Fondo Busto, María MatildeCorredoira Vázquez, JulioOreiro-Martínez, PaulaNieto Pastoriza, DanielGarcía Deibe, Ana MaríaSanmartín Matalobos, Jesús2024-02-052024-02-052023Corredoira-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 90611661-6596http://hdl.handle.net/10347/32282The 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.engThis article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).http://creativecommons.org/licenses/by-nc-nd/4.0/LanthanoidSMMPeroxide ligandN3O2 aminophenol2303 Química inorgánicajournal article10.3390/ijms241090611422-0067open access