A novel ionophoretic technique in the study of binary and ternary metal-4-hydroxybenzoate complexes

Department of Chemistry, University of Allahabad, Allahabad-211 002, India
E-mail : sumi07mar@yahoo.com
Manuscript received 30 January 2004, revised 13 August 2004, accepted 11 January 2005

lonophoretic technique has been used for the study of Fe^III/, Cu^II/, Ni^II/, Co^II-4-hydroxybenzoate binary and Fe^III/, Cu^II/, Ni^II/, Co^II - 4-hydroxybenzoate NTA (nitrilotriacetic acid) ternary complexes. The stability constants of metal-4-hydroxybenzoate binary complexes are found to be 10^3·57, 10^2·46, 10^2·43 and 10^2.40 and the stability constants of metal-4-hydroxybcnzoate-NTA ternary complexes  have been found to be 10^5·70, 10^5·65, 10^5·55 and 10^5.50 for Fem, Cu^II, Ni^II and Co^II complexes respectively at µ = 0.1 M (NaCIO₄) and 25°C.