Premium
Determination of Stability Constants of Metal Complexes by Capillary Electrophoresis
Author(s) -
Allen Chang C.,
Chen ChangYuh,
Chen HuanYuan
Publication year - 1999
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.199900070
Subject(s) - chemistry , lanthanide , capillary electrophoresis , stability constants of complexes , ligand (biochemistry) , metal , transition metal , ion exchange , metal ions in aqueous solution , divalent , inorganic chemistry , analytical chemistry (journal) , ion , chromatography , organic chemistry , aqueous solution , biochemistry , receptor , catalysis
Abstract The stability constants of several divalent first row transition and trivalent lanthanide metal complexes were determined by capillary electrophoresis (CE) methods. Four different approaches, i.e. direct formation, ligand exchange, metal exchange and metal‐ligand double exchange were developed. To verify if these CE methods are indeed applicable, the stability constant of CuHEDTA was re‐determined to be 17.47 ± 0.20 (consistent with the published 17.50) using the CuEDTA and ZnHEDTA metal‐ligand double exchange approach. The stability constants of lanthanide (Ce 3+ and Eu 3+ ) and transition metal (Ni 2+ and Zn 2+ ) complexes of an aminopolycarboxylate ligand, DO2A (1,7‐dicarboxymethyl‐1,4,7,10‐tetraazacyclododecane) were measured under the direct complex formation condition. The stability constant of the NiDO2A complex was determined by the ligand exchange method using 1,4,8,11‐tetraazaundecane (2,3,2‐tet) as the competing ligand. The stability constant of CuDO2A complex was determined by the metal exchange method using Zn 2+ ion as the competing metal ion, and complex formation competitions of Ni 2+ and Cu 2+ between DO2A and 2,3,2‐tet were studied by the metal‐ligand double exchange method. Effects of experimental conditions and the advantages and limitations of these CE methods are discussed.