Self-Assembly of a Trinuclear Luminescent Europium Complex

Understanding the speciation of Ln(iii) complexes with octadentate tripodal ligands

Thorough speciation studies of Ln(iii) complexes with new dissymmetrical tripodal ligands were undertaken, which reveal the preferential formation of unsaturated dinuclear helicates.

Pyrazine-imide complexes: reversible redox and MOF building blocks

Stepwise exchange of pyrazine for pyridine, in three bis-heterocycle-based imide ligands, tunes the potential of the [M^II/III(ligand)₂]^0/+ redox couple, increasing the stability of the M^II oxidation state by about 0.1 V per exchange.

Sm and Eu(iii) lanthanide triple helicate cages based on N,N′-methylene-bis(pyridin-4-one)

Sm and Eu(iii) lanthanide triple helicate cages have two distinct metal environments, with the Sm(iii) complex exhibiting homochirality and an increase in sensitization.

Metal-controlled diastereoselective self-assembly and circularly polarized luminescence of a chiral heptanuclear europium wheel

The chiral dissymmetric tetradentate ligand (S)-6'-(4-phenyloxazolin-2-yl)-2,2'-bipyridine-6-carboxylate (S-Phbipox) leads to the diastereoselective assembly of a homochiral Eu(3+) triangle and a highly emissive (quantum yield = 27%) heptanuclear wheel that is the largest example of a chiral luminescent complex of Eu(3+) reported to date. The nuclearity of the assembly is controlled by the solvent and the Eu(3+) cation. All of the compounds show large circularly polarized luminescence with an activity that varies with the nature of the assembly (highest for the homochiral trimer).

Tris(6-carb-oxy-pyridine-2-carboxyl-ato)terbium(III) 2.75-hydrate

In the title compound, [Tb(C₇H₄NO₄)₃]·2.75H₂O, the Tb³⁺ atom is coordinated by three tridentate 6-carb­oxy­pyridine-2-carboxyl­ate ligands and lies on a crystallographic threefold rotation axis. The coordination polyhedron around Tb^III adopts a distorted tricapped trigonal–prismatic geometry. Disordered water mol­ecules with partial occupancy are also present in the crystal, one of which is associated with each of the carboxyl­ate O atoms of the complex unit.

Rational design of a ternary supramolecular system: self-assembly of pentanuclear lanthanide helicates

The self-assembly of the first pentanuclear helicate was predicted on the structural basis obtained for linear and tetranuclear parent supramolecular compounds. Accordingly, the designed ternary supramolecular system requires appropriate polytopic organic receptors, which were successfully synthesized. Indeed, the formation of pentanuclear complexes was experimentally evidenced with NMR and ESMS spectra that perfectly reflect the expected pattern. The structural features in the europium pentanuclear complex are highlighted with semiempirical molecular modeling. The present work validates the combinatorial approach leading to the thermodynamically driven formation of tower-like pentanuclear edifices.