Luminescence thermometry in a Dy-4 single molecule magnet


The tetranuclear linear complex [Dy-4(1,1,4-H3L')(2)(OAc)(6)]center dot CH3OH (1 center dot CH3OH) was satisfactorily prepared and characterized. Its X-ray structure shows that it contains two types of octacoordinated Dy-III ions, with distorted triangular dodecahedral and square antiprism geometries. This complex is an SMM, with multiple relaxation pathways, and with an anisotropic energy barrier of 39.7 K. 1 center dot CH3OH also operates as a luminescent thermometer in the 11-295 K range, with a maximum relative thermal sensitivity of 1.6% K-1 and a minimum temperature uncertainty of 1.1 K at 295 K. Thus, 1 center dot CH3OH is the first Dy-4 SMM with luminescent thermometry, and this system is a rare example of dysprosium SMM that accesses the thermometric characteristics involving the ligand ascribed to the triplet emission in combination with Dy-III emission.






Corredoira-Vazquez, J; Gonzalez-Barreira, C; Fondo, M; Garcia-Deibe, AM; Sanmartin-Matalobos, J; Hernandez-Rodriguez, MA; Carlos, LD

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Authors thank the Spanish Ministerio de Innovacion, Ciencia y Universidades (PGC2018102052-B-C21), and Xunta de Galicia for financial support. J. C.-V. also thanks Xunta de Galicia for his postdoctoral fellowship (ED481B-2022-068). This work was also developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020, financed by Portuguese funds through the FCT/MEC (PIDDAC).

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