A critical review on the stability constants of the fluoride complexes of actinides in aqueous solution and their correlation with fundamental properties of the ions

1999 ◽  
Vol 240 (3) ◽  
pp. 993-1011 ◽  
Author(s):  
N. K. Chaudhuri ◽  
R. M. Sawant ◽  
D. D. Sood
Keyword(s):  
Aqueous Solution ◽  
Stability Constants ◽  
Critical Review ◽  
Fundamental Properties ◽  
Fluoride Complexes ◽  
The Stability

scholarly journals Copper(II)-complexation by non enzymatically glycated peptides

2004 ◽  
Vol 22 (SI - Chem. Reactions in Foods V) ◽  
pp. S106-S108
Author(s):  
S. T Seifert ◽  
R. Krause ◽  
K. Gloe ◽  
T. Henle
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
Stability Constants ◽  
Maillard Reaction ◽  
Metal Binding ◽  
Maillard Reaction Products ◽  
Reaction Products ◽  
Nonenzymatic Glycation ◽  
The Stability

The purpose of our work was to examine the metal binding abilities of selected peptide bound Maillard reaction products (MRPs). The N<sup>α</sup>-hippuryl-protected MRPs N<sup>ε</sup>-fructoselysine and N<sup>ε</sup>-carboxymethyllysine were synthesised and measurement of stability constants for complexes formed with the physiologically important metal ions copper(II) and zinc(II) was carried out in aqueous solution (T = 298.1 K; I = 0.1M KNO<sub>3</sub>) using pH-potentiometry. The stability constants of N<sup>ε</sup>-fructoselysine and N<sup>ε</sup>-carboxymethyllysine with Cu(II) proved that new coordination centres are formed by the nonenzymatic glycation of proteins. With zinc(II) no complexation was observed. Physiological consequences are discussed, but further studies are necessary in order to clarify the effects of this phenomenon.

scholarly journals Interaction of Ampicillin and Amoxicillin with Mn2+: A Speciation Study in Aqueous Solution

Molecules ◽  
2020 ◽  
Vol 25 (14) ◽  
pp. 3110
Author(s):  
Claudia Foti ◽  
Ottavia Giuffrè
Keyword(s):  
Aqueous Solution ◽  
Stability Constants ◽  
Metal Ion ◽  
Formation Constants ◽  
Enthalpy Change ◽  
Ligand Concentration ◽  
Empirical Parameter ◽  
Speciation Study ◽  
Potentiometric Measurements ◽  
The Stability

A potentiometric and UV spectrophotometric investigation on Mn2+-ampicillin and Mn2+-amoxicillin systems in NaCl aqueous solution is reported. The potentiometric measurements were carried out under different conditions of temperature (15 ≤ t/°C ≤ 37). The obtained speciation pattern includes two species for both the investigated systems. More in detail, for system containing ampicillin MLH and ML species, for that containing amoxicillin, MLH2 and MLH ones. The spectrophotometric findings have fully confirmed the results obtained by potentiometry for both the systems, in terms of speciation models as well as the stability constants of the formed species. Enthalpy change values were calculated via the dependence of formation constants of the species on temperature. The sequestering ability of ampicillin and amoxicillin towards Mn2+ was also evaluated under different conditions of pH and temperature via pL0.5 empirical parameter (i.e., cologarithm of the ligand concentration required to sequester 50% of the metal ion present in traces).

The Extraction of Anionic Beryllium Complexes by Tri-iso-octylamine

1962 ◽  
Vol 15 (3) ◽  
pp. 457 ◽  
Author(s):  
HJ de Bruin ◽  
D Kairaitis ◽  
RB Temple
Keyword(s):  
Aqueous Solution ◽  
Stability Constants ◽  
Complexing Agents ◽  
Conditional Stability ◽  
Tertiary Amines ◽  
Ph Titration ◽  
Anionic Complexes ◽  
The Stability ◽  
Conditional Stability Constants ◽  
Beryllium Complexes

The extraction of beryllium from aqueous solution by long-chain tertiary amines has been observed in the presence of ligands giving rise to anionic complexes. The nature of the oxalate complex extracted by solutions of tri-iso-octylamine in chloroform has been studied in detail and the species formed in the organic phase were shown to have the composition Be(C2O4)2.{NH(i-C8H15)3}2. The complexes formed in aqueous solution between beryllium and several anionic complexing agents have been examined by the method of pH-titration. Conditional stability constants have been obtained for the complexes formed with oxalic, malonic, maleic, succinic, phthalic, and salicylic acids. Differences in their extractabilities can be explained semiquantitatively with the help of the stability constants and the acid association constants of the complexing agents.

The stability constants of thorium(IV) complexes with α-, β- and γ-hydroxymonocarboxylate ligands in aqueous solution

1973 ◽  
Vol 35 (12) ◽  
pp. 4237-4243 ◽  
Author(s):  
L. Magon ◽  
A. Bismondo ◽  
L. Maresca ◽  
G. Tomat ◽  
R. Portanova
Keyword(s):  
Aqueous Solution ◽  
Stability Constants ◽  
The Stability
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