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

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

“…The most reliable stability constants of cobalt(II) and lead(II) CMAA complexes are given in [4,5], and the con stants of protolytic equilibria in CMAA solutions and the heats of acid-base interactions are found in [6] and [7], respectively. In these works, the results were obtained at several concentration ratios and ionic strengthes and processed with consideration for maxi mally possible processes, such as the dissociation of a complexone, the hydrolysis of a metal, and the com There are no literature data on the enthalpies and entropies of complexation of Pb 2+ and Co 2+ with CMAA, and this imposes some difficulties on thermo dynamic and other calculations.…”

“…The parameters necessary for calculation, such as the enthalpies and constants of acid-base interaction and complexation in a CMAA solution and the ther CoY modynamic parameters of dissociation of water, were taken from [7], [4], and [11], respectively; and the hydrolysis of a metal was taken into account using the data [12]. The enthalpy change in process (6) at zero ionic strength was calculated by the equation with a single individual parameter [13].…”

The thermodynamic characteristics of the formation of Al3+ ion complexes with iminodisuccinic acid in aqueous solutions

“…Earlier, H 4 L complexes with alkaline earth, rare earth [1] and several 3d transition metals were studied [2][3][4][5][6][7][8]. There are no literature data about Аl 3+ com plexes with H 4 L. In this work, we used potentiometric titration to study complex formation between Аl 3+ and H 4 L over a wide pH range at various ionic strengths in a KNO 3 medium at 298.2 K. EXPERIMENTAL Iminodisuccinic acid (H 4 L) was synthesized by the condensation of aspartic and maleic acids.…”

Stability constants of the complexes of ethylenediamine-N,N′-diglutaric acid with zinc, cadmium, cobalt, and manganese(II) ions

“…We have previously studied complexation of some d metal ions (Mn 2+ , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ , and Cd 2+ ) with trimethylenediamine N,N,N',N' tetraace tic acid [2][3][4][5][6], 2 hydroxypropylene 1,3 diamine-N,N,N',N' tetraacetic acid [7][8][9][10][11][12][13][14], and ethylenedi amine N,N' disuccinic acid [15][16][17][18][19] and determined the standard thermodynamic parameters (logK°, Δ r G°, Δ r H°, and Δ r S°) of these reactions. Ethylenedi amine N,N' diglutaric acid (EDDG, H 4 L) was the object of this study:…”