M. Padmavathi et S. Satyanarayana, Potentiometric and proton NMR studies on ternary metal (II) complexes containing thiaminepyrophosphate and a series of secondary ligands, I J CHEM A, 38(3), 1999, pp. 295-298
Citations number
19
Categorie Soggetti
Chemistry
Journal title
INDIAN JOURNAL OF CHEMISTRY SECTION A-INORGANIC BIO-INORGANIC PHYSICAL THEORETICAL & ANALYTICAL CHEMISTRY
Ternary metal complexes of the type MLA, where M = Cu (II), Zn (II),Ni (II)
and Co (II), L = thiaminepyrophosphate (TPP) and A = glycine, alanine, phe
nylalanine, tryptophan, tyrosine, pyrocatechol, oxalic acid, malonic acid,
imidazole, benzimidazole, and 5,6-dimethylbenzimidazole have been investiga
ted potentiometrically at 35 degrees C and mu = 0.1M (KNO3). The stability
constants have been determined using BEST Computer program. The stabilities
of ternary complexes increase in the order O- - O- donors < N-donors. Cu (
II) ternary complexes are found to be less stable than the corresponding Co
(II), Ni(II) and Zn(II) complexes. Interaction of these ligands, TPP and tr
yptophan or TPP and imidazole with Zn (II) in deuterium oxide solution are
also studied by H-1 NMR.