Solution Behaviour of Ternary Complexes of Cobalt (II) Involving Sulfanilamide and Dicarboxylic acids

摘要

Stability constants and complex formation equilibria between Co(II) and sulfanilamide (SM) withdicarboxylic acids (L) were studied pH-metrically at 25 ± 0.1 °C and ionic strength I= 0.1 mol/L NaClO4in aqueous solutions. The stepwise method is responsible for the formation of [Co(II)-SM-L] complexes,while dicarboxylic acid ligation follows sulphanilamide-Co(II) binding. Stability constants wereobtained by applying the potentiometric data in HYPERQUAD computer program. The stoichiometryof the formed complexes was confirmed by conductometric method. A comparison between binaryand ternary complexes’ relative stabilities was conducted.