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Luminescence thermometry in a Dy4 single molecule magnet
Julio Corredoira-Vázquez1,2, Cristina González-Barreira1, Matilde Fondo1
1Departamento de Química Inorgánica, Facultade de Química, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain. matilde.fondo@usc.es.
Abstract:
The tetranuclear linear complex [Dy4(1,1,4-H3Lr)2(OAc)6]·CH3OH (1·CH3OH) was satisfactorily prepared and characterized. Its X-ray structure shows that it contains two types of octacoordinated DyIII 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·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·CH3OH is the first Dy4 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 DyIII emission.
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