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Observation of Two-Step Spin Transition in Graphene Oxide-Based Hybrids with Iron(II) 4-amino-1,2,4-triazole Spin Crossover Nanoparticles

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(NH(2)trz)(3)](Br(2)). By introducing different quantities of 0...

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Autores principales: Lalioti, Nikolia, Charitos, Alexander, Parthenios, John, Malina, Ondrej, Polaskova, Michaela, Petr, Martin, Tangoulis, Vassilis
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10421334/
https://www.ncbi.nlm.nih.gov/pubmed/37570787
http://dx.doi.org/10.3390/molecules28155816
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author Lalioti, Nikolia
Charitos, Alexander
Parthenios, John
Malina, Ondrej
Polaskova, Michaela
Petr, Martin
Tangoulis, Vassilis
author_facet Lalioti, Nikolia
Charitos, Alexander
Parthenios, John
Malina, Ondrej
Polaskova, Michaela
Petr, Martin
Tangoulis, Vassilis
author_sort Lalioti, Nikolia
collection PubMed
description 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(NH(2)trz)(3)](Br(2)). 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(NH(2)trz)(3)](Br(2)) 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 T(1/2) [Formula: see text] = 343 K and T(1/2) [Formula: see text] = 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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spelling pubmed-104213342023-08-12 Observation of Two-Step Spin Transition in Graphene Oxide-Based Hybrids with Iron(II) 4-amino-1,2,4-triazole Spin Crossover Nanoparticles Lalioti, Nikolia Charitos, Alexander Parthenios, John Malina, Ondrej Polaskova, Michaela Petr, Martin Tangoulis, Vassilis Molecules Article 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(NH(2)trz)(3)](Br(2)). 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(NH(2)trz)(3)](Br(2)) 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 T(1/2) [Formula: see text] = 343 K and T(1/2) [Formula: see text] = 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. MDPI 2023-08-02 /pmc/articles/PMC10421334/ /pubmed/37570787 http://dx.doi.org/10.3390/molecules28155816 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lalioti, Nikolia
Charitos, Alexander
Parthenios, John
Malina, Ondrej
Polaskova, Michaela
Petr, Martin
Tangoulis, Vassilis
Observation of Two-Step Spin Transition in Graphene Oxide-Based Hybrids with Iron(II) 4-amino-1,2,4-triazole Spin Crossover Nanoparticles
title Observation of Two-Step Spin Transition in Graphene Oxide-Based Hybrids with Iron(II) 4-amino-1,2,4-triazole Spin Crossover Nanoparticles
title_full Observation of Two-Step Spin Transition in Graphene Oxide-Based Hybrids with Iron(II) 4-amino-1,2,4-triazole Spin Crossover Nanoparticles
title_fullStr Observation of Two-Step Spin Transition in Graphene Oxide-Based Hybrids with Iron(II) 4-amino-1,2,4-triazole Spin Crossover Nanoparticles
title_full_unstemmed Observation of Two-Step Spin Transition in Graphene Oxide-Based Hybrids with Iron(II) 4-amino-1,2,4-triazole Spin Crossover Nanoparticles
title_short Observation of Two-Step Spin Transition in Graphene Oxide-Based Hybrids with Iron(II) 4-amino-1,2,4-triazole Spin Crossover Nanoparticles
title_sort observation of two-step spin transition in graphene oxide-based hybrids with iron(ii) 4-amino-1,2,4-triazole spin crossover nanoparticles
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10421334/
https://www.ncbi.nlm.nih.gov/pubmed/37570787
http://dx.doi.org/10.3390/molecules28155816
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