| Autor: |
Lutoshkin MA; Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center 'Krasnoyarsk Science Center SB RAS', Akademgorodok st. 24/51, 660036 Krasnoyarsk, Russian Federation.; Krasnoyarsk State Medical University named after Professor V. F. Voyno-Yasenetsky, Partizana Zheleznyaka st, 1, 660022 Krasnoyarsk, Russian Federation. |
| Abstrakt: |
Over the course of the past several decades, spectroscopic surveys have unveiled the intricate nature of the aqueous chelation of Rare Earth Metals. Herein, we have collected a large data set about the interaction between 16 metal ions (Sc 3+ , Y 3+ , La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ , and Lu 3+ ) and perfluorinated nonsymmetric β-diketones, which contain chalcogen-bearing heterocyclic rings or aromatic moiety. The role and influence of the side ions on the chelation processes have been re-estimated to obtain revised stability constants. After analysis of more than 150 revised formation constants, a better periodic correlation has been shown. Scrutinizing the effects of the substituted group has revealed an "anti-Coulomb" behavior within the chalcogen group of diketones and a strictly electrostatic trend within the Rare Earth Metals series. Within the first-order approximation, the spin-orbit contribution to the Gibbs free energy of chelation has been estimated. |
