Empirical intensity parameters for the 4f .fwdarw. 4f absorption spectra of nine-coordinate erbium(III) complexes in aqueous solution

Abstract

The Judd-Ofelt parametrization scheme for lanthanide 4f -» 4f transition intensities is used to analyze absorption intensity data obtained for a series of Er(III) complexes in aqueous solution. Oscillator strengths are reported for eight multiplet-to-multiplet transition regions of each complex, and values for the Judd-Ofelt intensity parameters, ( = 2,4, 6), are determined and reported for each of the systems. Variations in the values of these parameters from system to system are discussed in terms of structural differences between the complexes (with respect to ligand properties and coordination geometry).

Photophysical Properties and Energy Transfer Pathway of Er(III) Complexes with Pt−Porphyrin and Terpyridine Ligands

“… a Ω 2,4,6 = 2 × 10 -20 cm -1 from ref . b The backward transfer rates were calculated by multiplying the forward rates by the Boltzmann factors at room temperature. …”

Bimetallic isopropoxides M[Al(OC3Hi7)4]3 (M = Pr, Nd)—catalyzed reduction of 2-octanone and benzophenone

“…Devlin et al [35][36][37] have reported, while minutely observing quantitatively the intensity data of 4f -4f transitions of structurally related lanthanide complexes in solution, that small changes in structural or functional groups induce significantly the intensity of all the bands, which in turn reflect a noticeable difference in the oscillator strengths as well as in the intensity ( λ , T λ , or Ω λ ) parameters. We have also made similar observations during the spectral intensity data analysis for a number of complexes of varying structural features, binding abilities, and different compositional and conformational characteristics in solution and shown that minor changes due to these characteristics are accompanied by significant variation in the oscillator strength of different 4f -4f bands as well as remarkable variations in Judd-Ofelt (T λ ) parameters [38][39][40][41][42][43][44].…”