Triggering Two-Step Spin Bistability and Large Hysteresis in Spin Crossover Nanoparticles via Molecular Nanoengineering

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F17%3A73582648" target="_blank" >RIV/61989592:15310/17:73582648 - isvavai.cz</a>

Výsledek na webu

<a href="http://pubs.acs.org/doi/10.1021/acs.chemmater.7b03633" target="_blank" >http://pubs.acs.org/doi/10.1021/acs.chemmater.7b03633</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.chemmater.7b03633" target="_blank" >10.1021/acs.chemmater.7b03633</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Triggering Two-Step Spin Bistability and Large Hysteresis in Spin Crossover Nanoparticles via Molecular Nanoengineering

Popis výsledku v původním jazyce

The local entrapment of the spin crossover complex Fe(II)-tris[2-(2&apos;-pyridyl)benzimidazole] into the pluronic polymeric matrix (P123, PEG20-PPG70-PEG20, MW similar to 5800) yielded the formation of magnetic nanoparticles of similar to 26 nm (SCO-Np). Formation of SCO-Np was driven by the emergence of noncovalent interactions between the aromatic-NH group of the benzimidazole moieties present in Fe(II)-tris[2-(2&apos;-pyridyl)benzimidazole] with the aliphatic ether (-O-) groups of the pluronic polymeric matrix. The nanoparticles show spin crossover behavior, two-step spin bistability, and wide magnetic hysteresis, expressed in the temperature range of 170-280 K (Delta T-max = 38 K). The neat SCO molecules, Fe(II)-tris[2-(2&apos;-pyridyl)benzimidazole], on the contrary show only first-order spin transition and negligible hysteresis. The developed matrix-confinement approach of SCO molecules shown in this work yielded an unprecedented and significant improvement of the magnetic cooperativity compared to the neat spin crossover system, despite the decreased dimension of the magnetic domain in the nanosized architecture.

Název v anglickém jazyce

Triggering Two-Step Spin Bistability and Large Hysteresis in Spin Crossover Nanoparticles via Molecular Nanoengineering

Popis výsledku anglicky

The local entrapment of the spin crossover complex Fe(II)-tris[2-(2&apos;-pyridyl)benzimidazole] into the pluronic polymeric matrix (P123, PEG20-PPG70-PEG20, MW similar to 5800) yielded the formation of magnetic nanoparticles of similar to 26 nm (SCO-Np). Formation of SCO-Np was driven by the emergence of noncovalent interactions between the aromatic-NH group of the benzimidazole moieties present in Fe(II)-tris[2-(2&apos;-pyridyl)benzimidazole] with the aliphatic ether (-O-) groups of the pluronic polymeric matrix. The nanoparticles show spin crossover behavior, two-step spin bistability, and wide magnetic hysteresis, expressed in the temperature range of 170-280 K (Delta T-max = 38 K). The neat SCO molecules, Fe(II)-tris[2-(2&apos;-pyridyl)benzimidazole], on the contrary show only first-order spin transition and negligible hysteresis. The developed matrix-confinement approach of SCO molecules shown in this work yielded an unprecedented and significant improvement of the magnetic cooperativity compared to the neat spin crossover system, despite the decreased dimension of the magnetic domain in the nanosized architecture.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Chemistry of Materials

ISSN

0897-4756

e-ISSN

—

Svazek periodika

29

Číslo periodika v rámci svazku

20

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

8875-8883

Kód UT WoS článku

000413884900034

EID výsledku v databázi Scopus

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