Single-molecule magnet behavior in heterolopetic Dy 3+ -chloro-diazabutadiene complexes: influence of the nuclearity and ligand redox state

Jérome Long (1) , Aleksei Tolpygin , Anton Cherkasov (2) , Konstantin A. Lyssenko (3) , Yannick Guari (1) , Joulia Larionova (1) , Alexander Trifonov (2)

1 ICGM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
2 Russian Acad Sci, GA Razunaev Inst Organomet Chem
3 INEOS - A. N. Nesmeyanov Institute of Organoelement Compounds

We report the synthesis, structure and magnetic properties' investigations of a series of new dysprosium heteroleptic mono-and dinuclear complexes based on the association of chloride and different diazabutadiene (DAD 2R = [2,6-iPr2C6H3N-CRCR-NC6H3iPr2-2,6]; R = H, Me) ligands showing different redox states. While using dianionic DAD 2R ligands affords the formation of dichloro-bridged dinuclear complexes [Dy2(DAD 2R)(-Cl)2(THF)2] (R = H (1), Me (2)), two different mononuclear complexes of general formula [DyCl2(DAD 2R)(THF)2] (R = H (3), Me (4)) could be obtained with either a radical monoanionic and a monoanionic DAD 2R state, respectively. Remarkably, all the complexes exhibit a slow relaxation of their magnetization where the relaxation dynamics depends on both, the nuclearity of the system and the DAD 2R redox state.

Domaines: Chimie de coordination

Jérome Long, Aleksei Tolpygin, Anton Cherkasov, Konstantin A. Lyssenko, Yannick Guari, et al.. Single-molecule magnet behavior in heterolopetic Dy 3+ -chloro-diazabutadiene complexes: influence of the nuclearity and ligand redox state. Dalton Transactions, 2020, 49 (34), pp.11890-11901. ⟨10.1039/D0DT02305A⟩. ⟨hal-02927056⟩