On correlating the frequency of the 7F0 → 5D0 transition in Eu3+ complexes with the sum of ‘nephelauxetic parameters’ for all of the coordinating atoms

Interpretation of europium(III) spectra

“…The relationship more or less holds for ligands in which most of the donor atoms are negatively charged, but there are many violations of this relationship for complexes with neutral ligands. Later, it was suggested that the observed wavenumber shifts are better correlated to the sum of the partial charges on the ligand atoms than to the total formal charge [554], but also deviations from this correlation were found [721]. Moreover it is very difficult to determine accurate values of these partial charges.…”

Lanthanopolyoxotungstates in silica nanoparticles: multi-wavelength photoluminescent core/shell materials

“…To perform this analysis we will focus in the energy of the non-degenerated 5 D 0 / 7 F 0 transition, since this transition is usually related with the covalency degree of the Eu-O bonds. [35][36][37] The energy (E 00 ) and fwhm (fwhm 00 ) of the 5 D 0 / 7 F 0 transition were estimated using a single Gaussian fit to the emission spectra. For 1 under direct intra-4f 6 excitation (465 nm) and via LMCT states (330 nm) the fit yielded to E 00 /fwhm 00 values of 17 215.6 AE 0.1/36.3 AE 0.2 cm À1 and 17 230.4 AE 0.1/ 37.7 AE 0.3 cm À1 , respectively.…”

The First Self‐Assembled Trimetallic Lanthanide Helicates Driven by Positive Cooperativity

“…The value of B 2 0 is still negative for site II, [3,46] but the separation between the A 2 and E (barycenter) sublevels (DE AÀE 134 cm À1 ) is significantly larger than that observed for site I (75 cm À1 ); this implies a larger B 2 0 parameter for site II. Although the nephelauxetic effects produced by the EuN 9 and EuN 6 O 3 environments are very similar [22,33,53] and cannot be used for unambiguously assigning site I and site II (we calculate energies of 17 236 and 17 233 cm À1 for the 7 F 0 3 5 D 0 transitions of EuN 9 and EuN 6 O 3 , respectively, at 295 K), [22,33] the faint emission intensity of site II matches the one previously reported for [Eu(L9) 3 ] 3 ; [32] hence, we can safely ascribe it to the central EuN 9 site. The negative signs of B 2 central 0 and B 2 terminal 0 agree with axial coordinates q i for the donor atoms that occupy the vertices of the trigonal prisms larger than 458 (Tables S5 ± S7 in the Supporting Information), [3,46] but the order j B j .…”