Fondo Matilde, Corredoira-Vázquez Julio, Herrera-Lanzós Antía, García-Deibe Ana M, Sanmartín-Matalobos Jesús, Herrera Juan Manuel, Colacio Enrique, Nuñez Cristina
Departamento de Química Inorgánica, Facultade de Química, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, Avda. Fuentenueva s/n, 18071, Granada, Spain.
Dalton Trans. 2017 Dec 12;46(48):17000-17009. doi: 10.1039/c7dt03438e.
Mononuclear complexes of stoichiometry Ln(HL)(HO)(NO) (Ln = Tb, 1; Dy, 2, Er, 3), which crystallise with different solvates, and the heterotrinuclear compound [ZnDy(L)(NO)(OH)] (4) can be obtained with the same HL compartmental ligand. The single X-ray crystal structure of the mononuclear complexes shows a LnO core with a muffin-like disposition while the geometry of the DyO core in 4 seems to be closer to spherical capped square antiprism. The analysis of the magnetic properties of all the complexes demonstrates that the mononuclear lanthanide compounds do not show slow relaxation of the magnetization, even when the samples are diluted with a diamagnetic matrix and subjected to a dc applied field of 1000 Oe. Nevertheless, the heterotrinuclear dysprosium complex 4·3HO is a field-induced single ion magnet, with an estimated U barrier of 59 K. The luminescence characterisation of all the metal complexes in methanol solution at 298 K also shows a notable increase in the fluorescence emission of the heterotrinuclear complex with respect to the mononuclear ones, in such a way that 4 can be defined as a fluorescent single ion magnet.
