Abstract
The formation constants and the respective variations of enthalpy were obtained by means of calorimetric titration of the lanthanides La 3+ and Nd 3+ with bromide and nitrate in N,N-dimethylacetamide. These thermochemical data were calculated for the 1:1 and 1:2 species which are less stable than the corresponding species obtained with chloride. The order of stability Cl − > Br −>NO 3 − was established for both species of La 3+, and the order Br −>Cl −>LNO 3 − for 1:1 species of Nd 3+. NdCl 2 + and NdBr 2 + species were not detected. Our results support the view that the metal-anion interactions involve inner sphere species.
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