Cerium(III) and 5-methylisophthalate-based MOFs with slow relaxation of magnetization and photoluminescence emission Pajuelo Corral, Oier Contreras, M. Carmen Rojas Macías, Sara Choquesillo Lazarte, Duane José M. Seco, José M. Rodríguez Diéguez, Antonio Salinas-Castillo, Alfonso Cepeda, Javier Zabala-Lekuona, Andoni Zabala-Lekuona Vitorica-Yrezabal, Iñigo J. Two novel Ce(III) metal organic frameworks (MOFs) with formulas [Ce(5Meip)(H-5Meip)]nGR-MOF-17 and [CeCl(5Meip)(DMF)]nGR-MOF-18 (5Meip = 5-methylisophthalate, DMF = N,N-dimethylformamide) have been synthesized, forming 3-dimensional frameworks. Magnetic measurements show that both compounds present field-induced slow magnetic relaxation under a small applied dc field. For GR-MOF-17, the temperature dependence of relaxation times is best described by a Raman mechanism, whereas for GR-MOF-18, relaxation occurs through a combination of Raman and local-mode pathways. Moreover, when avoiding short Ce⋯Ce interactions by magnetic dilution in GR-MOF-17@La and GR-MOF-18@La, only the local-mode mechanism is responsible for magnetic relaxation. Photophysical studies show the occurrence of ligand-centred luminescence in both compounds and phosphorescence emission at low temperature for GR-MOF-17. 2024-07-29T10:39:09Z 2024-07-29T10:39:09Z 2024-06-14 journal article Pajuelo Corral, O. et. al. Dalton Trans., 2024, 53, 11750–11761. [https://doi.org/10.1039/d4dt00401a] https://hdl.handle.net/10481/93569 10.1039/d4dt00401a eng http://creativecommons.org/licenses/by-nc/4.0/ open access Atribución-NoComercial 4.0 Internacional Royal Society of Chemistry