Using N-Heterocyclic Carbenes as Weak Equatorial Ligands to Design Single-Molecule Magnets: Zero-Field Slow Relaxation in Two Octahedral Dysprosium(III) Complexes

Jérôme Long; Dmitry M Lyubov; Galina A Gurina; Yulia V Nelyubina; Fabrice Salles; Yannick Guari; Joulia Larionova; Alexander A Trifonov

doi:10.1021/acs.inorgchem.1c03429

Using N-Heterocyclic Carbenes as Weak Equatorial Ligands to Design Single-Molecule Magnets: Zero-Field Slow Relaxation in Two Octahedral Dysprosium(III) Complexes

Inorg Chem. 2022 Jan 24;61(3):1264-1269. doi: 10.1021/acs.inorgchem.1c03429. Epub 2022 Jan 7.

Authors

Jérôme Long^{1

2}, Dmitry M Lyubov^{3

4}, Galina A Gurina⁴, Yulia V Nelyubina³, Fabrice Salles¹, Yannick Guari¹, Joulia Larionova¹, Alexander A Trifonov^{3

4}

Affiliations

¹ ICGM, Univ. Montpellier, CNRS, ENSCM, 34095 Montpellier, France.
² Institut Universitaire de France, 1 rue Descartes, 75231 Paris Cedex 05, France.
³ Nesmeyanov Institute of Organoelement Compounds (INEOS), Russian Academy of Sciences (RAS), 28 Vavilova str., 119334 Moscow, Russia.
⁴ Institute of Organometallic Chemistry, Russian Academy of Sciences (RAS), 49 Tropinina str., GSP-445, 630950 Nizhny, Novgorod, Russia.

PMID: 34994542
DOI: 10.1021/acs.inorgchem.1c03429

Abstract

We report the synthesis, structures, and magnetic investigations of two new octahedral dysprosium complexes, based on the original N-heterocyclic carbene (NHC) tridentate bis(phenoxide) ligand, of the respective formulas mer-[DyL(THF)₂Cl] (1) and mer-[DyL(THF)₃][BPh₄] (2), where L = 1,3-bis(3,5-di-tert-butyl-2-oxidophenyl)-5,5-dimethyl-3,4,5,6-tetrahydropyrimidin-1-ium chloride and THF = tetrahydrofuran. The short Dy-O distances in the axial direction in association with the weak donor ability of the NHC moiety provide a suitable environment for slow relaxation of magnetization, overcoming the previous single-molecule magnets based on NHC ligands.