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Breaking Symmetry Relaxes Structural and Magnetic Restraints, Suppressing QTM in Enantiopure Butterfly Fe$_{2}$Dy$_{2}$ SMMs**

Baniodeh, Amer; Wagner, Danny; Peng, Yan; Kaemmerer, Hagen; Leblanc, Nicolas; Bräse, Stefan; Naubron, Jean‐Valére; Anson, Christopher E.; Powell, Annie K.

These 2 coordination clusters are similar but different both in the fine details of their structures as well as their magnetic behaviour. [Fe$_{2}$Dy$_{2}$(μ$_{3}$-OH)$_{2}$(Me-teaH)$_{2}$(O$_{2}$CPh)$_{6}$], which normally forms with the racemic version of Me-teaH3 by using enantiopure ligand, allows access to the S-version, but for the R-version there is significant racemisation. Surprisingly, by using the synthesis of [Fe$_{2}$Dy$_{2}$(μ$_{3}$-OH)$_{2}$(Me-teaH)$_{2}$(O$_{2}$CPh)$_{4}$(NO$_{3}$)$_{2}$] both enantiopure R- and S-compounds were obtained. In both cases breaking the symmetry of the parent compounds leads to enhanced SMM behaviour.

The {Fe$_{2}$Dy$_{2}$} butterfly systems can show single molecule magnet (SMM) behaviour, the nature of which depends on details of the electronic structure, as previously demonstrated for the [Fe$_{2}$Dy$_{2}$(μ$_{3}$-OH)$_{2}$(Me-teaH)$_{2}$(O$_{2}$CPh)$_{6}$] compound, where the [N,N-bis-(2-hydroxyethyl)-amino]-2-propanol (Me-teaH$_{3}$) ligand is usually used in its racemic form. Here, we describe the consequences for the SMM properties by using enantiopure versions of this ligand and present the first homochiral 3d/4 f SMM, which could only be obtained for the S enantiomer of the ligand for [Fe$_{2}$Dy$_{2}$(μ$_{3}$-OH)$_{2}$(Me-teaH)$_{2}$(O$_{2}$CPh)$_{6}$] since the R enantiomer underwent significant racemisation. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000140109
Veröffentlicht am 17.11.2021
DOI: 10.1002/chem.202103360
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Anorganische Chemie (AOC)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 11.2021
Sprache Englisch
Identifikator ISSN: 0947-6539, 1521-3765
KITopen-ID: 1000140109
Erschienen in Chemistry - a European journal
Verlag John Wiley and Sons
Band 27
Heft 61
Seiten 15103–15109
Vorab online veröffentlicht am 21.10.2021
Nachgewiesen in Web of Science
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