Abstract
The complex [Dy(L)(tta)3] with L the chiral 3-(2-pyridyl)-4-aza[6]-helicene ligand (tta− = 2-thenoyltrifluoroaacetonate) has been synthesized in its racemic form and structurally and magnetically characterized. [Dy(L)(tta)3] behaves as a single molecule magnet in its crystalline phase with the opening of a hysteresis loop at 0.50 K. These magnetic properties were interpreted with ab initio calculations.
Highlights
The design of single molecule magnet (SMM), with the aim of enhancing its peculiar magnetic properties, has been a prolific field in the scientific community for decades [1,2,3]
The N2O6 coordination polyhedron can be described as a distorted square antiprism environment (D4d symmetry on the basis of SHAPE analysis, Table S2) [41]
In the course of intermixing chirality offered by the nature of the ligands and SMM properties, we extend the family of [6]-helicene-based lanthanide SMM [27]
Summary
The design of single molecule magnet (SMM), with the aim of enhancing its peculiar magnetic properties, has been a prolific field in the scientific community for decades [1,2,3]. Lanthanides have been intensively studied for their peculiar luminescence that covers a broad range of frequencies (from visible to near IR) with sharp line shape emission bands and long lifetime of the excited states [16,17,18,19,20,21,22]. They show very low absorption coefficients, since the f–f transitions are prohibited (Laporte rule) [23]. We report the synthesis, the single crystal X-ray structural analysis and the magnetic characterization along with extensive ab initio calculations of the novel compound [Dy(L)(tta)3] (1)
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