HS fraction, respectively. For faster sweep rates of 5-10 K/min, the two steps from the cooling branch are progressively smeared out, and the critical temperatures observed are T1/2↑ = 343 K and T1/2↓ = 288 K, with a thermal width of 55 K for both NP4 and NP5. A Raman laser power-assisted protocol was used to monitor the thermal tolerance of the hybrids, while XPS analysis revealed electronic interactions between the SCO NPs and the GO flakes.
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Affiliation(s)
- Nikolia Lalioti
- Laboratory of Inorganic Chemistry, Department of Chemistry, University of Patras, 26504 Patras, Greece; (A.C.); (V.T.)
| | - Alexander Charitos
- Laboratory of Inorganic Chemistry, Department of Chemistry, University of Patras, 26504 Patras, Greece; (A.C.); (V.T.)
| | - John Parthenios
- Institute of Chemical Engineering Sciences (ICE-HT), Foundation for Research and Technology-Hellas (FORTH), 26504 Patras, Greece;
| | - Ondrej Malina
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, Křížkovského 511/8, 77900 Olomouc, Czech Republic; (M.P.); (M.P.)
| | - Michaela Polaskova
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, Křížkovského 511/8, 77900 Olomouc, Czech Republic; (M.P.); (M.P.)
| | - Martin Petr
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, Křížkovského 511/8, 77900 Olomouc, Czech Republic; (M.P.); (M.P.)
| | - Vassilis Tangoulis
- Laboratory of Inorganic Chemistry, Department of Chemistry, University of Patras, 26504 Patras, Greece; (A.C.); (V.T.)
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6
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Yang X, Enriquez-Cabrera A, Toha D, Coppel Y, Salmon L, Bousseksou A. Spin crossover in mixed-anion Fe(NH 2trz) 3(BF 4)(SiF 6) 0.5 crystalline rod-shaped particles: the strength of the solid-liquid post synthetic modification. Dalton Trans 2023. [PMID: 37485867 DOI: 10.1039/d3dt02003g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
A pure mixed-anion Fe(NH2trz)3(BF4)(SiF6)0.5 spin crossover complex is obtained implementing a solid-liquid post synthetic modification approach from the Fe(NH2trz)3(BF4)2 parent complex. This method allows obtaining highly crystalline powder samples incorporating homogeneous micrometric (1 μm long) rod-shaped particles. This compound presents an abrupt spin crossover behaviour with a narrow (10 K) hysteresis loop centred just above room temperature (320 K) which makes it very interesting for future integration into devices for various applications.
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Affiliation(s)
- Xinyu Yang
- LCC, CNRS & Université de Toulouse (UPS, INP), 31077 Toulouse, France.
| | | | - Dorian Toha
- LCC, CNRS & Université de Toulouse (UPS, INP), 31077 Toulouse, France.
| | - Yannick Coppel
- LCC, CNRS & Université de Toulouse (UPS, INP), 31077 Toulouse, France.
| | - Lionel Salmon
- LCC, CNRS & Université de Toulouse (UPS, INP), 31077 Toulouse, France.
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7
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Zygouri E, Stathis A, Couris S, Tangoulis V. Nanocomposites Based on Spin-Crossover Nanoparticles and Silica-Coated Gold Nanorods: A Nonlinear Optical Study. Molecules 2023; 28:molecules28104200. [PMID: 37241938 DOI: 10.3390/molecules28104200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 05/17/2023] [Accepted: 05/18/2023] [Indexed: 05/28/2023] Open
Abstract
A nanocomposite based on silica-coated AuNRs with the aminated silica-covered spin-crossover nanoparticles (SCO NPs) of the 1D iron(II) coordination polymer with the formula [Fe(Htrz)2(trz)](BF4) is presented. For the synthesis of the SCO NPs, the reverse micelle method was used, while the gold nanorods (AuNRs) were prepared with the aspect ratio AR = 6.0 using the seeded-growth method and a binary surfactant mixture composed of cetyltrimethylammonium bromide (CTAB) and sodium oleate (NaOL). The final nanocomposite was prepared using the heteroaggregation method of combining different amounts of SCO NPs with the AuNRs. The nonlinear optical (NLO) properties of the hybrid AuNRs coated with different amounts of SCO NPs were studied in detail by means of the Z-scan technique, revealing that the third-order NLO properties of the AuNRs@SCO are dependent on the amount of SCO NPs grafted onto them. However, due to the resonant nature of the excitation, SCO-induced NLO switching was not observed.
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Affiliation(s)
- Eleni Zygouri
- Laboratory of Inorganic Chemistry, Department of Chemistry, University of Patras, 26504 Patras, Greece
| | - Aristeidis Stathis
- Department of Physics, University of Patras, 26504 Patras, Greece
- Institute of Chemical Engineering Sciences (ICE-HT), Foundation for Research and Technology-Hellas (FORTH), 26504 Patras, Greece
| | - Stelios Couris
- Department of Physics, University of Patras, 26504 Patras, Greece
- Institute of Chemical Engineering Sciences (ICE-HT), Foundation for Research and Technology-Hellas (FORTH), 26504 Patras, Greece
| | - Vassilis Tangoulis
- Laboratory of Inorganic Chemistry, Department of Chemistry, University of Patras, 26504 Patras, Greece
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8
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Sanchis-Gual R, Coronado-Puchau M, Mallah T, Coronado E. Hybrid nanostructures based on gold nanoparticles and functional coordination polymers: Chemistry, physics and applications in biomedicine, catalysis and magnetism. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2023.215025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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9
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Lalioti N, Giannopoulou E, Charitos A, Parthenios J, Malina O, Polaskova M, Kalarakis A, Tangoulis V. Observation of two-step spin transition in iron(II) 4-amino-1,2,4-triazole based spin crossover nanoparticles. Dalton Trans 2023; 52:2937-2941. [PMID: 36825841 DOI: 10.1039/d2dt04118a] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
A synthetically controllable two-step spin transition was observed in iron(II) spin crossover nanoparticles of the dehydrated one-dimensional coordination polymer [Fe(NH2trz)3]Br2 (NH2trz = 4-amino-1,2,4-triazole) using the reverse micellar method. The change from two-step to one-step hysteretic characteristics succeeded by changing the reaction time.
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Affiliation(s)
- Nikolia Lalioti
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504 Patras, Greece.
| | - Efstathia Giannopoulou
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504 Patras, Greece.
| | - Alexander Charitos
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504 Patras, Greece.
| | - John Parthenios
- Institute of Chemical Engineering Sciences, Foundation of Research and Technology-Hellas (FORTH/ICE-HT), Stadiou Street, Platani, Patras, 26504 Greece
| | - Ondrej Malina
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, Křížkovského 511/8, 77900, Czech Republic.
| | - Michaela Polaskova
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, Křížkovského 511/8, 77900, Czech Republic.
| | - Alexandros Kalarakis
- Department of Mechanical Engineering, University of the Peloponnese, 26334 Patras, Greece
| | - Vassilis Tangoulis
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504 Patras, Greece.
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10
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Molecular memory near room temperature in an iron polyanionic complex. Chem 2022. [DOI: 10.1016/j.chempr.2022.09.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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11
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Blanco AA, Adams DJ, Azoulay JD, Spinu L, Wiley JB. Synthesis and Characterization of [Fe(Htrz) 2(trz)](BF 4)] Nanocubes. Molecules 2022; 27:1213. [PMID: 35209000 PMCID: PMC8874602 DOI: 10.3390/molecules27041213] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 02/03/2022] [Accepted: 02/05/2022] [Indexed: 11/16/2022] Open
Abstract
Compounds that exhibit spin-crossover (SCO) type behavior have been extensively investigated due to their ability to act as molecular switches. Depending on the coordinating ligand, in this case 1H-1,2,4-triazole, and the crystallite size of the SCO compound produced, the energy requirement for the spin state transition can vary. Here, SCO [Fe(Htrz)2(trz)](BF4)] nanoparticles were synthesized using modified reverse micelle methods. Reaction conditions and reagent ratios are strictly controlled to produce nanocubes of 40-50 nm in size. Decreases in energy requirements are seen in both thermal and magnetic transitions for the smaller sized crystallites, where, compared to bulk materials, a decrease of as much as 20 °C can be seen in low to high spin state transitions.
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Affiliation(s)
- Alexis A. Blanco
- Departments of Chemistry and Physics, Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148, USA; (A.A.B.); (L.S.)
| | - Daniel J. Adams
- School of Polymer Science and Engineering, The University of Southern Mississippi, Hattiesburg, MS 39406, USA; (D.J.A.); (J.D.A.)
| | - Jason D. Azoulay
- School of Polymer Science and Engineering, The University of Southern Mississippi, Hattiesburg, MS 39406, USA; (D.J.A.); (J.D.A.)
| | - Leonard Spinu
- Departments of Chemistry and Physics, Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148, USA; (A.A.B.); (L.S.)
| | - John B. Wiley
- Departments of Chemistry and Physics, Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148, USA; (A.A.B.); (L.S.)
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12
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Enríquez-Cabrera A, Getzner L, Salmon L, Routaboul L, Bousseksou A. Post-synthetic modification mechanism for 1D spin crossover coordination polymers. NEW J CHEM 2022. [DOI: 10.1039/d2nj04015h] [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
Suitable solvent os crucial to achieve a quantitative PSM reaction. Then, this method is not restricted to porous materials.
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Affiliation(s)
| | - Livia Getzner
- LCC, CNRS, 205 route de Narbonne, 31077 Toulouse, France
| | - Lionel Salmon
- LCC, CNRS, 205 route de Narbonne, 31077 Toulouse, France
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13
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Zan Y, Salmon L, Bousseksou A. Morphological Studies of Composite Spin Crossover@SiO 2 Nanoparticles. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:3169. [PMID: 34947517 PMCID: PMC8706634 DOI: 10.3390/nano11123169] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 11/17/2021] [Accepted: 11/18/2021] [Indexed: 12/03/2022]
Abstract
Spin crossover (SCO) iron (II) 1,2,4-triazole-based coordination compounds in the form of composite SCO@SiO2 nanoparticles were prepared using a reverse microemulsion technique. The thickness of the silica shell and the morphology of the as obtained core@shell nanoparticles were studied by modifying the polar phase/surfactant ratio (ω), as well as the quantity and the insertion phase (organic, aqueous and micellar phases) of the tetraethylorthosilicate (TEOS) precursor, the quantity of ammonia and the reaction temperature. The morphology of the nanoparticles was monitored by transmission electron microscopy (TEM/HRTEM) while their composition probed by combined elemental analyses, thermogravimetry and EDX analyses. We report that not only the particle size can be controlled but also the size of the silica shell, allowing for interesting perspectives in post-synthetic modification of the shell. The evolution of the spin crossover properties associated with the change in morphology was investigated by variable temperature optical and magnetic measurements.
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Affiliation(s)
| | - Lionel Salmon
- Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse (INPT, UPS), 205 Route de Narbonne, 31400 Toulouse, France;
| | - Azzedine Bousseksou
- Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse (INPT, UPS), 205 Route de Narbonne, 31400 Toulouse, France;
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14
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Torres-Cavanillas R, Morant-Giner M, Escorcia-Ariza G, Dugay J, Canet-Ferrer J, Tatay S, Cardona-Serra S, Giménez-Marqués M, Galbiati M, Forment-Aliaga A, Coronado E. Spin-crossover nanoparticles anchored on MoS 2 layers for heterostructures with tunable strain driven by thermal or light-induced spin switching. Nat Chem 2021; 13:1101-1109. [PMID: 34621077 DOI: 10.1038/s41557-021-00795-y] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 08/11/2021] [Indexed: 11/09/2022]
Abstract
In the past few years, the effect of strain on the optical and electronic properties of MoS2 layers has attracted particular attention as it can improve the performance of optoelectronic and spintronic devices. Although several approaches have been explored, strain is typically externally applied on the two-dimensional material. In this work, we describe the preparation of a reversible 'self-strainable' system in which the strain is generated at the molecular level by one component of a MoS2-based composite material. Spin-crossover nanoparticles were covalently grafted onto functionalized layers of semiconducting MoS2 to form a hybrid heterostructure. Their ability to switch between two spin states on applying an external stimulus (light irradiation or temperature change) serves to generate strain over the MoS2 layer. A volume change accompanies this spin crossover, and the created strain induces a substantial and reversible change of the electrical and optical properties of the heterostructure.
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Affiliation(s)
| | - Marc Morant-Giner
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Paterna, Spain
| | | | - Julien Dugay
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Paterna, Spain
| | - Josep Canet-Ferrer
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Paterna, Spain
| | - Sergio Tatay
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Paterna, Spain
| | | | | | - Marta Galbiati
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Paterna, Spain
| | | | - Eugenio Coronado
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Paterna, Spain.
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15
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Gkolfi P, Tsivaka D, Tsougos I, Vassiou K, Malina O, Polaskova M, Polyzou CD, Chasapis CT, Tangoulis V. A facile approach to prepare silica hybrid, spin-crossover water-soluble nanoparticles as potential candidates for thermally responsive MRI agents. Dalton Trans 2021; 50:13227-13231. [PMID: 34546269 DOI: 10.1039/d1dt02479e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A reverse micelle method was used for the synthesis of water-soluble silica hybrid, spin-crossover (SCO) nanoparticles (NPs). MRI experiments provided temperature dependent T2 values, indicating their potential use as smart MRI agents, while lyophilization of NP dispersions in water yielded powders with a preserved but modified thermal hysteretic magnetic profile.
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Affiliation(s)
- Patroula Gkolfi
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504, Patras, Greece.
| | - Dimitra Tsivaka
- Department of Medical Physics, University Hospital of Larissa, University of Thessaly, Biopolis, GR-41110 Larissa, Greece.
| | - Ioannis Tsougos
- Department of Medical Physics, University Hospital of Larissa, University of Thessaly, Biopolis, GR-41110 Larissa, Greece.
| | - Katerina Vassiou
- Department of Radiology, University Hospital of Larissa, University of Thessaly, Biopolis, GR-41110 Larissa, Greece
| | - Ondřej Malina
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, Czech Republic.
| | - Michaela Polaskova
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, Czech Republic. .,Department of Experimental Physics, Faculty of Science, Palacký University Olomouc, 17. Listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Christina D Polyzou
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504, Patras, Greece.
| | - Christos T Chasapis
- NMR Facility, Instrumental Analysis Laboratory, School of Natural Sciences, University of Patras, 26504, Patras, Greece
| | - Vassilis Tangoulis
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504, Patras, Greece.
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Sanchis-Gual R, Torres-Cavanillas R, Coronado-Puchau M, Giménez-Marqués M, Coronado E. Plasmon-assisted spin transition in gold nanostar@spin crossover heterostructures. JOURNAL OF MATERIALS CHEMISTRY. C 2021; 9:10811-10818. [PMID: 35360440 PMCID: PMC8900490 DOI: 10.1039/d1tc01943k] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 06/02/2021] [Indexed: 06/01/2023]
Abstract
Herein we report the design of core@shell nanoparticles formed by a metallic Au nanostar core and a spin-crossover shell based on the coordination polymer [Fe(Htrz)2(trz)](BF4). This procedure is general and has been extended to other metallic morphologies (nanorods, nanotriangles). Thanks to the photothermal effect arising from the plasmonic properties of the Au nanostar, 60% of iron centers undergo a thermal spin transition inside the thermal hysteresis triggered by a 808 nm laser low intensity irradiation. Compared to other Au morphologies, the great advantage of the nanostar shape arises from the hot spots created at the branches of the nanostar. These hot spots give rise to large NIR absorptions, making them ideal nanostructures for efficiently converting light into heat using low energy light, like that provided by a 808 nm laser.
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Affiliation(s)
- Roger Sanchis-Gual
- Instituto de Ciencia Molecular, Universitat de València Catedrático José Beltran 2 46980 Paterna Spain
| | - Ramón Torres-Cavanillas
- Instituto de Ciencia Molecular, Universitat de València Catedrático José Beltran 2 46980 Paterna Spain
| | - Marc Coronado-Puchau
- Instituto de Ciencia Molecular, Universitat de València Catedrático José Beltran 2 46980 Paterna Spain
| | - Mónica Giménez-Marqués
- Instituto de Ciencia Molecular, Universitat de València Catedrático José Beltran 2 46980 Paterna Spain
| | - Eugenio Coronado
- Instituto de Ciencia Molecular, Universitat de València Catedrático José Beltran 2 46980 Paterna Spain
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Zoppellaro G, Čépe K, Aparicio C, Ugolotti J, Zbořil R. Enhancing Magnetic Cooperativity in Fe(II) Triazole-based Spin-crossover Nanoparticles by Pluronic Matrix Confinement. Chem Asian J 2020; 15:2637-2641. [PMID: 32644284 DOI: 10.1002/asia.202000623] [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: 05/22/2020] [Revised: 07/07/2020] [Indexed: 11/11/2022]
Abstract
Polymeric one-dimensional (1D) triazole-based FeII spin crossover nanoparticles have been entrapped in pluronic P123 matrix, forming nanorods in which the interaction between host (P123) and guest (FeII complex) promoted high reproducibility of the spin crossover process, significant shifts of the transition temperatures (T↑=370 K, T↓=338 K for the P123 entrapped material vs the literature values of T↑=358 K, T↓=341 K for the neat/polymer free system) and larger magnetic hysteresis width.
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Affiliation(s)
- Giorgio Zoppellaro
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Ŝlechtitelů 27, 78371, Olomouc, Czech Republic
| | - Klára Čépe
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Ŝlechtitelů 27, 78371, Olomouc, Czech Republic
| | - Claudia Aparicio
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Ŝlechtitelů 27, 78371, Olomouc, Czech Republic
| | - Juri Ugolotti
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Ŝlechtitelů 27, 78371, Olomouc, Czech Republic
| | - Radek Zbořil
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Ŝlechtitelů 27, 78371, Olomouc, Czech Republic
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