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Citation: Gao Feng, Niu Chun-Ji, Ni Jia-Zuan. Thermodynamics of Complexation of Rare Earths by L-Methionine[J]. Acta Physico-Chimica Sinica, ;1991, 7(03): 276-280. doi: 10.3866/PKU.WHXB19910304 shu

Thermodynamics of Complexation of Rare Earths by L-Methionine

1.
Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022

Received Date: 20 February 1990
Available Online: 15 June 1991

The protonation constant of the ligand and stability constants of its complexes with rare earths have been determined by poteatiometric titration at 25 ℃ and ionic strength μ=0.15 mol·L~(-1)(NaCl). The results indicate that rare earth elements can form 1:1 complexes with L-methionine. There is an apparent "tetrad effect" in this system. Shift of the yttrium position to the vicinity of Gd can be explained by the different polarization between the Ln~(3+) and the ligand. The enthalpy ehanges(△H_(101)) of the coordination reaction as represented by the reaction (M+L<=>ML) have been measured by calorimetric titration, where M and I denote rare earths and L-Met respectively. The ΔG_(101) and ΔS_(101) of these reaction have been calculated by using Gibbs' equation. Furthermore, the stability of rare earth complexes with L-Met has been compared with that of Cu~(2+), Zn~(2+), Fe~(2+), Fe~(3+) complexes with L-Met.
- Rare earth; Methionine; Coordination compounds; Thermodynamic parameters
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