Direct determination of traces of lanthanide ions in aqueous solutions by laser-induced time-resolved spectrofluorimetry

Chemiluminescence characterisation of the reaction system Tb(III)–amino acid–peroxynitrous acid

“…Measurements were made of its excited-state lifetime (τ), and luminescence studies were made of its solutions containing the amino acids in 0.2 mol/l sulfuric acid. In the case of europium(III) sulfate, the lifetime was τ = 134 s which indicates the formation of the complex [Eu(H 2 O) 7 (SO 4 )] + , studied previously by Tanaka and Yamashita [13] and Berthoud et al [14]. The same value for the lifetime of the excited state (τ = 134 s) was obtained in 0.2 mol/l H 2 SO 4 solutions containing the amino acids under study.…”

Strong luminescence of rare earth compounds in ionic liquids: Luminescent properties of lanthanide(III) iodides in the ionic liquid 1-dodecyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide

“…The experimental luminescence liftetime for Dy 3+ was determined to be 63 s. This value is quite high-even for Dy 3+ . In aqueous solutions, typically values between 9 s and 11 s are found (depending on the counterion) [26][27][28][29], and even in D 2 O the decay times are no longer than 43-139 s. In aqueous solutions, the luminescence of photo-excited trivalent lanthanide cations is quenched dominantly by O H vibrations of water molecules in the inner sphere of Ln(III). From this, it can be concluded that the anions present in solution, namely iodide and bis(trifluoromethanesulfonyl)imide prevent non-radiative energy transfer processes.…”

TRLIFS study of Eu(III) spectroscopic properties to obtain structural and thermodynamic informations on lanthanide-malonamide complexes in the Eu(III)/NaNO3/TetraEthylMalonAmide system

“…Time-Resolved Laser-Induced Fluorescence Spectroscopy (TRLIFS) was initially developed for uranium(VI) determination at low levels in complex mixtures due to its selectivity (λ excitation , λ emission and temporal discrimination) and sensitivity (Limit of Detection close to 10 −12 mol L −1 ) [5][6][7], and has already shown its usefulness for the speciation of uranium(VI), curium(III) and europium(III) [8][9][10][11]. With fluorescent Ln(III), Am(III) and Cm(III) ions, this technique is capable of determining some structural parameters such as the hydration number of the M(III) cations and sometimes the denticity of the ligands bound to these M(III) ions [12][13][14][15][16].…”