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Aliphatic Hydroxamic Acids as Chelating Agents; the Stability of Their Proton and Metal Complexes
Author(s) -
Liu ChuenYing,
Chang HuoyJoung,
Uang SuhShiang,
Sun PengJoung
Publication year - 1975
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.197500027
Subject(s) - chemistry , acetohydroxamic acid , hydroxamic acid , chelation , inorganic chemistry , stability constants of complexes , ionic strength , reagent , potentiometric titration , metal ions in aqueous solution , acid dissociation constant , aqueous solution , metal , organic chemistry , ion , urease , enzyme
Three kinds of aliphatic hydroxamic acids, i.e ., acetohydroxamic acid, n ‐butyrohydrozamic acid, and sorbohydroxamic acid have been prepared as free acids and potassium salts. Their acid dissociation constants and the formation constants of complexes formed by some bivalent metal ions of the first transition element (Mn, Co, Ni, Cu, Zn) with these three chelating agents in aqueous solution have been determined by using potentiometric titration technique at ionic strength of 0.1 M by sodium perchlorate and at a temperature of 25°C±0.1°. The stability of the transition metal ion complexes with these aliphatic hydroxamic acids is in the order MnZn, which is in agreement with the Irving and William's rule. The chelating forming properties and the comparison of quality as analytical reagent of these three hydroxamic acids were discussed in terms of the proton displacement constant. Sorbohydroxamic acid is superior in its reactivity and the other respects among the three reagents.