Counterintuitive Single-Molecule Magnet Behaviour in Two Polymorphs of One-Dimensional Compounds Involving Chiral BINOL-Derived Bisphosphate Ligands
Résumé
The coordination reaction of the [Dy(hfac)(3)(H2O)(2)] units (hfac(-) = 1,1,1,5,5,5-hexafluoroacetylacetonate) with the [8 and PRIME;-(Diphenoxylphosphinyl)[1,1 and PRIME;-binaphthalen]-8-yl]diphenoxylphosphine oxide ligand (L) followed by a crystallisation in a 1:3 CH2Cl2:n-hexane solvent mixture led to the isolation of a new polymorph of formula [(Dy(hfac)(3)((S)-L))(3)](n) (1). The X-ray structure on single crystal of 1 revealed the formation of a mono-dimensional coordination polymer with three crystallographically independent Dy-III centres, which crystallised in the polar chiral P2(1) space group. Ac magnetic measurements highlighted single-molecule magnet behaviour under both zero and 1000 Oe applied magnetic field with magnetic relaxation through quantum tunneling of the magnetisation (QTM, zero field only) and Raman processes. Despite the three crystallographically independent Dy-III centres adopting a distorted D-4d coordination environment, a single slow magnetic relaxation contribution was observed at a slower rate than its previously studied [(Dy(hfac)(3)((S)-L))](n) (2) polymorph.
Domaines
Chimie
Fichier principal
Mattei et al. - 2021 - Counterintuitive Single-Molecule Magnet Behaviour .pdf (2.15 Mo)
Télécharger le fichier
Origine | Fichiers éditeurs autorisés sur une archive ouverte |
---|