Studies on the mixed-ligand complexes of copper(II) with gallic acid and pyridine carboxylic acids and their benzologues

Autor: Abu-Bakr, M. S., Rageh, H. M., Hashem, E. Y., Moustafa, M. H.
Zdroj: Monatshefte für Chemie / Chemical Monthly; November 1994, Vol. 125 Issue: 11 p1197-1205, 9p
Abstrakt: The ternary complex formation of copper(II) with gallic acid (gal) and 2-hydroxy nicotinic acid (hyna), 2-mercapto nicotinic acid (mena), salicylic acid (sa) or thiosalicylic acid (tsa) as a second ligand in a 1:1:1 molar ratio has been investigated in 40% (v/v) ethanol using spectrophotometric andpH titration methods. The solution equilibria of the ternary systems have been determined and the stability constants of the mixed complexes has been evaluated. Considering all parameters, the Cu-gal-sa ternary system was proved as a suitable, rapid, and sensitive spectrophotometric indicator for determining traces of copper.
Databáze: Supplemental Index
Externí odkaz: