Structures, luminescence and vibrational spectroscopy of europium and terbium nitro- and dinitro-substituted benzoates. Nitro groups as quenchers of Ln3+ luminescence

Charge transfer adducts of binuclear rare earth 3,5-dinitrobenzoates with N,N-dimethylaniline and toluene

“…Furthermore, excitation spectra (250-410 nm) were obtained for 1 and 6 at λ reg = 450 nm. They appear as broad bands with maxima at 343 and 335 nm (Fig.6), respectively, which agrees satisfactorily with the results in [21,22]. However, some differences in the 350-410 nm region are observed for complexes 1 and 6.…”

“…A detailed study of the effect of the presence of electron-acceptor nitro groups in the aromatic ring of the ligand on the Eu 3+ luminescence efficiency was carried out earlier [21]. The excitation spectra of compounds 1 and 6 at λ reg = 615 nm that we obtained (Fig.…”

Luminescence Enhancement by p‐Substituent Variation

“…The luminescence quantum yield decreases 2–30 times for europium and terbium compounds upon the introduction of the NH 2 group. This enables us to suggest that this group is a “bad” group – a universal quencher for lanthanide luminescence together with the NO 2 group , . As another “bad” substituent, we suggest the azido group, since none of the Ln(paz) 3 (H 2 O) 2 (Ln = Eu, Gd, Tb, Lu) complexes exhibit luminescence (Table ).…”

Eu(III) and Tb(III) Complexes with the Nonsteroidal Anti-Inflammatory Drug Carprofen: Synthesis, Crystal Structure, and Photophysical Properties

“…The coordination polyhedron around the central Eu 3+ can be described as a distorted trigonal dodecahedron (see Supporting Information Figure S3(a)) formed by one chelating carboxyl, two bidentate bridging ones, two tridentate bridging ones, and one DMF molecule. At the same time, the geometry of the Eu(1) atom can also be stated as a distorted square antiprism as shown in Supporting Information Figure S3 33.2220 (17) …”