Rational Improvement of Single-Molecule Magnets by Enforcing Ferromagnetic Interactions.

Venne J-P, Feldscher B, Walleck S, Stammler A, Bögge H, Schnack J, Glaser T (2019)
Chemistry 25(19): 4992-5004.

Download
Es wurde kein Volltext hochgeladen. Nur Publikationsnachweis!
Zeitschriftenaufsatz | Veröffentlicht | Englisch
Abstract / Bemerkung
The anisotropy barrier of polynuclear single-molecule magnets is expected to be higher with less tunneling the better stabilized the spin ground state is so that less MS mixing in the ground state and with excited spin states occur. We have realized this experimentally in two structurally related heptanuclear SMMs: the triplesalen-based [MnIII 6 CrIII ]3+ and the triplesalalen-based *[MnIII 6 CrIII ]3+ . The ligand system triplesalen was developed to enforce ferromagnetic interactions by the spin-polarization mechanism. However, we found weak antiferromagnetic couplings, that we assigned to an inefficient spin-polarization by a heteroradialene formation. To prevent this heteroradialene formation, the triplesalalen ligand H6 talalen t Bu 2 was designed. Here, we present the building block [(talalen t Bu 2 )MnIII 3 ]3+ and its application for the assembly of [{(talalen t Bu 2 )MnIII 3 }2 {CrIII (CN)6 }]3+ (=*[MnIII 6 CrIII ]3+ ). Both the trinuclear and heptanuclear complexes are SMMs. The comparison to the related triplesalen complex [(feld t Bu 2 )MnIII 3 ]3+ proves the absence of heteroradialene character and the enforcement of ferromagnetic MnIII -MnIII interactions in the (talalen t Bu 2 )6- complexes. This results in an increase of the barrier for spin reversal Ueff from 25 K in the triplesalen-based [MnIII 6 CrIII ]3+ SMMs to 37 K in the triplesalalen-based *[MnIII 6 CrIII ]3+ SMM proving the success of our concept. Based on this study, the next step in the rational improvement of our SMMs is discussed. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Erscheinungsjahr
Zeitschriftentitel
Chemistry
Band
25
Ausgabe
19
Seite(n)
4992-5004
eISBN
PUB-ID

Zitieren

Venne J-P, Feldscher B, Walleck S, et al. Rational Improvement of Single-Molecule Magnets by Enforcing Ferromagnetic Interactions. Chemistry . 2019;25(19):4992-5004.
Venne, J. - P., Feldscher, B., Walleck, S., Stammler, A., Bögge, H., Schnack, J., & Glaser, T. (2019). Rational Improvement of Single-Molecule Magnets by Enforcing Ferromagnetic Interactions. Chemistry , 25(19), 4992-5004. doi:10.1002/chem.201805543
Venne, J. - P., Feldscher, B., Walleck, S., Stammler, A., Bögge, H., Schnack, J., and Glaser, T. (2019). Rational Improvement of Single-Molecule Magnets by Enforcing Ferromagnetic Interactions. Chemistry 25, 4992-5004.
Venne, J.-P., et al., 2019. Rational Improvement of Single-Molecule Magnets by Enforcing Ferromagnetic Interactions. Chemistry , 25(19), p 4992-5004.
J.-P. Venne, et al., “Rational Improvement of Single-Molecule Magnets by Enforcing Ferromagnetic Interactions.”, Chemistry , vol. 25, 2019, pp. 4992-5004.
Venne, J.-P., Feldscher, B., Walleck, S., Stammler, A., Bögge, H., Schnack, J., Glaser, T.: Rational Improvement of Single-Molecule Magnets by Enforcing Ferromagnetic Interactions. Chemistry . 25, 4992-5004 (2019).
Venne, Jan-Philipp, Feldscher, Bastian, Walleck, Stephan, Stammler, Anja, Bögge, Hartmut, Schnack, Jürgen, and Glaser, Thorsten. “Rational Improvement of Single-Molecule Magnets by Enforcing Ferromagnetic Interactions.”. Chemistry 25.19 (2019): 4992-5004.

Export

Markieren/ Markierung löschen
Markierte Publikationen

Open Data PUB

Web of Science

Dieser Datensatz im Web of Science®

Quellen

PMID: 30860288
PubMed | Europe PMC

Suchen in

Google Scholar