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Stabilities and Thermodynamic Properties of Ethylenediamine‐ di ( o ‐Hydroxyphenylacetic Acid) Chelates of Tripositive Lanthanide Ions
Author(s) -
Hseu TongMing,
Wu ShwuTzy,
Lin ZuiFeng
Publication year - 1985
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198500044
Subject(s) - lanthanide , ethylenediamine , chemistry , chelation , enthalpy , stability constants of complexes , protonation , ion , inorganic chemistry , ionic strength , analytical chemistry (journal) , thermodynamics , organic chemistry , aqueous solution , physics
The interaction between ethylenediamine‐di( o ‐hydroxyphenylacetic acid) (EDDHA, H 4 Z) and tripositive lanthanide ions has been investigated. The formation constants of the protonated chelates (LnHZ) and those of the normal chelates (LnZ − ) have been evaluated at various temperatures and at a constant ionic strength of 0.1(KNO 1 ). For LnHZ, the p H‐titrimetric technique, and for LnZ − , the mercury indicator electrode method were used. The enthalpy and entropy changes characterizing the formation of LnZ − have been calculated at 25° and, these functions have been compared with the corresponding values of other lanthanide chelates with related chelating agents.