Ligand Modulation of the Structures and Magnetic Relaxation in Triangular Dy3 Complexes Based on a Tricompartmental Scaffold.
Chemistry
; 29(24): e202203494, 2023 Apr 25.
Article
en En
| MEDLINE
| ID: mdl-36645730
ABSTRACT
Using a novel tricompartmental hydrazone ligand, a set of trinuclear Dy3 complexes has been isolated and structurally characterized. Complexes Dy3 â
Cl, Dy3 â
Br, and Dy3 â
ClO4 feature a similar overall topology but different anions (Cl- , Br- , or ClO4 - ) in combination with exogenous OH- and solvent co-ligands, which is found to translate into very different magnetic properties. Complex Dy3 â
Cl shows a double relaxation process with fast quantum tunneling of the magnetization, probably related to the structural disorder of µ2 -OH- and µ2 -Cl- co-ligands. Relaxation of the magnetization is slowed down for Dy3 â
Br and Dy3 â
ClO4 , which do not show any structural disorder. In particular, fast quantum tunneling is suppressed in case of Dy3 â
ClO4 , resulting in an energy barrier of 341â
K and magnetic hysteresis up to 3.5â
K; this makes Dy3 â
ClO4 one of the most robust air-stable trinuclear SMMs. Magneto-structural relationships of the three complexes are analyzed and rationalized with the help of CASSCF/RASSI-SO calculations.
Texto completo:
1
Banco de datos:
MEDLINE
Idioma:
En
Año:
2023
Tipo del documento:
Article