Twisting Induces Ferromagnetism in Homometallic Clusters

Ghenadie Novitchi (1) , Sergi Vela , Guillaume Pilet (2) , Cyrille Train (1) , Vincent Robert (3)

1 LNCMI-G - Laboratoire national des champs magnétiques intenses - Grenoble
2 LMI - Laboratoire des Multimatériaux et Interfaces
3 Laboratoire de Chimie Quantique

A helical chiral cluster bridging two sets of Cu 2 units is reported. The two double-strand ligands induce a distorted tetrahedral environment for one of the two copper(II) ions whereas the second one remains in a standard octahedral environment. Magnetic measurements and wavefunction calculations demonstrate that the copper(II) centres are ferromagnetically coupled (J = 7.7 cm-1). This ligand-driven ferromagnetic interaction thus appears as a proof-of-concept of an innovative strategy towards high-spin clusters.

Domaines: Matériaux

Ghenadie Novitchi, Sergi Vela, Guillaume Pilet, Cyrille Train, Vincent Robert. Twisting Induces Ferromagnetism in Homometallic Clusters. Dalton Transactions, 2017, 46 (34), pp.11154-11158. ⟨10.1039/c7dt02360j⟩. ⟨hal-01593496⟩