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Titolo:
POTENTIOMETRIC AND CONDUCTOMETRIC STUDIES ON THE BINARY AND MIXED-LIGAND COMPLEXES IN SOLUTION - M-II-DIPICOLINIC ACID GLYCINE SYSTEMS
Autore:
KHALIL MM; MOHAMED SA; RADALLA AM;
Indirizzi:
CAIRO UNIV,FAC SCI,DEPT CHEM,BENI SUEF BRANCH BANI SUWAYF EGYPT
Titolo Testata:
Talanta
fascicolo: 8, volume: 44, anno: 1997,
pagine: 1365 - 1369
SICI:
0039-9140(1997)44:8<1365:PACSOT>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
TERNARY COMPLEXES; COPPER(II);
Keywords:
BINARY AND TERNARY COMPLEXES; DIPICOLINIC ACID; POTENTIOMETRIC AND CONDUCTOMETRIC STUDIES;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
M.M. Khalil et al., "POTENTIOMETRIC AND CONDUCTOMETRIC STUDIES ON THE BINARY AND MIXED-LIGAND COMPLEXES IN SOLUTION - M-II-DIPICOLINIC ACID GLYCINE SYSTEMS", Talanta, 44(8), 1997, pp. 1365-1369

Abstract

The binary and mixed ligand complexes of some alkaline earth and transition metal (II) ions with dipicolinic acid (DPA) as a primary ligandand the biologically important secondary ligand (glycine), were studied using potentiometric technique. The acidity constants of the ligands were determined and used for determining the stability constants of the complexes formed in aqueous solutions under the experimental conditions (t = 25 degrees C, mu = 0.1 M NaNO3). The dissociation constantsof DPA were also determined in various water + dioxane mixtures underthe same experimental conditions. It is concluded that a pronounced change in the pK values is observed as the solvent is enriched in dioxane. The values of Delta logK have been evaluated and discussed. In addition, the chelation mode of ternary complexes was ascertained by conductivity measurements. (C) 1997 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 08:25:34