Increased Antenna Effect of the Lanthanide Complexes by Control of a Number of Terdentate N-Donor Pyridine Ligands

Abstract

Three europium complexes with the terdentate N-donor ligand 2,6-bis(1H-pyrazol-3-yl)pyridine (L) have been synthesized, and their crystal structures have been determined. The ligand/metal ratios in these complexes are 3, 2, and 1. The photophysical properties of the complexes indicate more efficient ligand sensitization of europium emission for the homoleptic complex.

‘Lanthanide contraction’ in [Ln(BTP)3](CF3SO3)3 complexes

“…complex cations are in good agreement with literature reports on BTP [28], BTP derivative complexes [7,29,30] or complexes with comparable structural motifs arising from ligands which are related to BTP in terms of symmetry and coordination behaviour [5,[31][32][33][34][35][36][37][38][39][40][41][42]. Selected geometrical parameters from our (La, Pr, Nd, Eu) and literature (Sm, Tm, Yb) [28] X-ray studies and from our computations are compared in Table 2.…”

Four unexpected lanthanide coordination polymers involving in situ reaction of solvent N, N-Dimethylformamide

“…The average bond length of Eu-N is 2.525(3) Å and the Eu-O bond lengths fall in the range 2.357(2) À 2.431(3) Å. The Eu-N bond length is in agreement with those reported in other Eu(III) complexes[14][15][16][17][18][19].…”

Luminescent Lanthanide Nanomaterials: An Emerging Tool for Theranostic Applications

“…In some chelates, ligands themselves act as sensitizers. Several properties such as the binding strength of the ligand and UV absorption properties are critical in choosing the right ligand based on the application of the lanthanide chelates [8]. Ligands such as polyaminocaroxylates, β-diketonates, phenanthrolines, acetylene derivatives, salicylic acids, biphenyls, pyridine, pyrimidine and pyrazine derivatives, bi-and ter-pyridyl and quinolone have been studied extensively to synthesize highly stable lanthanide complexes with high quantum yield for biological applications [9,10]'.…”