RT Journal Article
T1 Dy4, Dy5, and Ho2 Complexes of an N3O2 Aminophenol Donor: A Dy5-µ3-Peroxide Single Molecule Magnet
A1 Fondo Busto, María Matilde
A1 Corredoira Vázquez, Julio
A1 Oreiro-Martínez, Paula
A1 Nieto Pastoriza, Daniel
A1 García Deibe, Ana María
A1 Sanmartín Matalobos, Jesús
K1 Lanthanoid
K1 SMM
K1 Peroxide ligand
K1 N3O2 aminophenol
AB The reactivity of the new flexible potentially pentadentate N3O2 aminophenol ligand H4Lr (2,2 -((pyridine-2,6-diylbis(methylene))bis(azanediyl))diphenol) towards different dysprosium salts and holmium(III) nitrate was investigated. Accordingly, this reactivity seems to greatly depend on the metal ion and salt employed. In this way, the reaction of H4Lr with dysprosium(III) chloride in air leads to the oxo-bridged tetranuclear complex [Dy4(H2Lr)3(Cl)4(μ3-O)(EtOH)2(H2O)2]·2EtOH·H2O (1·2EtOH·H2O), while the same reaction just changing the chloride salt by the nitrate one renders the peroxo-bridged pentanuclear compound [Dy5(H2Lr)2(H2.5Lr)2(NO3)4(μ3-O2)2]·2H2O (2·2H2O), where both peroxo ligands seem to come from the fixation and reduction of atmospheric oxygen.However, if holmium(III) nitrate is used instead of dysprosium(III) nitrate, no evidence of a peroxide ligand is observed, and the dinuclear complex {[Ho2(H2Lr)(H3Lr)(NO3)2(H2O)2](NO3)} 2.5H2O (3·2.5H2O) is isolated. The three complexes were unequivocally characterized by X-ray diffraction techniques, and their magnetic properties were analyzed. Thus, while the Dy4 and Ho2 complexes do not show magnet-like behavior even in the presence of an external magnetic field, 2·2H2O is a single molecule magnet, with an Ueff barrier of 61.2 K (43.2 cm−1). This is the first homonuclear lanthanoid peroxide SMM, which also shows the highest barrier among the reported 4f/3d peroxide zero field SMMs to date.
PB MDPI
SN 1661-6596
YR 2023
FD 2023
LK http://hdl.handle.net/10347/32282
UL http://hdl.handle.net/10347/32282
LA eng
NO Corredoira-Vázquez, J., Oreiro-Martínez, P., Nieto-Pastoriza, D., García-Deibe, A.M., Sanmartín-Matalobos, J., Fondo Busto, M. (2023). Dy4, Dy5, and Ho2 Complexes of an N3O2 Aminophenol Donor: ADy5-μ3-Peroxide Single Molecule Magnet. “International Journal o f Molecular Sciences”, vol. 24, Issue 10, Article 9061
NO This research received no external funding. J.C.-V. Thanks Xunta de Galicia for his postdoctoral fellowship (ED481B-2022-068), and P.O.-M. thanks the Fundación Segundo Gil Dávila for her PhD grant.
DS Minerva
RD 28 abr 2026