Formation constants of complexes of N-m-tolyl-benzohydroxamic acid (m-TBHA) with some divalent metal ions

1975 ◽  
Vol 37 (7-8) ◽  
pp. 1830-1831 ◽  
Author(s):  
T.P. Sharma ◽  
Y.K. Agrawal
Keyword(s):  
Metal Ions ◽  
Formation Constants ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Benzohydroxamic Acid

Formation constants for magnesium and calcium citrate complexes

1980 ◽  
Vol 33 (7) ◽  
pp. 1511 ◽  
Author(s):  
KN Pearce
Keyword(s):  
Aqueous Solution ◽  
Citric Acid ◽  
Metal Ions ◽  
Formation Constants ◽  
Potassium Citrate ◽  
Divalent Metal ◽  
Calcium Citrate ◽  
Divalent Metal Ions ◽  
Citrate Complex

centration formation constants for magnesium and calcium citrate complexes have been redetermined from pH titrations of citric acid in the absence and presence of the divalent metal ions in aqueous solution at 2° Values for the constants, corrected for the presence of potassium citrate complex, are presented and critically compared with literature values. Values for the formation constants of strontium and barium citrate complexes are also reported.

scholarly journals Metal complexes of triazine - Schiff bases: Spectroscopic and thermodynamic studies of complexation of some divalent metal ions with 3-(α-acetylethylidenehydrazino)-5,6-diphenyl-1,2,4-triazine

1999 ◽  
Vol 64 (10) ◽  
pp. 621-635 ◽  
Author(s):  
M. Mashaly ◽  
H.A. Bayoumi ◽  
A. Taha
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Metal Complexes ◽  
Water Solution ◽  
Formation Constants ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Different Temperatures ◽  
Metal Ligand ◽  
Cu And Zn

Metal complexes of some divalent metal ions (Co, Ni, Cu and Zn) with 3-(?- acetylethylidenehydrazino)-5,6-diphenyl-1,2,4-triazine (AHDT) as a Schiff-base have been investigated potentiometrically and spectrophotometrically and found to have the stoichiometric formulae 1:1 and 1:2 (M:L). The formation constants of the proton-ligand and metal-ligand complexes have been determined potentiometrically at different temperatures (10, 20, 30, 40 and 50?C) at an ionic strength of 0.1MKNO3 in 75%(v/v) dioxane-water solution. The standard thermodynamic parameters, viz. ?Go, ?Ho, and ?So, for the proton-ligand and the stepwise metal-ligand complexes have been evaluated.

Spectroscopic and thermodynamic studies of complexation of some divalent metal ions with isatin-β-thiosemicarbazone

2007 ◽  
Vol 61 (6) ◽  
Author(s):  
S. Konstantinović ◽  
B. Radovanović ◽  
Z. Todorović ◽  
S. Ilić ◽  
B. Konstantinović
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Metal Complexes ◽  
Dissociation Constants ◽  
Water Solution ◽  
Molecular Complexes ◽  
Formation Constants ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Different Temperatures

AbstractMetal complexes of some divalent metal ions (Co, Ni, Cu, Zn, Hg, and Pd) with isatin-β-thiosemicarbazone (ITS) as the Schiff base have been investigated potentiometrically and spectrophotometrically. The dissociation constants of the ligand and formation constants of the metal complexes, as well as the corresponding thermodynamic functions (ΔG, ΔH and ΔS) have been determined at different temperatures in ethanol—water solution. The full stability constants were also evaluated spectrophotometrically by the Job method. The experimental results indicate that Cu(II), Zn(II), Pd(II), and Hg(II) form one-to-one molecular complexes (ML) with the studied ligand, whereas Co(II) and Ni(II) form both ML and ML2 species.

Interaction of divalent metal ions with the NADP+-malic enzyme from maize leaves

1991 ◽  
Vol 81 (4) ◽  
pp. 462-466 ◽  
Author(s):  
Maria Fabiana Drincovich ◽  
Alberto A. Iglesias ◽  
Carlos S. Andreo
Keyword(s):  
Metal Ions ◽  
Malic Enzyme ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Maize Leaves
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