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Interactions between ions and free or immobilized ligands. Application of the competition method
Author(s) -
Smid Johannes
Publication year - 1994
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19940850114
Subject(s) - counterion , chemistry , affinities , ligand (biochemistry) , chromophore , ionic bonding , stability constants of complexes , toluene , ether , ion , yield (engineering) , equilibrium constant , binding constant , polymer chemistry , stereochemistry , inorganic chemistry , organic chemistry , binding site , materials science , receptor , metallurgy , biochemistry
Application of a competition method to determine affinities of ligands for ionic species in low polarity media is described. A soluble ligand, L, and a network‐immobilized ligand, N, are allowed to interact with the counterion of an ionic chromophore A” according to the reaction NM + A − + L → LM + A − + N (K). K values were determined in toluene and in ether‐type solvents for linear and macrocyclic polyethers and polyamines, as well as for other cation‐complexing agents, by varying either N or L. In solvents such as dioxane, binding constants of M + A − to N can be determined directly. Combined with K values they yield the complex formation constant, K L , of the reaction M + A − + L → LM+A − .