Abstract
The two mononuclear complexes of the formula [Dy(tta)3(L)] (1) and [Dy(hfac)3(L)] (2) (where tta- = 2-thenoytrifluoroacetylacetonate and hfac- = 1,1,1,5,5,5-hexafluoroacetylacetonate) were obtained from the coordination reaction of the Dy(tta)3·2H2O or Dy(hfac)3·2H2O units with the 1,10-phenantroline-5,6-dione ligand (L). Their structures have been determined by X-ray diffraction studies on single crystals, and they revealed a supramolecular assembly of tetramers through σ-π interactions. Both complexes displayed a Single-Molecule Magnet (SMM) behavior without an external applied magnetic field. Magnetic relaxation happened through Orbach, Raman and Quantum Tunneling of the Magnetization (QTM). Wavefunction theory calculations were realized to rationalize the magnetic properties.
Highlights
The design of lanthanide coordination complexes is crucial for the development of emitting materials [1,2] and molecular magnetism fields [3,4,5]
The strong magnetic anisotropy associated with a high magnetic moment makes lanthanide ions suitable for the observation of Single-Molecule Magnet (SMM) behavior [15]
The Dy(tta)3 unit is linked to the 1,10-phenantroline-5,6-dione ligand (L) through the nitrogen bidentate coordination site and to three tta- ancillary ligands (Figure 1a)
Summary
The design of lanthanide coordination complexes is crucial for the development of emitting materials [1,2] and molecular magnetism fields [3,4,5]. The strong magnetic anisotropy associated with a high magnetic moment makes lanthanide ions suitable for the observation of Single-Molecule Magnet (SMM) behavior [15]. Such magnetic bistability could find interest in potential applications such as high density storage devices [16], quantum computing [17] or spintronics [18]. The use of cyclopentadienyl-based ligands has allowed for the design of mononuclear lanthanide SMMs with a high blocking temperature [20,21,22,23] These two research fields highlight the important role of the organic ligands associated to the lanthanide ion
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