Fluorescent dialdehyde ligand for the encapsulation of dinuclear luminescent lanthanide complexes

Abstract

Five dinuclear lanthanide complexes [Ln(III)(2)(hpd)(6)].solvent, Ln(III) = Eu(III) (1.2MeCN), Gd(III) (2.2MeCN), Tb(III) (3.MeCN.MeOH), Dy(III) (4.2MeCN), Ho(III) (5.2MeCN) and Hhpd (2-Hydroxyisophthaldehyde) were synthesised and structurally and magnetically characterised. X-Ray structural analysis shows all complexes are isostructural and crystallise in the triclinic P1 space group. The dinuclear complexes are composed of eight-coordinate lanthanide ions linked by two phenoxide bridges from two hpd(-) ligands. Complex 1 exhibits characteristic fluorescence in the visible region.

Construction and Magnetic Study of One‐Dimensional Lanthanide–Radical Chains Involving Pyridinone‐Substituted Nitronyl Nitroxide Radicals

“…The large Gd–O–N–C torsion angle (92.69° in 1 ) is favorable for charge transfer, resulting in ferromagnetic coupling . For the dinuclear Gd system, the observed weak antiferromagnetic coupling is consistent with the reported other dinuclear Gd 2 O 2 systems in the literature , …”

Dinuclear lanthanide complexes supported by a hybrid salicylaldiminato/calix[4]arene-ligand: synthesis, structure, and magnetic and luminescence properties of (HNEt3)[Ln2(HL)(L)] (Ln = SmIII, EuIII, GdIII, TbIII)

“…Such a weak antiferromagnetic coupling constant is a typical value for phenolato-bridged Gd III systems. 82,[84][85][86][87] The χ M T value of the Eu III 2 complex 5 is 2.80 cm 3 K mol −1 at 300 K, a value which is close to that expected for two non-interacting Eu III ions (2.65 cm 3 K mol −1 ), with non-negligible population of excited 7 F 1 -7 F 6 levels. The deviation from the Hund-Landé expectation value (0μ B ) is also attributable to contributions from the second order Zeeman effect in the ground 7 F 0 multiplet.…”

“…Upon cooling the χ M T values decrease first slowly to 22.71 cm 3 K mol −1 at 100 K and then more rapidly to 15.87 cm 3 K mol −1 at 4 K. Tb III complexes are known to exhibit significant magnetic anisotropy, and fitting of susceptibility data is therefore difficult. 84 The field dependence of the magnetization for complex 7 was determined in order to see whether magnetic anisotropy is present in this complex. Indeed, at 2 K the magnetization values increase rapidly at low fields and then linearly but without a clear saturation, reflecting the presence of a significant magnetic anisotropy ( Fig.…”

Variation of structural motifs in lanthanoid hydroxo clusters by ligand modification

“…This kind of 1,3,5 array is analogous to the diformylphenolato ligand that commonly serves to coordinate two lanthanide ions. 51,52 The phenyl species, 13H, was found to stabilise cationic tetranuclear clusters in a tetrahedral arrangement around a μ 4 -oxo core with the composition [Ln 4 (μ 2 -Cl) 2 (μ 4 -O)(13) 6 ]Cl 2 (Ln = Nd, Ho, Tb, Er) ( Figure 16).…”