Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7839877 | Journal of Luminescence | 2018 | 6 Pages |
Abstract
The hydrolysis of Eu(III) and Am(III) begins near neutral pH conditions, above which precipitation occurs due to low solubility. Careful sample characterization steps are a prerequisite for the speciation study of hydrolyzed Eu(III) complexes without the interference of colloidal particles or precipitation. Herein, the hydrolysis reaction of Eu(III) was studied using time-resolved laser fluorescence spectroscopy (TRLFS). Laser-induced breakdown detection was employed to monitor the presence of colloidal particles. The luminescence properties of Eu(III) and precipitated Eu(OH)3(s) were investigated and comparisons were made to those of aqua Eu3+. Parallel factor analysis was applied for the deconvolution of the TRLFS results. Both primary hydrolyzed Eu(III), EuOH2+ and precipitated Eu(OH)3(s) showed distinct luminescence spectral properties, including an enhanced hypersensitive luminescence peak (Jâ¯=â¯2). An increased luminescence lifetime was observed for both EuOH2+ (Ïâ¯=â¯130â¯Â±â¯1â¯Î¼s) and precipitated Eu(OH)3(s) (Ïâ¯=â¯158â¯Â±â¯7â¯Î¼s) compared to that of aqua Eu3+ (Ïâ¯=â¯112â¯Â±â¯1â¯Î¼s). A formation constant log*β1,1 of EuOH2+ at Iâ¯=â¯0.1â¯M NaClO4 and 25â¯Â°C was measured to be -8.28â¯Â±â¯0.22, which was converted to log*β°1,1 =â¯-7.87â¯Â±â¯0.22 at an infinitely diluted condition of Iâ¯=â¯0 based on the specific ion interaction theory.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Hee-Kyung Kim, Seonggyu Choi, Euo Chang Jung, Hye-Ryun Cho, Jong-Il Yun, Wansik Cha,