N. V. Chernyavskaya

Composition and stability of lead(II) compounds with N-(carboxymethyl)aspartic and N,N-bis(carboxymethyl)aspartic acids in aqueous solutions

The reactions of N-(carboxymethyl)aspartic (H3Y) and N,N-bis(carboxymethyl)aspartic (H4X) acids with Pb2+ ions were studied by potentiometric titration at 298.15 K and I = 0.2, 0.5, and 1.0 (KNO3). The formation of complex species PbY−, PbHX−, and PbX2− was found and their stability constants were calculated.

Thermodynamics of the formation of Sm3+-ethylenediamine-N,N′-disuccinic acid complexes in aqueous solutions at 298.15 K

The thermodynamic parameters of the formation of the complexes of ethylenediamine-N,N′-disuccinic acid (H4Y) with Sm3+ ion are determined by means of calorimetry and measuring pH at 298.15 K and ionic strengths of 0.5, 1.0, and 1.5 (KNO3). The values of logK, ΔrG, ΔrH, and ΔrS are calculated for the formation of SmY− and SmHY complexes at fixed and zero values of ionic strength. The resulting values are interpreted.

Thermodynamics of the complexation between the Cu2+ Ion and L-aspartic acid in aqueous solution

The enthalpies of complexation between L-aspartic acid (H2Asp) and the Cu2+ ion at 298.15 K and I = 0.5, 0.75, and 1.0 (KNO3) were determined from calorimetric data. The thermodynamic characteristics of the formation of the complexes CuAsp and CuAsp22− were calculated for fixed and zero ionic strengths.

Thermodynamics of the complexation of ethylenediaminesuccinates of cerium subgroup lanthanides at 298.15 K

Thermodynamic parameters of the complex formation reactions of ethylenediamine-N,N′-disuccinic acid (H4Y) with La3+, Ce3+, Pr3+, and Nd3+ ions are determined by means of calorimetry and pH-metry in aqueous solutions at 298.15 K and ionic strength I = 0.5 (KNO3). Values of logK, ΔrG, ΔrH, and ΔrS are calculated for reactions of LnY- and LnHY complex formation. Changes in the thermodynamic parameters of reactions in the lanthanides series are discussed.

The thermodynamic characteristics of complex formation between Cd2+ and iminodisuccinic acid in aqueous solution

The enthalpies of complex formation between iminodisuccinic acid (H4L) and the Cd2+ ion were determined calorimetrically at 298.15 K and ionic strengths 0.5, 1.0, and 1.5 (KNO3). The thermodynamic characteristics of formation of CdL2− and CdHL− complexes at fixed and zero ionic strength values were calculated.

The thermodynamic characteristics of complex formation between Cd2+ and ethylenediamine-N,N′-disuccinic acid in aqueous solution

The enthalpies of complex formation between ethylenediamine-N,N′-disuccinic acid (H4A) and Cd2+ ions were determined calorimetrically at 298.15 K and ionic strengths of 0.5, 1.0, and 1.5 (KNO3). The thermodynamic characteristics of formation of the CdA2− and CdHA− complexes at fixed and zero ionic strengths were calculated. The values obtained were interpreted.

The heat effects of dissociation of N-(carboxymethyl)aspartic acid

The heat effects of dissociation of N-(carboxymethyl)aspartic acid were determined calorimetrically at 298.15 K and various ionic strength values. The standard thermodynamic characteristics of dissociation of the complexone at fixed and zero ionic strengths were calculated.

The Standard Enthalpies of Formation of Crystalline Diethylenetriamino-N,N,N′,N″,N″-pentaacetic Acid and Its Dissociation Products

AbstractThe heat effects of solution of diethylenetriamino-N,N,N′,N″,N″-pentaacetic acid (H5dtpa) in water and solutions of potassium hydroxide were determined at 298.15 K by direct calorimetry. The standard enthalpies of formation of H5dtpa and its dissociation products were calculated.

Thermodynamics of complexation of lead(II) and cobalt(II) with N-(carboxymethyl)aspartic acid in aqueous solutions

The enthalpies of complexation of lead(II) and cobalt(II) with N-(carboxymethyl)aspartic acid (H3Y) were determined calorimetrically at 298.15 K within a wide ionic strength range (KNO3). The thermodynamic characteristics of formation of the CoY2- and PbY2− complexes were calculated at non-zero and zero ionic strengthes. The explanation of the obtained values is given.

The thermodynamic characteristics of complex formation of Cd2+ with N,N-Bis(carboxymethyl)aspartic acid in aqueous solutions at 298.15 K

The equilibrium constants and heats of formation of complexes of N,N-bis(carboxymethyl)aspartic acid (H4Y) with Cd2+ ions at 298.15 K and ionic strengths of 0.2, 0.5, and 1.0 (KNO3) were determined by potentiometric titration and calorimetrically. The thermodynamic characteristics of formation of the CdY2− complex at fixed and zero ionic strength values were calculated. The values obtained were interpreted.