Charge transfer excited states sensitization of lanthanide emitting from the visible to the near-infra-red

Slow Magnetic Relaxation in Unprecedented Mono-Dimensional Coordination Polymer of Ytterbium Involving Tetrathiafulvalene-Dicarboxylate Linker

“…Basically, the absorption spectrum of Yb in solid-state can be described as the addition of the absorption spectra of Na 2 L and H 2 L ( Figure S6). No emission of the Yb III ion was detected under irradiation on the ILCT band due to the presence of water molecules coordinated to the metal ion that are known to quench the luminescence [30]. χMT vs. T (with χM the molar magnetic susceptibility and T the temperature in Kelvin) decreases monotonically on cooling from 2.40 cm 3 •K•mol −1 at room temperature down to 0.99 cm 3 •K•mol −1 at 2 K due to the thermal population of crystal field levels within the ground state multiplet 2 F7/2 ( Figure S8).…”

“…Basically, the absorption spectrum of Yb in solid-state can be described as the addition of the absorption spectra of Na2L and H2L ( Figure S6). No emission of the Yb III ion was detected under irradiation on the ILCT band due to the presence of water molecules coordinated to the metal ion that are known to quench the luminescence [30]. The coordination polyhedron of the Yb III can be described as a distorted square antiprism.…”

Luminescence and Single‐Molecule‐Magnet Behaviour in Lanthanide Coordination Complexes Involving Benzothiazole‐Based Tetrathiafulvalene Ligands

“…As already observed for previously reported TTF-based complexes of Yb III , the antenna-effect sensitization process is favoured over direct f-f excitation and proceeds through energy transfer from the singlet CT state of the L 1 chromophore. [23,[49][50][51] Eight emission maxima and shoulders are clearly identified at ν = 9629, 9657, 9756, 9780, 9838, 9867, 9896 and 10220 cm -1 ( Figure 9b). This number of contributions is higher than the degeneracy of the 2 F 7/2 ground state (Kramers doublets, maximum of four contributions).…”

Slow Magnetic Relaxation in Chiral Helicene-Based Coordination Complex of Dysprosium

“…The versatility of ligand chemistry can be exploited in this sense and may offer the possibility to have in a single compound, for instance, a magnetic emitting nanodevice [13][14][15]. Indeed, 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]. However, they show very low absorption coefficients, since the f-f transitions are indeed prohibited (Laporte rule) [23].…”