E. V. Kozlovskii

Thermodynamics of mixed-ligand complexation of mercury(II) ethylenediaminetetraacetate with histidine and lysine in aqueous solution

The formation of mixed-ligand complexes HgEdtaIm2−, HgEdtaL3−, HgEdtaHL2−, and (HgEdta)2L5− (L is histidine, lysine; Im is imidazole) was studied by calorimetry, pH-metry, and NMR spectroscopy. The thermodynamic parameters (logK, ΔrG0, ΔrH, ΔrS) for the reactions of complex formation at 298.15 K and ion strength of 0.5 (KNO3) were determined. The most likely coordination mode for the complexone and amino acid in the mixed complexes was identified.

Complex formation of maleic acid with the Zn2+, Ni2+, Co2+, Cu2+ in aqueous solution

The process of complex formation of maleic acid (H2L) with the ions Zn2+, Ni2+, Co2+, Cu2+ was studied by potentiometric titration in a wide range of concentration ratios at 298 K and I = 0.1 mol/l (NaNO3). The moieties ZnL, CoL, NiL, NiL22−, CuL, and CuL22− were detected and their stability constants were determined.

Mixed-ligand complexation of iron(III) ethylenediaminetetraacetate with iminodiacetate and ethylenediamine in aqueous solution

The formation of the heteroleptic complexes FeEdtaIda3− and FeEdtaEn−(Ida2− is the iminodiacetate anion and En is ethylenediamine) was examined by direct calorimetry, pH potentiometry, and spectrophotometry at 298.15 K and the ionic strength I = 0.5 (KNO3). A possible way of coordination of the ligands in the heteroleptic complexes was discussed.

Thermochemical study of the complex formation of copper(II) and nickel(II) iminodiacetates with amino acids in aqueous solutions

The formation of mixed-ligand complexes in the M(II)–Ida–L systems (M = Cu, Ni, L = His, Orn, Lys), where Ida is the iminodiacetic acid residue, was studied by pH-metry, calorimetry, and spectrophotometry. The thermodynamic parameters (logK, ΔrG0, ΔrH, ΔrS) of formation of the complexes were determined at 298.15 K and the ionic strength I = 0.5 (KNO3). The most probable mode of coordination of the chelating agent and the amino acid in the mixed-ligand complexes was elucidated.

Mixed Complex Formation of Lead(II) and Mercury(II) Ethylenediaminetetraacetates with Thiourea in an Aqueous Solution

The formation of mixed-ligand complexes HgEdtaThio2−, HgEdtaS2O34−, PbEdtaThio2−, and Pb(Thio)i2+, i = 1, 2; Thio is thiourea) was studied by calorimetry, pH metry, and 1H and 13C NMR spectroscopy. The thermodynamic parameters (logK, ΔrG0, ΔrH, and ΔrS) for the formation of the complexes at 298.15 K and the ionic strength I = 0.5(NaClO4) were determined. The most probable coordination mode of the ligands in the mixed complex was considered.

The thermodynamic functions of formation and transfer of copper(II) and nickel(II) ethylenediaminetetraacetate complexes with ammonia in aqueous-ethanolic solutions

The formation of mixed-ligand NiEdtaNH32− and CuEdtaNH32− complexes in an aqueous-ethanolic solvent with the mole fractions of ethanol 0.1 and 0.2 at 298.15 K and ionic strength I = 0.4 (KNO3) was studied calorimetrically. The thermodynamic characteristics of formation and transfer parameters of these complexes were calculated. The influence of the mixed solvent on the thermodynamic characteristics of these reactions was studied.

Thermodynamics of mixed-ligand complexation of cerium group lanthanide ethylenediaminetetraacetates

The thermodynamic parameters (logK, ΔrG0, ΔrH, and ΔrS) for mixed-ligand complexation of LnEdta− (Ln3+ = La3+, Ce3+, Pr3+, Nd3+, Sm3+, Gd3+) with iminodiacetate and nitrilotriacetate ions in aqueous solution at 298.15 K and ionic strength I = 0.5 (KNO3) were determined by calorimetry and pH-metry. The variation of the thermodynamic parameters of the reactions over the lanthanide series was discussed.

Thermodynamics of mixed-ligand complexation of gadolinium ethylenediaminetetraacetate with amino acids in aqueous solution

Mixed-ligand complexation of GdEdta− with glycinate, L-glutamate, DL-aspartate, iminodiacetate, and nitrilotriacetate anions in aqueous solutions at 298.15 K and the ionic strength I = 0.5 (KNO3) was studied. The thermodynamic parameters (logK, ΔrG, ΔrH, ΔrS) of these reactions were determined from calorimetric and pH-metric data. The most probable way of coordination of the amino acids in the heteroleptic complexes is discussed.

The potentiometric study of maleic acid complexation with the alkaline-earth metal ions in aqueous solutions

The potentiometric titration was used to study the process of complex formation of maleic acid (H2L) with the alkaline-earth metal ions at the ionic strength 0.1 and T = 298 K. The following logarithmic stability constants of maleic acid complexes were obtained: logβMgL = 1.79 ± 0.11, logβCaL = 1.91 ± 0.05, logβSrL = 1.89 ± 0.09, logβBaL = 1.94 ± 0.10.

Thermodynamics of complex formation of Cu(II) ethylenediaminetetraacetate with ethylenediamine in aqueous solution

The formation of mixed-ligand complexes in the system Cu2+-Edta4−-En was studied by the calorimetric and pH-potentiometric methods at 298.15 K and I = 0.5(KNO3). The thermodynamic characteristic of the CuEdtaEn2− complex formation were determined.