Dependence on Ionic Strength of Formation Constants, Protonation, and Complexation of Nitrilotriacetic Acid with Tungsten(VI) in Sodium Perchlorate Aqueous Solution

2004 ◽  
Vol 49 (3) ◽  
pp. 439-443 ◽  
Author(s):  
Kavosh Majlesi ◽  
Karim Zare ◽  
Faranak Teimouri
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Sodium Perchlorate ◽  
Nitrilotriacetic Acid ◽  
Formation Constants ◽  
Dependence On Ionic Strength

Dependence on Ionic Strength of Polyamine Protonation in NaCl Aqueous Solution

2001 ◽  
Vol 46 (6) ◽  
pp. 1425-1435 ◽  
Author(s):  
Alessandro De Robertis ◽  
Claudia Foti ◽  
Ottavia Giuffrè ◽  
Silvio Sammartano
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Dependence On Ionic Strength

Formation et stabilité de complexes hydroxo–ammonio en solution aqueuse. I. Complexes de zinc

1968 ◽  
Vol 46 (10) ◽  
pp. 1707-1714 ◽  
Author(s):  
A. O. Gubeli ◽  
J. Ste-Marie
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Formation Constants ◽  
New Method ◽  
Hydroxo Complexes ◽  
Solution Aqueuse

A new method has been developed for the calculation of the formation constants of complexes in equilibrium with a precipitate in aqueous solution. This has been applied to the study of ammonio and ammonio–hydroxo complexes of zinc in the presence of the hydroxide. The curves of solubility vs. pH and pNH3 tot have been established by means of 65Zn at 25 °C and ionic strength 1.0 with NaClO4.

Coordinating Properties of Aromatic and Aliphatic Sulfur with Bivalent Metals in Aqueous Solution. A Calorimetric Study

1979 ◽  
Vol 32 (4) ◽  
pp. 709 ◽  
Author(s):  
R Aruga
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Complex Formation ◽  
Aqueous Medium ◽  
Formation Constants ◽  
Calorimetric Study ◽  
Thermodynamic Quantities ◽  
Direct Calorimetry ◽  
Bivalent Metals

Heats and entropies of complex formation of the thiophen-2-carboxylate ion with Ni2+, Cu2+, Zn2+ and Cd2+ have been determined by direct calorimetry, the formation constants being known from the literature. The measurements were carried out in aqueous medium at 25�C and an ionic strength of 1. The values of the thermodynamic quantities for thiophen-2-carboxylate, compared with those for (ethylthio)acetate and (phenylthio)acetate obtained previously, indicate a greater tendency for aromatic sulfur to form bonds with the above metals than for aliphatic sulfur. The causes of this behaviour are discussed.

scholarly journals Interaction of Dioxovanadium (V) ion with L-alanine at Different Ionic Strengths

2009 ◽  
Vol 5 (1) ◽  
pp. 570-574
Author(s):  
Mohammad Hossein Fekri ◽  
F. Gharib ◽  
M. Darvishpour
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Stability Constants ◽  
Least Squares Method ◽  
Type Equation ◽  
Formation Constants ◽  
Amino Group ◽  
Fitting Method ◽  
The Stability ◽  
Curve Fitting Method

The formation constants of species formed in the system H+ + alanine and VO2+ +alanine have been determined in aqueous solution for 1.0<pH<7.0 and at different ionic strengths ranging from 0.1 to 1.0 mol dm-3 NaClO4, using a combination of potentiometric and spectrophotometric techniques.The compositions of the formd complexes and their stability constants were determined by curve fitting method and it was shown that dioxivanadium(V) forms two mononuclear 1:1 and 1:2 species with alanineof type VO2L and VO2L2-.The porotonation constant of the amino group of alanine has been determined using potentiometric techniques and calculated using a computer program wich employ a least-squares method. The dependence of the porotonation of alanine and the stability constants of the species on ionic strength are described by a deby-huckel type equation.

Chelation Reactions of Adenine

1972 ◽  
Vol 27 (6) ◽  
pp. 688-690 ◽  
Author(s):  
Ram Nayan ◽  
Arun K. Dey
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Metal Ions ◽  
Formation Constants ◽  
Ph Titration ◽  
Ionic Concentrations ◽  
Antimitotic Drug ◽  
Titration Technique

Chelation reactions of the antimitotic drug, 6-amino-purine (adenine; abbr. ADN) with the metal ions: Be(II), Al(III), Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Pb(II), and UO2(II) have been investigated in aqueous solution at 30° using Bjerrum-Calvin pH titration technique. The formation constants have been determined at various ionic concentrations, and have been extrapolated to zero ionic strength to get the thermodynamic values of the constants.

Interaction of dimethyltin(IV)dichloride with 5′-AMP and 5′-GMP

2006 ◽  
Vol 84 (11) ◽  
pp. 1534-1540 ◽  
Author(s):  
Farrokh Gharib ◽  
Elnaz Farzad ◽  
Mostafa Mohammadpour Amini
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Ftir Spectroscopy ◽  
Constant Temperature ◽  
Elemental Analysis ◽  
Formation Constants ◽  
Low Ph ◽  
Ph Values ◽  
Species Formation ◽  
Ph Range

The formation constants of the species formed in the systems H+ + dimethyltin(IV) + 5′-AMP and 5′-GMP, H+ + 5′-AMP, and H+ + 5′-GMP have been determined in aqueous solution in the pH range of 1.5–9 at constant temperature (25 °C) and constant ionic strength (0.1 mol dm–3, NaClO4) using spectrophotometric and potentiometric techniques. 1H and 31P NMR investigations in aqueous solution confirmed the species formation and led us to propose their structures. The precipitated complexes of AMP and GMP by Me2Sn(IV)2+ at low pH values were characterized by elemental analysis and FTIR spectroscopy, which ruled out purine moiety (N-1 and N-7) coordination and a bidentated coordination of the phosphate group is concluded in both cases.Key words: dimethyltin(IV)dichloride, guanosine 5′-monophosphate, adenosine 5′-monophosphate, stability and protonation constants.

Dependence on Ionic Strength of Protonation Enthalpies of Polycarboxylate Anions in NaCl Aqueous Solution

2001 ◽  
Vol 46 (6) ◽  
pp. 1417-1424 ◽  
Author(s):  
Concetta De Stefano ◽  
Claudia Foti ◽  
Ottavia Giuffrè ◽  
Silvio Sammartano
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Dependence On Ionic Strength
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