Preparation, characterization and determination of acid dissociation and stability constants of some acid divalent-metal 1 : 2 nitrilotriacetate complexes

2004 ◽  
Vol 57 (10) ◽  
pp. 825-831 ◽  
Author(s):  
E.R. Souaya ◽  
W.G. Hanna ◽  
E.H. Ismail ◽  
N.E. Milad
Keyword(s):  
Stability Constants ◽  
Divalent Metal ◽  
Acid Dissociation ◽  
Dissociation And Stability Constants

Characterization of α-Isosaccharinic acid: pKa-determination

2002 ◽  
Vol 757 ◽  
Author(s):  
S. Ekberg ◽  
C. Ekberg ◽  
Y. Albinsson
Keyword(s):  
Stability Constant ◽  
Stability Constants ◽  
Linear Functions ◽  
Acid Dissociation ◽  
Complexation Studies ◽  
Pka Determination ◽  
The Stability ◽  
Isosaccharinic Acid

ABSTRACTThe stability constant for isosaccharinic acid dissociation is of importance in complexation studies involving species present in radioactive waste. As there are very few stability constants reported in the literature, this study has determined stability constants at 22.8, 34.5 and 44.2° C, using potentiometric titrations in a 1 M NaClO4 solution. The stability constants were linear functions of the inverted temperature, thus allowing for a simple determination of the entropy and enthalpy of the reaction.

Determination of stability constants and thermodynamic parameters for interaction of thiosemicarbazones with divalent metal ions

2010 ◽  
Vol 63 (7) ◽  
pp. 1220-1227 ◽  
Author(s):  
Rakesh K. Mahajan ◽  
Kulwinder K. Vohra ◽  
Poonam Arora ◽  
Rekha Sharma ◽  
T.S. Lobana
Keyword(s):  
Metal Ions ◽  
Thermodynamic Parameters ◽  
Stability Constants ◽  
Divalent Metal ◽  
Divalent Metal Ions

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

Dissociation of imino proton(s) of a highly water-soluble metal-free phthalocyanine and determination of its pKa value in water

2013 ◽  
Vol 17 (06n07) ◽  
pp. 447-453 ◽  
Author(s):  
Hiroaki Isago ◽  
Harumi Fujita
Keyword(s):  
Aqueous Media ◽  
Thermal Reaction ◽  
Water Soluble ◽  
Acid Dissociation ◽  
Acid Dissociation Constant ◽  
Metal Free ◽  
Imino Proton ◽  
Pka Value ◽  
Triton X

Dissociation of imino proton(s) in the cavity of the macrocycle of a highly water-soluble, metal-free phthalocyanine ( H 2( H 4 tsppc ); where H 4 tsppc denotes tetrakis{(2′,6′-dimethyl-4′-sulfonic acid)phenoxy}phthalocyaninate) in ethanolic and aqueous solutions has spectrophotometrically been investigated. The spectral changes associated with reaction with NaOH have been found to involve one-proton transfer process in aqueous media while two-protons process in ethanolic media. The acid-dissociation constant of the first imino proton in water (in the presence of Triton X-100) has been determined to be 12.5 ± 0.2 (as pKa) at 25 °C. The doubly deprotonated species in EtOH has been easily converted to its corresponding cobalt(II) derivative by thermal reaction with anhydrous CoCl 2.

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