- آخرین فایل ها
- پرفروشترین فایل ها
- پربازدیدترین فایل ها
Characterization of lanthanoid complexes via the combined use of gas-phase photoluminescence measurements using mass-spectrometric techniques, density functional theory computations, and ligand-field theory.
Gas-phase photoluminescence measurements involving mass-spectrometric techniques enable determination of the properties of selected molecular systems with knowledge of their exact composition and unaffected by matrix effects such as solvent interactions or crystal packing. The resulting reduced complexity facilitates a comparison with theory. Herein, we provide a detailed report of the intrinsic luminescence properties of nonanuclear europium(III) and gadolinium(III) 9-hydroxyphenalen-1-one (HPLN) hydroxo complexes. Luminescence spectra of [Eu9(PLN)16(OH)10]+ ions reveal an europium-centered emission dominated by a 4-fold split EuIII hypersensitive transition, while photoluminescence lifetime measurements for both complexes support an efficient europium sensitization via a PLN-centered triplet-state manifold. The combination of gas-phase measurements with density functional theory computations and ligand-field theory is used to discuss the antiprismatic core structure of the complexes and to shed light on the energy-transfer mechanism. This methodology is also employed to fit a new set of parameters, which improves the accuracy of ligand-field computations of EuIII electronic transitions for gas-phase species.
|حجم فایل||2,45 KB|