Revised Coordination Model and Stability Constants of Cu(II) Complexes of Tris Buffer

2013 ◽  
Vol 52 (24) ◽  
pp. 13927-13933 ◽  
Author(s):  
Justyna Nagaj ◽  
Kamila Stokowa-Sołtys ◽  
Ewa Kurowska ◽  
Tomasz Frączyk ◽  
Małgorzata Jeżowska-Bojczuk ◽  
...  
Keyword(s):  
Stability Constants ◽  
Tris Buffer ◽  
Coordination Model

Estimation of composition, coordination model, and stability constant of some metal/phosphate complexes using spectral and potentiometric measurements

2009 ◽  
Vol 63 (4) ◽  
Author(s):  
Khalid Abu-Shandi ◽  
Fadel Al-Wedian
Keyword(s):  
Metal Ions ◽  
Stability Constants ◽  
Metal Phosphate ◽  
Hydrogen Phosphate ◽  
Equilibrium Studies ◽  
Nickel Iron ◽  
Potentiometric Titrations ◽  
Coordination Model ◽  
Phosphate System ◽  
Complexation Reactions

AbstractComplexation reactions in a binary metal/phosphate system were studied. Protolytic equilibria of phosphate in the presence of cobalt, nickel, iron, copper, chromium and silver metal ions were investigated by potentiometric titrations in the pH range of 2–11. Stability constants of the metal/phosphate complexes were determined by computer analysis of the potentiometric titration. Potentiometric titrations suggest that the presence of metal phosphate and metal hydrogen phosphate provides the solutions with stability constants logK c 2.21, 2.11, 2.23, 2.34, 1.96, and 2.14 of Co, Ni, Fe, Ag, Cr, and Cu/phosphate, respectively. The results of infrared spectroscopy, X-ray powder diffraction and equilibrium studies were used to reveal the mode of interaction between the metal ions and phosphate. Metal phosphates with a hydrogen phosphate anion and fully nonprotonated phosphate could be isolated under the reaction conditions.

Determination of stability constants for complexes from catalytic linear scan voltammetric currents

1998 ◽  
Vol 95 (5) ◽  
pp. 1091-1100 ◽  
Author(s):  
J. L. Muñiz Alvarez ◽  
J. A. García Calzón ◽  
J. M. López Fonseca
Keyword(s):  
Stability Constants

Changes in the Humic Acid–Metal Complexation Characteristics Depending on Humification Degree / Humīnskābju – Metālu Kompleksveidošanās Rakstura Izmaiņas Atkarībā No Humifikācijas Pakāpes

2012 ◽  
Vol 51 (3) ◽  
pp. 228-237
Author(s):  
D. Dudare ◽  
M. Klavins
Keyword(s):  
Humic Acid ◽  
Stability Constants ◽  
Humic Acids ◽  
Complex Stability ◽  
Peat Layer ◽  
Raised Bog ◽  
Complexing Capacity ◽  
Humification Degree ◽  
Complexation Process ◽  
Complex Stability Constants

The aim of this study is to determine the Cu(II) complexing capacity and stability constants of Cu(II) complexes of humic acids isolated from two well-characterized raised bog peat profiles in respect to the basic properties and humification characteristics of the studied peats and their humic acids. The complex stability constants significantly change within the studied bog profiles and are well correlated with the age and decomposition degree of the peat layer from which the humic acids have been isolated. Among factors that influence this complexation process, molecular mass and ability to form micellar structures (supramolecules) of humic substances are of key importance.

Extraction of strontium and barium salts by the nitrobenzene solution of dicarbolide in the presence of glymes

1985 ◽  
Vol 50 (3) ◽  
pp. 581-599 ◽  
Author(s):  
Petr Vaňura ◽  
Emanuel Makrlík
Keyword(s):  
Stability Constants ◽  
Organic Phase ◽  
Equilibrium Constants ◽  
Minor Role ◽  
Nitrobenzene Solution ◽  
Ligand Structure ◽  
Stability Constants Of Complexes ◽  
Separation Factors ◽  
The Stability ◽  
A Minor

Extraction of microamounts of Sr2+ and Ba2+ (henceforth M2+) from the aqueous solutions of perchloric acid (0.0125-1.02 mol/l) by means of the nitrobenzene solutions of dicarbolide (0.004-0.05 mol/l of H+{Co(C2B9H11)2}-) was studied in the presence of monoglyme (only Ba2+), diglyme, triglyme, and tetraglyme (CH3O-(CH2-CH2O)nCH3, where n = 1, 2, 3, 4). The distribution of glyme betweeen the aqueous and organic phases, the extraction of the protonized glyme molecule HL+ together with the extraction of M2+ ion and of the glyme complex with the M2+ ion, i.e., ML2+ (where L is the molecule of glyme), were found to be the dominating reactions in the systems under study. In the systems with tri- and tetraglymes the extraction of H+ and M2+ ions solvated with two glyme molecules, i.e., the formation of HL2+ and ML22+ species, can probably play a minor role. The values of the respective equilibrium constants, of the stability constants of complexes formed in the organic phase, and the theoretical separation factors αBa/Sr were determined. The effect of the ligand structure on the values of extraction and stability constants in the organic phase is discussed.

scholarly journals A coordination model of pervasive service ecosystems

2015 ◽  
Vol 110 ◽  
pp. 3-22 ◽  
Author(s):  
Mirko Viroli ◽  
Danilo Pianini ◽  
Sara Montagna ◽  
Graeme Stevenson ◽  
Franco Zambonelli
Keyword(s):  
Coordination Model ◽  
Pervasive Service ◽  
Service Ecosystems

The use of electronic computing techniques in the calculation of stability constants

1971 ◽  
Vol 33 (7) ◽  
pp. 2051-2065 ◽  
Author(s):  
F.J.C. Rossotti ◽  
H.S. Rossotti ◽  
R.J. Whewell
Keyword(s):  
Stability Constants ◽  
Electronic Computing
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