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

Result code in 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>
Result on the web
<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>

Result language
angličtina
Original language name
Triggering Two-Step Spin Bistability and Large Hysteresis in Spin Crossover Nanoparticles via Molecular Nanoengineering
Original language description
The local entrapment of the spin crossover complex Fe(II)-tris[2-(2'-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'-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'-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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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