US EPA

6851772 

Journal Article 

STUDY OF TERNARY COMPLEXES INVOLVING A TRIDENTATE AND A MONODENTATE LIGAND WITH SIDE-GROUPS 

Manjula, V; Manjula, V; Patel, P; Patel, P; Bhattacharya, PK; Bhattacharya, PK 

1995 

1 

Indian Journal of Chemistry. Section A
ISSN: 0376-4710
EISSN: 0975-0975 

34 

10 

819-821 

WOS:A1995RW56600012 

Stability constants of mixed ligand complexes (MAL) [where M = Cu(II) Ni(II)A = indole acetic acid (IAA) (A), indole propionic acid IPA (A), indole butyric acid IBA (A), L = 2-(o-hydroxybeniylamino) acetic acid (HBAA) ((1)) = 2-(o-hydroxybenzylamino) propionic acid (HEAP) (L(2))= 2-(o-hydroxybenzylamino)-3-(phenyl) propionic acid (HBAPP) L(3), 2-(o-hydroxybenzylamino)-3-(p-hydroxyphenyl) propionic acid (HBAHPP). L(4), 2[-(o-hydroxybenzylamino 3-(3-indolyl) propionic acid] [HBAIP] L(5), have been determined by potentiometric pH titrations in 50% v/v dioxan water medium. The ternary complexes are significantly stable due to intramolecular interligand interactions between indole residue of A and non-coordinating side groups of L. The relative stabilities. of Cu(II) and Ni(II) complexes have been explained on the basis of new concept of interaction between metal orbital and non-coordinating group of the two ligands.<