Synthesis, structural characterization, and magnetic property study of {Cr 3 Ln 3 }, Ln = Gd and Dy complexes

MECCHIA ORTIZ, JUAN H.; PAREDES-GARCÍA, VERÓNICA; CRUZ, CARLOS; CABROSI, DAIANA; ALBORÉS, PABLO

DALTON TRANSACTIONS

ROYAL SOC CHEMISTRY

Año: 2022 vol. 51 p. 624 - 637

1477-9226

We have successfully prepared and structurally characterized triangle-in-triangle {Cr3Ln3} complexes with Ln = Gd and Dy employing alcohol-amine, N-methyldiethanolamine (H2mdea) and pivalate ligands. These complexes and the Yttrium analogue proved to be isostructural and crystallized in a P1 triclinic cell. DC and AC magnetic measurements were carried out and supported by quantum computations at DFT and CASSCF levels. DC magnetic data are dominated by the Cr(III)?Ln(III) antiferromagnetic interaction and by single-ion anisotropy in the case of the Dy(III) complex. Ln(III)?Ln(III) magnetic interactions are negli-gible, as well as Cr(III)?Cr(III) ones. From AC data, slow relaxation of the magnetization is observed at 0 DC applied magnetic field in the case of the Dy(III) complex below 4 K. From temperature and field depen-dence data, possible Raman and Orbach relaxation mechanisms are established in the absence of quantum tunnelling pathways, suggesting a successful suppression of the latter due to the Cr(III)?Dy(III) exchange interaction.